how do i get the username variable from a user to use it in models.py django - html

Question

I want to get the username variable of the logged in user to use it as the default value of create a Post form
in html i can access that by doing {{ user.username}}but when i do that as a default value in my models.py i get the default value as {{ user.username}} just as a text not a variable and when i remove the two curly braces it saids that user is not defined
models.py
class Payment(models.Model):
Author = models.CharField(max_length=255)
Product = models.CharField(max_length=255)
Payment_ID = models.BigIntegerField(default=0)
Status = models.CharField(max_length=5, default="X")
Review_result = models.CharField(max_length=255, default="Not yet reviewed")
created = models.DateTimeField(auto_now_add=True)
class Meta:
ordering = ['-created']
def __unicode__(self):
return u'%s'% self.Status
def __str__(self):
return self.Status
and for the login i use the default form of django
forms.py
from django import forms
from django.contrib.auth.models import User
from django.contrib.auth.forms import UserCreationForm
from .models import Payment
class RegistrationForm(UserCreationForm):
email = forms.EmailField(required=True)
first_name = forms.CharField(required=True)
last_name = forms.CharField(required=True)
class Meta:
model = User
fields = (
'username',
'first_name',
'last_name',
'email',
'password1',
'password2',
)
def save(self, commit=True):
user = super(RegistrationForm, self).save(commit=False)
user.first_name = self.cleaned_data['first_name']
user.last_name = self.cleaned_data['last_name']
user.email = self.cleaned_data['email']
if commit:
user.save()
return user
class PayForm(forms.ModelForm):
class Meta:
model = Payment
fields = ['Author', 'Product', 'Price', 'Payment_ID']
views.py
from django.shortcuts import render, render_to_response , get_object_or_404, redirect
from .models import Post
from django.contrib.auth import authenticate, login
from .forms import RegistrationForm, PayForm
# Create your views here.
def index(request):
posts=Post.objects.all()
return render(request, 'Index.html', {"posts": posts})
def post(request, slug):
return render(request, 'post.html', {'post': get_object_or_404(Post, slug=slug)})
def register(request):
if request.method == 'POST':
form = RegistrationForm(request.POST)
if form.is_valid():
form.save()
username = form.cleaned_data['username']
password = form.cleaned_data['password1']
user = authenticate(username=username, password=password)
login(request, user)
return redirect('index')
else:
form = RegistrationForm()
context = {'form' : form}
return render(request, 'registration/register.html', context)
def new_payment(request):
template ='payment.html'
form = PayForm(request.POST or None)
if form.is_valid():
form.save()
return redirect('index')
else:
form = PayForm()
context = {
'form' : form,
}
return render(request, template, context)

Answer 1

In your view, you can override the initial values of form:
def new_payment(request):
template ='payment.html'
if request.method == 'POST'
form = PayForm(request.POST)
if form.is_valid():
form.save()
return redirect('index')
else:
print('form invalid')
else:
form = PayForm({'Author':request.user.username})
context = {
'form' : form,
}
return render(request, template, context)