Add SnippetStatistics model

app/models/snippet.rb

@@ -44,6 +44,7 @@ class Snippet < ApplicationRecord
   has_many :notes, as: :noteable, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
   has_many :user_mentions, class_name: "SnippetUserMention", dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
   has_one :snippet_repository, inverse_of: :snippet
+  has_one :statistics, class_name: 'SnippetStatistics'
 
   delegate :name, :email, to: :author, prefix: true, allow_nil: true
 

app/models/snippet_statistics.rb

+# frozen_string_literal: true
+
+class SnippetStatistics < ApplicationRecord
+  belongs_to :snippet
+
+  validates :snippet, presence: true
+end

changelogs/unreleased/fj-223696-add-snippet-statistics.yml

+---
+title: Add SnippetStatistics model
+merge_request: 35026
+author:
+type: added

db/migrate/20200622103836_create_snippet_statistics.rb

+# frozen_string_literal: true
+
+class CreateSnippetStatistics < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    with_lock_retries do
+      create_table :snippet_statistics, id: false do |t|
+        t.references :snippet, primary_key: true, default: nil, index: false, foreign_key: { on_delete: :cascade }
+        t.bigint :repository_size, default: 0, null: false
+        t.bigint :file_count, default: 0, null: false
+        t.bigint :commit_count, default: 0, null: false
+      end
+    end
+  end
+
+  def down
+    with_lock_retries do
+      drop_table :snippet_statistics # rubocop:disable Migration/DropTable
+    end
+  end
+end

db/structure.sql

@@ -6335,6 +6335,13 @@ CREATE TABLE public.snippet_repositories (
     disk_path character varying(80) NOT NULL
 );
 
+CREATE TABLE public.snippet_statistics (
+    snippet_id bigint NOT NULL,
+    repository_size bigint DEFAULT 0 NOT NULL,
+    file_count bigint DEFAULT 0 NOT NULL,
+    commit_count bigint DEFAULT 0 NOT NULL
+);
+
 CREATE TABLE public.snippet_user_mentions (
     id bigint NOT NULL,
     snippet_id integer NOT NULL,
@@ -9045,6 +9052,9 @@ ALTER TABLE ONLY public.smartcard_identities
 ALTER TABLE ONLY public.snippet_repositories
     ADD CONSTRAINT snippet_repositories_pkey PRIMARY KEY (snippet_id);
 
+ALTER TABLE ONLY public.snippet_statistics
+    ADD CONSTRAINT snippet_statistics_pkey PRIMARY KEY (snippet_id);
+
 ALTER TABLE ONLY public.snippet_user_mentions
     ADD CONSTRAINT snippet_user_mentions_pkey PRIMARY KEY (id);
 
@@ -12949,6 +12959,9 @@ ALTER TABLE ONLY public.protected_branch_unprotect_access_levels
 ALTER TABLE ONLY public.alert_management_alert_user_mentions
     ADD CONSTRAINT fk_rails_eb2de0cdef FOREIGN KEY (note_id) REFERENCES public.notes(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY public.snippet_statistics
+    ADD CONSTRAINT fk_rails_ebc283ccf1 FOREIGN KEY (snippet_id) REFERENCES public.snippets(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY public.ci_daily_report_results
     ADD CONSTRAINT fk_rails_ebc2931b90 FOREIGN KEY (project_id) REFERENCES public.projects(id) ON DELETE CASCADE;
 
@@ -14104,5 +14117,6 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200618105638
 20200618134223
 20200618134723
+20200622103836
 \.
 

spec/lib/gitlab/import_export/all_models.yml

@@ -97,6 +97,7 @@ snippets:
 - user_agent_detail
 - user_mentions
 - snippet_repository
+- statistics
 releases:
 - author
 - project

spec/models/snippet_spec.rb

@@ -20,6 +20,7 @@ describe Snippet do
     it { is_expected.to have_many(:award_emoji).dependent(:destroy) }
     it { is_expected.to have_many(:user_mentions).class_name("SnippetUserMention") }
     it { is_expected.to have_one(:snippet_repository) }
+    it { is_expected.to have_one(:statistics).class_name('SnippetStatistics') }
   end
 
   describe 'validation' do

spec/models/snippet_statistics_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe SnippetStatistics do
+  it { is_expected.to belong_to(:snippet) }
+  it { is_expected.to validate_presence_of(:snippet) }
+end