Support filtering by assignee wildcard in GraphQL

app/graphql/resolvers/concerns/board_issue_filterable.rb

@@ -18,6 +18,17 @@ module BoardIssueFilterable
   end
 
   def set_filter_values(filters)
+    filter_by_assignee(filters)
+  end
+
+  def filter_by_assignee(filters)
+    if filters[:assignee_username] && filters[:assignee_wildcard_id]
+      raise ::Gitlab::Graphql::Errors::ArgumentError, 'Incompatible arguments: assigneeUsername, assigneeWildcardId.'
+    end
+
+    if filters[:assignee_wildcard_id]
+      filters[:assignee_id] = filters.delete(:assignee_wildcard_id)
+    end
   end
 end
 

app/graphql/types/boards/assignee_wildcard_id_enum.rb

+# frozen_string_literal: true
+
+module Types
+  module Boards
+    class AssigneeWildcardIdEnum < BaseEnum
+      graphql_name 'AssigneeWildcardId'
+      description 'Assignee ID wildcard values'
+
+      value 'NONE', 'No assignee is assigned.'
+      value 'ANY', 'An assignee is assigned.'
+    end
+  end
+end

app/graphql/types/boards/board_issue_input_type.rb

@@ -18,6 +18,10 @@ module Types
       argument :search, GraphQL::STRING_TYPE,
                required: false,
                description: 'Search query for issue title or description.'
+
+      argument :assignee_wildcard_id, ::Types::Boards::AssigneeWildcardIdEnum,
+               required: false,
+               description: 'Filter by assignee wildcard. Incompatible with assigneeUsername.'
     end
   end
 end

changelogs/unreleased/280781-support-assignee-wildcard-filters-board-issues-graphql.yml

+---
+title: Support filtering by assignee wildcard in GraphQL board list issues query
+merge_request: 58996
+author:
+type: added

doc/api/graphql/reference/index.md

@@ -7525,6 +7525,15 @@ The kind of an approval rule.
 | `REGULAR` | A `regular` approval rule. |
 | `REPORT_APPROVER` | A `report_approver` approval rule. |
 
+### `AssigneeWildcardId`
+
+Assignee ID wildcard values.
+
+| Value | Description |
+| ----- | ----------- |
+| `ANY` | An assignee is assigned. |
+| `NONE` | No assignee is assigned. |
+
 ### `AvailabilityEnum`
 
 User availability status.

ee/app/graphql/ee/resolvers/board_issue_filterable.rb

@@ -10,6 +10,8 @@ module EE
       def set_filter_values(filters)
         filter_by_epic(filters)
         filter_by_iteration(filters)
+
+        super
       end
 
       private

spec/graphql/resolvers/board_list_issues_resolver_spec.rb

@@ -39,6 +39,24 @@ RSpec.describe Resolvers::BoardListIssuesResolver do
 
         expect(result).to match_array([issue1])
       end
+
+      it 'raises an exception if both assignee_username and assignee_wildcard_id are present' do
+        expect do
+          resolve_board_list_issues(args: { filters: { assignee_username: ['username'], assignee_wildcard_id: 'NONE' } })
+        end.to raise_error(Gitlab::Graphql::Errors::ArgumentError)
+      end
+
+      it 'accepts assignee wildcard id NONE' do
+        result = resolve_board_list_issues(args: { filters: { assignee_wildcard_id: 'NONE' } })
+
+        expect(result).to match_array([issue1, issue2, issue3])
+      end
+
+      it 'accepts assignee wildcard id ANY' do
+        result = resolve_board_list_issues(args: { filters: { assignee_wildcard_id: 'ANY' } })
+
+        expect(result).to match_array([])
+      end
     end
   end
 

spec/graphql/types/boards/board_issue_input_type_spec.rb

@@ -5,9 +5,9 @@ require 'spec_helper'
 RSpec.describe GitlabSchema.types['BoardIssueInput'] do
   it { expect(described_class.graphql_name).to eq('BoardIssueInput') }
 
-  it 'exposes negated issue arguments' do
+  it 'has specific fields' do
     allowed_args = %w(labelName milestoneTitle assigneeUsername authorUsername
-                      releaseTag myReactionEmoji not search)
+                      releaseTag myReactionEmoji not search assigneeWildcardId)
 
     expect(described_class.arguments.keys).to include(*allowed_args)
     expect(described_class.arguments['not'].type).to eq(Types::Boards::NegatedBoardIssueInputType)