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# frozen_string_literal: true
module Nplus1QueryHelpers
DEFAULT_THRESHOLD = 3
def with_threshold(threshold)
@threshold = threshold
self
end
def for_query(query)
@query = query
self
end
def threshold
@threshold || DEFAULT_THRESHOLD
end
def occurrences
@occurrences ||=
if @query
recorder.occurrences.select { |recorded, count| recorded =~ @query }
else
recorder.occurrences
end
end
def over_threshold
occurrences.select do |recorded, count|
count > threshold
end
end
def recorder
@recorder ||= ActiveRecord::QueryRecorder.new(&@subject_block)
end
def verify_count(&block)
@subject_block = block
over_threshold.present?
end
def failure_message
log_message = over_threshold.to_yaml
"The following queries are executed more than #{threshold} time(s):\n#{log_message}"
end
end
RSpec::Matchers.define :be_n_plus_1_query do
supports_block_expectations
include Nplus1QueryHelpers
match do |block|
verify_count(&block)
end
failure_message_when_negated do |actual|
failure_message
end
end
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