Allow filtering by weight in issues API

doc/api/issues.md

@@ -42,6 +42,7 @@ GET /issues?my_reaction_emoji=star
 | `author_id`         | integer          | no         | Return issues created by the given user `id`. Combine with `scope=all` or `scope=assigned_to_me`. _([Introduced][ce-13004] in GitLab 9.5)_          |
 | `assignee_id`       | integer          | no         | Return issues assigned to the given user `id`. `None` returns unassigned issues. `Any` returns issues with an assignee. _([Introduced][ce-13004] in GitLab 9.5)_ |
 | `my_reaction_emoji` | string           | no         | Return issues reacted by the authenticated user by the given `emoji` _([Introduced][ce-14016] in GitLab 10.0)_                                      |
+| `weight`            | integer          | no         | Return issues with the specified `weight`. `None` returns issues with no weight assigned. `Any` returns issues with a weight assigned.              |
 | `iids[]`            | Array[integer]   | no         | Return only the issues having the given `iid`                                                                                                       |
 | `order_by`          | string           | no         | Return issues ordered by `created_at` or `updated_at` fields. Default is `created_at`                                                               |
 | `sort`              | string           | no         | Return issues sorted in `asc` or `desc` order. Default is `desc`                                                                                    |
@@ -157,6 +158,7 @@ GET /groups/:id/issues?my_reaction_emoji=star
 | `author_id`         | integer          | no         | Return issues created by the given user `id` _([Introduced][ce-13004] in GitLab 9.5)_                                         |
 | `assignee_id`       | integer          | no         | Return issues assigned to the given user `id`. `None` returns unassigned issues. `Any` returns issues with an assignee. _([Introduced][ce-13004] in GitLab 9.5)_ |
 | `my_reaction_emoji` | string           | no         | Return issues reacted by the authenticated user by the given `emoji` _([Introduced][ce-14016] in GitLab 10.0)_                |
+| `weight`            | integer          | no         | Return issues with the specified `weight`. `None` returns issues with no weight assigned. `Any` returns issues with a weight assigned. |
 | `order_by`          | string           | no         | Return issues ordered by `created_at` or `updated_at` fields. Default is `created_at`                                         |
 | `sort`              | string           | no         | Return issues sorted in `asc` or `desc` order. Default is `desc`                                                              |
 | `search`            | string           | no         | Search group issues against their `title` and `description`                                                                   |
@@ -272,6 +274,7 @@ GET /projects/:id/issues?my_reaction_emoji=star
 | `author_id`         | integer          | no         | Return issues created by the given user `id` _([Introduced][ce-13004] in GitLab 9.5)_                                         |
 | `assignee_id`       | integer          | no         | Return issues assigned to the given user `id`. `None` returns unassigned issues. `Any` returns issues with an assignee. _([Introduced][ce-13004] in GitLab 9.5)_ |
 | `my_reaction_emoji` | string           | no         | Return issues reacted by the authenticated user by the given `emoji` _([Introduced][ce-14016] in GitLab 10.0)_                |
+| `weight`            | integer          | no         | Return issues with the specified `weight`. `None` returns issues with no weight assigned. `Any` returns issues with a weight assigned. |
 | `order_by`          | string           | no         | Return issues ordered by `created_at` or `updated_at` fields. Default is `created_at`                                         |
 | `sort`              | string           | no         | Return issues sorted in `asc` or `desc` order. Default is `desc`                                                              |
 | `search`            | string           | no         | Search project issues against their `title` and `description`                                                                 |

ee/app/finders/ee/issues_finder.rb

@@ -39,11 +39,11 @@ module EE
     end
 
     def filter_by_no_weight?
-      params[:weight] == ::Issue::WEIGHT_NONE
+      params[:weight].to_s.downcase == FILTER_NONE
     end
 
     def filter_by_any_weight?
-      params[:weight] == ::Issue::WEIGHT_ANY
+      params[:weight].to_s.downcase == FILTER_ANY
     end
 
     override :by_assignee

ee/spec/requests/api/issues_spec.rb

@@ -36,6 +36,34 @@ describe API::Issues, :mailer do
         expect(response).to have_gitlab_http_status(200)
         expect(response).to match_response_schema('public_api/v4/issues', dir: 'ee')
       end
+
+      describe "filtering by weight" do
+        before do
+          issue2 = create(:issue, author: user2, project: project, weight: 5)
+          create(:issue, author: user2, project: project, weight: 1)
+          create(:issue, author: user2, project: project, weight: 3)
+        end
+
+        it 'returns issues with specific weight' do
+          get api('/issues', user), weight: 5, scope: 'all'
+
+          expect_paginated_array_response(size: 1)
+          expect(first_issue['id']).to eq(issue2.id)
+        end
+
+        it 'returns issues with no weight' do
+          get api('/issues', user), weight: 'None', scope: 'all'
+
+          expect_paginated_array_response(size: 1)
+          expect(first_issue['id']).to eq(issue.id)
+        end
+
+        it 'returns issues with any weight' do
+          get api('/issues', user), weight: 'Any', scope: 'all'
+
+          expect_paginated_array_response(size: 3)
+        end
+      end
     end
   end
 

lib/api/issues.rb

@@ -60,7 +60,7 @@ module API
       end
 
       params :issue_params_ee do
-        optional :weight, type: Integer, desc: 'The weight of the issue'
+        optional :weight, type: [Integer, String], integer_none_any: true, desc: 'The weight of the issue'
       end
 
       params :issue_params do