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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Rails
# This cop looks for enums written with array syntax.
#
# When using array syntax, adding an element in a
# position other than the last causes all previous
# definitions to shift. Explicitly specifying the
# value for each key prevents this from happening.
#
# @example
# # bad
# enum status: [:active, :archived]
#
# # good
# enum status: { active: 0, archived: 1 }
#
class EnumHash < Cop
MSG = 'Enum defined as an array found in `%<enum>s` enum declaration. '\
'Use hash syntax instead.'
def_node_matcher :enum?, <<~PATTERN
(send nil? :enum (hash $...))
PATTERN
def_node_matcher :array_pair?, <<~PATTERN
(pair $_ $array)
PATTERN
def on_send(node)
enum?(node) do |pairs|
pairs.each do |pair|
key, array = array_pair?(pair)
next unless key
add_offense(array, message: format(MSG, enum: enum_name(key)))
end
end
end
def autocorrect(node)
hash = node.children.each_with_index.map do |elem, index|
"#{source(elem)} => #{index}"
end.join(', ')
->(corrector) { corrector.replace(node.loc.expression, "{#{hash}}") }
end
private
def enum_name(key)
case key.type
when :sym, :str
key.value
else
key.source
end
end
def source(elem)
case elem.type
when :str
elem.value.dump
when :sym
elem.value.inspect
else
elem.source
end
end
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems