Rails - Rendering form_for #user in a different view - ruby-on-rails

Question

I'm trying to render this code (partial to update users payment info).
/devise/registrations/_credit.html.erb
<%= form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put }) do |f| %>
<form action="#">
<div class="form-group">
<label class="control-label">Card Holder Name</label>
<%= f.text_field :name, autofocus: true, class:"form-control" %></div>
<div class="form-group">
<label class="control-label">Card Number</label>
<%= f.text_field :card, autofocus: false, class:"form-control" %>
</div>
<div class="form-group">
<label class="control-label">CVV</label>
<%= f.text_field :cvv, autofocus: false, class:"form-control" %>
</div>
<div class="form-group">
<label class="control-label">Expiration Month</label>
<%= f.text_field :expmonth, autofocus: false, class:"form-control" %>
</div>
<div class="form-group">
<label class="control-label">Expiration Year</label>
<%= f.text_field :expyear, autofocus: false, class:"form-control" %>
</div>
<div class="margin-top-10">
<% if devise_mapping.confirmable? && resource.pending_reconfirmation? %>
<div>Currently waiting confirmation for: <%= resource.unconfirmed_email %></div>
<% end %>
<div class="actions">
<%= f.submit "Update", class:"btn green" %>
<% end %>
</div>
</form>
</div>
I'm trying to get this partial to show up in a different page that's not under users_controller.rb, but I keep getting an error.
NameError in Orders#new
Showing /home/nitrous/code/uvesty/app/views/devise/registrations/_credit.html.erb where line #2 raised:
undefined local variable or method `resource' for #<#<Class:0x00563138834928>:0x00563138821670>

Answer 1

In app/models/order.rb:
class Order < ActiveRecord::Base
belongs_to :user
# only use this if user instance is created before order,
# and alway associated with order
validates :user, presence: true
end
In app/models/user.rb:
class User < ActiveRecord::Base
has_many :orders
# --OR--
# has_one :order
end
In app/controllers/orders_controller.rb:
class OrdersController < ApplicationController
# 1)assuming `current_user` is populated
#
def new
#order = Order.new
#user = current_user
end
# --OR--
# 2) assuming the following line is in `config/routes.rb`:
# get '/orders/new/:id' => 'orders#new'
#
def new
if #order = Order.find_by_id(new_params[:id])
#user = #order.user
else
# do whatever here; replace the next line
raise "order not found"
end
end
private
# only needed for 2) above
def new_params
params.permit(:id)
end
end
see: http://guides.rubyonrails.org/action_controller_overview.html#strong-parameters
In app/view/orders/new.html.erb:
<% raise('#user not defined') unless #user %><%# <- Remove this line after partial is working %>
<%= render partial: "devise/registrations/credit", locals: {resource: #user, resource_name: :user} %>
see: http://guides.rubyonrails.org/layouts_and_rendering.html#passing-local-variables