Drop Ruby 2.4 support

Follow rubocop/rubocop#9648.

.circleci/config.yml

@@ -38,9 +38,6 @@ workflows:
   build:
     jobs:
       - documentation-checks
-      - rake_default:
-          name: Ruby 2.4
-          image: circleci/ruby:2.4
       - rake_default:
           name: Ruby 2.5
           image: circleci/ruby:2.5

.rubocop.yml

@@ -13,7 +13,7 @@ AllCops:
     - 'vendor/**/*'
     - 'spec/fixtures/**/*'
     - 'tmp/**/*'
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
   SuggestExtensions: false
 
 InternalAffairs/NodeMatcherDirective:

CHANGELOG.md

@@ -23,6 +23,7 @@
 * [#381](https://github.com/rubocop/rubocop-rails/pull/381): Update `IgnoredMethods` list for `Lint/NumberConversion` to allow Rails' duration methods. ([@dvandersluis][])
 * [#444](https://github.com/rubocop/rubocop-rails/issues/444): Mark `Rails/Blank` as unsafe auto-correction. ([@koic][])
 * [#451](https://github.com/rubocop/rubocop-rails/issues/451): Make `Rails/RelativeDateConstant` aware of `yesterday` and `tomorrow` methods. ([@koic][])
+* [#456](https://github.com/rubocop/rubocop-rails/pull/456): Drop Ruby 2.4 support. ([@koic][])
 
 ## 2.9.1 (2020-12-16)
 

lib/rubocop/cop/rails/attribute_default_block_value.rb

@@ -75,7 +75,7 @@ class AttributeDefaultBlockValue < Base
         def on_send(node)
           default_attribute(node) do |attribute|
             value = attribute.children.last
-            return unless TYPE_OFFENDERS.any? { |type| value.type == type }
+            return unless TYPE_OFFENDERS.any?(value.type)
 
             add_offense(value) do |corrector|
               expression = default_attribute(node).children.last

rubocop-rails.gemspec

@@ -8,7 +8,7 @@ Gem::Specification.new do |s|
   s.name = 'rubocop-rails'
   s.version = RuboCop::Rails::Version::STRING
   s.platform = Gem::Platform::RUBY
-  s.required_ruby_version = '>= 2.4.0'
+  s.required_ruby_version = '>= 2.5.0'
   s.authors = ['Bozhidar Batsov', 'Jonas Arvidsson', 'Yuji Nakayama']
   s.description = <<~DESCRIPTION
     Automatic Rails code style checking tool.

tasks/cops_documentation.rake

@@ -46,17 +46,15 @@ task documentation_syntax_check: :yard_for_generate_documentation do
     end
 
     examples.to_a.each do |example|
-      begin
-        buffer = Parser::Source::Buffer.new('<code>', 1)
-        buffer.source = example.text
-        parser = Parser::Ruby25.new(RuboCop::AST::Builder.new)
-        parser.diagnostics.all_errors_are_fatal = true
-        parser.parse(buffer)
-      rescue Parser::SyntaxError => e
-        path = example.object.file
-        puts "#{path}: Syntax Error in an example. #{e}"
-        ok = false
-      end
+      buffer = Parser::Source::Buffer.new('<code>', 1)
+      buffer.source = example.text
+      parser = Parser::Ruby25.new(RuboCop::AST::Builder.new)
+      parser.diagnostics.all_errors_are_fatal = true
+      parser.parse(buffer)
+    rescue Parser::SyntaxError => e
+      path = example.object.file
+      puts "#{path}: Syntax Error in an example. #{e}"
+      ok = false
     end
   end
   abort unless ok