Method: Sohm::Model.counter

Defined in:
lib/sohm.rb

.counter(name) ⇒ Object

Declare a counter. All the counters are internally stored in a different Redis hash, independent from the one that stores the model attributes. Counters are updated with the ‘incr` and `decr` methods, which interact directly with Redis. Their value can’t be assigned as with regular attributes.

Example:

class User < Sohm::Model
  counter :points
end

u = User.create
u.incr :points

u.points
# => 1

Note: You can’t use counters until you save the model. If you try to do it, you’ll receive an Sohm::MissingID error.



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# File 'lib/sohm.rb', line 883

def self.counter(name)
  counters << name unless counters.include?(name)

  define_method(name) do
    return 0 if new?

    redis.call("HGET", key[:_counters], name).to_i
  end
end