# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 11 def dirties_query_cache(base, *method_names) method_names.each do |method_name| base.class_eval " def #{method_name}(*) # def update_with_query_dirty(*args) clear_query_cache if @query_cache_enabled # clear_query_cache if @query_cache_enabled super # update_without_query_dirty(*args) end # end ", __FILE__, __LINE__ + 1 end end
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 7 def included(base) dirties_query_cache base, :insert, :update, :delete end
Enable the query cache within the block.
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 26 def cache old, @query_cache_enabled = @query_cache_enabled, true yield ensure clear_query_cache @query_cache_enabled = old end
Clears the query cache.
One reason you may wish to call this method explicitly is between queries that ask the database to randomize results. Otherwise the cache would see the same SQL query and repeatedly return the same result each time, silently undermining the randomness you were expecting.
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 48 def clear_query_cache @query_cache.clear end
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 52 def select_all(*args) if @query_cache_enabled cache_sql(args.first) { super } else super end end
Disable the query cache within the block.
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 35 def uncached old, @query_cache_enabled = @query_cache_enabled, false yield ensure @query_cache_enabled = old end