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module ActiveRecord
class QueryRecorder
attr_reader :log, :cached
def initialize(&block)
@log = []
@cached = []
ActiveSupport::Notifications.subscribed(method(:callback), 'sql.active_record', &block)
end
def show_backtrace(values)
Rails.logger.debug("QueryRecorder SQL: #{values[:sql]}")
caller.each { |line| Rails.logger.debug(" --> #{line}") }
end
def callback(name, start, finish, message_id, values)
show_backtrace(values) if ENV['QUERY_RECORDER_DEBUG']
if values[:name]&.include?("CACHE")
@cached << values[:sql]
elsif !values[:name]&.include?("SCHEMA")
@log << values[:sql]
end
end
def count
@log.count
end
def cached_count
@cached.count
end
def log_message
@log.join("\n\n")
end
end
end
RSpec::Matchers.define :exceed_query_limit do |expected|
supports_block_expectations
match do |block|
query_count(&block) > expected_count + threshold
end
failure_message_when_negated do |actual|
threshold_message = threshold > 0 ? " (+#{@threshold})" : ''
counts = "#{expected_count}#{threshold_message}"
"Expected a maximum of #{counts} queries, got #{actual_count}:\n\n#{log_message}"
end
def with_threshold(threshold)
@threshold = threshold
self
end
def threshold
@threshold.to_i
end
def expected_count
if expected.is_a?(ActiveRecord::QueryRecorder)
expected.count
else
expected
end
end
def actual_count
@recorder.count
end
def query_count(&block)
@recorder = ActiveRecord::QueryRecorder.new(&block)
@recorder.count
end
def count_queries(queries)
queries.each_with_object(Hash.new(0)) { |query, counts| counts[query] += 1 }
end
def log_message
if expected.is_a?(ActiveRecord::QueryRecorder)
counts = count_queries(expected.log)
extra_queries = @recorder.log.reject { |query| counts[query] -= 1 unless counts[query].zero? }
extra_queries_display = count_queries(extra_queries).map { |query, count| "[#{count}] #{query}" }
(['Extra queries:'] + extra_queries_display).join("\n\n")
else
@recorder.log_message
end
end
end
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