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Commit a5923aa6 authored by Heinrich Lee Yu's avatar Heinrich Lee Yu
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Revert "Merge branch 'ajk-relative-positioning-improvements' into 'master'" 

This reverts merge request !37724
parent 3807fcbf
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.rubocop_todo.yml
View file @ a5923aa6
......@@ -1323,6 +1323,7 @@ Rails/SaveBang:
- 'spec/support/shared_examples/models/members_notifications_shared_example.rb'
- 'spec/support/shared_examples/models/mentionable_shared_examples.rb'
- 'spec/support/shared_examples/models/project_latest_successful_build_for_shared_examples.rb'
- 'spec/support/shared_examples/models/relative_positioning_shared_examples.rb'
- 'spec/support/shared_examples/models/slack_mattermost_notifications_shared_examples.rb'
- 'spec/support/shared_examples/models/update_project_statistics_shared_examples.rb'
- 'spec/support/shared_examples/models/with_uploads_shared_examples.rb'
......
app/models/concerns/relative_positioning.rb
View file @ a5923aa6
......@@ -3,15 +3,11 @@
# This module makes it possible to handle items as a list, where the order of items can be easily altered
# Requirements:
#
# The model must have the following named columns:
# - id: integer
# - relative_position: integer
# - Only works for ActiveRecord models
# - relative_position integer field must present on the model
# - This module uses GROUP BY: the model should have a parent relation, example: project -> issues, project is the parent relation (issues table has a parent_id column)
#
# The model must support a concept of siblings via a child->parent relationship,
# to enable rebalancing and `GROUP BY` in queries.
# - example: project -> issues, project is the parent relation (issues table has a parent_id column)
#
# Two class methods must be defined when including this concern:
# Setup like this in the body of your class:
#
# include RelativePositioning
#
......@@ -28,162 +24,66 @@
module RelativePositioning
extend ActiveSupport::Concern
STEPS = 10
IDEAL_DISTANCE = 2**(STEPS - 1) + 1
MIN_POSITION = Gitlab::Database::MIN_INT_VALUE
START_POSITION = 0
MIN_POSITION = 0
START_POSITION = Gitlab::Database::MAX_INT_VALUE / 2
MAX_POSITION = Gitlab::Database::MAX_INT_VALUE
MAX_GAP = IDEAL_DISTANCE * 2
MIN_GAP = 2
NoSpaceLeft = Class.new(StandardError)
IDEAL_DISTANCE = 500
class_methods do
def move_nulls_to_end(objects)
move_nulls(objects, at_end: true)
objects = objects.reject(&:relative_position)
return if objects.empty?
self.transaction do
max_relative_position = objects.first.max_relative_position
objects.each do |object|
relative_position = position_between(max_relative_position || START_POSITION, MAX_POSITION)
object.update_column(:relative_position, relative_position)
max_relative_position = relative_position
end
end
end
def move_nulls_to_start(objects)
move_nulls(objects, at_end: false)
objects = objects.reject(&:relative_position)
return if objects.empty?
self.transaction do
min_relative_position = objects.first.min_relative_position
objects.reverse_each do |object|
relative_position = position_between(MIN_POSITION, min_relative_position || START_POSITION)
object.update_column(:relative_position, relative_position)
min_relative_position = relative_position
end
end
end
# This method takes two integer values (positions) and
# calculates the position between them. The range is huge as
# the maximum integer value is 2147483647.
#
# We avoid open ranges by clamping the range to [MIN_POSITION, MAX_POSITION].
#
# Then we handle one of three cases:
# - If the gap is too small, we raise NoSpaceLeft
# - If the gap is larger than MAX_GAP, we place the new position at most
# IDEAL_DISTANCE from the edge of the gap.
# - otherwise we place the new position at the midpoint.
#
# The new position will always satisfy: pos_before <= midpoint <= pos_after
#
# As a precondition, the gap between pos_before and pos_after MUST be >= 2.
# If the gap is too small, NoSpaceLeft is raised.
#
# This class method should only be called by instance methods of this module, which
# include handling for minimum gap size.
#
# @raises NoSpaceLeft
# @api private
# the maximum integer value is 2147483647. We are incrementing position by IDEAL_DISTANCE * 2 every time
# when we have enough space. If distance is less than IDEAL_DISTANCE, we are calculating an average number.
def position_between(pos_before, pos_after)
pos_before ||= MIN_POSITION
pos_after ||= MAX_POSITION
pos_before, pos_after = [pos_before, pos_after].sort
gap_width = pos_after - pos_before
midpoint = [pos_after - 1, pos_before + (gap_width / 2)].min
halfway = (pos_after + pos_before) / 2
distance_to_halfway = pos_after - halfway
if gap_width < MIN_GAP
raise NoSpaceLeft
elsif gap_width > MAX_GAP
if distance_to_halfway < IDEAL_DISTANCE
halfway
else
if pos_before == MIN_POSITION
pos_after - IDEAL_DISTANCE
elsif pos_after == MAX_POSITION
pos_before + IDEAL_DISTANCE
else
midpoint
end
else
midpoint
end
end
private
# @api private
def gap_size(object, gaps:, at_end:, starting_from:)
total_width = IDEAL_DISTANCE * gaps
size = if at_end && starting_from + total_width >= MAX_POSITION
(MAX_POSITION - starting_from) / gaps
elsif !at_end && starting_from - total_width <= MIN_POSITION
(starting_from - MIN_POSITION) / gaps
else
IDEAL_DISTANCE
end
# Shift max elements leftwards if there isn't enough space
return [size, starting_from] if size >= MIN_GAP
order = at_end ? :desc : :asc
terminus = object
.send(:relative_siblings) # rubocop:disable GitlabSecurity/PublicSend
.where('relative_position IS NOT NULL')
.order(relative_position: order)
.first
if at_end
terminus.move_sequence_before(true)
max_relative_position = terminus.reset.relative_position
[[(MAX_POSITION - max_relative_position) / gaps, IDEAL_DISTANCE].min, max_relative_position]
else
terminus.move_sequence_after(true)
min_relative_position = terminus.reset.relative_position
[[(min_relative_position - MIN_POSITION) / gaps, IDEAL_DISTANCE].min, min_relative_position]
end
end
# @api private
# @param [Array<RelativePositioning>] objects The objects to give positions to. The relative
# order will be preserved (i.e. when this method returns,
# objects.first.relative_position < objects.last.relative_position)
# @param [Boolean] at_end: The placement.
# If `true`, then all objects with `null` positions are placed _after_
# all siblings with positions. If `false`, all objects with `null`
# positions are placed _before_ all siblings with positions.
def move_nulls(objects, at_end:)
objects = objects.reject(&:relative_position)
return if objects.empty?
