Allow to update issue state on GraphQL

Accept state_event parameter on UpdateIssue mutation

app/graphql/mutations/issues/update.rb

@@ -46,6 +46,10 @@ module Mutations
                required: false,
                description: 'The ID of the milestone to be assigned, milestone will be removed if set to null.'
 
+      argument :state_event, Types::IssueStateEventEnum,
+               description: 'Close or reopen an issue.',
+               required: false
+
       def resolve(project_path:, iid:, **args)
         issue = authorized_find!(project_path: project_path, iid: iid)
         project = issue.project

app/graphql/types/issue_state_event_enum.rb

+# frozen_string_literal: true
+
+module Types
+  class IssueStateEventEnum < BaseEnum
+    graphql_name 'IssueStateEvent'
+    description 'Values for issue state events'
+
+    value 'REOPEN', 'Reopens the issue', value: 'reopen'
+    value 'CLOSE', 'Closes the issue', value: 'close'
+  end
+end

changelogs/unreleased/issue_233479-allow-graphql-to-update-issue-state.yml

+---
+title: Allow to update issue state on GraphQL
+merge_request: 44061
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -9424,6 +9424,21 @@ enum IssueState {
   opened
 }
 
+"""
+Values for issue state events
+"""
+enum IssueStateEvent {
+  """
+  Closes the issue
+  """
+  CLOSE
+
+  """
+  Reopens the issue
+  """
+  REOPEN
+}
+
 """
 Represents total number of issues for the represented statuses
 """
@@ -19007,6 +19022,11 @@ input UpdateIssueInput {
   """
   removeLabelIds: [ID!]
 
+  """
+  Close or reopen an issue.
+  """
+  stateEvent: IssueStateEvent
+
   """
   Title of the issue
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -25779,6 +25779,29 @@
           ],
           "possibleTypes": null
         },
+        {
+          "kind": "ENUM",
+          "name": "IssueStateEvent",
+          "description": "Values for issue state events",
+          "fields": null,
+          "inputFields": null,
+          "interfaces": null,
+          "enumValues": [
+            {
+              "name": "REOPEN",
+              "description": "Reopens the issue",
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "CLOSE",
+              "description": "Closes the issue",
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "possibleTypes": null
+        },
         {
           "kind": "OBJECT",
           "name": "IssueStatusCountsType",
@@ -55386,6 +55409,16 @@
               },
               "defaultValue": null
             },
+            {
+              "name": "stateEvent",
+              "description": "Close or reopen an issue.",
+              "type": {
+                "kind": "ENUM",
+                "name": "IssueStateEvent",
+                "ofType": null
+              },
+              "defaultValue": null
+            },
             {
               "name": "healthStatus",
               "description": "The desired health status",

doc/api/graphql/reference/index.md

@@ -3304,6 +3304,15 @@ State of a GitLab issue.
 | `locked` |  |
 | `opened` |  |
 
+### IssueStateEvent
+
+Values for issue state events.
+
+| Value | Description |
+| ----- | ----------- |
+| `CLOSE` | Closes the issue |
+| `REOPEN` | Reopens the issue |
+
 ### IssueType
 
 Issue type.

spec/graphql/mutations/issues/update_spec.rb

@@ -70,6 +70,23 @@ RSpec.describe Mutations::Issues::Update do
         end
       end
 
+      context 'when changing state' do
+        let_it_be_with_refind(:issue) { create(:issue, project: project, state: :opened) }
+
+        it 'closes issue' do
+          mutation_params[:state_event] = 'close'
+
+          expect { subject }.to change { issue.reload.state }.from('opened').to('closed')
+        end
+
+        it 'reopens issue' do
+          issue.close
+          mutation_params[:state_event] = 'reopen'
+
+          expect { subject }.to change { issue.reload.state }.from('closed').to('opened')
+        end
+      end
+
       context 'when changing labels' do
         let_it_be(:label_1) { create(:label, project: project) }
         let_it_be(:label_2) { create(:label, project: project) }