Finally fixed seed (bad öäü)

db/seeds.rb

@@ -21,9 +21,9 @@ User.create!(email: "tutor2.operator@hs-rm.de", firstname: "Tutor2", lastname: "
 # Students
 students = []
 5.times do
-  firstname = Faker::Name.unique.first_name.delete(" ")
-  lastname = Faker::Name.unique.last_name.delete(" ")
-  email="#{firstname}.#{lastname}@student.hs-rm.de"
+  firstname = Faker::Name.unique.first_name
+  lastname = Faker::Name.unique.last_name
+  email="#{firstname}.#{lastname}@student.hs-rm.de".downcase.gsub('ö', 'oe').gsub('ä', 'ae').gsub('ü', 'ue')
   email.delete(" ")
   students << User.new(email: email, firstname: firstname, lastname: lastname, password_digest: BCrypt::Password.create("password"), verified: true)
   students.last.save!