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module RuboCop
module Cop
module Gitlab
class PredicateMemoization < RuboCop::Cop::Cop
MSG = <<~EOL.freeze
Avoid using `@value ||= query` inside predicate methods in order to
properly memoize `false` or `nil` values.
https://docs.gitlab.com/ee/development/utilities.html#strongmemoize
EOL
def on_def(node)
return unless predicate_method?(node)
select_offenses(node).each do |offense|
add_offense(offense, location: :expression)
end
end
private
def predicate_method?(node)
node.method_name.to_s.end_with?('?')
end
def or_ivar_assignment?(or_assignment)
lhs = or_assignment.each_child_node.first
lhs.ivasgn_type?
end
def select_offenses(node)
node.each_descendant(:or_asgn).select do |or_assignment|
or_ivar_assignment?(or_assignment)
end
end
end
end
end
end
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