First fix in the model specs, more to be done, mostly event mocking it seems

spec/models/section_spec.rb

@@ -1,8 +1,9 @@
 require 'spec_helper'
 
 describe :section do
+  let(:supplier) { create :supplier }
   before :each do
-    @section = build :section, path: [[10, 30], [20,30], [20,40], [10, 40]]
+    @section = build :section, supplier: supplier, path: [[10, 30], [20,30], [20,40], [10, 40]]
   end
 
   it "creates without problem" do
@@ -23,6 +24,7 @@ describe :section do
       it "should persist width property through database" do
         @section.width = 3.2
         @section.save
+
         @reloaded_section = Section.find(@section.id)
         @reloaded_section.width.should == 3.2
       end