return None form django - html

Question

i have a form fill for register but when i try to save it it involves a none object.
the problem is :
The view pages.views.essai didn't return an HttpResponse object. It returned None instead.
here is my code :
views.py
from django.shortcuts import redirect, render
from django.template import RequestContext
from .models import Login
def essai(request):
if not request.method == 'POST':
username = request.POST.get('username')
password = request.POST.get('password')
data = Login(username,password)
print(data)
return render(request,'pages/essai.html')
urls.py
from django.urls import URLPattern, path
from . import views
urlpatterns = [
path('essai', views.essai, name = 'essai'),
]
essai.html
<form action="" method ="POST" >
{% csrf_token %}
<input type="text" name="username">
<input type="password" name="password">
<input type="submit" value ="Save">
</form>
admin.py
from django.contrib import admin
from .models import Login
admin.site.register(Login)
model.py
from django.db import models
class Login(models.Model):
username = models.CharField(max_length=100)
password = models.CharField(max_length=100)
PS : I tried with the forms but it's the same problem.
I do not understand where is the problem is it the views or the model
Edit :
I found the solution,the problem consists in the space of the return !

Answer 1

I think the if condition is the opposite.
You wrote if not but I think it should be if.
from django.shortcuts import redirect, render
from django.template import RequestContext
from .models import Login
def essai(request):
if request.method == 'POST': // here
username = request.POST.get('username')
password = request.POST.get('password')
data = Login(username,password)
print(data)
return render(request,'pages/essai.html')

Answer 2

Your model seems correct. The issue relating to the error message you received is that your view method is checking whether request is not POST. When sending data from the browser to the server you are "posting" so your view should be listening for POSTs when accessing data from your HTML form and assigning them to python variables. You also don't actually save your Login object but only just create it in memory. If you call data.save() it will trigger a database transaction and attempt to add it to your Login table.
When you initially navigate to the page you trigger a GET method as your console output indicates and so you also need to check for request.GET in your view method. In your case this should just return a blank HttpResponse via render() as you do in your post check. A more complete view function might be:
from django.shortcuts import redirect, render
from django.template import RequestContext
from .models import Login
def essai(request):
if request.method == 'POST':
username = request.POST.get('username')
password = request.POST.get('password')
data = Login(username,password)
print(data)
data.save() # to save the object to the database if needed.
return render(request,'pages/essai.html')
elif request.method == 'GET':
return render(request,'pages/essai.html')
The check for request.GET might become useful later when you begin needing to modify how your template looks when it loads for the first time.
To display your model object in a more readable manner you can edit your Login model as follows:
from django.db import models
class Login(models.Model):
username = models.CharField(max_length=100)
password = models.CharField(max_length=100)
def __str__(self):
return f"Username: {username} | Password: {password}"
Then when you print data it should print a nicely formatted string representation of the data you inputted.