representative = objects.first
number_of_gaps = objects.size + 1 # 1 at left, one between each, and one at right
position = if at_end
representative.max_relative_position
else
representative.min_relative_position
end
position ||= START_POSITION # If there are no positioned siblings, start from START_POSITION
gap, position = gap_size(representative, gaps: number_of_gaps, at_end: at_end, starting_from: position)
# Raise if we could not make enough space
raise NoSpaceLeft if gap < MIN_GAP
indexed = objects.each_with_index.to_a
starting_from = at_end ? position : position - (gap * number_of_gaps)
# Some classes are polymorphic, and not all siblings are in the same table.
by_model = indexed.group_by { |pair| pair.first.class }
by_model.each do |model, pairs|
model.transaction do
pairs.each_slice(100) do |batch|
# These are known to be integers, one from the DB, and the other
# calculated by us, and thus safe to interpolate
values = batch.map do |obj, i|
pos = starting_from + gap * (i + 1)
obj.relative_position = pos
"(#{obj.id}, #{pos})"
end.join(', ')
model.connection.exec_query(<<~SQL, "UPDATE #{model.table_name} positions")
WITH cte(cte_id, new_pos) AS (
SELECT *
FROM (VALUES #{values}) as t (id, pos)
)
UPDATE #{model.table_name}
SET relative_position = cte.new_pos
FROM cte
WHERE cte_id = id
SQL
end
halfway
end
end
end
......@@ -197,12 +97,11 @@ module RelativePositioning
calculate_relative_position('MAX', &block)
end
def prev_relative_position(ignoring: nil)
def prev_relative_position
prev_pos = nil
if self.relative_position
prev_pos = max_relative_position do |relation|
relation = relation.id_not_in(ignoring.id) if ignoring.present?
relation.where('relative_position < ?', self.relative_position)
end
end
......@@ -210,12 +109,11 @@ module RelativePositioning
prev_pos
end
def next_relative_position(ignoring: nil)
def next_relative_position
next_pos = nil
if self.relative_position
next_pos = min_relative_position do |relation|
relation = relation.id_not_in(ignoring.id) if ignoring.present?
relation.where('relative_position > ?', self.relative_position)
end
end
......@@ -227,44 +125,24 @@ module RelativePositioning
return move_after(before) unless after
return move_before(after) unless before
# If there is no place to insert an item we need to create one by moving the item
# before this and all preceding items until there is a gap
before, after = after, before if after.relative_position < before.relative_position
pos_left = before.relative_position
pos_right = after.relative_position
if pos_right - pos_left < MIN_GAP
# Not enough room! Make space by shifting all previous elements to the left
# if there is enough space, else to the right
gap = after.send(:find_next_gap_before) # rubocop:disable GitlabSecurity/PublicSend
if gap.present?
after.move_sequence_before(next_gap: gap)
pos_left -= optimum_delta_for_gap(gap)
else
before.move_sequence_after
pos_right = after.reset.relative_position
end
if (after.relative_position - before.relative_position) < 2
after.move_sequence_before
before.reset
end
new_position = self.class.position_between(pos_left, pos_right)
self.relative_position = new_position
self.relative_position = self.class.position_between(before.relative_position, after.relative_position)
end
def move_after(before = self)
pos_before = before.relative_position
pos_after = before.next_relative_position(ignoring: self)
if pos_before == MAX_POSITION || gap_too_small?(pos_after, pos_before)
gap = before.send(:find_next_gap_after) # rubocop:disable GitlabSecurity/PublicSend
pos_after = before.next_relative_position
if gap.nil?
before.move_sequence_before(true)
pos_before = before.reset.relative_position
else
before.move_sequence_after(next_gap: gap)
pos_after += optimum_delta_for_gap(gap)
end
if pos_after && (pos_after - pos_before) < 2
before.move_sequence_after
pos_after = before.next_relative_position
end
self.relative_position = self.class.position_between(pos_before, pos_after)
......@@ -272,168 +150,80 @@ module RelativePositioning
def move_before(after = self)
pos_after = after.relative_position
pos_before = after.prev_relative_position(ignoring: self)
pos_before = after.prev_relative_position
if pos_after == MIN_POSITION || gap_too_small?(pos_before, pos_after)
gap = after.send(:find_next_gap_before) # rubocop:disable GitlabSecurity/PublicSend
if gap.nil?
after.move_sequence_after(true)
pos_after = after.reset.relative_position
else
after.move_sequence_before(next_gap: gap)
pos_before -= optimum_delta_for_gap(gap)
end
if pos_before && (pos_after - pos_before) < 2
after.move_sequence_before
pos_before = after.prev_relative_position
end
self.relative_position = self.class.position_between(pos_before, pos_after)
end
def move_to_end
max_pos = max_relative_position
self.relative_position = max_pos.nil? ? START_POSITION : self.class.position_between(max_pos, MAX_POSITION)
self.relative_position = self.class.position_between(max_relative_position || START_POSITION, MAX_POSITION)
end
def move_to_start
min_pos = max_relative_position
self.relative_position = min_pos.nil? ? START_POSITION : self.class.position_between(MIN_POSITION, min_pos)
self.relative_position = self.class.position_between(min_relative_position || START_POSITION, MIN_POSITION)
end
# Moves the sequence before the current item to the middle of the next gap
# For example, we have
#
# 5 . . . . . 11 12 13 14 [15] 16 . 17
# -----------
#
# This moves the sequence [11 12 13 14] to [8 9 10 11], so we have:
#
# 5 . . 8 9 10 11 . . . [15] 16 . 17
# ---------
#
# Creating a gap to the left of the current item. We can understand this as
# dividing the 5 spaces between 5 and 11 into two smaller gaps of 2 and 3.
#
# If `include_self` is true, the current item will also be moved, creating a
# gap to the right of the current item:
#
# 5 . . 8 9 10 11 [14] . . . 16 . 17
# --------------
#
# As an optimization, the gap can be precalculated and passed to this method.
#
# @api private
# @raises NoSpaceLeft if the sequence cannot be moved
def move_sequence_before(include_self = false, next_gap: find_next_gap_before)
raise NoSpaceLeft unless next_gap.present?
