module ActiveRecord::ConnectionAdapters::QueryCache

Attributes

Public Class Methods

dirties_query_cache (base, *method_names)

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 20
        def dirties_query_cache(base, *method_names)
          method_names.each do |method_name|
            base.class_eval <<-end_code, __FILE__, __LINE__ + 1
              def #{method_name}(...)
                if pool.dirties_query_cache
                  ActiveRecord::Base.clear_query_caches_for_current_thread
                end
                super
              end
            end_code
          end
        end

new (*)

Calls superclass method

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 196
def initialize(*)
  super
  @query_cache = nil
end

Public Instance Methods

cache (&block)

Enable the query cache within the block.

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 206
def cache(&block)
  pool.enable_query_cache(&block)
end

clear_query_cache ()

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 activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 232
def clear_query_cache
  pool.clear_query_cache
end

disable_query_cache! ()

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 222
def disable_query_cache!
  pool.disable_query_cache!
end

enable_query_cache! ()

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 210
def enable_query_cache!
  pool.enable_query_cache!
end

query_cache_enabled ()

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 201
def query_cache_enabled
  @query_cache&.enabled?
end

uncached (dirties: true, &block)

Disable the query cache within the block.

Set dirties: false to prevent query caches on all connections from being cleared by write operations. (By default, write operations dirty all connections’ query caches in case they are replicas whose cache would now be outdated.)

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 218
def uncached(dirties: true, &block)
  pool.disable_query_cache(dirties: dirties, &block)
end