问题
I have two models:
User
has_one :email
belongs_to :user
I put the email_id foreign key (NOT NULL) inside users table. Now I'm trying to save it in the following way:
@email = Email.new(params[:email])
@email.user = User.new(params[:user])
@email.save
This raises a db exception, because the foreign key constraint is not met (NULL is inserted into email_id). How can I elegantly solve this or is my data modeling wrong?
回答1:
This should work as expected.
@email = Email.create(params[:email])
@email.user.create(params[:user])
回答2:
Hum... Do you have
has_one :email
in your user model?
If it's the case, I think there is a problem. You should use has_one in the user model if it's the email table that has the foreign_key.
You should have a user_id column in the email table I think.
来源：https://stackoverflow.com/questions/4912154/how-to-save-related-models-with-non-null-foreign-key