# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 14 def dirties_query_cache(base, *method_names) method_names.each do |method_name| base.class_eval def #{method_name}_with_query_dirty(*args) # def update_with_query_dirty(*args) clear_query_cache if @query_cache_enabled # clear_query_cache if @query_cache_enabled #{method_name}_without_query_dirty(*args) # update_without_query_dirty(*args) end # end # alias_method_chain :#{method_name}, :query_dirty # alias_method_chain :update, :query_dirty, __FILE__, __LINE__ + 1 end end
Enable the query cache within the block.
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 31 def cache old, @query_cache_enabled = @query_cache_enabled, true @query_cache ||= {} 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 54 def clear_query_cache @query_cache.clear if @query_cache end
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 66 def columns_with_query_cache(*args) if @query_cache_enabled @query_cache["SHOW FIELDS FROM #{args.first}"] ||= columns_without_query_cache(*args) else columns_without_query_cache(*args) end end
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 58 def select_all_with_query_cache(*args) if @query_cache_enabled cache_sql(args.first) { select_all_without_query_cache(*args) } else select_all_without_query_cache(*args) end end
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