# For example, we have 5 11 12 13 14 15 and the current item is 15
# This moves the sequence 11 12 13 14 to 8 9 10 11
def move_sequence_before
next_gap = find_next_gap_before
delta = optimum_delta_for_gap(next_gap)
move_sequence(next_gap[:start], relative_position, -delta, include_self)
move_sequence(next_gap[:start], relative_position, -delta)
end
# Moves the sequence after the current item to the middle of the next gap
# For example, we have:
#
# 8 . 10 [11] 12 13 14 15 . . . . . 21
# -----------
#
# This moves the sequence [12 13 14 15] to [15 16 17 18], so we have:
#
# 8 . 10 [11] . . . 15 16 17 18 . . 21
# -----------
#
# Creating a gap to the right of the current item. We can understand this as
# dividing the 5 spaces between 15 and 21 into two smaller gaps of 3 and 2.
#
# If `include_self` is true, the current item will also be moved, creating a
# gap to the left of the current item:
#
# 8 . 10 . . . [14] 15 16 17 18 . . 21
# ----------------
#
# As an optimization, the gap can be precalculated and passed to this method.
#
# @api private
# @raises NoSpaceLeft if the sequence cannot be moved
def move_sequence_after(include_self = false, next_gap: find_next_gap_after)
raise NoSpaceLeft unless next_gap.present?
# For example, we have 11 12 13 14 15 21 and the current item is 11
# This moves the sequence 12 13 14 15 to 15 16 17 18
def move_sequence_after
next_gap = find_next_gap_after
delta = optimum_delta_for_gap(next_gap)
move_sequence(relative_position, next_gap[:start], delta, include_self)
move_sequence(relative_position, next_gap[:start], delta)
end
private
def gap_too_small?(pos_a, pos_b)
return false unless pos_a && pos_b
(pos_a - pos_b).abs < MIN_GAP
end
# Find the first suitable gap to the left of the current position.
#
# Satisfies the relations:
# - gap[:start] <= relative_position
# - abs(gap[:start] - gap[:end]) >= MIN_GAP
# - MIN_POSITION <= gap[:start] <= MAX_POSITION
# - MIN_POSITION <= gap[:end] <= MAX_POSITION
#
# Supposing that the current item is 13, and we have a sequence of items:
#
# 1 . . . 5 . . . . 11 12 [13] 14 . . 17
# ^---------^
#
# Then we return: `{ start: 11, end: 5 }`
#
# Here start refers to the end of the gap closest to the current item.
# Supposing that we have a sequence of items: 1 5 11 12 13 and the current item is 13
# This would return: `{ start: 11, end: 5 }`
def find_next_gap_before
items_with_next_pos = scoped_items
.select('relative_position AS pos, LEAD(relative_position) OVER (ORDER BY relative_position DESC) AS next_pos')
.where('relative_position <= ?', relative_position)
.order(relative_position: :desc)
find_next_gap(items_with_next_pos, MIN_POSITION)
find_next_gap(items_with_next_pos).tap do |gap|
gap[:end] ||= MIN_POSITION
end
end
# Find the first suitable gap to the right of the current position.
#
# Satisfies the relations:
# - gap[:start] >= relative_position
# - abs(gap[:start] - gap[:end]) >= MIN_GAP
# - MIN_POSITION <= gap[:start] <= MAX_POSITION
# - MIN_POSITION <= gap[:end] <= MAX_POSITION
#
# Supposing the current item is 13, and that we have a sequence of items:
#
# 9 . . . [13] 14 15 . . . . 20 . . . 24
# ^---------^
#
# Then we return: `{ start: 15, end: 20 }`
#
# Here start refers to the end of the gap closest to the current item.
# Supposing that we have a sequence of items: 13 14 15 20 24 and the current item is 13
# This would return: `{ start: 15, end: 20 }`
def find_next_gap_after
items_with_next_pos = scoped_items
.select('relative_position AS pos, LEAD(relative_position) OVER (ORDER BY relative_position ASC) AS next_pos')
.where('relative_position >= ?', relative_position)
.order(:relative_position)
find_next_gap(items_with_next_pos, MAX_POSITION)
find_next_gap(items_with_next_pos).tap do |gap|
gap[:end] ||= MAX_POSITION
end
end
def find_next_gap(items_with_next_pos, end_is_nil)
gap = self.class
.from(items_with_next_pos, :items)
.where('next_pos IS NULL OR ABS(pos::bigint - next_pos::bigint) >= ?', MIN_GAP)
.limit(1)
.pluck(:pos, :next_pos)
.first
def find_next_gap(items_with_next_pos)
gap = self.class.from(items_with_next_pos, :items_with_next_pos)
.where('ABS(pos - next_pos) > 1 OR next_pos IS NULL')
.limit(1)
.pluck(:pos, :next_pos)
.first
return if gap.nil? || gap.first == end_is_nil
{ start: gap.first, end: gap.second || end_is_nil }
{ start: gap[0], end: gap[1] }
end
def optimum_delta_for_gap(gap)
......@@ -442,10 +232,9 @@ module RelativePositioning
[delta, IDEAL_DISTANCE].min
end
def move_sequence(start_pos, end_pos, delta, include_self = false)
relation = include_self ? scoped_items : relative_siblings
relation
def move_sequence(start_pos, end_pos, delta)
scoped_items
.where.not(id: self.id)
.where('relative_position BETWEEN ? AND ?', start_pos, end_pos)
.update_all("relative_position = relative_position + #{delta}")
end
......@@ -466,10 +255,6 @@ module RelativePositioning
.first&.last
end
def relative_siblings(relation = scoped_items)
relation.id_not_in(id)
end
def scoped_items
self.class.relative_positioning_query_base(self)
end
......
