Sorting issues by label priority in graphQL

- support both desc and asc

app/graphql/resolvers/issues_resolver.rb

@@ -52,7 +52,7 @@ module Resolvers
 
     type Types::IssueType, null: true
 
-    NON_STABLE_CURSOR_SORTS = %i[priority_asc priority_desc].freeze
+    NON_STABLE_CURSOR_SORTS = %i[priority_asc priority_desc label_priority_asc label_priority_desc].freeze
 
     def resolve(**args)
       # The project could have been loaded in batch by `BatchLoader`.

app/graphql/types/issuable_sort_enum.rb

@@ -7,5 +7,7 @@ module Types
 
     value 'PRIORITY_ASC', 'Priority by ascending order', value: :priority_asc
     value 'PRIORITY_DESC', 'Priority by descending order', value: :priority_desc
+    value 'LABEL_PRIORITY_ASC', 'Label priority by ascending order', value: :label_priority_asc
+    value 'LABEL_PRIORITY_DESC', 'Label priority by descending order', value: :label_priority_desc
   end
 end

app/graphql/types/issue_sort_enum.rb

@@ -5,9 +5,9 @@ module Types
     graphql_name 'IssueSort'
     description 'Values for sorting issues'
 
-    value 'DUE_DATE_ASC', 'Due date by ascending order', value: 'due_date_asc'
-    value 'DUE_DATE_DESC', 'Due date by descending order', value: 'due_date_desc'
-    value 'RELATIVE_POSITION_ASC', 'Relative position by ascending order', value: 'relative_position_asc'
+    value 'DUE_DATE_ASC', 'Due date by ascending order', value: :due_date_asc
+    value 'DUE_DATE_DESC', 'Due date by descending order', value: :due_date_desc
+    value 'RELATIVE_POSITION_ASC', 'Relative position by ascending order', value: :relative_position_asc
   end
 end
 

changelogs/unreleased/sort-issues-by-label-prio.yml

+---
+title: Add sorting issues by label priority to graphQL endpoint
+merge_request: 27936
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -4593,6 +4593,16 @@ enum IssueSort {
   """
   DUE_DATE_DESC
 
+  """
+  Label priority by ascending order
+  """
+  LABEL_PRIORITY_ASC
+
+  """
+  Label priority by descending order
+  """
+  LABEL_PRIORITY_DESC
+
   """
   Priority by ascending order
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -13027,6 +13027,18 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "LABEL_PRIORITY_ASC",
+              "description": "Label priority by ascending order",
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "LABEL_PRIORITY_DESC",
+              "description": "Label priority by descending order",
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "DUE_DATE_ASC",
               "description": "Due date by ascending order",

spec/graphql/resolvers/issues_resolver_spec.rb

@@ -126,7 +126,6 @@ describe Resolvers::IssuesResolver do
 
         context 'when sorting by due date' do
           let_it_be(:project) { create(:project) }
-
           let_it_be(:due_issue1) { create(:issue, project: project, due_date: 3.days.from_now) }
           let_it_be(:due_issue2) { create(:issue, project: project, due_date: nil) }
           let_it_be(:due_issue3) { create(:issue, project: project, due_date: 2.days.ago) }
@@ -143,7 +142,6 @@ describe Resolvers::IssuesResolver do
 
         context 'when sorting by relative position' do
           let_it_be(:project) { create(:project) }
-
           let_it_be(:relative_issue1) { create(:issue, project: project, relative_position: 2000) }
           let_it_be(:relative_issue2) { create(:issue, project: project, relative_position: nil) }
           let_it_be(:relative_issue3) { create(:issue, project: project, relative_position: 1000) }
@@ -156,22 +154,40 @@ describe Resolvers::IssuesResolver do
 
