Fixed: now all user can logout and login many times.

app/services/user_service.rb

@@ -1,36 +1,39 @@
 # app/services/user_service.rb
 class UserService
     def self.find_or_create_user(auth)
-      uid = auth["uid"]
-      email = auth["info"]["email"]
-      names = auth["info"]["name"].split
-      first_name = names[0]
-      last_name = names[1..].join(" ")
-
-      if Rails.env.test?
-        email_to_find = email.present? ? email : "spongey@tamu.edu"
-        user = UserRepository.find_by_email(email_to_find)
-      end
-
-      unless user
-        user = UserRepository.create_user(
-          uid: uid,
-          email: email,
-          first_name: first_name,
-          last_name: last_name
-        )
-        Role.create(user_id: user.id, role: "Member")
-      end
-
-      user
+        uid = auth["uid"]
+        email = auth["info"]["email"]
+        names = auth["info"]["name"].split
+        first_name = names[0]
+        last_name = names[1..].join(" ")
+
+        user = UserRepository.find_by_uid(uid) || UserRepository.find_by_email(email)
+
+        unless user
+            user = UserRepository.create_user(
+                uid: uid,
+                email: email,
+                first_name: first_name,
+                last_name: last_name
+            )
+
+            if user.nil? || user.id.nil?
+                Rails.logger.error("User creation failed for email: #{email}")
+                raise "User creation failed"
+            end
+
+            Role.create!(user_id: user.id, role: "Member") unless user.roles.exists?
+        end
+
+        user
     end
-  
+
     def self.find_user_by_id(id)
-      UserRepository.find_by_id(id)
+        UserRepository.find_by_id(id)
     end
-  
+
     def self.fetch_all
-      UserRepository.fetch_all
+        UserRepository.fetch_all
     end
-  end
+end