Merge branch 'feature-edit-lo' of gitlab.c3sl.ufpr.br:portalmec/portalmec into feature-edit-lo

app/models/language.rb

 class Language < ActiveRecord::Base
-  has_many :learning_object
+  has_many :learning_objects
 
   validates_uniqueness_of :code
+  validates_presence_of :name, :code
 end

lib/tasks/language.rake

+namespace :language do
+  desc 'Clean languages that fail the validations'
+  task :clean => :environment do
+    Language.all.each do |language|
+      Language.destroy language.id if language.invalid?
+    end
+  end
+end
\ No newline at end of file

test/models/language_test.rb

+require 'test_helper'
+
+class LanguageTest < ActiveSupport::TestCase
+  should have_many :learning_objects
+
+  should validate_presence_of(:name)
+  should validate_presence_of(:code)
+
+  should validate_uniqueness_of(:code)
+end