method

decrement

v7.1.3.4 - Show latest stable - 0 notes - Class: ActiveSupport::Cache::MemCacheStore

decrement(name, amount = 1, options = nil) public

Decrement a cached integer value using the memcached decr atomic operator. Returns the updated value.

If the key is unset or has expired, it will be set to 0. Memcached does not support negative counters.

cache.decrement("foo") # => 0

To set a specific value, call #write passing raw: true:

cache.write("baz", 5, raw: true)
cache.decrement("baz") # => 4

Decrementing a non-numeric value, or a value written without raw: true, will fail and return nil.

Show source

# File activesupport/lib/active_support/cache/mem_cache_store.rb, line 204
      def decrement(name, amount = 1, options = nil)
        options = merged_options(options)
        instrument(:decrement, name, amount: amount) do
          rescue_error_with nil do
            @data.with { |c| c.decr(normalize_key(name, options), amount, options[:expires_in], 0) }
          end
        end
      end

decrement

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