method

logging_query_plan

v3.2.1 - Show latest stable - Class: ActiveRecord::Explain

logging_query_plan()

public

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.

The available_queries_for_explain thread variable collects the queries to be explained. If the value is nil, it means queries are not being currently collected. A false value indicates collecting is turned off. Otherwise it is an array of queries.

# File activerecord/lib/active_record/explain.rb, line 24
    def logging_query_plan # :nodoc:
      return yield unless logger

      threshold = auto_explain_threshold_in_seconds
      current   = Thread.current
      if threshold && current[:available_queries_for_explain].nil?
        begin
          queries = current[:available_queries_for_explain] = []
          start = Time.now
          result = yield
          logger.warn(exec_explain(queries)) if Time.now - start > threshold
          result
        ensure
          current[:available_queries_for_explain] = nil
        end
      else
        yield
      end
    end

logging_query_plan

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