remove acts_as_paranoid, use .trash! , .recover! and .with_deleted as needed

makes upgrading to rails 4 possible

lib/trashable.rb

@@ -0,0 +1,32 @@
+module Trashable
+  extend ActiveSupport::Concern
+
+  included do
+    default_scope where(with_deleted_scope_sql)
+  end
+
+
+  module ClassMethods
+    def with_deleted
+      # lifted from acts_as_paranoid, works around http://stackoverflow.com/questions/8734669/rails-3-1-3-unscoped-scope
+      scope = self.scoped.with_default_scope
+      scope.where_values.delete(with_deleted_scope_sql)
+      scope
+    end
+
+    def with_deleted_scope_sql
+      self.scoped.table[:deleted_at].eq(nil).to_sql
+    end
+  end
+
+  def trash!
+    self.update_column(:deleted_at, DateTime.now)
+  end
+
+  def recover!
+    # see: https://github.com/rails/rails/issues/8436
+    self.class.unscoped.update_all({deleted_at: nil}, id: self.id)
+    raw_write_attribute :deleted_at, nil
+  end
+
+end