Cannot assign "...'": "..." must be a "User" instance

Question

models.py for assistance

class AssistanceQuest (models.Model):     

    Customer = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE,blank=True,null=False)
    Status = models.BooleanField(default=False,null=False,blank=False)    
    Date_request = models.DateTimeField(auto_now_add=False)
    Tipology = models.CharField(max_length=50, null= False)
    Request = models.TextField(max_length= 1000, blank=False, null=False)

models.py for Custom User

from django.contrib.auth.models import AbstractUser
from .managers import CustomUserManager

class User (AbstractUser):
   is_superuser = None
   is_staff = None
   groups = None
   user_permissions = None
   objects = CustomUserManager()

manager.py for Custom User

 from django.contrib.auth.base_user import BaseUserManager
 from django.utils.translation import ugettext_lazy as _


class CustomUserManager(BaseUserManager):
"""
Custom user model manager senza staff o permessi
"""
def create_user(self, username,email,first_name,last_name,password):
  
    if not email:
        raise ValueError(_('The Email must be set'))
    email = self.normalize_email(email)        
    user = self.model(username = username, email = email, first_name = first_name, last_name = last_name)
    user.set_password(password)
    user.save()
    return user

and this is the view.py for the assistances

    if User.is_authenticated:
                
        Message = "Assistance Request From " + str(User.get_full_name(User)) + ": "+ str(User.email)
        
      
    else:
        Message = "Assistance Request From " + request.POST['message-name-surname']+"\n Email: "+ request.POST['message-email']
    
    Message += "\n City: "+ request.POST['message-city']+"\n Province: "+ request.POST['message-province']+"\n Landline Or Mobile Phone: "+ request.POST['message-phone']+"\n Number Order Or Purchase Period: "+ request.POST['message-number-order']+"\n Product Under Warranty: "+ request.POST['message-warranty']+"\n Request: "+ request.POST['message']+"\n Prefers To Be Contacted: "+ request.POST['message-pref-contact']
    
    if User.is_authenticated:
        user= settings.AUTH_USER_MODEL
        Assistance = AssistanceQuest(Customer=user, Status= 'False',Request= Message, Tipology='Tecnica',Date_request=datetime.datetime.now())
        Assistance.save()
        Subject = "Assistance Request From " + str(User.get_username(User))
        send_mail(
            Subject,
            Message,
            '[email protected]', 
        ['[email protected]'],
        )
    else:
        send_mail(
            "Richiesta non registrata di assistenza",
            Message,
            '[email protected]', 
        ['[email protected]'],
        )

When I try to insert the request, the only error i get is: ValueError at /Assistance/ Cannot assign "'User.User'": "AssistanceQuest.Customer" must be a "User" instance.

Can someone help me?

Answer 1

The Customer field should be a User instance, but you are passing a model instance to the Customer field while creating an AssistanceQuest.

So change this

Assistance = AssistanceQuest(Customer=user, Status= 'False',Request= Message, Tipology='Tecnica',Date_request=datetime.datetime.now())

to

Assistance = AssistanceQuest(Customer=request.user, Status= 'False',Request= Message, Tipology='Tecnica',Date_request=datetime.datetime.now())

Assuming that authenticated user is the customer