ActiveRecord::ConnectionAdapters::QueryCache

Methods

cache
clear_query_cache
dirties_query_cache
disable_query_cache!
enable_query_cache!
new
query_cache_enabled
uncached

Attributes

[RW]

query_cache

Class Public methods

dirties_query_cache(base, *method_names)

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 19
        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

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new(*)

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 167
      def initialize(*)
        super
        @query_cache = nil
      end

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Instance Public methods

cache(&block)

Enable the query cache within the block.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 177
      def cache(&block)
        pool.enable_query_cache(&block)
      end

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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.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 203
      def clear_query_cache
        pool.clear_query_cache
      end

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disable_query_cache!()

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 193
      def disable_query_cache!
        pool.disable_query_cache!
      end

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enable_query_cache!()

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 181
      def enable_query_cache!
        pool.enable_query_cache!
      end

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query_cache_enabled()

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 172
      def query_cache_enabled
        @query_cache&.enabled?
      end

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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.)

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 189
      def uncached(dirties: true, &block)
        pool.disable_query_cache(dirties: dirties, &block)
      end

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