Sort graphql issues by due_date

and add new IssueSortEnum values

app/graphql/types/issue_sort_enum.rb

@@ -5,6 +5,9 @@ module Types
   class IssueSortEnum < IssuableSortEnum
     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'
   end
   # rubocop: enable Graphql/AuthorizeTypes
 end

app/models/issue.rb

@@ -138,8 +138,8 @@ class Issue < ApplicationRecord
   def self.sort_by_attribute(method, excluded_labels: [])
     case method.to_s
     when 'closest_future_date', 'closest_future_date_asc' then order_closest_future_date
-    when 'due_date', 'due_date_asc'                       then order_due_date_asc
-    when 'due_date_desc'                                  then order_due_date_desc
+    when 'due_date', 'due_date_asc'                       then order_due_date_asc.with_order_id_desc
+    when 'due_date_desc'                                  then order_due_date_desc.with_order_id_desc
     when 'relative_position', 'relative_position_asc'     then order_relative_position_asc.with_order_id_desc
     else
       super

changelogs/unreleased/63778-graphql-add-issue-due-date-sortring.yml

+---
+title: 'Issues queried in GraphQL now sortable by due date'
+merge_request: 18094
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -2641,6 +2641,16 @@ type IssuePermissions {
 Values for sorting issues
 """
 enum IssueSort {
+  """
+  Due date by ascending order
+  """
+  DUE_DATE_ASC
+
+  """
+  Due date by descending order
+  """
+  DUE_DATE_DESC
+
   """
   Created at ascending order
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -13353,6 +13353,18 @@
               "description": "Created at ascending order",
               "isDeprecated": false,
               "deprecationReason": null
+            },
+            {
+              "name": "DUE_DATE_ASC",
+              "description": "Due date by ascending order",
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "DUE_DATE_DESC",
+              "description": "Due date by descending order",
+              "isDeprecated": false,
+              "deprecationReason": null
             }
           ],
           "possibleTypes": null

spec/graphql/resolvers/issues_resolver_spec.rb

@@ -72,8 +72,33 @@ describe Resolvers::IssuesResolver do
         expect(resolve_issues(search: 'foo')).to contain_exactly(issue2)
       end
 
-      it 'sort issues' do
-        expect(resolve_issues(sort: 'created_desc')).to eq [issue2, issue1]
+      describe 'sorting' do
+        context 'when sorting by created' do
+          it 'sorts issues ascending' do
+            expect(resolve_issues(sort: 'created_asc')).to eq [issue1, issue2]
+          end
+
+          it 'sorts issues descending' do
+            expect(resolve_issues(sort: 'created_desc')).to eq [issue2, issue1]
+          end
+        end
+
+        context 'when sorting by due date' do
+          let(:project) { create(:project) }
+
+          let!(:due_issue1) { create(:issue, project: project, due_date: 3.days.from_now) }
+          let!(:due_issue2) { create(:issue, project: project, due_date: nil) }
+          let!(:due_issue3) { create(:issue, project: project, due_date: 2.days.ago) }
+          let!(:due_issue4) { create(:issue, project: project, due_date: nil) }
+
+          it 'sorts issues ascending' do
+            expect(resolve_issues(sort: :due_date_asc)).to eq [due_issue3, due_issue1, due_issue4, due_issue2]
+          end
+
+          it 'sorts issues descending' do
+            expect(resolve_issues(sort: :due_date_desc)).to eq [due_issue1, due_issue3, due_issue4, due_issue2]
+          end
+        end
       end
 
       it 'returns issues user can see' do

spec/graphql/types/issue_sort_enum_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GitlabSchema.types['IssueSort'] do
+  it { expect(described_class.graphql_name).to eq('IssueSort') }
+
+  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])
+  end
+end

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

@@ -64,7 +64,7 @@ describe 'getting an issue list for a project' do
       end
     end
 
-    it "is expected to check permissions on the first issue only" do
+    it 'is expected to check permissions on the first issue only' do
       allow(Ability).to receive(:allowed?).and_call_original
       # Newest first, we only want to see the newest checked
       expect(Ability).not_to receive(:allowed?).with(current_user, :read_issue, issues.first)
@@ -116,4 +116,95 @@ describe 'getting an issue list for a project' do
       end
     end
   end
+
+  describe 'sorting and pagination' do
+    let(:start_cursor) { graphql_data['project']['issues']['pageInfo']['startCursor'] }
+    let(:end_cursor) { graphql_data['project']['issues']['pageInfo']['endCursor'] }
+
+    context 'when sorting by due date' do
+      let(:sort_project) { create(:project, :public) }
+
+      let!(:due_issue1) { create(:issue, project: sort_project, due_date: 3.days.from_now) }
+      let!(:due_issue2) { create(:issue, project: sort_project, due_date: nil) }
+      let!(:due_issue3) { create(:issue, project: sort_project, due_date: 2.days.ago) }
+      let!(:due_issue4) { create(:issue, project: sort_project, due_date: nil) }
+      let!(:due_issue5) { create(:issue, project: sort_project, due_date: 1.day.ago) }
+
+      let(:params) { 'sort: DUE_DATE_ASC' }
+
+      def query(issue_params = params)
+        graphql_query_for(
+          'project',
+          { 'fullPath' => sort_project.full_path },
+          <<~ISSUES
+          issues(#{issue_params}) {
+            pageInfo {
+              endCursor
+            }
+            edges {
+              node {
+                iid
+                dueDate
+              }
+            }
+          }
+          ISSUES
+        )
+      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 [due_issue3.iid, due_issue5.iid, due_issue1.iid, due_issue4.iid, due_issue2.iid]
+        end
+
+        context 'when paginating' do
+          let(:params) { 'sort: DUE_DATE_ASC, first: 2' }
+
+          it 'sorts issues' do
+            expect(grab_iids).to eq [due_issue3.iid, due_issue5.iid]
+
+            cursored_query = query("sort: DUE_DATE_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 [due_issue1.iid, due_issue4.iid, due_issue2.iid]
+          end
+        end
+      end
+
+      context 'when descending' do
+        let(:params) { 'sort: DUE_DATE_DESC' }
+
+        it 'sorts issues' do
+          expect(grab_iids).to eq [due_issue1.iid, due_issue5.iid, due_issue3.iid, due_issue4.iid, due_issue2.iid]
+        end
+
+        context 'when paginating' do
+          let(:params) { 'sort: DUE_DATE_DESC, first: 2' }
+
+          it 'sorts issues' do
+            expect(grab_iids).to eq [due_issue1.iid, due_issue5.iid]
+
+            cursored_query = query("sort: DUE_DATE_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 [due_issue3.iid, due_issue4.iid, due_issue2.iid]
+          end
+        end
+      end
+    end
+  end
+
+  def grab_iids(data = issues_data)
+    data.map do |issue|
+      issue.dig('node', 'iid').to_i
+    end
+  end
 end

spec/support/shared_examples/graphql/sort_enum_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'common sort values' do
+  it 'exposes all the existing common sort values' do
+    expect(described_class.values.keys).to include(*%w[updated_desc updated_asc created_desc created_asc])
+  end
+end