Django how to get model values inside another model? - django

Question

I want the value of username from forms that I get as a string so that when I upload an image it is stored in a subdirectory with that username.
i.e. if 'bob' registers the image should be saved in 'static/auth_image/bob/image_name.extension'.
Also if I could it during the registration form filling that would be great.
models.py
class User_data(models.Model):
username = models.CharField(max_length=256, null=True, blank=True)
email = models.EmailField(max_length=254, null=True, blank=True)
four_digit_pass = models.CharField(max_length=256, null=True, blank=True)
private_key = models.CharField(max_length=256, null=True, blank=True)
profile_pic = models.ImageField(upload_to='static/profilepic', null=True)
def getUsername(self):
return self.username
def __str__(self):
return str(self.username)
class AuthImages(models.Model):
owner = models.ForeignKey('User_data', null=True, on_delete=models.CASCADE)
uname=owner.
def save_auth_image(self):
uname = self.username
self.auth_image_file = models.ImageField(
upload_to='static/auth_image/%s' % uname, null=True)
forms.py
class RegistrationForm(forms.ModelForm):
four_digit_pass = forms.CharField(widget=forms.PasswordInput())
class Meta:
model = User_data
fields = ['username', 'email', 'four_digit_pass',
'profile_pic', 'private_key']
register.html
{% extends "storage_app/base.html" %}
{% block body_block %}
<div class="jumbotron">
<h1>Register Page</h1>
</div>
<div>
<form method="post" enctype="multipart/form-data">
{% csrf_token %}
{{ form.as_p }}
<p>Private Key should not be changed or shared with anyone</p>
<button type="submit">Upload</button>
</form>
</div>
{% endblock body_block %}
here in HTML, i want to take input for the second i.e. auth_image directly from webcam if possible
This is my first question also I am new to Django so please help me out if there is a cleaner way to write this and please excuse any mistakes.