Rails: Associate posts with user and location

问题

I have a Post model in my app, which belongs_toa User model, as well as a Location model. Both the User and Location models use the has_many relation with Post.

Now, in my Post controller's create action, I want to automatically associate the Post with the currently logged in user (available to me as current_user through Devise).

Also, it should associate with a pre-existing Location if one exists with the same address field (which he enters through the form), or create a new one and associate it with that if not.

My Post model has a user_id field as well a location_id field for this purpose.

How do I accomplish the two associations automatically in the create action when the user creates a new Post?

回答1:

You'll need to use 2 statements.

@post = current_user.posts.build(params[:post])
@post.location_id = params[:location_id] # change this to whatever you're passing.
@post.save

来源：https://stackoverflow.com/questions/6983244/rails-associate-posts-with-user-and-location