module ActiveRecord::ConnectionAdapters::QueryCache

Attributes

query_cache[RW]

Public Class Methods

dirties_query_cache(base, *method_names) Show source

# 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(*) Show source

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

Calls superclass method

Public Instance Methods

cache(&block) Show source

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

Enable the query cache within the block.

clear_query_cache() Show source

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

disable_query_cache!() Show source

# 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!() Show source

# 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() Show source

# 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) Show source

# 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

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.)