Added unpopular scope to crop

app/controllers/crops_controller.rb

@@ -7,7 +7,7 @@ class CropsController < ApplicationController
   # GET /crops
   # GET /crops.json
   def index
-    @crops = Crop.includes(:scientific_names, {:plantings => :photos}).paginate(:page => params[:page])
+    @crops = Crop.popular.includes(:scientific_names, {:plantings => :photos}).paginate(:page => params[:page])
 
     respond_to do |format|
       format.html

app/models/crop.rb

@@ -17,7 +17,8 @@ class Crop < ActiveRecord::Base
   default_scope order("lower(name) asc")
   scope :recent, reorder("created_at desc")
   scope :toplevel, where(:parent_id => nil)
-  scope :popular, reorder("plantings_count desc")
+  scope :popular, where("plantings_count > 0").reorder("plantings_count desc, lower(name) asc")
+  scope :unpopular, where(:plantings_count => nil)
   scope :randomized, reorder('random()') # ok on sqlite and psql, but not on mysql
 
   validates :en_wikipedia_url,

spec/models/crop_spec.rb

@@ -56,6 +56,7 @@ describe Crop do
     before (:each) do
       @tomato = FactoryGirl.create(:tomato)
       @maize = FactoryGirl.create(:maize)
+      @cucumber = FactoryGirl.create(:crop, :name => 'cucumber')
       (1..10).each do
         FactoryGirl.create(:planting, :crop => @maize)
       end
@@ -72,6 +73,10 @@ describe Crop do
       Crop.popular.first.should eq @tomato
     end
 
+    it "finds unpopular crops" do
+      Crop.unpopular.should eq [@cucumber]
+    end
+
   end
 
   it 'finds a default scientific name' do