Rails 5 belongs_to association must exist

Question

I created a

Rails

API project and for some reason I'm facing an issue with

belongs_to

associtation in Rails 5.

The problem is that I can't save the object

User

if I set

belongs_to

in Model.

Schema:

class CreateUsers < ActiveRecord::Migration[5.0]

  def change

    create_table :users do |t|

      t.string :email, null: false

      t.string :encrypted_password, null: false

      t.string :description

      t.string :avatar, null: false

      t.integer :role_id, null: false    



      t.timestamps null: false

    end



    add_foreign_key :users, :roles

  end

end



class CreateRoles < ActiveRecord::Migration[5.0]

  def change

    create_table :roles do |t|

      t.string :name, null: false

      t.text :description



      t.timestamps null: false

    end

  end

end

Models:

class User < ApplicationRecord

  before_create :set_default

  belongs_to :role



  private

    def set_default

      # self.role ||= Role.find_by(name: 'Client') 

      self.avatar = 'test'

    end

end



class Role < ApplicationRecord

  has_many :users

end

I'm trying to save a simple

object

like this:

{

  "email": "[email protected]",

  "description": "testDesc",

  "password": "12345678",

  "password_confirmation": "12345678",

  "role_id": 3

}

However I can't because I always receive the following error:

Note: If I remove the

belongs_to

of

users

it works, however if I do it I can't access the

object

role

in another actions.

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Answer 1

In Rails 5 a belongs_to association is required to have the associated record present by default.

https://github.com/rails/rails/pull/18937

You can pass optional: true to the belongs_to association which would remove this validation check.

class User < ApplicationRecord
  before_create :set_default
  belongs_to :role, optional: true
  ...

Rails 5 belongs_to association must exist

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