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Versions: 8
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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Rails
# This cop looks for duplicate values in enum declarations.
#
# @example
# # bad
# enum status: { active: 0, archived: 0 }
#
# # good
# enum status: { active: 0, archived: 1 }
#
# # bad
# enum status: [:active, :archived, :active]
#
# # good
# enum status: [:active, :archived]
class EnumUniqueness < Cop
MSG = 'Duplicate value `%s` found in `%s` enum declaration.'.freeze
def on_send(node)
_receiver, method_name, *args = *node
return unless method_name == :enum
enum_name, enum_args = parse_args(args)
dupes = arr_dupes(enum_values(enum_args))
return if dupes.empty?
add_offense(node, :selector, format(MSG, dupes.join(','), enum_name))
end
private
def enum_values(enum_args)
if enum_args.type == :array
enum_array_keys(enum_args)
else
enum_hash_values(enum_args)
end
end
def enum_array_keys(array_node)
array_node.each_child_node.map(&:source)
end
def enum_hash_values(hash_node)
hash_node.each_child_node.map do |child_node|
child_node.child_nodes.last.source
end
end
def arr_dupes(array)
array.select { |element| array.count(element) > 1 }.uniq
end
def parse_args(args)
enum_config = args.first.each_child_node.first.child_nodes
enum_name = enum_config.first.source
enum_opts = enum_config.last
[enum_name, enum_opts]
end
end
end
end
end
Version data entries
8 entries across 8 versions & 2 rubygems