如何将本地文件分配给Django中的FileField？

from django.db import models

class MyModel(models.Model):
    file = models.FileField(upload_to='uploads/')

MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
MEDIA_URL = '/media/'

from django.conf import settings
from django.conf.urls.static import static

urlpatterns = [
    # ...其他URL模式...
] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

from django.shortcuts import render
from .forms import MyForm

def upload_file(request):
    if request.method == 'POST':
        form = MyForm(request.POST, request.FILES)
        if form.is_valid():
            my_model = MyModel()
            my_model.file = form.cleaned_data['file']
            my_model.save()
            return render(request, 'success.html')
    else:
        form = MyForm()
    return render(request, 'upload.html', {'form': form})

<form method="post" enctype="multipart/form-data">
    {% csrf_token %}
    {{ form }}
    <button type="submit">上传</button>
</form>