Adding to User new variable / money system in game

New to Django,

I want create a money system in my game that each user have a different coins

I tried add to User in views a variable 'balance'

My views.py:

1. from monety.models import Gamer
2. from django.contrib.auth.models import User 
3. from .forms import RegisterForm
4. 
   
5. def registration(response):
6.     if response.method == "POST":
7.         form = RegisterForm(response.POST)
8.         if form.is_valid():
9.             user = User.objects.all().filter(username=username)[0] 
10.             gamer = Gamer(myuser=user)
11.             form.save()
12.             gamer.save()
13.             return redirect('/garden')
14.     else:
15.         form = RegisterForm()
16. 
    
17.     return render(response, "registration.html", {"form":form})

My models.py

1. from django.db import models
2. from django.contrib.auth.models import User 
3.  
4. class Gamer(models.Model):
5.     myuser = models.OneToOneField(
6.         User, 
7.         on_delete=models.CASCADE
8.     )
9.     balance = models.IntegerField(default=100)

My forms.py

1. from django.contrib.auth import login, authenticate
2. from django.contrib.auth.forms import UserCreationForm
3. from django import forms
4. from django.contrib.auth.models import User
5. 
   
6. class RegisterForm(UserCreationForm):
7.     email = forms.EmailField()
8. 
   
9.     class Meta:
10.         model = User
11.         fields = ["username", "email", "password1", "password2"]
    

I get "NameError: name 'username' is not defined" and I have no idea how to fix it to make it work

(sorry for my bad english)

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