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# frozen_string_literal: true
module ActiveRecord
class Relation
module RecordFetchWarning
# When this module is prepended to ActiveRecord::Relation and
# +config.active_record.warn_on_records_fetched_greater_than+ is
# set to an integer, if the number of records a query returns is
# greater than the value of +warn_on_records_fetched_greater_than+,
# a warning is logged. This allows for the detection of queries that
# return a large number of records, which could cause memory bloat.
#
# In most cases, fetching large number of records can be performed
# efficiently using the ActiveRecord::Batches methods.
# See ActiveRecord::Batches for more information.
def exec_queries
QueryRegistry.reset
super.tap do
if logger && warn_on_records_fetched_greater_than
if @records.length > warn_on_records_fetched_greater_than
logger.warn "Query fetched #{@records.size} #{@klass} records: #{QueryRegistry.queries.join(";")}"
end
end
end
end
# :stopdoc:
ActiveSupport::Notifications.subscribe("sql.active_record") do |*, payload|
QueryRegistry.queries << payload[:sql]
end
# :startdoc:
class QueryRegistry # :nodoc:
extend ActiveSupport::PerThreadRegistry
attr_reader :queries
def initialize
@queries = []
end
def reset
@queries.clear
end
end
end
end
end
ActiveRecord::Relation.prepend ActiveRecord::Relation::RecordFetchWarning
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