Django form not saving if I use action attribute - python-3.x

Question

For context, here is the view.py
from .forms import SignIn
...
def sign_in_view(request, *args, **kwargs):
form = SignIn(request.POST or None)
if form.is_valid():
form.save()
form = SignIn(request.POST or None)
context = {
'form': form
}
return render(request, "accounts/sign_in.html", context)
here is the HTML file for accounts/sign_in.html
{% extends "accounts/base.html" %}
{% block title %}
<title>Log-in</title>
{% endblock %}
{% block content %}
<h1 align="center">Sign in</h1>
<hr/>
<form method="POST" action="http://127.0.0.1:8000/home/"> # currently in localhost
{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Sign in">
</form>
{% endblock content %}
Without the attribute action="http://127.0.0.1:8000/home/" in my form tag in accounts/sign_in.html, I manage to successfully add a user to the database by typing in the required parameters on the browser.
However, with the attribute action="http://127.0.0.1:8000/home/", I was redirected to the URL, but when I checked the database in /admin/, I was unable to see the user there.
I don't know if the form isn't saved, or I had just done some stupid mistake.
Thanks.

Answer 1

Action attribute is not for redirection after sending the form. It should be the url attached to the view that is responsible for handling a form. What is the url of your sign_in_view? If it is for example /sign-in/ that should be value of action attribute. If you want to redirect user after signing in, do it in your sign_in_view:
if form.is_valid():
...
return redirect('/home/')
Here is a link for Django docs that includes all the useful information about forms:
https://docs.djangoproject.com/en/3.0/topics/forms/

Answer 2

This is a better way for the user to register.
view.py
def sign_in_view(request):
form = SignIn(request.POST or None)
if form.is_valid():
user = form.save()
username = form.cleaned_data.get('username')
password = form.cleaned_data.get('password')
user = authenticate(request, username=username, password=password)
if user is not None:
login(request, user)
return redirect('/')
context = {
'form': form
}
return render(request, "accounts/sign_in.html", context)
and than in you template you can do this
{% extends "accounts/base.html" %}
{% block title %}
<title>Log-in</title>
{% endblock %}
{% block content %}
<h1 align="center">Sign in</h1>
<hr/>
<form method="POST" action=""> # currently in localhost
{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Sign in">
</form>
{% endblock content %}