diff options
| -rw-r--r-- | activerecord/lib/active_record/explain_subscriber.rb | 5 | ||||
| -rw-r--r-- | activerecord/test/cases/explain_subscriber_test.rb | 48 |
2 files changed, 52 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/explain_subscriber.rb b/activerecord/lib/active_record/explain_subscriber.rb index fc76410499..1f8c4fc203 100644 --- a/activerecord/lib/active_record/explain_subscriber.rb +++ b/activerecord/lib/active_record/explain_subscriber.rb @@ -11,7 +11,10 @@ module ActiveRecord # 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. - IGNORED_PAYLOADS = %w(SCHEMA EXPLAIN) + # + # 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) def ignore_payload?(payload) payload[:exception] || IGNORED_PAYLOADS.include?(payload[:name]) end diff --git a/activerecord/test/cases/explain_subscriber_test.rb b/activerecord/test/cases/explain_subscriber_test.rb new file mode 100644 index 0000000000..e118add44c --- /dev/null +++ b/activerecord/test/cases/explain_subscriber_test.rb @@ -0,0 +1,48 @@ +require 'cases/helper' + +if ActiveRecord::Base.connection.supports_explain? + class ExplainSubscriberTest < ActiveRecord::TestCase + SUBSCRIBER = ActiveRecord::ExplainSubscriber.new + + def test_collects_nothing_if_available_queries_for_explain_is_nil + with_queries(nil) do + SUBSCRIBER.call + assert_nil Thread.current[:available_queries_for_explain] + end + end + + def test_collects_nothing_if_the_payload_has_an_exception + with_queries([]) do |queries| + SUBSCRIBER.call(:exception => Exception.new) + assert queries.empty? + end + end + + def test_collects_nothing_for_ignored_payloads + with_queries([]) do |queries| + ActiveRecord::ExplainSubscriber::IGNORED_PAYLOADS.each do |ip| + SUBSCRIBER.call(:name => ip) + end + assert queries.empty? + end + end + + def test_collects_pairs_of_queries_and_binds + sql = 'select 1 from users' + binds = [1, 2] + with_queries([]) do |queries| + SUBSCRIBER.call(:name => 'SQL', :sql => sql, :binds => binds) + assert_equal 1, queries.size + assert_equal sql, queries[0][0] + assert_equal binds, queries[0][1] + end + end + + def with_queries(queries) + Thread.current[:available_queries_for_explain] = queries + yield queries + ensure + Thread.current[:available_queries_for_explain] = nil + end + end +end
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