Add id group api sorting option

With introduction of subgroups, many groups may have the same
name and/or path, thus further sorting options are necessary.
Signed-off-by: Marko, Peter <peter.marko@siemens.com>

changelogs/unreleased/more-group-api-sorting-options.yml

+---
+title: Added id sorting option to GET groups and subgroups API
+merge_request: 19665
+author: Marko, Peter
+type: added

doc/api/groups.md

@@ -12,7 +12,7 @@ Parameters:
 | `skip_groups` | array of integers | no | Skip the group IDs passed |
 | `all_available` | boolean | no | Show all the groups you have access to (defaults to `false` for authenticated users, `true` for admin) |
 | `search` | string | no | Return the list of authorized groups matching the search criteria |
-| `order_by` | string | no | Order groups by `name` or `path`. Default is `name` |
+| `order_by` | string | no | Order groups by `name`, `path` or `id`. Default is `name` |
 | `sort` | string | no | Order groups in `asc` or `desc` order. Default is `asc` |
 | `statistics` | boolean | no | Include group statistics (admins only) |
 | `with_custom_attributes` | boolean | no | Include [custom attributes](custom_attributes.md) in response (admins only) |
@@ -96,7 +96,7 @@ Parameters:
 | `skip_groups` | array of integers | no | Skip the group IDs passed |
 | `all_available` | boolean | no | Show all the groups you have access to (defaults to `false` for authenticated users, `true` for admin) |
 | `search` | string | no | Return the list of authorized groups matching the search criteria |
-| `order_by` | string | no | Order groups by `name` or `path`. Default is `name` |
+| `order_by` | string | no | Order groups by `name`, `path` or `id`. Default is `name` |
 | `sort` | string | no | Order groups in `asc` or `desc` order. Default is `asc` |
 | `statistics` | boolean | no | Include group statistics (admins only) |
 | `with_custom_attributes` | boolean | no | Include [custom attributes](custom_attributes.md) in response (admins only) |

lib/api/groups.rb

@@ -32,7 +32,7 @@ module API
         optional :all_available, type: Boolean, desc: 'Show all group that you have access to'
         optional :search, type: String, desc: 'Search for a specific group'
         optional :owned, type: Boolean, default: false, desc: 'Limit by owned by authenticated user'
-        optional :order_by, type: String, values: %w[name path], default: 'name', desc: 'Order by name or path'
+        optional :order_by, type: String, values: %w[name path id], default: 'name', desc: 'Order by name, path or id'
         optional :sort, type: String, values: %w[asc desc], default: 'asc', desc: 'Sort by asc (ascending) or desc (descending)'
         use :pagination
       end

spec/requests/api/groups_spec.rb

@@ -138,10 +138,12 @@ describe API::Groups do
 
     context "when using sorting" do
       let(:group3) { create(:group, name: "a#{group1.name}", path: "z#{group1.path}") }
+      let(:group4) { create(:group, name: "z#{group1.name}", path: "y#{group1.path}") }
       let(:response_groups) { json_response.map { |group| group['name'] } }
 
       before do
         group3.add_owner(user1)
+        group4.add_owner(user1)
       end
 
       it "sorts by name ascending by default" do
@@ -150,7 +152,7 @@ describe API::Groups do
         expect(response).to have_gitlab_http_status(200)
         expect(response).to include_pagination_headers
         expect(json_response).to be_an Array
-        expect(response_groups).to eq([group3.name, group1.name])
+        expect(response_groups).to eq([group3.name, group1.name, group4.name])
       end
 
       it "sorts in descending order when passed" do
@@ -159,16 +161,25 @@ describe API::Groups do
         expect(response).to have_gitlab_http_status(200)
         expect(response).to include_pagination_headers
         expect(json_response).to be_an Array
-        expect(response_groups).to eq([group1.name, group3.name])
+        expect(response_groups).to eq([group4.name, group1.name, group3.name])
       end
 
-      it "sorts by the order_by param" do
+      it "sorts by path in order_by param" do
         get api("/groups", user1), order_by: "path"
 
         expect(response).to have_gitlab_http_status(200)
         expect(response).to include_pagination_headers
         expect(json_response).to be_an Array
-        expect(response_groups).to eq([group1.name, group3.name])
+        expect(response_groups).to eq([group1.name, group4.name, group3.name])
+      end
+
+      it "sorts by id in the order_by param" do
+        get api("/groups", user1), order_by: "id"
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(response_groups).to eq([group1.name, group3.name, group4.name])
       end
     end