Has_one through and accepts_nested_attributes_for

I am trying to create a form to edit an object 2 associated with a has_one relationship via:

bank_acount.rb

class BankAccount < ActiveRecord::Base
  belongs_to :user, inverse_of: :bank_account
  has_one :personal_information, through: :user
  accepts_nested_attributes_for :personal_information
  accepts_nested_attributes_for :user
  #...
end

      

        
        
        
      

    

personal_information.rb

class PersonalInformation < ActiveRecord::Base
  belongs_to :user, inverse_of: :personal_information
  #...
end

      

        
        
        
      

    

user.rb

class User < ActiveRecord::Base
  has_one :personal_information, inverse_of: :user
  has_one :bank_account, inverse_of: :user
  accepts_nested_attributes_for :personal_information
  #...
end

      

        
        
        
      

    

When I try to submit my form (here is a test to emulate this)

bank_account.update({:iban => 'XXX', :bic => 'XXX', personal_information_attributes: {
    first_name: 'first name',
    last_name: 'last name',
    address: 'address',
    zip: 'zip',
    city: 'city'
}})

      

        
        
        
      

    

I am getting this error:

ArgumentError: Cannot build association `personal_information'. Are you trying to build a polymorphic one-to-one association?

      

        
        
        
      

    

I don't do anything with polymorphic things and I don't know where this error comes from.

Any idea?