问题描述
我想在 django 中使用 session_key 作为存储桶内的目录将图像保存到 S3 存储桶。
我创建了一个测试页面,用于将图像上传到存储桶中的设置位置,但不知道如何使用 session_key 动态设置上传位置。
我查看了 django-storages
的文档,如果不是因为我使用的是 ModelForm
,我可以找到一种方法。
这是我的代码(我省略了带有存储桶名称和凭据的 settings.py):
storage_backends.py
from storages.backends.s3boto3 import S3Boto3Storage
class TestS3MediaStorage(S3Boto3Storage):
location = 'dev/'
default_acl = 'public-read'
file_overwrite = False
models.py
from .storage_backends import TestS3MediaStorage
class TestS3Upload(models.Model):
uploaded_at = models.DateTimeField(auto_Now_add=True)
file = models.FileField(storage=TestS3MediaStorage())
forms.py
from .models import TestS3Upload
class TestS3UploadForm(forms.ModelForm):
class Meta:
model = TestS3Upload
fields = ['file']
views.py
from django.shortcuts import render
from django.http import HttpResponse
from .forms import TestS3UploadForm
def test_s3_upload(request):
# create session if it doesn't already exist
if not request.session.session_key:
request.session.create()
# not quite sure how to use this to set upload destination
session_key = request.session.session_key
if request.method == 'POST':
form = TestS3UploadForm(request.POST,request.FILES)
if form.is_valid():
form.save()
return HttpResponse("upload successful!")
else:
form = TestS3UploadForm()
return render(
request,'uploader/test_s3_upload.html',{
'form': form
}
)
test_s3_upload.html
<h1>Test S3 file upload</h1>
<form method="POST" enctype="multipart/form-data">
{% csrf_token %}
{{ form.as_p }}
<button type="submit">Upload photo to S3 Bucket</button>
</form>
当我运行我的代码并上传图像时,例如 car.jpg
,它上传成功但 S3 存储桶内的路径是
<bucket-name>/dev/car.jpg
我想要
<bucket-name>/dev/<session-key>/car.jpg
需要的包是 boto3
和 django-storages
,以防任何想要帮助回答的人需要知道。
解决方法
我想出了一种使用会话密钥将图像/文件上传到 s3 到目录的方法。它也适用于一般上传文件,而不仅仅是 s3。
首先,我向模型添加了一个属性来存储会话密钥。
class TestS3Upload(models.Model):
session_key = models.CharField(max_length=50,null=False,blank=False)
...
然后我在模型表单上包含了一个隐藏字段,我在视图中预先填充了 session_key
值。
forms.py
class TestS3UploadForm(forms.ModelForm):
class Meta:
model = TestS3Upload
fields = ['file','session_key']
widgets = {'session_key': forms.HiddenInput()}
views.py
def test_s3_upload(request):
# create session if it doesn't already exist
if not request.session.session_key:
request.session.create()
session_key = request.session.session_key
...
form = TestS3UploadForm(initial={'session_key': session_key})
然后我在我的 models.py
中创建了一个函数,它使用模型中的 session_key 返回一个路径,并将模型的文件字段 upload_to
属性设置为这个函数
...
import os
def upload_to_session_key_dir(instance,filename):
return os.path.join(instance.session_key,filename)
class TestS3Upload(models.Model):
session_key = models.CharField(max_length=50,blank=False)
uploaded_at = models.DateTimeField(auto_now_add=True)
file = models.FileField(upload_to=upload_to_session_key_dir)
现在保存表单时,它会将文件上传到包含 session_key 的目录中。
最后的views.py
from django.shortcuts import render
from django.http import HttpResponse
from .forms import TestS3UploadForm
from .models import TestS3Upload
def test_s3_upload(request):
# create session if it doesn't already exist
if not request.session.session_key:
request.session.create()
session_key = request.session.session_key
if request.method == 'POST':
form = TestS3UploadForm(request.POST,request.FILES)
if form.is_valid():
form.save()
filename = "{}/{}".format(session_key,form.cleaned_data['file'].name)
s3_upload_path = TestS3Upload.objects.get(file=filename).file.url
return HttpResponse("Image successfully uploaded to bucket at location: {}".format(s3_upload_path))
else:
form = TestS3UploadForm(initial={'session_key': session_key})
return render(
request,'upload/test_s3_upload.html',{
'form': form
}
)
视图 test_s3_upload.html 的模板保持不变。