Add locked as an argument to updateIssue

app/graphql/mutations/issues/update.rb

@@ -25,6 +25,12 @@ module Mutations
                required: false,
                description: copy_field_description(Types::IssueType, :confidential)
 
+      argument :locked,
+               GraphQL::BOOLEAN_TYPE,
+               as: :discussion_locked,
+               required: false,
+               description: copy_field_description(Types::IssueType, :discussion_locked)
+
       def resolve(project_path:, iid:, **args)
         issue = authorized_find!(project_path: project_path, iid: iid)
         project = issue.project

changelogs/unreleased/36319-follow-up.yml

+---
+title: Add locked as an argument to updateIssue
+merge_request: 37105
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -14122,6 +14122,11 @@ input UpdateIssueInput {
   """
   iid: String!
 
+  """
+  Indicates discussion is locked on the issue
+  """
+  locked: Boolean
+
   """
   The project the issue to mutate is in
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -41716,6 +41716,16 @@
               },
               "defaultValue": null
             },
+            {
+              "name": "locked",
+              "description": "Indicates discussion is locked on the issue",
+              "type": {
+                "kind": "SCALAR",
+                "name": "Boolean",
+                "ofType": null
+              },
+              "defaultValue": null
+            },
             {
               "name": "healthStatus",
               "description": "The desired health status",

spec/graphql/mutations/issues/update_spec.rb

@@ -3,14 +3,15 @@
 require 'spec_helper'
 
 RSpec.describe Mutations::Issues::Update do
-  let(:issue) { create(:issue) }
-  let(:user) { create(:user) }
+  let_it_be(:issue) { create(:issue) }
+  let_it_be(:user) { create(:user) }
   let(:expected_attributes) do
     {
       title: 'new title',
       description: 'new description',
       confidential: true,
-      due_date: Date.tomorrow
+      due_date: Date.tomorrow,
+      discussion_locked: true
     }
   end
   let(:mutation) { described_class.new(object: nil, context: { current_user: user }, field: nil) }
@@ -28,9 +29,11 @@ RSpec.describe Mutations::Issues::Update do
 
     subject { mutation.resolve(mutation_params) }
 
-    it 'raises an error if the resource is not accessible to the user' do
+    context 'when the user cannot access the issue' do
+      it 'raises an error' do
         expect { subject }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
       end
+    end
 
     context 'when the user can update the issue' do
       before do

spec/requests/api/graphql/mutations/issues/update_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Update of an existing issue' do
+  include GraphqlHelpers
+
+  let_it_be(:current_user) { create(:user) }
+  let_it_be(:project) { create(:project, :public) }
+  let_it_be(:issue) { create(:issue, project: project) }
+  let(:input) do
+    {
+      project_path: project.full_path,
+      iid: issue.iid.to_s,
+      locked: true
+    }
+  end
+
+  let(:mutation) { graphql_mutation(:update_issue, input) }
+  let(:mutation_response) { graphql_mutation_response(:update_issue) }
+
+  context 'the user is not allowed to update issue' do
+    it_behaves_like 'a mutation that returns top-level errors',
+      errors: ['The resource that you are attempting to access does not exist or you don\'t have permission to perform this action']
+  end
+
+  context 'when user has permissions to update issue' do
+    before do
+      project.add_developer(current_user)
+    end
+
+    it 'updates the issue' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response['issue']).to include(
+        'discussionLocked' => true
+      )
+    end
+  end
+end