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require 'active_support/notifications'
module ActiveRecord
class ExplainSubscriber # :nodoc:
def start(name, id, payload)
# unused
end
def finish(name, id, payload)
if queries = Thread.current[:available_queries_for_explain]
queries << payload.values_at(:sql, :binds) unless ignore_payload?(payload)
end
end
# SCHEMA queries cannot be EXPLAINed, also we do not want to run EXPLAIN on
# our own EXPLAINs now matter how loopingly beautiful that would be.
#
# On the other hand, we want to monitor the performance of our real database
# queries, not the performance of the access to the query cache.
IGNORED_PAYLOADS = %w(SCHEMA EXPLAIN CACHE)
EXPLAINED_SQLS = /\A\s*(select|update|delete|insert)/i
def ignore_payload?(payload)
payload[:exception] || IGNORED_PAYLOADS.include?(payload[:name]) || payload[:sql] !~ EXPLAINED_SQLS
end
ActiveSupport::Notifications.subscribe("sql.active_record", new)
end
end
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