changelogs/unreleased/ajk-relative-positioning-improvements.yml deleted 100644 → 0
View file @ 3807fcbf
---
title: Performance and robustness improvements for relative positioning
merge_request: 37724
author:
type: performance
ee/app/models/concerns/epic_tree_sorting.rb
View file @ a5923aa6
......@@ -8,8 +8,8 @@ module EpicTreeSorting
class_methods do
def relative_positioning_query_base(object)
from_union([
EpicIssue.select("id, relative_position, epic_id as parent_id, epic_id, 'epic_issue' as object_type").in_epic(object.parent_ids),
Epic.select("id, relative_position, parent_id, parent_id as epic_id, 'epic' as object_type").where(parent_id: object.parent_ids)
EpicIssue.select("id, relative_position, epic_id, 'epic_issue' as object_type").in_epic(object.parent_ids),
Epic.select("id, relative_position, parent_id as epic_id, 'epic' as object_type").where(parent_id: object.parent_ids)
])
end
......@@ -19,14 +19,11 @@ module EpicTreeSorting
end
included do
def move_sequence(start_pos, end_pos, delta, include_self = false)
def move_sequence(start_pos, end_pos, delta)
items_to_update = scoped_items
.select(:id, :object_type)
.where('relative_position BETWEEN ? AND ?', start_pos, end_pos)
unless include_self
items_to_update = items_to_update.where.not('object_type = ? AND id = ?', self.class.table_name.singularize, self.id)
end
.where.not('object_type = ? AND id = ?', self.class.table_name.singularize, self.id)
items_to_update.group_by { |item| item.object_type }.each do |type, group_items|
ids = group_items.map(&:id)
......
ee/spec/models/epic_issue_spec.rb
View file @ a5923aa6
......@@ -28,49 +28,9 @@ RSpec.describe EpicIssue do
context "relative positioning" do
it_behaves_like "a class that supports relative positioning" do
let_it_be(:epic) { create(:epic) }
let(:epic) { create(:epic) }
let(:factory) { :epic_issue }
let(:default_params) { { epic: epic } }
end
context 'with a mixed tree level' do
let_it_be(:epic) { create(:epic) }
let_it_be_with_reload(:left) { create(:epic_issue, epic: epic, relative_position: 100) }
let_it_be_with_reload(:middle) { create(:epic, group: epic.group, parent: epic, relative_position: 101) }
let_it_be_with_reload(:right) { create(:epic_issue, epic: epic, relative_position: 102) }
it 'can create space by using move_sequence_after' do
left.move_sequence_after
[left, middle, right].each(&:reset)
expect(middle.relative_position - left.relative_position).to be > 1
expect(left.relative_position).to be < middle.relative_position
expect(middle.relative_position).to be < right.relative_position
end
it 'can create space by using move_sequence_before' do
right.move_sequence_before
[left, middle, right].each(&:reset)
expect(right.relative_position - middle.relative_position).to be > 1
expect(left.relative_position).to be < middle.relative_position
expect(middle.relative_position).to be < right.relative_position
end
it 'moves nulls to the end' do
leaves = create_list(:epic_issue, 2, epic: epic, relative_position: nil)
nested = create(:epic, group: epic.group, parent: epic, relative_position: nil)
moved = [*leaves, nested]
level = [nested, *leaves, right]
expect do
EpicIssue.move_nulls_to_end(level)
end.not_to change { right.reset.relative_position }
moved.each(&:reset)
expect(moved.map(&:relative_position)).to all(be > right.relative_position)
end
end
end
end
ee/spec/models/epic_spec.rb
View file @ a5923aa6
......@@ -616,19 +616,9 @@ RSpec.describe Epic do
end
context "relative positioning" do
context 'there is no parent' do
it_behaves_like "a class that supports relative positioning" do
let(:factory) { :epic }
let(:default_params) { {} }
end
end
context 'there is a parent' do
it_behaves_like "a class that supports relative positioning" do
let_it_be(:parent) { create(:epic) }
let(:factory) { :epic }
let(:default_params) { { parent: parent, group: parent.group } }
end
it_behaves_like "a class that supports relative positioning" do
let(:factory) { :epic }
let(:default_params) { {} }
end
end
......
ee/spec/models/issue_spec.rb
View file @ a5923aa6
......@@ -454,14 +454,20 @@ RSpec.describe Issue do
end
describe 'relative positioning with group boards' do
let_it_be(:group) { create(:group) }
let_it_be(:board) { create(:board, group: group) }
let_it_be(:project) { create(:project, namespace: group) }
let_it_be(:project1) { create(:project, namespace: group) }
let_it_be_with_reload(:issue) { create(:issue, project: project) }
let_it_be_with_reload(:issue1) { create(:issue, project: project1, relative_position: issue.relative_position + RelativePositioning::IDEAL_DISTANCE) }
let(:group) { create(:group) }
let!(:board) { create(:board, group: group) }
let(:project) { create(:project, namespace: group) }
let(:project1) { create(:project, namespace: group) }
let(:issue) { build(:issue, project: project) }
let(:issue1) { build(:issue, project: project1) }
let(:new_issue) { build(:issue, project: project1, relative_position: nil) }
before do
[issue, issue1].each do |issue|
issue.move_to_end && issue.save
end
end
describe '#max_relative_position' do
it 'returns maximum position' do
expect(issue.max_relative_position).to eq issue1.relative_position
......@@ -540,20 +546,18 @@ RSpec.describe Issue do
issue1.update relative_position: issue.relative_position
new_issue.move_between(issue, issue1)
[issue, issue1].each(&:reset)
expect(new_issue.relative_position)
.to be_between(issue.relative_position, issue1.relative_position).exclusive
expect(new_issue.relative_position).to be > issue.relative_position
expect(issue.relative_position).to be < issue1.relative_position
end
it 'positions issues between other two if distance is 1' do
issue1.update relative_position: issue.relative_position + 1
new_issue.move_between(issue, issue1)
[issue, issue1].each(&:reset)
expect(new_issue.relative_position)
.to be_between(issue.relative_position, issue1.relative_position).exclusive
expect(new_issue.relative_position).to be > issue.relative_position
expect(issue.relative_position).to be < issue1.relative_position
end
it 'positions issue in the middle of other two if distance is big enough' do
......@@ -562,20 +566,24 @@ RSpec.describe Issue do
new_issue.move_between(issue, issue1)
expect(new_issue.relative_position)
.to be_between(issue.relative_position, issue1.relative_position).exclusive
expect(new_issue.relative_position).to eq(8000)
end
it 'positions issue closer to the middle if we are at the very top' do
new_issue.move_between(nil, issue)
issue1.update relative_position: 6000
expect(new_issue.relative_position).to eq(issue.relative_position - RelativePositioning::IDEAL_DISTANCE)
new_issue.move_between(nil, issue1)
expect(new_issue.relative_position).to eq(6000 - RelativePositioning::IDEAL_DISTANCE)
end
it 'positions issue closer to the middle if we are at the very bottom' do
new_issue.move_between(issue1, nil)
issue.update relative_position: 6000
issue1.update relative_position: nil
new_issue.move_between(issue, nil)
expect(new_issue.relative_position).to eq(issue1.relative_position + RelativePositioning::IDEAL_DISTANCE)
expect(new_issue.relative_position).to eq(6000 + RelativePositioning::IDEAL_DISTANCE)
end
it 'positions issue in the middle of other two if distance is not big enough' do
......@@ -592,10 +600,8 @@ RSpec.describe Issue do
issue1.update relative_position: 101
new_issue.move_between(issue, issue1)
[issue, issue1].each(&:reset)
expect(new_issue.relative_position)
.to be_between(issue.relative_position, issue1.relative_position).exclusive
expect(new_issue.relative_position).to be_between(issue.relative_position, issue1.relative_position)
end
it 'uses rebalancing if there is no place' do
......@@ -606,15 +612,12 @@ RSpec.describe Issue do
new_issue.move_between(issue1, issue2)
new_issue.save!
