Question

I have a User model which has_one Post model, which belongs_to User. Through a before_save callback, I want to create an (actually multiple, but this is another question) empty (or better, default like saying “This is my first post”) Post, whenever a new user signs up. But the function below:

def create_post
  @post = Post.new(params[:post])
  @post.user = self
  @post.save

gives an error:

undefined local variable or method `params’ for #

What might the problem be?

Answer 1

You don’t have access to the params hash in the model.

You don’t want to do this in an after_save callback, but in a after_create or before_create I’d say.

Also, I don’t understand why a User has_one Post… especially if you want to create several.

In the callback:

• if a user has_one :post

  self.create_post(default_values_hash)

• if has_many :posts

  self.posts.create(default_values_hash)