Order crops case-insensitively by default.

app/models/crop.rb

@@ -4,6 +4,7 @@ class Crop < ActiveRecord::Base
   attr_accessible :en_wikipedia_url, :system_name
   has_many :scientific_names
   has_many :plantings
+  default_scope order("lower(system_name) asc")
 
   def Crop.random
     @crop = Crop.offset(rand(Crop.count)).first

spec/models/crop_spec.rb

@@ -42,4 +42,12 @@ describe Crop do
       @rand_crop.system_name.should == 'Tomato'
     end
   end
+
+  context 'ordering' do
+    it "should be sorted case-insensitively" do
+      uppercase = FactoryGirl.create(:uppercasecrop)
+      lowercase = FactoryGirl.create(:lowercasecrop)
+      Crop.first.should == lowercase
+    end
+  end
 end