old_contents: from django import forms
  from django.contrib.auth import authenticate
  from django.contrib.auth.forms import AuthenticationForm
  
  from .models import User
  
  
  class LoginForm(AuthenticationForm):
  
      email = forms.EmailField()
      password = forms.CharField(widget=forms.PasswordInput)
  
      def __init__(self, *args, **kwargs):
          self.organization = kwargs.pop('organization')
          super(LoginForm, self).__init__(*args, **kwargs)
  
      def clean(self):
          username = self.cleaned_data.get('username')
          password = self.cleaned_data.get('password')
  
          if username and password:
              self.user_cache = authenticate(
                  username=username,
                  password=password,
                  organization=self.organization
              )
              if self.user_cache is None:
                  raise forms.ValidationError(
                      self.error_messages['invalid_login'],
                      code='invalid_login',
                      params={'username': 'email'},
                  )
              else:
                  self.confirm_login_allowed(self.user_cache)
  
          return self.cleaned_data
  
new_contents: from django import forms
  from django.contrib.auth import authenticate
  from django.contrib.auth.forms import AuthenticationForm
  
  from .models import User
  
  
  class LoginForm(AuthenticationForm):
  
      def __init__(self, *args, **kwargs):
          self.organization = kwargs.pop('organization')
          super(LoginForm, self).__init__(*args, **kwargs)
  
      def clean(self):
          username = self.cleaned_data.get('username')
          password = self.cleaned_data.get('password')
  
          if username and password:
              self.user_cache = authenticate(
                  username=username,
                  password=password,
                  organization=self.organization
              )
              if self.user_cache is None:
                  raise forms.ValidationError(
                      self.error_messages['invalid_login'],
                      code='invalid_login',
                      params={'username': 'email'},
                  )
              else:
                  self.confirm_login_allowed(self.user_cache)
  
          return self.cleaned_data
  
subject: Remove fields from LoginForm