Require a system name for crops.

db/migrate/20121003190731_require_system_name_for_crops.rb

@@ -0,0 +1,15 @@
+class RequireSystemNameForCrops < ActiveRecord::Migration
+  def up
+    change_table :crops do |t|
+      t.index :system_name
+      t.change :system_name, :string, :null => false
+    end
+  end
+
+  def down
+    change_table :crops do |t|
+      t.change :system_name, :string, :null => true
+      t.remove_index :system_name
+    end
+  end
+end

db/schema.rb

@@ -11,15 +11,17 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20121001212604) do
+ActiveRecord::Schema.define(:version => 20121003190731) do
 
   create_table "crops", :force => true do |t|
-    t.string   "system_name"
+    t.string   "system_name",      :null => false
     t.string   "en_wikipedia_url"
     t.datetime "created_at",       :null => false
     t.datetime "updated_at",       :null => false
   end
 
+  add_index "crops", ["system_name"], :name => "index_crops_on_system_name"
+
   create_table "users", :force => true do |t|
     t.string   "email",                  :default => "", :null => false
     t.string   "encrypted_password",     :default => "", :null => false

spec/controllers/crops_controller_spec.rb

@@ -24,7 +24,7 @@ describe CropsController do
   # Crop. As you add validations to Crop, be sure to
   # update the return value of this method accordingly.
   def valid_attributes
-    {}
+     { :system_name => "Tomato" }
   end
 
   # This should return the minimal set of values that should be in the session

spec/models/crop_spec.rb

@@ -1,5 +1,29 @@
 require 'spec_helper'
 
 describe Crop do
-  pending "add some examples to (or delete) #{__FILE__}"
+  context 'all fields present' do
+
+    before(:each) do
+      @crop = Crop.new
+      @crop.system_name = "Tomato"
+      @crop.en_wikipedia_url = "http://en.wikipedia.org/wiki/Tomato"
+    end
+
+    it 'should save a basic crop' do
+      @crop.save.should be_true
+    end
+
+    it 'should be fetchable from the database' do
+      @crop.save
+      @crop2 = Crop.find_by_system_name('Tomato')
+      @crop2.en_wikipedia_url.should == "http://en.wikipedia.org/wiki/Tomato"
+    end
+  end
+
+  context 'invalid data' do
+    it 'should not save a crop without a system name' do
+      @crop = Crop.new
+      expect { @crop.save }.to raise_error ActiveRecord::StatementInvalid
+    end
+  end
 end