         context 'when sorting by priority' do
           let_it_be(:project) { create(:project) }
-
           let_it_be(:early_milestone) { create(:milestone, project: project, due_date: 10.days.from_now) }
           let_it_be(:late_milestone) { create(:milestone, project: project, due_date: 30.days.from_now) }
-          let_it_be(:label_1) { create(:label, project: project, priority: 1) }
-          let_it_be(:label_2) { create(:label, project: project, priority: 5) }
-          let_it_be(:issue1) { create(:issue, project: project, labels: [label_1], milestone: late_milestone) }
-          let_it_be(:issue2) { create(:issue, project: project, labels: [label_2]) }
-          let_it_be(:issue3) { create(:issue, project: project, milestone: early_milestone) }
-          let_it_be(:issue4) { create(:issue, project: project) }
+          let_it_be(:priority_label1) { create(:label, project: project, priority: 1) }
+          let_it_be(:priority_label2) { create(:label, project: project, priority: 5) }
+          let_it_be(:priority_issue1) { create(:issue, project: project, labels: [priority_label1], milestone: late_milestone) }
+          let_it_be(:priority_issue2) { create(:issue, project: project, labels: [priority_label2]) }
+          let_it_be(:priority_issue3) { create(:issue, project: project, milestone: early_milestone) }
+          let_it_be(:priority_issue4) { create(:issue, project: project) }
+
+          it 'sorts issues ascending' do
+            expect(resolve_issues(sort: :priority_asc).items).to eq([priority_issue3, priority_issue1, priority_issue2, priority_issue4])
+          end
+
+          it 'sorts issues descending' do
+            expect(resolve_issues(sort: :priority_desc).items).to eq([priority_issue1, priority_issue3, priority_issue2, priority_issue4])
+          end
+        end
+
+        context 'when sorting by label priority' do
+          let_it_be(:project) { create(:project) }
+          let_it_be(:label1) { create(:label, project: project, priority: 1) }
+          let_it_be(:label2) { create(:label, project: project, priority: 5) }
+          let_it_be(:label3) { create(:label, project: project, priority: 10) }
+          let_it_be(:label_issue1) { create(:issue, project: project, labels: [label1]) }
+          let_it_be(:label_issue2) { create(:issue, project: project, labels: [label2]) }
+          let_it_be(:label_issue3) { create(:issue, project: project, labels: [label1, label3]) }
+          let_it_be(:label_issue4) { create(:issue, project: project) }
 
           it 'sorts issues ascending' do
-            expect(resolve_issues(sort: :priority_asc).items).to eq([issue3, issue1, issue2, issue4])
+            expect(resolve_issues(sort: :label_priority_asc).items).to eq([label_issue3, label_issue1, label_issue2, label_issue4])
           end
 
           it 'sorts issues descending' do
-            expect(resolve_issues(sort: :priority_desc).items).to eq([issue1, issue3, issue2, issue4])
+            expect(resolve_issues(sort: :label_priority_desc).items).to eq([label_issue2, label_issue3, label_issue1, label_issue4])
           end
         end
       end

spec/graphql/types/issue_sort_enum_spec.rb

@@ -8,6 +8,8 @@ describe GitlabSchema.types['IssueSort'] do
   it_behaves_like 'common sort values'
 
   it 'exposes all the existing issue sort values' do
-    expect(described_class.values.keys).to include(*%w[DUE_DATE_ASC DUE_DATE_DESC RELATIVE_POSITION_ASC])
+    expect(described_class.values.keys).to include(
+      *%w[DUE_DATE_ASC DUE_DATE_DESC RELATIVE_POSITION_ASC LABEL_PRIORITY_ASC LABEL_PRIORITY_DESC]
+    )
   end
 end

spec/requests/api/graphql/project/issues_spec.rb

@@ -252,12 +252,12 @@ describe 'getting an issue list for a project' do
 
       let_it_be(:early_milestone) { create(:milestone, project: sort_project, due_date: 10.days.from_now) }
       let_it_be(:late_milestone) { create(:milestone, project: sort_project, due_date: 30.days.from_now) }
-      let_it_be(:label_1) { create(:label, project: sort_project, priority: 1) }
-      let_it_be(:label_2) { create(:label, project: sort_project, priority: 5) }
-      let_it_be(:issue1) { create(:issue, project: sort_project, labels: [label_1], milestone: late_milestone) }
-      let_it_be(:issue2) { create(:issue, project: sort_project, labels: [label_2]) }
-      let_it_be(:issue3) { create(:issue, project: sort_project, milestone: early_milestone) }
-      let_it_be(:issue4) { create(:issue, project: sort_project) }
+      let_it_be(:priority_label1) { create(:label, project: sort_project, priority: 1) }
+      let_it_be(:priority_label2) { create(:label, project: sort_project, priority: 5) }
+      let_it_be(:priority_issue1) { create(:issue, project: sort_project, labels: [priority_label1], milestone: late_milestone) }
+      let_it_be(:priority_issue2) { create(:issue, project: sort_project, labels: [priority_label2]) }
+      let_it_be(:priority_issue3) { create(:issue, project: sort_project, milestone: early_milestone) }
+      let_it_be(:priority_issue4) { create(:issue, project: sort_project) }
 
       let_it_be(:params) { 'sort: PRIORITY_ASC' }
 
@@ -277,20 +277,20 @@ describe 'getting an issue list for a project' do
 
       context 'when ascending' do
         it 'sorts issues' do
-          expect(grab_iids).to eq([issue3.iid, issue1.iid, issue2.iid, issue4.iid])
+          expect(grab_iids).to eq([priority_issue3.iid, priority_issue1.iid, priority_issue2.iid, priority_issue4.iid])
         end
 
         context 'when paginating' do
           let(:params) { 'sort: PRIORITY_ASC, first: 2' }
 
           it 'sorts issues' do
-            expect(grab_iids).to eq([issue3.iid, issue1.iid])
+            expect(grab_iids).to eq([priority_issue3.iid, priority_issue1.iid])
 
             cursored_query = query("sort: PRIORITY_ASC, after: \"#{end_cursor}\"")
             post_graphql(cursored_query, current_user: current_user)
             response_data = JSON.parse(response.body)['data']['project']['issues']['edges']
 
