require 'active_support/lazy_load_hooks' module ActiveRecord module Explain # Relation#explain needs to be able to collect the queries. def collecting_queries_for_explain # :nodoc: current = Thread.current original, current[:available_queries_for_explain] = current[:available_queries_for_explain], [] return yield, current[:available_queries_for_explain] ensure # Note that the return value above does not depend on this assigment. current[:available_queries_for_explain] = original end # Makes the adapter execute EXPLAIN for the tuples of queries and bindings. # Returns a formatted string ready to be logged. def exec_explain(queries) # :nodoc: str = queries && queries.map do |sql, bind| [].tap do |msg| msg << "EXPLAIN for: #{sql}" unless bind.empty? bind_msg = bind.map {|col, val| [col.name, val]}.inspect msg.last << " #{bind_msg}" end msg << connection.explain(sql, bind) end.join("\n") end.join("\n") # Overriding inspect to be more human readable, specially in the console. def str.inspect self end str end end end