# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 11 11: def dirties_query_cache(base, *method_names) 12: method_names.each do |method_name| 13: 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 14: end 15: end
Enable the query cache within the block.
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 26 26: def cache 27: old, @query_cache_enabled = @query_cache_enabled, true 28: yield 29: ensure 30: clear_query_cache 31: @query_cache_enabled = old 32: 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 48: def clear_query_cache 49: @query_cache.clear 50: end
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 61 61: def cache_sql(sql) 62: result = 63: if @query_cache.has_key?(sql) 64: ActiveSupport::Notifications.instrument("sql.active_record", 65: :sql => sql, :name => "CACHE", :connection_id => self.object_id) 66: @query_cache[sql] 67: else 68: @query_cache[sql] = yield 69: end 70: 71: if Array === result 72: result.collect { |row| row.dup } 73: else 74: result.duplicable? ? result.dup : result 75: end 76: rescue TypeError 77: result 78: end
Disabled; run with --debug to generate this.
Generated with the Darkfish Rdoc Generator 1.1.6.