[issue, issue1, issue2].each(&:reset)
expect(new_issue.relative_position)
.to be_between(issue1.relative_position, issue2.relative_position).exclusive
expect([issue, issue1, issue2, new_issue].map(&:relative_position).uniq).to have_attributes(size: 4)
expect(new_issue.relative_position).to be_between(issue1.relative_position, issue2.relative_position)
expect(issue.reload.relative_position).not_to eq(100)
end
it 'positions issue right if we pass non-sequential parameters' do
it 'positions issue right if we pass none-sequential parameters' do
issue.update relative_position: 99
issue1.update relative_position: 101
issue2 = create(:issue, relative_position: 102, project: project)
......
ee/spec/services/epic_issues/create_service_spec.rb
View file @ a5923aa6
......@@ -169,9 +169,7 @@ RSpec.describe EpicIssues::CreateService do
end
context 'when multiple valid issues are given' do
let(:references) { [issue, issue2].map { |i| i.to_reference(full: true) } }
subject { assign_issue(references) }
subject { assign_issue([issue.to_reference(full: true), issue2.to_reference(full: true)]) }
let(:created_link1) { EpicIssue.find_by!(issue_id: issue.id) }
let(:created_link2) { EpicIssue.find_by!(issue_id: issue2.id) }
......@@ -183,18 +181,13 @@ RSpec.describe EpicIssues::CreateService do
expect(created_link2).to have_attributes(epic: epic)
end
it 'places each issue at the start' do
subject
expect(created_link2.relative_position).to be < created_link1.relative_position
end
it 'orders the epic issues to the first place and moves the existing ones down' do
existing_link = create(:epic_issue, epic: epic, issue: issue3)
subject
expect([created_link1, created_link2].map(&:relative_position))
.to all(be < existing_link.reset.relative_position)
expect(created_link2.relative_position).to be < created_link1.relative_position
expect(created_link1.relative_position).to be < existing_link.reload.relative_position
end
it 'returns success status' do
......
lib/gitlab/database.rb
View file @ a5923aa6
......@@ -22,7 +22,6 @@ module Gitlab
# https://www.postgresql.org/docs/9.2/static/datatype-numeric.html
MAX_INT_VALUE = 2147483647
MIN_INT_VALUE = -2147483648
# The max value between MySQL's TIMESTAMP and PostgreSQL's timestampz:
# https://www.postgresql.org/docs/9.1/static/datatype-datetime.html
......
spec/features/boards/issue_ordering_spec.rb
View file @ a5923aa6
......@@ -21,7 +21,7 @@ RSpec.describe 'Issue Boards', :js do
end
context 'un-ordered issues' do
let!(:issue4) { create(:labeled_issue, project: project, labels: [label], relative_position: nil) }
let!(:issue4) { create(:labeled_issue, project: project, labels: [label]) }
before do
visit project_board_path(project, board)
......
spec/models/analytics/cycle_analytics/project_stage_spec.rb
View file @ a5923aa6
......@@ -23,7 +23,7 @@ RSpec.describe Analytics::CycleAnalytics::ProjectStage do
context 'relative positioning' do
it_behaves_like 'a class that supports relative positioning' do
let_it_be(:project) { create(:project) }
let(:project) { build(:project) }
let(:factory) { :cycle_analytics_project_stage }
let(:default_params) { { project: project } }
end
......
spec/models/issue_spec.rb
View file @ a5923aa6
......@@ -6,7 +6,6 @@ RSpec.describe Issue do
include ExternalAuthorizationServiceHelpers
let_it_be(:user) { create(:user) }
let_it_be(:reusable_project) { create(:project) }
describe "Associations" do
it { is_expected.to belong_to(:milestone) }
......@@ -146,13 +145,13 @@ RSpec.describe Issue do
end
describe '#order_by_position_and_priority' do
let(:project) { reusable_project }
let(:project) { create :project }
let(:p1) { create(:label, title: 'P1', project: project, priority: 1) }
let(:p2) { create(:label, title: 'P2', project: project, priority: 2) }
let!(:issue1) { create(:labeled_issue, project: project, labels: [p1]) }
let!(:issue2) { create(:labeled_issue, project: project, labels: [p2]) }
let!(:issue3) { create(:issue, project: project, relative_position: -200) }
let!(:issue4) { create(:issue, project: project, relative_position: -100) }
let!(:issue3) { create(:issue, project: project, relative_position: 100) }
let!(:issue4) { create(:issue, project: project, relative_position: 200) }
it 'returns ordered list' do
expect(project.issues.order_by_position_and_priority)
......@@ -161,10 +160,10 @@ RSpec.describe Issue do
end
describe '#sort' do
let(:project) { reusable_project }
let(:project) { create(:project) }
context "by relative_position" do
let!(:issue) { create(:issue, project: project, relative_position: nil) }
let!(:issue) { create(:issue, project: project) }
let!(:issue2) { create(:issue, project: project, relative_position: 2) }
let!(:issue3) { create(:issue, project: project, relative_position: 1) }
......@@ -1028,7 +1027,7 @@ RSpec.describe Issue do
context "relative positioning" do
it_behaves_like "a class that supports relative positioning" do
let_it_be(:project) { create(:project) }
let(:project) { create(:project) }
let(:factory) { :issue }
let(:default_params) { { project: project } }
end
......
