Class: RuboCop::Cop::Lint::DuplicateHashKey

Inherits:
Base
  • Object
show all
Includes:
Duplication
Defined in:
lib/rubocop/cop/lint/duplicate_hash_key.rb

Overview

Checks for duplicated keys in hash literals. This cop considers both primitive types and constants for the hash keys.

This cop mirrors a warning in Ruby 2.2.

Examples:


# bad
hash = { food: 'apple', food: 'orange' }

# good
hash = { food: 'apple', other_food: 'orange' }

Constant Summary collapse

MSG = 
'Duplicated key in hash literal.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods inherited from Base

#active_support_extensions_enabled?, #add_global_offense, #add_offense, #always_autocorrect?, autocorrect_incompatible_with, badge, #begin_investigation, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #cop_config, cop_name, #cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, #inspect, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #parser_engine, #ready, #relevant_file?, requires_gem, #string_literals_frozen_by_default?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #autocorrect_with_disable_uncorrectable?, #correctable?, #disable_uncorrectable?, #safe_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

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

Instance Method Details

#on_hash(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/duplicate_hash_key.rb', line 23

def on_hash(node)
  keys = node.keys.select { |key| key.recursive_basic_literal? || key.const_type? }

  return unless duplicates?(keys)

  consecutive_duplicates(keys).each { |key| add_offense(key) }
end