Using render in RSpec view test - ruby-on-rails

Question

I'm using RSpec to test my views. I want to test that the view for the edit action contains a field (or text) "Director". It's choking on render. Here's my code:
# spec/views/movies/edit.html.haml_spec.rb
require 'spec_helper'
describe 'movies/edit.html.haml' do
it 'displays \'director\' field on edit page' do
render
expect(rendered).to have_content("Director")
end
end
On running this I get the following error:
Failure/Error: render
ActionView::Template::Error:
No route matches {:action=>"show", :controller=>"movies", :id=>nil}
My understanding is that convention over configuration means that render without any arguments should render the intended view app/views/movies/edit.html.haml I don't know why it's looking for the route to the action show. That route does exist, though it has nothing to do with this spec.
I've tried a number of permuations of arguments to render with no luck:
render :edit
render action: :edit # is this even valid?
render :action => :edit
render "edit"
render "edit.html.haml"
render action: "edit"
render action: "edit.html.haml"
render :action => "edit"
render :action => "edit.html.haml"
All the above produce one of two errors:
ArgumentError:
You invoked render but did not give any of :partial, :template, :inline, :file or :text option.
OR
ActionView::MissingTemplate:
Missing partial /edit, movies/edit with {:locale=>[:en], :formats=>[:html, :text, :js, :css, :ics, :csv, :png, :jpeg, :gif, :bmp, :tiff, :mpeg, :xml, :rss, :atom, :yaml, :multipart_form, :url_encoded_form, :json, :pdf, :zip], :handlers=>[:erb, :builder, :coffee, :haml]}.
I'm not trying to render a partial, I'm trying to render the full view. Am I using the convention incorrectly, or using render incorrectly?
Edit1: I don't think it's a partial. There is a view at app/views/movies/edit.html.haml. I may not properly understand what a partial is.
Edit2: I tried the same spec for the new action and it seems to run fine (fails when the text is not there, passes when the text is there). Does this mean I need to load the edit view as a partial, or do I need to give it dummy data for #movie? And why is edit a partial?

Answer 1

For anyone else looking for something similar, you should be assigning a movie model for the view to render.
Something like the following should work:
describe 'movies/edit.html.haml' do
let(:movie) { Movie.create(movie_params_go_here) }
it 'displays \'director\' field on edit page' do
assign(:movie, movie)
render
expect(rendered).to have_content("Director")
end
end