CODEWITHSUNDEEP
ruby-on-railsrubyactiverecordsingle-table-inheritance
Justus Eapen
Justus Eapen

Reputation: 1149

Rails STI Parent Model has_many expecting type on associated class?

Given a STI parent model 

class CustomForm < ApplicationRecord
has_many :templates` 
end

with a couple of subclasses that should have many templates. Why would the template class below: 

class FormTemplate < ApplicationRecord
belongs_to :custom_form

Why would Rails expect the FormTemplate to have a custom_form_type column defined?

All you need is the custom_form_id.

this was working before and even passes my CI but I did some other work that seems to have broken it :disappointed:

Here is the error:

PG::UndefinedColumn: ERROR:  column form_templates.custom_form_type does not exist
LINE 1: ...CT “form_templates”.* FROM “form_templates”

Upvotes: 0

Views: 155

Answers (1)

Pengcheng Zhou
Pengcheng Zhou

Reputation: 172

Because you didnt post all your code and the line of code caused this error. I will make a guess based on what you posted.

I think you added has_many :templates, as: :custom_form to one of the subclass of CustomForm. It defines [Polymorphic Associations]

In the CustomForm model has_many :templates`, it doesnt make sense to me, unless you have a templates model which is a subclass of FormTemplate

Upvotes: 1

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