python - 如何在模板中为文件列表请求 GET 参数？(Django Zip 文件下载问题)

Question

我想通过压缩的方式下载函数创建的所有单个或多个文件。

问题出在模板上。请正确建议传递文件列表的 GET 参数我收到一个错误:

FileNotFoundError at /test/
[Errno 2] No such file or directory: '['

这是错误放置引用文件列表的查询字符串的错误。

我的看法如下:

def submit(request):
    def file_conversion(input_file,output_file_pattern,chunk_size):
            output_filenames = []
            with open(input_file,"r+") as fin:
    # ignore headers of input files
                for i in range(1):
                    fin.__next__()
            
                reader = csv.reader(fin, delimiter=',')
                
                
                for i, chunk in enumerate(chunked(reader, chunk_size)):
                    output_filename = output_file_pattern.format(i)
                    with open(output_filename, 'w', newline='') as fout:
                        output_filenames.append(output_filename)
                        writer = csv.writer(fout, reader, delimiter='^')
                        writer.writerow(fed_headers)
                        writer.writerows(chunk)
                            # print("Successfully converted into", output_file)
                return output_filenames

    paths = file_conversion(input_file,output_file+'{01}.csv',10000)
    # paths return a list of filenames that are created like output_file1.csv,output_file2.csv can be of any limit
    # when i tried paths[0], it returns output_file1.csv
    context = {'paths' :paths}

def test_download(request):
    paths = request.GET.get('paths')
    context ={'paths': paths}
    response = HttpResponse(content_type='application/zip')
    zip_file = zipfile.ZipFile(response, 'w')
    for filename in paths:
        zip_file.write(filename)
    zip_file.close()
    response['Content-Disposition'] = 'attachment; filename='+'converted files'
    return response

模板

<p> 
<a href ="{% url 'test_download' %}?paths={{ paths|urlencode }} " download>Converted Files</a> </p>
<br>

帮我找到这里的问题。

问题:

?path 正在寻找文件，但它已找到列表。

然后我尝试了:

def test_download(request):
    paths = request.GET.getlist('paths')
    context ={'paths': paths}
    response = HttpResponse(content_type='application/zip')
    zip_file = zipfile.ZipFile(response, 'w')
    for filename in paths:
         zip_file.write(filename)
    zip_file.close()
    response['Content-Disposition'] = 'attachment; filename='+'converted files'
    return response

模板:

<p> <a href ="{% url 'test_download' %}?paths=path1 " download>Converted Files</a> </p>
<br>

它查找文件为

FileNotFoundError at /test/
[Errno 2] No such file or directory: '/home/rikesh/Projects/FedMall/main/temp/47QSHA19D003A_UPDATE_20210113_{:01}.csv'

文件路径应该是:

/home/rikesh/Projects/FedMall/main/temp/47QSHA19D003A_UPDATE_20210113_0.csv

Answer 1

request.GET.get('paths') 返回路径列表的字符串表示，而不是列表对象。返回值将像这样 "['/path/file1', 'path/file2']"。当您遍历路径时，它实际上遍历了字符串中的每个字符。这就是为什么它首先尝试查找名称为 [ 的目录。

要将文件路径列表传递给 GET 请求，您需要将 url 更改为此

<your_url>?paths=path1&paths=path2&paths=path3...

在您的 Python 代码中，使用此获取文件路径

request.GET.getlist('paths')