Mongoid multiple has_one relations

Question

I struggling to get these relationships to work. I have the following class FlowContainer

class FlowContainer
  include Mongoid::Document
  has_one :production_flow, class_name: Flow
  has_one :test_flow, class_name: Flow
  has_one :design_flow, class_name: Flow
end

As you can see I want it to have 3 specific flows. And I setup the relationship in the Flow like this:

class Flow
  include Mongoid::Document
  belongs_to :flow_container
end

I don't think this is something special and should work in my opinion but when I try to assign a flow to one of the specific flows mentioned above I get this error message:

NoMethodError: undefined method `sub' for Flow:Class

I could also go for the inheritance setup for a generic flow and 3 sub class but for the moment I'm not in favor for that solution because I feel this should work. If somebody could share his opinion on this matter, I would appreciate it.

Answer 1

The class_name must be pass as an string, try this:

has_one :test_flow, class_name: "Flow"