Add cicd settings for merge trains to gql

Add the ci cd settings for merge trains to the gql
api

app/graphql/types/ci/ci_cd_setting_type.rb

+# frozen_string_literal: true
+
+module Types
+  module Ci
+    class CiCdSettingType < BaseObject
+      graphql_name 'ProjectCiCdSetting'
+
+      authorize :admin_project
+
+      field :merge_pipelines_enabled, GraphQL::BOOLEAN_TYPE, null: true,
+        description: 'Whether merge pipelines are enabled.',
+        method: :merge_pipelines_enabled?
+      field :merge_trains_enabled, GraphQL::BOOLEAN_TYPE, null: true,
+        description:  'Whether merge trains are enabled.',
+        method: :merge_trains_enabled?
+      field :project, Types::ProjectType, null: true,
+        description: 'Project the CI/CD settings belong to.'
+    end
+  end
+end

app/graphql/types/project_type.rb

@@ -191,6 +191,11 @@ module Types
           description: 'Build pipeline of the project',
           resolver: Resolvers::ProjectPipelineResolver
 
+    field :ci_cd_settings,
+          Types::Ci::CiCdSettingType,
+          null: true,
+          description: 'CI/CD settings for the project'
+
     field :sentry_detailed_error,
           Types::ErrorTracking::SentryDetailedErrorType,
           null: true,

app/policies/project_ci_cd_setting_policy.rb

+# frozen_string_literal: true
+
+class ProjectCiCdSettingPolicy < BasePolicy
+  delegate { @subject.project }
+end

changelogs/unreleased/282520-follow-up-enable-and-disable-merge-train-checkbox-based-on-pipelin.yml

+---
+title: Add Merge Train Setting to the graphql api
+merge_request: 49402
+author:
+type: changed

doc/api/graphql/reference/gitlab_schema.graphql

@@ -16229,6 +16229,11 @@ type Project {
     last: Int
   ): BoardConnection
 
+  """
+  CI/CD settings for the project
+  """
+  ciCdSettings: ProjectCiCdSetting
+
   """
   Find a single cluster agent by name
   """
@@ -17906,6 +17911,23 @@ type Project {
   wikiEnabled: Boolean
 }
 
+type ProjectCiCdSetting {
+  """
+  Whether merge pipelines are enabled.
+  """
+  mergePipelinesEnabled: Boolean
+
+  """
+  Whether merge trains are enabled.
+  """
+  mergeTrainsEnabled: Boolean
+
+  """
+  Project the CI/CD settings belong to.
+  """
+  project: Project
+}
+
 """
 The connection type for Project.
 """

doc/api/graphql/reference/gitlab_schema.json

@@ -48281,6 +48281,20 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "ciCdSettings",
+              "description": "CI/CD settings for the project",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "ProjectCiCdSetting",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "clusterAgent",
               "description": "Find a single cluster agent by name",
@@ -52337,6 +52351,61 @@
           "enumValues": null,
           "possibleTypes": null
         },
+        {
+          "kind": "OBJECT",
+          "name": "ProjectCiCdSetting",
+          "description": null,
+          "fields": [
+            {
+              "name": "mergePipelinesEnabled",
+              "description": "Whether merge pipelines are enabled.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Boolean",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "mergeTrainsEnabled",
+              "description": "Whether merge trains are enabled.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Boolean",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "project",
+              "description": "Project the CI/CD settings belong to.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "Project",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "inputFields": null,
+          "interfaces": [
+
+          ],
+          "enumValues": null,
+          "possibleTypes": null
+        },
         {
           "kind": "OBJECT",
           "name": "ProjectConnection",

doc/api/graphql/reference/index.md

@@ -2521,6 +2521,7 @@ Autogenerated return type of PipelineRetry.
 | `avatarUrl` | String | URL to avatar image file of the project |
 | `board` | Board | A single board of the project |
 | `boards` | BoardConnection | Boards of the project |
+| `ciCdSettings` | ProjectCiCdSetting | CI/CD settings for the project |
 | `clusterAgent` | ClusterAgent | Find a single cluster agent by name |
 | `clusterAgents` | ClusterAgentConnection | Cluster agents associated with the project |
 | `codeCoverageSummary` | CodeCoverageSummary | Code coverage summary associated with the project |
@@ -2615,6 +2616,14 @@ Autogenerated return type of PipelineRetry.
 | `webUrl` | String | Web URL of the project |
 | `wikiEnabled` | Boolean | Indicates if Wikis are enabled for the current user |
 
+### ProjectCiCdSetting
+
+| Field | Type | Description |
+| ----- | ---- | ----------- |
+| `mergePipelinesEnabled` | Boolean | Whether merge pipelines are enabled. |
+| `mergeTrainsEnabled` | Boolean | Whether merge trains are enabled. |
+| `project` | Project | Project the CI/CD settings belong to. |
+
 ### ProjectMember
 
 Represents a Project Membership.

spec/requests/api/graphql/ci/ci_cd_setting_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe 'Getting Ci Cd Setting' do
+  include GraphqlHelpers
+
+  let_it_be_with_reload(:project) { create(:project, :repository) }
+  let_it_be(:current_user) { project.owner }
+
+  let(:fields) do
+    <<~QUERY
+      #{all_graphql_fields_for('ProjectCiCdSetting')}
+    QUERY
+  end
+
+  let(:query) do
+    graphql_query_for(
+      'project',
+      { 'fullPath' => project.full_path },
+      query_graphql_field('ciCdSettings', {}, fields)
+    )
+  end
+
+  let(:settings_data) { graphql_data['project']['ciCdSettings'] }
+
+  context 'without permissions' do
+    let(:user) { create(:user) }
+
+    before do
+      project.add_reporter(user)
+      post_graphql(query, current_user: user)
+    end
+
+    it_behaves_like 'a working graphql query'
+
+    specify { expect(settings_data).to be nil }
+  end
+
+  context 'with project permissions' do
+    before do
+      post_graphql(query, current_user: current_user)
+    end
+
+    it_behaves_like 'a working graphql query'
+
+    specify { expect(settings_data['mergePipelinesEnabled']).to eql project.ci_cd_settings.merge_pipelines_enabled? }
+    specify { expect(settings_data['mergeTrainsEnabled']).to eql project.ci_cd_settings.merge_trains_enabled? }
+    specify { expect(settings_data['project']['id']).to eql "gid://gitlab/Project/#{project.id}" }
+  end
+end