-            expect(grab_iids(response_data)).to eq([issue2.iid, issue4.iid])
+            expect(grab_iids(response_data)).to eq([priority_issue2.iid, priority_issue4.iid])
           end
         end
       end
@@ -299,20 +299,90 @@ describe 'getting an issue list for a project' do
         let(:params) { 'sort: PRIORITY_DESC' }
 
         it 'sorts issues' do
-          expect(grab_iids).to eq([issue1.iid, issue3.iid, issue2.iid, issue4.iid])
+          expect(grab_iids).to eq([priority_issue1.iid, priority_issue3.iid, priority_issue2.iid, priority_issue4.iid])
         end
 
         context 'when paginating' do
           let(:params) { 'sort: PRIORITY_DESC, first: 2' }
 
           it 'sorts issues' do
-            expect(grab_iids).to eq([issue1.iid, issue3.iid])
+            expect(grab_iids).to eq([priority_issue1.iid, priority_issue3.iid])
 
             cursored_query = query("sort: PRIORITY_DESC, after: \"#{end_cursor}\"")
             post_graphql(cursored_query, current_user: current_user)
             response_data = JSON.parse(response.body)['data']['project']['issues']['edges']
 
-            expect(grab_iids(response_data)).to eq([issue2.iid, issue4.iid])
+            expect(grab_iids(response_data)).to eq([priority_issue2.iid, priority_issue4.iid])
+          end
+        end
+      end
+    end
+
+    context 'when sorting by label priority' do
+      let_it_be(:sort_project) { create(:project, :public) }
+
+      let_it_be(:label1) { create(:label, project: sort_project, priority: 1) }
+      let_it_be(:label2) { create(:label, project: sort_project, priority: 5) }
+      let_it_be(:label3) { create(:label, project: sort_project, priority: 10) }
+      let_it_be(:label_issue1) { create(:issue, project: sort_project, labels: [label1]) }
+      let_it_be(:label_issue2) { create(:issue, project: sort_project, labels: [label2]) }
+      let_it_be(:label_issue3) { create(:issue, project: sort_project, labels: [label1, label3]) }
+      let_it_be(:label_issue4) { create(:issue, project: sort_project) }
+
+      let_it_be(:params) { 'sort: LABEL_PRIORITY_ASC' }
+
+      def query(issue_params = params)
+        graphql_query_for(
+          'project',
+          { 'fullPath' => sort_project.full_path },
+          "issues(#{issue_params}) { pageInfo { endCursor} edges { node { iid dueDate } } }"
+        )
+      end
+
+      before do
+        post_graphql(query, current_user: current_user)
+      end
+
+      it_behaves_like 'a working graphql query'
+
+      context 'when ascending' do
+        it 'sorts issues' do
+          expect(grab_iids).to eq [label_issue3.iid, label_issue1.iid, label_issue2.iid, label_issue4.iid]
+        end
+
+        context 'when paginating' do
+          let(:params) { 'sort: LABEL_PRIORITY_ASC, first: 2' }
+
+          it 'sorts issues' do
+            expect(grab_iids).to eq [label_issue3.iid, label_issue1.iid]
+
+            cursored_query = query("sort: LABEL_PRIORITY_ASC, after: \"#{end_cursor}\"")
+            post_graphql(cursored_query, current_user: current_user)
+            response_data = JSON.parse(response.body)['data']['project']['issues']['edges']
+
+            expect(grab_iids(response_data)).to eq [label_issue2.iid, label_issue4.iid]
+          end
+        end
+      end
+
+      context 'when descending' do
+        let(:params) { 'sort: LABEL_PRIORITY_DESC' }
+
+        it 'sorts issues' do
+          expect(grab_iids).to eq [label_issue2.iid, label_issue3.iid, label_issue1.iid, label_issue4.iid]
+        end
+
+        context 'when paginating' do
+          let(:params) { 'sort: LABEL_PRIORITY_DESC, first: 2' }
+
+          it 'sorts issues' do
+            expect(grab_iids).to eq [label_issue2.iid, label_issue3.iid]
+
+            cursored_query = query("sort: LABEL_PRIORITY_DESC, after: \"#{end_cursor}\"")
+            post_graphql(cursored_query, current_user: current_user)
+            response_data = JSON.parse(response.body)['data']['project']['issues']['edges']
+
+            expect(grab_iids(response_data)).to eq [label_issue1.iid, label_issue4.iid]
           end
         end
       end