如何用aiohttp实现带文件的POST请求及Django测试适配？

Let's break this down into two parts to fix your file upload issues with aiohttp and Django testing.

Fixing the initial aiohttp file upload error #

The TypeError you're hitting happens because aiohttp's request() method doesn't accept a files keyword argument — that's a common gotcha! To mimic the multipart/form-data submission from your HTML form (which lets Django populate request.FILES), you need to structure your upload data correctly using the data parameter instead.

Here's the corrected code:

import aiohttp

async def upload_file(url):
    # Use a context manager to guarantee the file gets closed properly
    with open('file/path', 'rb') as file:
        # Structure for file uploads: a dict where values are tuples
        # Format: (filename, file_object, content_type)
        form_payload = {
            'key': ('your_file_name.txt', file, 'text/plain')  # Adjust content type to match your file
        }
        async with aiohttp.request('post', url, data=form_payload) as response:
            return await response.text()

This structure tells aiohttp to build a valid multipart/form-data request, just like your HTML form. Django will now pick up the file in request.FILES['key'] as expected.

Adjusting pytest test code with Django's InMemoryUploadedFile #

Your test code is creating an InMemoryUploadedFile, but you're passing the raw file object f instead of the uploaded file instance. Plus, you still need to follow the same tuple structure for aiohttp to recognize it as a file upload.

Here's the revised test code:

from django.core.files.uploadedfile import InMemoryUploadedFile
from django.core.files.base import DjangoFile
import aiohttp

def get_uploaded_file(file_path):
    with open(file_path, "rb") as f:
        file = DjangoFile(f)
        # Extract just the filename (instead of using the full path) for realism
        filename = file_path.split('/')[-1]
        uploaded_file = InMemoryUploadedFile(
            file, 
            None, 
            filename, 
            "text/plain", 
            file.size, 
            None, 
            None
        )
        return uploaded_file

async def test_file_upload(url, path):
    uploaded_file = get_uploaded_file(path)
    # Use the uploaded file instance in the required tuple structure
    test_form_data = {
        'key': (uploaded_file.name, uploaded_file, uploaded_file.content_type)
    }
    async with aiohttp.request('post', url, data=test_form_data) as response:
        return await response.text()

Key notes for the test code: #

• We're using the InMemoryUploadedFile instance directly in the tuple, along with its built-in name and content_type attributes.
• We extract a clean filename from the path instead of passing the full path, which matches real-world upload behavior.
• Make sure your pytest setup uses pytest-asyncio to handle async test functions properly.

内容的提问来源于stack exchange，提问作者lee