diff options
Diffstat (limited to 'activerecord/lib')
| -rw-r--r-- | activerecord/lib/active_record/explain.rb | 13 | ||||
| -rw-r--r-- | activerecord/lib/active_record/railtie.rb | 7 |
2 files changed, 14 insertions, 6 deletions
diff --git a/activerecord/lib/active_record/explain.rb b/activerecord/lib/active_record/explain.rb index af772996f1..70683eb731 100644 --- a/activerecord/lib/active_record/explain.rb +++ b/activerecord/lib/active_record/explain.rb @@ -6,11 +6,12 @@ module ActiveRecord base.mattr_accessor :auto_explain_threshold_in_seconds, instance_accessor: false end - # If auto explain is enabled, this method triggers EXPLAIN logging for the - # queries triggered by the block if it takes more than the threshold as a - # whole. That is, the threshold is not checked against each individual - # query, but against the duration of the entire block. This approach is - # convenient for relations. + # If the database adapter supports explain and auto explain is enabled, + # this method triggers EXPLAIN logging for the queries triggered by the + # block if it takes more than the threshold as a whole. That is, the + # threshold is not checked against each individual query, but against the + # duration of the entire block. This approach is convenient for relations. + # # The available_queries_for_explain thread variable collects the queries # to be explained. If the value is nil, it means queries are not being @@ -21,7 +22,7 @@ module ActiveRecord threshold = auto_explain_threshold_in_seconds current = Thread.current - if threshold && current[:available_queries_for_explain].nil? + if connection.supports_explain? && threshold && current[:available_queries_for_explain].nil? begin queries = current[:available_queries_for_explain] = [] start = Time.now diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb index 5464ca6066..a73473f59c 100644 --- a/activerecord/lib/active_record/railtie.rb +++ b/activerecord/lib/active_record/railtie.rb @@ -136,6 +136,13 @@ module ActiveRecord end end + initializer "active_record.validate_explain_support" do |app| + if app.config.active_record[:auto_explain_threshold_in_seconds] && + !ActiveRecord::Base.connection.supports_explain? + warn "auto_explain_threshold_in_seconds is set but will be ignored because your adapter does not support this feature. Please unset the configuration to avoid this warning." + end + end + # Expose database runtime to controller for logging. initializer "active_record.log_runtime" do |app| require "active_record/railties/controller_runtime" |