spec/support/shared_examples/models/relative_positioning_shared_examples.rb
View file @ a5923aa6
......@@ -25,6 +25,7 @@ RSpec.shared_examples 'a class that supports relative positioning' do
items = [item1, item2, item3]
described_class.move_nulls_to_end(items)
items.map(&:reload)
expect(items.sort_by(&:relative_position)).to eq(items)
expect(item1.relative_position).to be(1000)
......@@ -34,57 +35,22 @@ RSpec.shared_examples 'a class that supports relative positioning' do
expect(item3.next_relative_position).to be_nil
end
it 'preserves relative position' do
item1.update!(relative_position: nil)
item2.update!(relative_position: nil)
described_class.move_nulls_to_end([item1, item2])
expect(item1.relative_position).to be < item2.relative_position
end
it 'moves the item near the start position when there are no existing positions' do
item1.update!(relative_position: nil)
described_class.move_nulls_to_end([item1])
expect(item1.reset.relative_position).to eq(described_class::START_POSITION + described_class::IDEAL_DISTANCE)
item1.reload
expect(item1.relative_position).to eq(described_class::START_POSITION + described_class::IDEAL_DISTANCE)
end
it 'does not perform any moves if all items have their relative_position set' do
item1.update!(relative_position: 1)
expect do
described_class.move_nulls_to_end([item1])
end.not_to change { item1.reset.relative_position }
end
it 'manages to move nulls to the end even if there is a sequence at the end' do
bunch = create_items_with_positions(run_at_end)
item1.update!(relative_position: nil)
described_class.move_nulls_to_end([item1])
item1.reload
items = [*bunch, item1]
items.each(&:reset)
expect(items.map(&:relative_position)).to all(be_valid_position)
expect(items.sort_by(&:relative_position)).to eq(items)
end
it 'does not have an N+1 issue' do
create_items_with_positions(10..12)
a, b, c, d, e, f = create_items_with_positions([nil, nil, nil, nil, nil, nil])
baseline = ActiveRecord::QueryRecorder.new do
described_class.move_nulls_to_end([a, e])
end
expect { described_class.move_nulls_to_end([b, c, d]) }
.not_to exceed_query_limit(baseline)
expect { described_class.move_nulls_to_end([f]) }
.not_to exceed_query_limit(baseline.count)
expect(item1.relative_position).to be(1)
end
end
......@@ -112,19 +78,11 @@ RSpec.shared_examples 'a class that supports relative positioning' do
item1.update!(relative_position: nil)
described_class.move_nulls_to_start([item1])
item1.reload
expect(item1.relative_position).to eq(described_class::START_POSITION - described_class::IDEAL_DISTANCE)
end
it 'preserves relative position' do
item1.update!(relative_position: nil)
item2.update!(relative_position: nil)
described_class.move_nulls_to_end([item1, item2])
expect(item1.relative_position).to be < item2.relative_position
end
it 'does not perform any moves if all items have their relative_position set' do
item1.update!(relative_position: 1)
......@@ -143,8 +101,8 @@ RSpec.shared_examples 'a class that supports relative positioning' do
describe '#prev_relative_position' do
it 'returns previous position if there is an item above' do
item1.update!(relative_position: 5)
item2.update!(relative_position: 15)
item1.update(relative_position: 5)
item2.update(relative_position: 15)
expect(item2.prev_relative_position).to eq item1.relative_position
end
......@@ -156,8 +114,8 @@ RSpec.shared_examples 'a class that supports relative positioning' do
describe '#next_relative_position' do
it 'returns next position if there is an item below' do
item1.update!(relative_position: 5)
item2.update!(relative_position: 15)
item1.update(relative_position: 5)
item2.update(relative_position: 15)
expect(item1.next_relative_position).to eq item2.relative_position
end
......@@ -167,172 +125,9 @@ RSpec.shared_examples 'a class that supports relative positioning' do
end
end
describe '#find_next_gap_before' do
context 'there is no gap' do
let(:items) { create_items_with_positions(run_at_start) }
it 'returns nil' do
items.each do |item|
expect(item.send(:find_next_gap_before)).to be_nil
end
end
end
context 'there is a sequence ending at MAX_POSITION' do
let(:items) { create_items_with_positions(run_at_end) }
let(:gaps) do
items.map { |item| item.send(:find_next_gap_before) }
end
it 'can find the gap at the start for any item in the sequence' do
gap = { start: items.first.relative_position, end: RelativePositioning::MIN_POSITION }
expect(gaps).to all(eq(gap))
end
it 'respects lower bounds' do
gap = { start: items.first.relative_position, end: 10 }
new_item.update!(relative_position: 10)
expect(gaps).to all(eq(gap))
end
end
specify do
item1.update!(relative_position: 5)
(0..10).each do |pos|
item2.update!(relative_position: pos)
gap = item2.send(:find_next_gap_before)
expect(gap[:start]).to be <= item2.relative_position
expect((gap[:end] - gap[:start]).abs).to be >= RelativePositioning::MIN_GAP
expect(gap[:start]).to be_valid_position
expect(gap[:end]).to be_valid_position
end
end
it 'deals with there not being any items to the left' do
create_items_with_positions([1, 2, 3])
new_item.update!(relative_position: 0)
expect(new_item.send(:find_next_gap_before)).to eq(start: 0, end: RelativePositioning::MIN_POSITION)
end
it 'finds the next gap to the left, skipping adjacent values' do
create_items_with_positions([1, 9, 10])
new_item.update!(relative_position: 11)
expect(new_item.send(:find_next_gap_before)).to eq(start: 9, end: 1)
end
it 'finds the next gap to the left' do
create_items_with_positions([2, 10])
new_item.update!(relative_position: 15)
expect(new_item.send(:find_next_gap_before)).to eq(start: 15, end: 10)
new_item.update!(relative_position: 11)
expect(new_item.send(:find_next_gap_before)).to eq(start: 10, end: 2)
new_item.update!(relative_position: 9)
expect(new_item.send(:find_next_gap_before)).to eq(start: 9, end: 2)
new_item.update!(relative_position: 5)
expect(new_item.send(:find_next_gap_before)).to eq(start: 5, end: 2)
end
end
describe '#find_next_gap_after' do
context 'there is no gap' do
let(:items) { create_items_with_positions(run_at_end) }
it 'returns nil' do
items.each do |item|
expect(item.send(:find_next_gap_after)).to be_nil
end
end
end
context 'there is a sequence starting at MIN_POSITION' do
let(:items) { create_items_with_positions(run_at_start) }
let(:gaps) do
items.map { |item| item.send(:find_next_gap_after) }
end
it 'can find the gap at the end for any item in the sequence' do
gap = { start: items.last.relative_position, end: RelativePositioning::MAX_POSITION }
expect(gaps).to all(eq(gap))
end
it 'respects upper bounds' do
gap = { start: items.last.relative_position, end: 10 }
new_item.update!(relative_position: 10)
expect(gaps).to all(eq(gap))
end
end
specify do
item1.update!(relative_position: 5)
(0..10).each do |pos|
item2.update!(relative_position: pos)
gap = item2.send(:find_next_gap_after)
expect(gap[:start]).to be >= item2.relative_position
expect((gap[:end] - gap[:start]).abs).to be >= RelativePositioning::MIN_GAP
expect(gap[:start]).to be_valid_position
expect(gap[:end]).to be_valid_position
end
end
it 'deals with there not being any items to the right' do
create_items_with_positions([1, 2, 3])
new_item.update!(relative_position: 5)
expect(new_item.send(:find_next_gap_after)).to eq(start: 5, end: RelativePositioning::MAX_POSITION)
end
it 'finds the next gap to the right, skipping adjacent values' do
create_items_with_positions([1, 2, 10])
new_item.update!(relative_position: 0)
expect(new_item.send(:find_next_gap_after)).to eq(start: 2, end: 10)
end
it 'finds the next gap to the right' do
create_items_with_positions([2, 10])
new_item.update!(relative_position: 0)
expect(new_item.send(:find_next_gap_after)).to eq(start: 0, end: 2)
new_item.update!(relative_position: 1)
expect(new_item.send(:find_next_gap_after)).to eq(start: 2, end: 10)
new_item.update!(relative_position: 3)
expect(new_item.send(:find_next_gap_after)).to eq(start: 3, end: 10)
new_item.update!(relative_position: 5)
expect(new_item.send(:find_next_gap_after)).to eq(start: 5, end: 10)
end
end
describe '#move_before' do
let(:item3) { create(factory, default_params) }
it 'moves item before' do
[item2, item1].each do |item|
item.move_to_end
item.save!
