How to provide validation for the users model in views itself in django(not the custom user model)? - django

Question

I am having user model in the models.py and the every user even the repeated user emails and usernames are being stored in the database but I need the validation of email and password upto 8 characters in the views.py
My models.py is
class users(models.Model):
email=models.CharField(max_length=50,default='0000000')
password=models.CharField(max_length=50,default='0000000')
room = models.ForeignKey(rooms,on_delete=models.CASCADE)
goal = models.ManyToManyField(goals)
style = models.ManyToManyField(designs)
My views.py
def user_register(request):
if request.method == 'POST':
email = request.POST['email']
password = request.POST['password']
room = request.POST['room']
g=goal=request.POST['goal']
g = g.split(',')
s=style=request.POST['style']
s=s.split(',')
user = users(password=password,email=email)
user.room=rooms.objects.get(pk=room)
goal = goals.objects.filter(pk__in=g)
style = designs.objects.filter(pk__in=s)
user.save()
user.goal.add(*goal)
user.style.add(*style)
return render(request,'home.html')
My template is:
<div class="card-body">
<form action="{% url 'car:user_register' %}" method="POST" >
{% csrf_token %}
<div class="form-group">
<label for="username">Username</label>
<input type="text" name="username" class="form-control" required>
</div>
<div class="form-group">
<input type="hidden" name="room" id="name" value=" ">
</div>
<div class="form-group" >
<input type="hidden" name="goal" id="goal" value=" ">
</div>
<div class="form-group" >
<input type="hidden" name="style" id="style" value=" ">
</div>
<div class="form-group">
<label for="email">Email</label>
<input type="text" name="email" class="form-control" required>
</div>
<div class="form-group">
<label for="password2">Password</label>
<input type="password" name="password" class="form-control" required>
</div>
<input type="submit" value="Register" class="btn btn-secondary btn-block">
</form>
</div>
</div>
</div>