Add taskable filter to work item type resolver

Allows returning only taskable work item types
on the work item type resolver

app/graphql/resolvers/work_items/types_resolver.rb

@@ -5,12 +5,20 @@ module Resolvers
     class TypesResolver < BaseResolver
       type Types::WorkItems::TypeType.connection_type, null: true
 
-      def resolve
+      argument :taskable, ::GraphQL::Types::Boolean,
+               required: false,
+               description: 'If `true`, only taskable work item types will be returned.' \
+                            ' Argument is experimental and can be removed in the future without notice.'
+
+      def resolve(taskable: nil)
         return unless Feature.enabled?(:work_items, object)
 
         # This will require a finder in the future when groups/projects get their work item types
         # All groups/projects use the default types for now
-        ::WorkItems::Type.default.order_by_name_asc
+        base_scope = ::WorkItems::Type.default
+        base_scope = base_scope.by_type(:task) if taskable
+
+        base_scope.order_by_name_asc
       end
     end
   end

app/models/work_items/type.rb

@@ -38,6 +38,7 @@ module WorkItems
 
     scope :default, -> { where(namespace: nil) }
     scope :order_by_name_asc, -> { order('LOWER(name)') }
+    scope :by_type, ->(base_type) { where(base_type: base_type) }
 
     def self.default_by_type(type)
       find_by(namespace_id: nil, base_type: type)

doc/api/graphql/reference/index.md

@@ -11146,7 +11146,6 @@ four standard [pagination arguments](#connection-pagination-arguments):
 | <a id="groupvisibility"></a>`visibility` | [`String`](#string) | Visibility of the namespace. |
 | <a id="groupvulnerabilityscanners"></a>`vulnerabilityScanners` | [`VulnerabilityScannerConnection`](#vulnerabilityscannerconnection) | Vulnerability scanners reported on the project vulnerabilities of the group and its subgroups. (see [Connections](#connections)) |
 | <a id="groupweburl"></a>`webUrl` | [`String!`](#string) | Web URL of the group. |
-| <a id="groupworkitemtypes"></a>`workItemTypes` | [`WorkItemTypeConnection`](#workitemtypeconnection) | Work item types available to the group. Returns `null` if `work_items` feature flag is disabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. (see [Connections](#connections)) |
 
 #### Fields with arguments
 
@@ -11703,6 +11702,22 @@ Returns [`VulnerabilitySeveritiesCount`](#vulnerabilityseveritiescount).
 | <a id="groupvulnerabilityseveritiescountseverity"></a>`severity` | [`[VulnerabilitySeverity!]`](#vulnerabilityseverity) | Filter vulnerabilities by severity. |
 | <a id="groupvulnerabilityseveritiescountstate"></a>`state` | [`[VulnerabilityState!]`](#vulnerabilitystate) | Filter vulnerabilities by state. |
 
+##### `Group.workItemTypes`
+
+Work item types available to the group. Returns `null` if `work_items` feature flag is disabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice.
+
+Returns [`WorkItemTypeConnection`](#workitemtypeconnection).
+
+This field returns a [connection](#connections). It accepts the
+four standard [pagination arguments](#connection-pagination-arguments):
+`before: String`, `after: String`, `first: Int`, `last: Int`.
+
+###### Arguments
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| <a id="groupworkitemtypestaskable"></a>`taskable` | [`Boolean`](#boolean) | If `true`, only taskable work item types will be returned. Argument is experimental and can be removed in the future without notice. |
+
 ### `GroupMember`
 
 Represents a Group Membership.
@@ -13770,7 +13785,6 @@ Represents vulnerability finding of a security report on the pipeline.
 | <a id="projectvulnerabilityscanners"></a>`vulnerabilityScanners` | [`VulnerabilityScannerConnection`](#vulnerabilityscannerconnection) | Vulnerability scanners reported on the project vulnerabilities. (see [Connections](#connections)) |
 | <a id="projectweburl"></a>`webUrl` | [`String`](#string) | Web URL of the project. |
 | <a id="projectwikienabled"></a>`wikiEnabled` | [`Boolean`](#boolean) | Indicates if Wikis are enabled for the current user. |
-| <a id="projectworkitemtypes"></a>`workItemTypes` | [`WorkItemTypeConnection`](#workitemtypeconnection) | Work item types available to the project. Returns `null` if `work_items` feature flag is disabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. (see [Connections](#connections)) |
 
 #### Fields with arguments
 
@@ -14722,6 +14736,22 @@ Returns [`VulnerabilitySeveritiesCount`](#vulnerabilityseveritiescount).
 | <a id="projectvulnerabilityseveritiescountseverity"></a>`severity` | [`[VulnerabilitySeverity!]`](#vulnerabilityseverity) | Filter vulnerabilities by severity. |
 | <a id="projectvulnerabilityseveritiescountstate"></a>`state` | [`[VulnerabilityState!]`](#vulnerabilitystate) | Filter vulnerabilities by state. |
 
+##### `Project.workItemTypes`
+
+Work item types available to the project. Returns `null` if `work_items` feature flag is disabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice.
+
+Returns [`WorkItemTypeConnection`](#workitemtypeconnection).
+
+This field returns a [connection](#connections). It accepts the
+four standard [pagination arguments](#connection-pagination-arguments):
+`before: String`, `after: String`, `first: Int`, `last: Int`.
+
+###### Arguments
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| <a id="projectworkitemtypestaskable"></a>`taskable` | [`Boolean`](#boolean) | If `true`, only taskable work item types will be returned. Argument is experimental and can be removed in the future without notice. |
+
 ### `ProjectCiCdSetting`
 
 #### Fields

spec/graphql/resolvers/work_items/types_resolver_spec.rb

@@ -20,6 +20,14 @@ RSpec.describe Resolvers::WorkItems::TypesResolver do
       expect(result.to_a).to match(WorkItems::Type.default.order_by_name_asc)
     end
 
+    context 'when requesting taskable types' do
+      it 'returns only taskable types' do
+        result = resolve(described_class, obj: group, args: { taskable: true })
+
+        expect(result.to_a).to contain_exactly(WorkItems::Type.default_by_type(:task))
+      end
+    end
+
     context 'when work_items feature flag is disabled' do
       before do
         stub_feature_flags(work_items: false)