बस अपने मॉडल में कुछ इस तरह शामिल करें:
module DynamicAttributeSupport
def self.included(base)
base.send :include, InstanceMethods
end
module InstanceMethods
def dynamic_attributes
attributes.keys - _protected_attributes[:default].to_a - fields.keys
end
def static_attributes
fields.keys - dynamic_attributes
end
end
end
और यहाँ इसके साथ जाने के लिए एक युक्ति है:
require 'spec_helper'
describe "dynamic attributes" do
class DynamicAttributeModel
include Mongoid::Document
include DynamicAttributeSupport
field :defined_field, type: String
end
it "provides dynamic_attribute helper" do
d = DynamicAttributeModel.new(age: 45, defined_field: 'George')
d.dynamic_attributes.should == ['age']
end
it "has static attributes" do
d = DynamicAttributeModel.new(foo: 'bar')
d.static_attributes.should include('defined_field')
d.static_attributes.should_not include('foo')
end
it "allows creation with dynamic attributes" do
d = DynamicAttributeModel.create(age: 99, blood_type: 'A')
d = DynamicAttributeModel.find(d.id)
d.age.should == 99
d.blood_type.should == 'A'
d.dynamic_attributes.should == ['age', 'blood_type']
end
end