Module: EavPresenter::ClassMethods

Defined in:
lib/eav_presenter.rb

Instance Method Summary collapse

Instance Method Details

#eav(opts) ⇒ Object 



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# File 'lib/eav_presenter.rb', line 56

def eav(opts)
  @eav_attr_class = opts[:eav_attr_class]
  @eav_value_class = opts[:eav_value_class]
  @eav_entity_foreign_key = opts[:eav_entity_foreign_key]
  @eav_attr_foreign_key = opts[:eav_attr_foreign_key]
  @eav_attrs = @eav_attr_class.all
  
  define_method(:attributes) {
   super.merge(Hash[self.class.instance_variable_get("@eav_attrs").map(&:eav_attr_name).map { |name| [name, send(name)] }])
  }
  # define_attribute_methods(@eav_attrs.collect(&:eav_attr_name))
  
  @eav_attrs.each { |at|
    define_method(at.eav_attr_name) { |*args|
      eavs = load_eav_attr_values_if_not_loaded
      if instance_variables.collect(&:to_s).include?("@#{at.eav_attr_name}")
        instance_variable_get("@#{at.eav_attr_name}")
      else
        eavs.find { |i| i.send(self.class.instance_variable_get("@eav_attr_foreign_key")) == at.id }.try(:value)
      end
    }

    define_method("#{at.eav_attr_name}=") { |value|
      # raise "EAV value for #{at.eav_attr_name} must be a string or nil" unless value.nil? || value.is_a?(String)
      eavs = load_eav_attr_values_if_not_loaded
      instance_variable_set("@#{at.eav_attr_name}",value)
      old = eavs.find { |i| i.send(self.class.instance_variable_get("@eav_attr_foreign_key")) == at.id }.try(:value)
      if value.to_s == old.to_s # to consider nil and blank as same
        changed_attributes.delete(at.eav_attr_name)
      else
        changed_attributes[at.eav_attr_name] = old
      end
    }
  }
  after_save :save_eav_attr_values # Register a callback which makes sure that any changes made are sync'ed to the AttrValues table
  after_find :load_eav_attr_values_if_not_loaded
end