Rails - Show all models that belongs_to this User

Question

If I have a User that has_many :problems, assuming I have set up the necessary association between User and Problem , how can I do something like:

  # UsersController.rb
  def students_problems
     @userId = params[:user_id]
     @problems = give me all problems associated with this @userId
  end

Answer 1

@user = User.find(params[:user_id])

@problems = @user.problems

Ideally you would want to do this in a model if you plan to do more with your code. So you can create a model method like this for your controller.

@problems = User.name_your_method_here(params[:user_id])

Then in your User model you have

self.name_your_method_here(user_id)
  User.find(user_id).problems
end

And you might want to add some conditionals to make sure the user_id matches a real user but I'll leave that up to you to do.

EDIT: As lebreeze suggests, it might be wise to change the name of the method to something different, at least to what it relates with what you're doing with your code.