end
expect(item1.relative_position).to be > item2.relative_position
[item2, item1].each(&:move_to_end)
item1.move_before(item2)
......@@ -340,10 +135,12 @@ RSpec.shared_examples 'a class that supports relative positioning' do
end
context 'when there is no space' do
let(:item3) { create(factory, default_params) }
before do
item1.update!(relative_position: 1000)
item2.update!(relative_position: 1001)
item3.update!(relative_position: 1002)
item1.update(relative_position: 1000)
item2.update(relative_position: 1001)
item3.update(relative_position: 1002)
end
it 'moves items correctly' do
......@@ -352,73 +149,6 @@ RSpec.shared_examples 'a class that supports relative positioning' do
expect(item3.relative_position).to be_between(item1.reload.relative_position, item2.reload.relative_position).exclusive
end
end
it 'can move the item before an item at the start' do
item1.update!(relative_position: RelativePositioning::START_POSITION)
new_item.move_before(item1)
expect(new_item.relative_position).to be_valid_position
expect(new_item.relative_position).to be < item1.reload.relative_position
end
it 'can move the item before an item at MIN_POSITION' do
item1.update!(relative_position: RelativePositioning::MIN_POSITION)
new_item.move_before(item1)
expect(new_item.relative_position).to be >= RelativePositioning::MIN_POSITION
expect(new_item.relative_position).to be < item1.reload.relative_position
end
it 'can move the item before an item bunched up at MIN_POSITION' do
item1, item2, item3 = create_items_with_positions(run_at_start)
new_item.move_before(item3)
new_item.save!
items = [item1, item2, new_item, item3]
items.each do |item|
expect(item.reset.relative_position).to be_valid_position
end
expect(items.sort_by(&:relative_position)).to eq(items)
end
context 'leap-frogging to the left' do
before do
start = RelativePositioning::START_POSITION
item1.update!(relative_position: start - RelativePositioning::IDEAL_DISTANCE * 0)
item2.update!(relative_position: start - RelativePositioning::IDEAL_DISTANCE * 1)
item3.update!(relative_position: start - RelativePositioning::IDEAL_DISTANCE * 2)
end
let(:item3) { create(factory, default_params) }
def leap_frog(steps)
a = item1
b = item2
steps.times do |i|
a.move_before(b)
a.save!
a, b = b, a
end
end
it 'can leap-frog STEPS - 1 times before needing to rebalance' do
# This is less efficient than going right, due to the flooring of
# integer division
expect { leap_frog(RelativePositioning::STEPS - 1) }
.not_to change { item3.reload.relative_position }
end
it 'rebalances after leap-frogging STEPS times' do
expect { leap_frog(RelativePositioning::STEPS) }
.to change { item3.reload.relative_position }
end
end
end
describe '#move_after' do
......@@ -434,17 +164,9 @@ RSpec.shared_examples 'a class that supports relative positioning' do
let(:item3) { create(factory, default_params) }
before do
item1.update!(relative_position: 1000)
item2.update!(relative_position: 1001)
item3.update!(relative_position: 1002)
end
it 'can move the item after an item at MAX_POSITION' do
item1.update!(relative_position: RelativePositioning::MAX_POSITION)
new_item.move_after(item1)
expect(new_item.relative_position).to be_valid_position
expect(new_item.relative_position).to be > item1.reset.relative_position
item1.update(relative_position: 1000)
item2.update(relative_position: 1001)
item3.update(relative_position: 1002)
end
it 'moves items correctly' do
......@@ -453,53 +175,6 @@ RSpec.shared_examples 'a class that supports relative positioning' do
expect(item1.relative_position).to be_between(item2.reload.relative_position, item3.reload.relative_position).exclusive
end
end
it 'can move the item after an item bunched up at MAX_POSITION' do
item1, item2, item3 = create_items_with_positions(run_at_end)
new_item.move_after(item1)
new_item.save!
items = [item1, new_item, item2, item3]
items.each do |item|
expect(item.reset.relative_position).to be_valid_position
end
expect(items.sort_by(&:relative_position)).to eq(items)
end
context 'leap-frogging' do
before do
start = RelativePositioning::START_POSITION
item1.update!(relative_position: start + RelativePositioning::IDEAL_DISTANCE * 0)
item2.update!(relative_position: start + RelativePositioning::IDEAL_DISTANCE * 1)
item3.update!(relative_position: start + RelativePositioning::IDEAL_DISTANCE * 2)
end
let(:item3) { create(factory, default_params) }
def leap_frog(steps)
a = item1
b = item2
steps.times do |i|
a.move_after(b)
a.save!
