Contents

module SimpleShipping
# Base class for all simple shipping models.
  class Abstract::Model
    include ActiveModel::Validations

    # hash with default attribute values
    class_attribute :default_values

    # Define the default values of the attributes which should be set when the model is created.
    def self.set_default_values(values = {})
      self.default_values = values 
    end

    # Add a validation callback to validate the submodel. Submodel is a model
    # which belongs to current model.
    # == Parameters:
    # * name - name of attribute which is submodel
    # * opts - hash with only on key :as. It should points to class of submodel.
    def self.validates_submodel(name, opts = {})
      validate do
        klass = opts[:as] || raise(":as option should be passed")
        submodel = send(name)
        if !submodel.instance_of?(klass)
          errors.add(name.to_sym, "must be an instance of #{klass.inspect}") 
        elsif submodel.invalid?
          errors.add(name.to_sym, "is invalid")
        end
      end
    end

    # Create a new model and set the default and passed values.
    def initialize(values = {})
      values.reverse_merge!(default_values || {})
      values.each do |attribute, value|
        raise("Undefined attribute `#{attribute}` for #{self}") unless respond_to?(attribute)
        send("#{attribute}=", value)
      end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
simple_shipping-0.4.7	lib/simple_shipping/abstract/model.rb
simple_shipping-0.4.6	lib/simple_shipping/abstract/model.rb