如何在Django中检查和传递表单中的用户实例？

# forms.py
from django import forms

class MyForm(forms.Form):
    username = forms.CharField(max_length=100)
    email = forms.EmailField()

    def clean_username(self):
        username = self.cleaned_data['username']
        # 进行用户名验证的逻辑
        return username

# views.py
from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST, user=request.user)
        if form.is_valid():
            # 表单数据有效，可以进行后续处理
            username = form.cleaned_data['username']
            email = form.cleaned_data['email']
            # 其他处理逻辑
    else:
        form = MyForm(user=request.user)
    
    return render(request, 'my_template.html', {'form': form})