ruby on rails - view spec fails with "Query does not return ResultSet" -

just trying simple view spec. when first create spec , run it, worked great. later on when needed create model class (app/models/request.rb) starts failing following error:

failure/error: render actionview::template::error: query not return resultset

here view spec:

require 'spec_helper'  describe "requests/new.html.erb"       "renders form reate request"       assign(:request, mock_model("request"))       render     rendered.should have_selector("form",       :method => "post",       :action => requests_path     ) |form|       form.should have_selector("input",:type=>"submit")     end   end end 

here view:

<%= form_for @request |f| %>   <%= f.submit "submit" %> <% end %> 

i can't seem track down wrong , google offers no help.

it appears problem there no active migration model. beginner mistake.