ruby on rails: undefined stringify_keys

Question

I'm learning to render forms from different controllers, but when I try to save data, it says that I get

NoMethodError in ProfilesController#create
undefined method `stringify_keys' for "2":String

My routes file:

resources :users do
  member do
   get 'profile'
  end
end

Profile model

belongs_to :user

User model

has_one :profile

views/profiles/_form.html.erb

<%= form_for [@user, @profile] do |f| %>
  ..
<% end %>

views/users/_form.html.erb

<%= render :partial => "profiles/form" %>

Also, to mention, when I tried to save the data, I get redirected to http://localhost:3000/users/2/profiles where the error occurs, instead of http://localhost:3000/users/2/profile notice the s in profile, it changes on me?

Thanks!

It's indicating that you have a nested resources route for profiles, but that's not showing in your routes. Have you posted the entire contents of your routes.rb? — zeantsoi
– zeantsoi, Commented Jun 17, 2013 at 5:01
In my experience every time I get the stringify keys error it has to do with a hash I'm passing into a method being constructed improperly. — Peter Berg
– Peter Berg, Commented Jun 18, 2013 at 4:42
@andrewliu, if you are rendering a partial from a partial, you should probably think about refactoring your code. — zeantsoi
– zeantsoi, Commented Jun 18, 2013 at 4:49

zeantsoi · Accepted Answer · 2013-06-18 05:01:37Z

1

I would take a slightly different approach. Rather than adding a GET member route for profile to the users resources route, I would nest a resource route for profile within your users route.

# config/routes.rb
resources :users do
    resource :profiles // notice the singular resource
end

This will provide the routes you need to RESTfully route to the nested profile resource.

Then you can create a form precisely as you've indicated:

# app/views/profiles/_form.html.erb
<%= form_for [@user, @profile] do |f| %>
    ...
<% end %>

In your ProfilesController, you can access the user in the following fashion:

# app/controllers/profiles_controller.rb
user = User.find(params[:user_id])
profile = user.profile

I'm not certain whether this will definitely resolve the error message you're receiving, but it very well might.

EDIT:

Regarding the comment below mentioning undefined method 'model_name' for NilClass:Class in your form: you're receiving this error because no variables are being passed to your partial scope. When rendering a partial, you need to pass in whatever local variables you'd like the partial to have access to:

# app/views/users/_form.html.erb
<%= render :partial => "profiles/form", :locals => {:user => @user, :profile => @profile} %>

Be cognizant, however, that the variables you pass to partial will only be accessible as local variables, not instance ones:

# app/views/profiles/_form.html.erb
<%= form_for [user, profile] do |f| %>
  ...
<% end %>

edited Jun 18, 2013 at 5:01

answered Jun 17, 2013 at 5:06

zeantsoi

26.3k7 gold badges71 silver badges61 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

hellomello Over a year ago

in which action do I put that code: user = User.find(params[:user_id])?

zeantsoi Over a year ago

Doesn't matter. Presumably, you are in either your new or update actions, but in either scenario, you'll be able to access user_id via params[:user_id].

hellomello Over a year ago

I get undefined method 'profiles' in my index action. I have this in it @user = User.find(params[:user_id]) and @profiles = @user.profiles

zeantsoi Over a year ago

Because User has_one Profile, you should use the singular of "profiles" when doing this lookup, i.e., @user.profile. I've amended my answer above to show an example.

hellomello Over a year ago

ahh good catch! but darn! I'm getting this error now: undefined method 'model_name' for NilClass:Class and its referring to the form in my views page, any idea what that is about? Thanks for the help!

|

Collectives™ on Stack Overflow

ruby on rails: undefined stringify_keys

1 Answer 1

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related