No such route when editing object in rails - ruby-on-rails

Question

I have an object that I am trying to allow users to edit in my rails 4 app. The user has_one supp_form and I want them to be able to edit the information in the supp_form. The page is loading fine and the relationships are setup properly.
The error
No route matches [PATCH] "/businesses/3/supp_form/edit"
when I rake routes I see the following route:
edit_business_supp_form_path GET /businesses/:business_id/supp_form/edit(.:format) supp_forms#edit
GET /businesses/:business_id/supp_form(.:format) supp_forms#show
PATCH /businesses/:business_id/supp_form(.:format) supp_forms#update
PUT /businesses/:business_id/supp_form(.:format) supp_forms#update
supp_forms_controller.rb
class SuppFormsController < ApplicationController
before_filter :authenticate_user!
def new
#suppform = SuppForm.new(supp_form_params)
end
def create
#suppform = SuppForm.create(supp_form_params)
end
def edit
#user = User.current_user
#suppform = #user.supp_form
end
def update
#user = current_user
#suppform = SuppForm.update(supp_form_params)
end
private
def supp_form_params
params.require(:supp_form).permit(:id, :business_id, :title, :first_name,
:last_name, :applicant_role, :work_phone_number)
end
end
View
<%= form_for #user.supp_form, :url => edit_business_supp_form_path(#user.supp_form), :html => { :class => "sky-form", :id => "sky-form4" } do |supp_form| %>
<%= supp_form.text_field :work_phone_number, :placeholder => "Your new phone number" %>
<% end %>

Answer 1

The problem is that it tries to access the route using a PATCH request, that is used for updating. In your routes the /businesses/:business_id/supp_form/edit route is only specified for GET requests, thus the error.
This happens because the path you are using in the form points to the edit action (which is only responsible for showing the edit form) and should instead point to the update action. So the route you should be actually using in the is the supp_form_path that, in connection with the PATCH method, pushes the information to the update action, where the object is updated.