CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-4
Kinjal Shah
Kinjal Shah

Reputation: 577

How to solve undefined method `to_key' for #<Book::ActiveRecord_Relation:0x007fb709a6a8c0>?

I am facing problems with undefined method `to_key'

this is my books_controller.rb

 class BooksController  < ApplicationController
   def index
    @books = Book.where(user_id: current_user.id)
    end
 end

and my index page as follow.

index.html.erb

<div>
  <%= form_for @books do |f| %>
...
...
    <% end %>
</div>

now when I am going to access index page that time I got an error as follow.

undefined method `to_key' for #<Book::ActiveRecord_Relation:0x007fb709a6a8c0>

Upvotes: 9

Views: 21347

Answers (2)

Abdullah Aden
Abdullah Aden

Reputation: 932

Should be:

 class BooksController  < ApplicationController
   def index
     @book = Book.find_by_id(2)
   end

or 

   def index
     @book = Book.new
   end

Upvotes: 11

Remus Rusanu
Remus Rusanu

Reputation: 294207

index usually returns a collection. And indeed, your controller conforms. However, your view tries to define a form for it. This is not going to succeed, as you find out. Forms are for entities, not for collections. The bug is in your view and how you expect to handle index.

Upvotes: 18

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