Remove `:graphql` feature flag

- Remove `FeatureConstrainer` call wrapping api endpoint
- Remove `Feature.enabled?(:graphql)` conditionals in back and frontend
- Modify graphql test to be graphql flag agnostic
- Remove api routing spec
- Remove frontend feature flag via `gon`

app/assets/javascripts/pages/projects/issues/form.js

@@ -17,7 +17,5 @@ export default () => {
   new MilestoneSelect();
   new IssuableTemplateSelectors();
 
-  if (gon.features.graphql) {
-    initSuggestions();
-  }
+  initSuggestions();
 };

app/controllers/graphql_controller.rb

@@ -11,7 +11,6 @@ class GraphqlController < ApplicationController
   # around in GraphiQL.
   protect_from_forgery with: :null_session, only: :execute
 
-  before_action :check_graphql_feature_flag!
   before_action :authorize_access_api!
   before_action(only: [:execute]) { authenticate_sessionless_user!(:api) }
 
@@ -86,8 +85,4 @@ class GraphqlController < ApplicationController
 
     render json: error, status: status
   end
-
-  def check_graphql_feature_flag!
-    render_404 unless Gitlab::Graphql.enabled?
-  end
 end

app/controllers/projects/issues_controller.rb

@@ -45,8 +45,6 @@ class Projects::IssuesController < Projects::ApplicationController
   before_action :authorize_import_issues!, only: [:import_csv]
   before_action :authorize_download_code!, only: [:related_branches]
 
-  before_action :set_suggested_issues_feature_flags, only: [:new]
-
   respond_to :html
 
   def index
@@ -285,8 +283,4 @@ class Projects::IssuesController < Projects::ApplicationController
     # 3. https://gitlab.com/gitlab-org/gitlab-ce/issues/42426
     Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-ce/issues/42422')
   end
-
-  def set_suggested_issues_feature_flags
-    push_frontend_feature_flag(:graphql, default_enabled: true)
-  end
 end

app/helpers/projects_helper.rb

@@ -662,6 +662,6 @@ module ProjectsHelper
   end
 
   def vue_file_list_enabled?
-    Gitlab::Graphql.enabled? && Feature.enabled?(:vue_file_list, @project)
+    Feature.enabled?(:vue_file_list, @project)
   end
 end

app/views/shared/issuable/_form.html.haml

@@ -17,8 +17,7 @@
 
   = render 'shared/issuable/form/template_selector', issuable: issuable
   = render 'shared/issuable/form/title', issuable: issuable, form: form, has_wip_commits: commits && commits.detect(&:work_in_progress?)
-- if Gitlab::Graphql.enabled?
-  #js-suggestions{ data: { project_path: @project.full_path } }
+#js-suggestions{ data: { project_path: @project.full_path } }
 
 = render 'shared/form_elements/description', model: issuable, form: form, project: project
 

config/routes/api.rb

-constraints(::Constraints::FeatureConstrainer.new(:graphql, default_enabled: true)) do
-  post '/api/graphql', to: 'graphql#execute'
-  mount GraphiQL::Rails::Engine, at: '/-/graphql-explorer', graphql_path: '/api/graphql'
-end
+post '/api/graphql', to: 'graphql#execute'
+mount GraphiQL::Rails::Engine, at: '/-/graphql-explorer', graphql_path: '/api/graphql'
 
 ::API::API.logger Rails.logger
 mount ::API::API => '/'

doc/api/graphql/index.md

-# GraphQL API (Alpha)
+# GraphQL API
 
 > [Introduced][ce-19008] in GitLab 11.0.
 
@@ -23,23 +23,13 @@ programmatically with GitLab. To achieve this, it needs full coverage - anything
 possible in the REST API should also be possible in the GraphQL API.
 
 To help us meet this vision, the frontend should use GraphQL in preference to
-the REST API for new features, although the alpha status of GraphQL may prevent
-this from being a possibility at times.
+the REST API for new features.
 
 There are no plans to deprecate the REST API. To reduce the technical burden of
 supporting two APIs in parallel, they should share implementations as much as
 possible.
 
-## Enabling the GraphQL feature
-
-The GraphQL API itself is currently in Alpha, and therefore hidden behind a
-feature flag. You can enable the feature using the [features api][features-api] on a self-hosted instance.
-
-For example:
-
-```shell
-curl --data "value=100" --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/features/graphql
-```
+As of the 12.1 release, GraphQL is always enabled.
 
 ## Available queries
 

lib/api/helpers/graphql_helpers.rb

@@ -7,8 +7,6 @@ module API
     # should be in app/graphql/ or lib/gitlab/graphql/
     module GraphqlHelpers
       def conditionally_graphql!(fallback:, query:, context: {}, transform: nil)
-        return fallback.call unless Feature.enabled?(:graphql)
-
         result = GitlabSchema.execute(query, context: context)
 
         if transform

lib/gitlab/graphql.rb

@@ -3,9 +3,5 @@
 module Gitlab
   module Graphql
     StandardGraphqlError = Class.new(StandardError)
-
-    def self.enabled?
-      Feature.enabled?(:graphql, default_enabled: true)
-    end
   end
 end

spec/requests/api/graphql_spec.rb

@@ -6,16 +6,6 @@ describe 'GraphQL' do
 
   let(:query) { graphql_query_for('echo', 'text' => 'Hello world' ) }
 
-  context 'graphql is disabled by feature flag' do
-    before do
-      stub_feature_flags(graphql: false)
-    end
-
-    it 'does not generate a route for GraphQL' do
-      expect { post_graphql(query) }.to raise_error(ActionController::RoutingError)
-    end
-  end
-
   context 'logging' do
     shared_examples 'logging a graphql query' do
       let(:expected_params) do

spec/routing/api_routing_spec.rb

-require 'spec_helper'
-
-describe 'api', 'routing' do
-  context 'when graphql is disabled' do
-    before do
-      stub_feature_flags(graphql: false)
-    end
-
-    it 'does not route to the GraphqlController' do
-      expect(post('/api/graphql')).not_to route_to('graphql#execute')
-    end
-  end
-
-  context 'when graphql is enabled' do
-    before do
-      stub_feature_flags(graphql: true)
-    end
-
-    it 'routes to the GraphqlController' do
-      expect(post('/api/graphql')).to route_to('graphql#execute')
-    end
-  end
-end