Capital letters emails fix

accounts/backends.py

@@ -7,7 +7,7 @@ class EmailBackend(ModelBackend):
     def authenticate(self, request, username=None, password=None, **kwargs):
         UserModel = get_user_model()
         try:
-            user = UserModel.objects.get(email=username)
+            user = UserModel.objects.get(email__iexact=username)
         except UserModel.DoesNotExist:
             return None
         else:

accounts/forms.py

@@ -36,6 +36,12 @@ class Meta:
         ]
     # We need the user object, so it's an additional parameter
 
+    def clean_email(self):
+        email = self.cleaned_data.get('email').lower()
+        if CustomUser.objects.filter(email__iexact=email).exists():
+            raise forms.ValidationError("Email address already exists.")
+        return email
+
     def send_activation_email(self, request, user):
         current_site = get_current_site(request)
         subject = 'Activate Your Account'

accounts/views.py

@@ -72,6 +72,7 @@ def get_form_kwargs(self):
         return kwargs
 
     def form_valid(self, form):
+        form.instance.email = form.instance.email.lower()
         to_return = super().form_valid(form)
         user = form.save()
         user.is_verified = False  # Turns the user email verification to False