Class: RuboCop::Cop::Rails::ReadWriteAttribute

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/rails/read_write_attribute.rb

Overview

This cop checks for the use of the ‘read_attribute` or `write_attribute` methods and recommends square brackets instead.

If an attribute is missing from the instance (for example, when initialized by a partial ‘select`) then `read_attribute` will return nil, but square brackets will raise an `ActiveModel::MissingAttributeError`.

Explicitly raising an error in this situation is preferable, and that is why rubocop recommends using square brackets.

Examples:


# bad
x = read_attribute(:attr)
write_attribute(:attr, val)

# good
x = self[:attr]
self[:attr] = val

Constant Summary collapse

MSG = 
'Prefer `%<prefer>s` over `%<current>s`.'.freeze

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offense, all, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, #correct, department, #duplicate_location?, #excluded_file?, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #messages, non_rails, #parse, qualified_cop_name, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens

Methods included from PathUtil

absolute?, hidden_dir?, hidden_file_in_not_hidden_dir?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

This class inherits a constructor from RuboCop::Cop::Cop

Instance Method Details

#autocorrect(node) ⇒ Object 



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# File 'lib/rubocop/cop/rails/read_write_attribute.rb', line 42

def autocorrect(node)
  case node.method_name
  when :read_attribute
    replacement = read_attribute_replacement(node)
  when :write_attribute
    replacement = write_attribute_replacement(node)
  end

  ->(corrector) { corrector.replace(node.source_range, replacement) }
end

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/rails/read_write_attribute.rb', line 36

def on_send(node)
  return unless read_write_attribute?(node)

  add_offense(node, location: :selector)
end