Gracefully support Rails version differences instead of doing version…

… checks

app/models/bookmark.rb

@@ -5,7 +5,10 @@ class Bookmark < ActiveRecord::Base
   belongs_to :document, polymorphic: true
 
   validates_presence_of :user_id, :scope=>:document_id
-  attr_accessible :id, :document_id, :document_type, :title if Rails::VERSION::MAJOR < 4
+
+  if respond_to? :attr_accessible
+    attr_accessible :id, :document_id, :document_type, :title
+  end
 
   def document
     document_type.new document_type.unique_key => document_id

app/models/search.rb

@@ -5,10 +5,13 @@ class Search < ActiveRecord::Base
 
   serialize :query_params
 
-  if Rails::VERSION::MAJOR < 4
+  if respond_to?(:attr_accessible)
     attr_accessible :query_params 
-
-    scope :none, where(:id => nil).where("id IS NOT ?", nil)
+  end
+
+  unless respond_to?(:none)
+    # polyfill
+    scope :none, where(id: nil).where("id IS NOT ?", nil)
   end
 
   # A Search instance is considered a saved search if it has a user_id.

lib/generators/blacklight/user_generator.rb

@@ -47,7 +47,9 @@ def inject_blacklight_user_behavior
       file_path = "app/models/#{model_name.underscore}.rb"
       if File.exists?(file_path)
         inject_into_class file_path, model_name.classify do
-          "\n  attr_accessible :email, :password, :password_confirmation if Rails::VERSION::MAJOR < 4\n" +
+          "\n  if respond_to? :attr_accessible\n" +
+          "\n    attr_accessible :email, :password, :password_confirmation" +
+          "\n  end\n" +
             "# Connects this user object to Blacklights Bookmarks. " +
             "\n  include Blacklight::User\n"
         end