Method: Sohm::Model.attribute

Defined in:
lib/sohm.rb

.attribute(name, cast = nil) ⇒ Object

The bread and butter macro of all models. Basically declares persisted attributes. All attributes are stored on the Redis hash.

class User < Sohm::Model
  attribute :name
end

user = User.new(name: "John")
user.name
# => "John"

user.name = "Jane"
user.name
# => "Jane"

A lambda can be passed as a second parameter to add typecasting support to the attribute.

class User < Sohm::Model
  attribute :age, ->(x) { x.to_i }
end

user = User.new(age: 100)

user.age
# => 100

user.age.kind_of?(Integer)
# => true

Check rubydoc.info/github/cyx/ohm-contrib#Ohm__DataTypes to see more examples about the typecasting feature.



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# File 'lib/sohm.rb', line 811

def self.attribute(name, cast = nil)
  if serial_attributes.include?(name)
    raise ArgumentError,
          "#{name} is already used as a serial attribute."
  end
  attributes << name unless attributes.include?(name)

  if cast
    define_method(name) do
      cast[@attributes[name]]
    end
  else
    define_method(name) do
      @attributes[name]
    end
  end

  define_method(:"#{name}=") do |value|
    @attributes[name] = value
  end
end