Refactor user_registered? method

app/models/conference.rb

@@ -122,13 +122,7 @@ class Conference < ActiveRecord::Base
   # * +false+ -> If the user is registered
   # * +true+ - If the user isn't registered
   def user_registered? user
-    return false if user.nil?
+    user.present? && registrations.where(user_id: user.id).count > 0
-
-    if registrations.where(user_id: user.id).count == 0
-      return false
-    else
-      return true
-    end
   end
 
   ##

spec/models/conference_spec.rb

@@ -1463,6 +1463,12 @@ describe Conference do
       end
     end
 
+    context 'user is nil' do
+      it '#user_registered? is false' do
+        expect(subject.user_registered? user).to be false
+      end
+    end
+
     context 'user registered' do
       before do
         registration = create(:registration)