gistfile1.rb

class DynamicForm < ActiveRecord::Base
  ....
  has_many :field_definitions, :dependent => :destroy
  
  def build_field_definitions(definitions)
    JSON.parse(definitions).each do |definition|
      puts definition.class
      self.field_definitions << FieldDefinition.new(extract_field_definition(definition))
    end
  end
  
  def extract_field_definition(definition)
    definition = definition.symbolize_keys
    {
      :field_name => definition[:name],
      :label => definition[:fieldLabel],
      :data_type => DataType.find_by_description(definition[:xtype]) 
    }
  end
end

#dynamic_form_spec

 it "should save field definitions while saving form" do
 
    field_definitions = "[{\"xtype\":\"textfield\",\"name\":\"Email\",\"fieldLabel\":\"Email\",\"display_in_grid\":true,\"searchable\":true,\"labelWidth\":75,\"validator_function\":\"validateEmail(v)\"},{\"xtype\":\"textfield\",\"name\":\"Name\",\"fieldLabel\":\"Name\",\"display_in_grid\":true,\"searchable\":true,\"labelWidth\":75},{\"xtype\":\"checkbox\",\"name\":\"Admin\",\"fieldLabel\":\"Admin\",\"display_in_grid\":true,\"searchable\":true,\"labelWidth\":75,\"inputValue\":true,\"uncheckedValue\":false},{\"xtype\":\"numberfield\",\"name\":\"Age\",\"fieldLabel\":\"Age\",\"display_in_grid\":true,\"searchable\":true,\"labelWidth\":75}]"
    
    dynamic_form = DynamicForm.new(:model_name => "Test")
    dynamic_form.stub!(:default_form_check).and_return("something")
    dynamic_form.build_field_definitions(field_definitions)
    dynamic_form.save.should eq true
    dynamic_form.field_definitions.first.should be_an_instance_of(FieldDefinition)
  end