UnknownAttributeError for nested form

Question

I have two model as:

Customer:

has_many :products, :dependent => :destroy
accepts_nested_attributes_for :products, reject_if: proc { |attributes| attributes['product_id'].blank? }

Product:

belongs_to :customer

products controller:

def product_params
    params.require(:product).permit(:name, :first_build)
end

customers controller:

    def customer_params
        params.require(:customer).permit(:first_build, :name, :product_id, 
                                  products_attributes: [:first_build, :customer_id])
    end

So in the customers controller I do this

@customer.products.build(:first_build => true)

but I get this error

unknown attribute 'first_build' for Prodcut

but when I do this @customer.products.build(:name => "test product name")

it works perfectly without any error. One thing to note here, first_build is not a column in the products table.

I assume you meant to type Product not Prodcut... but if first_build is not an attribute (not a column) why are you passing it? — SteveTurczyn
– SteveTurczyn, Commented Apr 18, 2016 at 11:45
Yes it is Product. I just want to know if it is possible to pass attributes that are not in the table. — user1670773
– user1670773, Commented Apr 18, 2016 at 12:44

Shiva · Accepted Answer · 2016-04-18 13:31:06Z

1

If you want to pass attributes that are not in the table, you can create a "temporary" attribute which will not be stored in the table but will be available while the object is in memory.

class Product < ActiveRecord::Base

  attr_accessor :first_build
  ...

end

edited Apr 18, 2016 at 13:31

Shiva

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answered Apr 18, 2016 at 13:18

SteveTurczyn

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