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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Rails
# This cop is used to identify usages of `all.each` and
# change them to use `all.find_each` instead.
#
# @example
# # bad
# User.all.each
#
# # good
# User.all.find_each
class FindEach < Cop
MSG = 'Use `find_each` instead of `each`.'.freeze
SCOPE_METHODS = %i[
all eager_load includes joins left_joins left_outer_joins not preload
references unscoped where
].freeze
IGNORED_METHODS = %i[order limit select].freeze
def on_send(node)
return unless node.receiver &&
node.receiver.send_type? &&
node.method?(:each)
return unless SCOPE_METHODS.include?(node.receiver.method_name)
return if method_chain(node).any? { |m| ignored_by_find_each?(m) }
add_offense(node, location: :selector)
end
def autocorrect(node)
->(corrector) { corrector.replace(node.loc.selector, 'find_each') }
end
private
def method_chain(node)
[*node.descendants.select(&:send_type?), node].map(&:method_name)
end
def ignored_by_find_each?(relation_method)
# Active Record's #find_each ignores various extra parameters
IGNORED_METHODS.include?(relation_method)
end
end
end
end
end
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