Support auto-correction for Rails/ScopeArgs

This PR supports auto-correction for `Rails/ScopeArgs`.

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### New features
 
 * [#521](https://github.com/rubocop/rubocop-rails/pull/521): Support auto-correction for `Rails/Output`. ([@koic][])
+* [#520](https://github.com/rubocop/rubocop-rails/pull/520): Support auto-correction for `Rails/ScopeArgs`. ([@koic][])
 
 ## 2.11.3 (2021-07-11)
 

config/default.yml

@@ -714,6 +714,7 @@ Rails/ScopeArgs:
  Description: 'Checks the arguments of ActiveRecord scopes.'
  Enabled: true
  VersionAdded: '0.19'
+ VersionChanged: '2.12'
  Include:
  - app/models/**/*.rb
 

docs/modules/ROOT/pages/cops_rails.adoc

@@ -4300,9 +4300,9 @@ Service::Mailer::update
 
 | Enabled
 | Yes
-| No
+| Yes
 | 0.19
-| -
+| 2.12
 |===
 
 This cop checks for scope calls where it was passed

lib/rubocop/cop/rails/scope_args.rb

@@ -14,14 +14,18 @@ module Rails
  # # good
  # scope :something, -> { where(something: true) }
  class ScopeArgs < Base
+ extend AutoCorrector
+
  MSG = 'Use `lambda`/`proc` instead of a plain method call.'
  RESTRICT_ON_SEND = %i[scope].freeze
 
  def_node_matcher :scope?, '(send nil? :scope _ $send)'
 
  def on_send(node)
  scope?(node) do |second_arg|
- add_offense(second_arg)
+ add_offense(second_arg) do |corrector|
+ corrector.replace(second_arg, "-> { #{second_arg.source} }")
+ end
  end
  end
  end

spec/rubocop/cop/rails/scope_args_spec.rb

@@ -1,11 +1,15 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::Rails::ScopeArgs, :config do
- it 'registers an offense a scope with a method arg' do
+ it 'registers and corrects an offense a scope with a method arg' do
  expect_offense(<<~RUBY)
  scope :active, where(active: true)
  ^^^^^^^^^^^^^^^^^^^ Use `lambda`/`proc` instead of a plain method call.
  RUBY
+
+ expect_correction(<<~RUBY)
+ scope :active, -> { where(active: true) }
+ RUBY
  end
 
  it 'accepts a non send argument' do