How to make fields associated with a belongs_to association optional?

Question

Ruby on Rails

Good evening
. I have several columns in the model associated with the belongs_to association, in which I need to insert the id of another object.

class FirstModel < ApplicationRecord
belongs_to :secondmodel_object_a
belongs_to :secondmodel_object_b
belongs_to :secondmodel_object_c

The form is

<p>@firstmodel.title</p>
<p>@firstmodel.secondmodel_object_a</p>
<p>@firstmodel.secondmodel_object_b</p>
<p>@firstmodel.secondmodel_object_c</p>

First I want to save with title and secondmodel_object_a fields filled in. But the transaction is rolled back because secondmodel_object_b and secondmodel_object_c are not filled.
Tell me how this issue is resolved?

Answer 1

belongs_to :secondmodel_object_b, optional: true
belongs_to :secondmodel_object_c, optional: true