a, b = b, a
end
end
it 'can leap-frog STEPS times before needing to rebalance' do
expect { leap_frog(RelativePositioning::STEPS) }
.not_to change { item3.reload.relative_position }
end
it 'rebalances after leap-frogging STEPS+1 times' do
expect { leap_frog(RelativePositioning::STEPS + 1) }
.to change { item3.reload.relative_position }
end
end
end
describe '#move_to_end' do
......@@ -518,17 +193,8 @@ RSpec.shared_examples 'a class that supports relative positioning' do
describe '#move_between' do
before do
[item1, item2].each do |item|
item.move_to_end && item.save!
end
end
shared_examples 'moves item between' do
it 'moves the middle item to between left and right' do
expect do
middle.move_between(left, right)
middle.save!
end.to change { between_exclusive?(left, middle, right) }.from(false).to(true)
[item1, item2].each do |item1|
item1.move_to_end && item1.save
end
end
......@@ -552,26 +218,26 @@ RSpec.shared_examples 'a class that supports relative positioning' do
end
it 'positions items even when after and before positions are the same' do
item2.update! relative_position: item1.relative_position
item2.update relative_position: item1.relative_position
new_item.move_between(item1, item2)
[item1, item2].each(&:reset)
expect(new_item.relative_position).to be > item1.relative_position
expect(item1.relative_position).to be < item2.relative_position
end
context 'the two items are next to each other' do
let(:left) { item1 }
let(:middle) { new_item }
let(:right) { create_item(relative_position: item1.relative_position + 1) }
it 'positions items between other two if distance is 1' do
item2.update relative_position: item1.relative_position + 1
it_behaves_like 'moves item between'
new_item.move_between(item1, item2)
expect(new_item.relative_position).to be > item1.relative_position
expect(item1.relative_position).to be < item2.relative_position
end
it 'positions item in the middle of other two if distance is big enough' do
item1.update! relative_position: 6000
item2.update! relative_position: 10000
item1.update relative_position: 6000
item2.update relative_position: 10000
new_item.move_between(item1, item2)
......@@ -579,8 +245,7 @@ RSpec.shared_examples 'a class that supports relative positioning' do
end
it 'positions item closer to the middle if we are at the very top' do
item1.update!(relative_position: 6001)
item2.update!(relative_position: 6000)
item2.update relative_position: 6000
new_item.move_between(nil, item2)
......@@ -588,53 +253,51 @@ RSpec.shared_examples 'a class that supports relative positioning' do
end
it 'positions item closer to the middle if we are at the very bottom' do
new_item.update!(relative_position: 1)
item1.update!(relative_position: 6000)
item2.update!(relative_position: 5999)
new_item.update relative_position: 1
item1.update relative_position: 6000
item2.destroy
new_item.move_between(item1, nil)
expect(new_item.relative_position).to eq(6000 + RelativePositioning::IDEAL_DISTANCE)
end
it 'positions item in the middle of other two' do
item1.update! relative_position: 100
item2.update! relative_position: 400
it 'positions item in the middle of other two if distance is not big enough' do
item1.update relative_position: 100
item2.update relative_position: 400
new_item.move_between(item1, item2)
expect(new_item.relative_position).to eq(250)
end
context 'there is no space' do
let(:middle) { new_item }
let(:left) { create_item(relative_position: 100) }
let(:right) { create_item(relative_position: 101) }
it 'positions item in the middle of other two is there is no place' do
item1.update relative_position: 100
item2.update relative_position: 101
it_behaves_like 'moves item between'
end
new_item.move_between(item1, item2)
context 'there is a bunch of items' do
let(:items) { create_items_with_positions(100..104) }
let(:left) { items[1] }
let(:middle) { items[3] }
let(:right) { items[2] }
expect(new_item.relative_position).to be_between(item1.relative_position, item2.relative_position).exclusive
end
it_behaves_like 'moves item between'
it 'uses rebalancing if there is no place' do
item1.update relative_position: 100
item2.update relative_position: 101
item3 = create_item(relative_position: 102)
new_item.update relative_position: 103
it 'handles bunches correctly' do
middle.move_between(left, right)
middle.save!
new_item.move_between(item2, item3)
new_item.save!
expect(items.first.reset.relative_position).to be < middle.relative_position
end
expect(new_item.relative_position).to be_between(item2.relative_position, item3.relative_position).exclusive
expect(item1.reload.relative_position).not_to eq(100)
end
it 'positions item right if we pass non-sequential parameters' do
item1.update! relative_position: 99
item2.update! relative_position: 101
it 'positions item right if we pass none-sequential parameters' do
item1.update relative_position: 99
item2.update relative_position: 101
item3 = create_item(relative_position: 102)
new_item.update! relative_position: 103
new_item.update relative_position: 103
new_item.move_between(item1, item3)
new_item.save!
......@@ -666,12 +329,6 @@ RSpec.shared_examples 'a class that supports relative positioning' do
expect(positions).to eq([90, 95, 96, 102])
end
it 'raises an error if there is no space' do
items = create_items_with_positions(run_at_start)
expect { items.last.move_sequence_before }.to raise_error(RelativePositioning::NoSpaceLeft)
end
it 'finds a gap if there are unused positions' do
items = create_items_with_positions([100, 101, 102])
......@@ -679,8 +336,7 @@ RSpec.shared_examples 'a class that supports relative positioning' do
items.last.save!
positions = items.map { |item| item.reload.relative_position }
expect(positions.last - positions.second).to be > RelativePositioning::MIN_GAP
expect(positions).to eq([50, 51, 102])
end
end
......@@ -702,33 +358,7 @@ RSpec.shared_examples 'a class that supports relative positioning' do
items.first.save!
positions = items.map { |item| item.reload.relative_position }
expect(positions.second - positions.first).to be > RelativePositioning::MIN_GAP
expect(positions).to eq([100, 601, 602])
end
it 'raises an error if there is no space' do
items = create_items_with_positions(run_at_end)
expect { items.first.move_sequence_after }.to raise_error(RelativePositioning::NoSpaceLeft)
end
end
def be_valid_position
be_between(RelativePositioning::MIN_POSITION, RelativePositioning::MAX_POSITION)
end
def between_exclusive?(left, middle, right)
a, b, c = [left, middle, right].map { |item| item.reset.relative_position }
return false if a.nil? || b.nil?
return a < b if c.nil?
a < b && b < c
end
def run_at_end(size = 3)
(RelativePositioning::MAX_POSITION - size)..RelativePositioning::MAX_POSITION
end
def run_at_start(size = 3)
(RelativePositioning::MIN_POSITION..).take(size)
end
end
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