class ActiveSupport::Cache::FileStore

def decrement(name, amount = 1, **options)


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

To set a specific value, call #write:

cache.decrement("foo") # => -1

If the key is unset, it will be set to +-amount+.

Decrement a cached integer value. Returns the updated value.
def decrement(name, amount = 1, **options)
  options = merged_options(options)
  key = normalize_key(name, options)
  instrument(:decrement, key, amount: amount) do
    modify_value(name, -amount, options)
  end
end