Creating current variables in Rails 4

Question

I am a rookie in Rails. I am using Rails 4 and I could not find how they do this or what it is called.

I got this idea from devise where you can use devise and implement such thing in your application.html.erb file:

<% if user_signed_in? %>
      Logged in as <strong><%= current_user.email %></strong>.

Where user is the devise model. However when I try to search for user_signed_in or current_user variable, I cannot find it at all!

So essentially what I want to do is link this user model (which is used for devise) with another model that I created called profile. These models are linked by their ids, and if user has not created a profile, then simply ask user to create his/her profile. To do that, I've written this to application.html.erb:

<% if user_signed_in? && (current_profile.id != current_user.id)? %>
    <%= link_to 'You have not created your profile! Please create your profile first.', update_profile_index_path, :class => 'navbar-link'  %>
<% else %>
    <%= yield %>
<% end %>

Which does not work as expected because I have not defined current_profile. The error that I am getting is:

undefined local variable or method `current_profile' for #<#<Class:0x000000044d6c60>:0x00000005d64110>

My question is, how do I create a variable named current_profile that would contain the current profile, like current_user that devise does?

if you define has_one profile on the user model, then current_user.profile will work — Rafal
– Rafal, Commented Aug 27, 2014 at 13:22
I already did that for both and it doesn't work. I am getting undefined method `profile?' for #<User:0x00000002f82c88> error if I do that — Sarp Kaya
– Sarp Kaya, Commented Aug 27, 2014 at 13:22
then you need to define def profile?; return self.profile; end on your User model — Rafal
– Rafal, Commented Aug 27, 2014 at 13:23

Rafal · Accepted Answer · 2014-08-27 13:26:17Z

3

The usual setup for this is to add a Profile model with a user_id:integer field.

Define an assocition on the User model

has_one :profile

Then you can access it directly using

current_user.profile

answered Aug 27, 2014 at 13:26

Rafal

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MrYoshiji · Accepted Answer · 2014-08-27 13:56:07Z

3

You can do the following:

class User
  has_one :profile
  # ...

class Profile
  belongs_to :user
  # ...

module ApplicationHelper # app/helpers/application_helper.rb
  def current_profile
    @current_profile ||= current_user.try(:profile)
    @current_profile
  end
  # ...

# view
<% if user_signed_in? && current_profile.blank? %>
  <%= link_to 'You have not created your profile! Please create your profile first.', update_profile_index_path, :class => 'navbar-link'  %>
<% else %>
  <%= yield %>
<% end %>

edited Aug 27, 2014 at 13:56

answered Aug 27, 2014 at 13:30

MrYoshiji

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11 Comments

Sarp Kaya Over a year ago

I have has_one in Profile as well because I want to strict that one profile has only one user?

Stefan Over a year ago

@SarpKaya see Choosing Between belongs_to and has_one

Sarp Kaya Over a year ago

It worked like a charm! And this kind of thing was what I was wanting at the first place!

Stefan Over a year ago

@SarpKaya where do you store the foreign key - is there a profile_id field in your users table or a user_id field in your profiles table?

MrYoshiji Over a year ago

The model holding the belongs_to :something part is the model that holds the column something_id. In your case User has_one :profile and Profile belongs_to :user

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