First argument in form cannot contain nil or be empty - Rails 4

Question

I receive this error with my contact form in rails:

First argument in form cannot contain nil or be empty

View:

Answer 1

I had a similar problem where I had a form in a modal that made changes to a model that was different than what the background page was showing. Even though I had the required @contact = Contact.new in my Contact controller, I needed to add this code within the controller for the background page.

For example, I have a PhoneBook model and within my index view for PhoneBook I have a modal with a form that adds a contact to my Contact model. I need @contact = Contact.new within my index method in my PhoneBook controller:

class PhoneBook < ApplicationController

  def index
    @contact = Contact.new
    ...
  end
end

And then the form within my modal that is being shown on PhoneBook index.html has the same syntax as others have written:

<div id="phoneBook">
  <div id="myModal" class="modal">
    <%= form_for @contact do |f| %>
    ...
  </div>
</div>