Added search method to crops

For now it just does a naive SQL LIKE query. We can make this fancier in
future, if we want to.

app/models/crop.rb

@@ -147,4 +147,11 @@ class Crop < ActiveRecord::Base
     end
   end
 
+  # Crop.search(string)
+  # searches for crops whose names match the string given
+  # just uses SQL LIKE for now, but can be made fancier later
+  def self.search(query)
+    where("name LIKE ?", "%#{query}%")
+  end
+
 end

spec/models/crop_spec.rb

@@ -243,4 +243,19 @@ describe Crop do
     end
   end
 
+  context "search" do
+    before :each do
+      @mushroom = FactoryGirl.create(:crop, :name => 'mushroom')
+    end
+    it "finds exact matches" do
+      Crop.search('mushroom').should eq [@mushroom]
+    end
+    it "finds approximate matches" do
+      Crop.search('mush').should eq [@mushroom]
+    end
+    it "doesn't find non-matches" do
+      Crop.search('mush').should_not include @crop
+    end
+  end
+
 end