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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Rails
# This cop looks for delegations that pass :allow_blank as an option
# instead of :allow_nil. :allow_blank is not a valid option to pass
# to ActiveSupport#delegate.
#
# @example
# # bad
# delegate :foo, to: :bar, allow_blank: true
#
# # good
# delegate :foo, to: :bar, allow_nil: true
class DelegateAllowBlank < Cop
MSG = '`allow_blank` is not a valid option, use `allow_nil`.'.freeze
def_node_matcher :delegate_options, <<-PATTERN
(send nil? :delegate _ $hash)
PATTERN
def_node_matcher :allow_blank_option?, <<-PATTERN
(pair (sym :allow_blank) true)
PATTERN
def on_send(node)
offending_node = allow_blank_option(node)
return unless offending_node
add_offense(offending_node)
end
def autocorrect(pair_node)
lambda do |corrector|
corrector.replace(pair_node.key.source_range, 'allow_nil')
end
end
private
def allow_blank_option(node)
delegate_options(node) do |hash|
hash.pairs.find { |opt| allow_blank_option?(opt) }
end
end
end
end
end
end
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