Testing views of nested resources

Testing RSpec
1

I’ve searched and searched, and just can’t find an answer on the list or
elsewhere. Forgive me if I’m missing something…

I’ve got the following bits of code:

app/controllers/widget_layouts_controller.rb:

class WidgetLayoutsController < ApplicationController
def new
@widget = Widget.find(params[:widget_id])
@widget_layout = WidgetLayout.new
end
end

app/models/widget_layout.rb:

class WidgetLayout < ActiveRecord::Base
belongs_to :widget
end

app/models/widget.rb:

class Widget < ActiveRecord::Base
has_one :widget_layout, :dependent => :destroy
end

From config/routes.rb:

resources :widgets do
resource :widget_layout
end

spec/widget_layouts/new.html_spec.rb:

require “spec_helper”

describe “widget_layouts/new.html.erb” do
it “should render the new widget layout form” do
widget = stub_model(Widget)
assign(params[:widget_id], widget)
render
rendered.should have_selector(“form”, :method => “post”, :action =>
widget_widget_layout_path(widget))
end
end

app/views/widget_layouts/new.html.erb

<%= form_for @widget_layout, :url => widget_widget_layout_path(@widget)
do |f| %>
<%= f.submit “Submit Widget Layout Information” %>
<% end %>

Here’s the error I get when running that spec:

widget_layouts/new.html.erb
should render the new widget layout form (FAILED - 1)

Failures:

  1. widget_layouts/new.html.erb should render the new widget layout
    form
    Failure/Error: render
    No route matches {:controller=>“widget_layouts”,
    :action=>“destroy”}

/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_dispatch/routing/route_set.rb:398:in
generate' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_dispatch/routing/route_set.rb:450:ingenerate’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_dispatch/routing/route_set.rb:478:in
url_for' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_dispatch/routing/url_for.rb:132:inurl_for’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/helpers/url_helper.rb:99:in
url_for' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_dispatch/routing/route_set.rb:195:inwidget_widget_layout_path’
# ./app/views/widget_layouts/new.html.erb:1:in
_app_views_widget_layouts_new_html_erb___4529585855698402853_2170042420_599441616533773267' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/template.rb:135:inblock in render’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/activesupport-3.0.0.rc/lib/active_support/notifications.rb:52:in
block in instrument' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/activesupport-3.0.0.rc/lib/active_support/notifications/instrumenter.rb:21:ininstrument’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/activesupport-3.0.0.rc/lib/active_support/notifications.rb:52:in
instrument' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/template.rb:127:inrender’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/render/rendering.rb:59:in
block in _render_template' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/activesupport-3.0.0.rc/lib/active_support/notifications.rb:52:inblock in instrument’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/activesupport-3.0.0.rc/lib/active_support/notifications/instrumenter.rb:21:in
instrument' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/activesupport-3.0.0.rc/lib/active_support/notifications.rb:52:ininstrument’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/render/rendering.rb:56:in
_render_template' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/render/rendering.rb:26:inrender’
#
/Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/test_case.rb:103:in
render' # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/rspec-rails-2.0.0.beta.20/lib/rspec/rails/example/view_example_group.rb:70:inrender’
# ./spec/views/widget_layouts/new.html_spec.rb:7:in `block (2
levels) in <top (required)>’

I believe this is because params[:widget_id] isn’t assigned when I’m
rendering new.html.erb. I know that’s an improper usage of #assign up
there, but this is what I was trying to rectify (obviously
incorrectly…) I’m confused as to how to mock/stub and specify parent
resource(s) when trying to test views of children resources. What
should I be doing differently?

Also–not an RSpec question–that’s the only way I can get that
#form_for call to work correctly. Everywhere I looked, it seemed that I
could simply use:

form_for [@widget, @widget_layout] do |f| %>

but alas, all I get is the following errors:

NoMethodError in Widget_layouts#new
Showing
/Users/brennon/Documents/Programming/checkouts/rails_projects/stan/app/views/widget_layouts/new.html.erb
where line #1 raised:

undefined method `widget_widget_layouts_path’ for
#<#Class:0x00000102c44ed0:0x00000102c3fa48>
Extracted source (around line #1):
1: <%= form_for [@widget, @widget_layout] do |f| %>
2: <%= f.submit “Submit Widget Layout Information” %>
3: <% end %>

Any chance I might get some help on this one while I’m at it? :slight_smile:
Many thanks,
Brennon B.
Software Researcher
Dundalk Institute of Technology
[email protected]
Ph.D. Researcher & Composer - Sonic Arts Research Centre
Queen’s University, Belfast
[email protected] / [email protected]

2

On 8 Sep 2010, at 16:20, Brennon B. wrote:

end

widget = stub_model(Widget)

 # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_dispatch/routing/route_set.rb:450:in `generate'
 # /Users/brennon/.rvm/gems/ruby-1.9.2-p0@stan/gems/actionpack-3.0.0.rc/lib/action_view/render/rendering.rb:59:in `block in _render_template'

Extracted source (around line #1):
1: <%= form_for [@widget, @widget_layout] do |f| %>
2: <%= f.submit “Submit Widget Layout Information” %>
3: <% end %>

Any chance I might get some help on this one while I’m at it? :slight_smile:
Well, that was certainly a stupid mistake…figured it out with this:

it “should render the new widget layout form” do
widget = stub_model(Widget, :id => “1”)
assign(:widget, widget)
params[:widget_id] = widget.id
assign(:widget_layout, mock_model(WidgetLayout).as_null_object)
render
rendered.should have_selector(“form”, :method => “post”, :action =>
widget_widget_layout_path(widget))
end

Now, can anyone provide some insight on a more elegant #form_for call
for me?

Thanks again,
Brennon