How to have multiple return statement in python django?

Question

In my Views.py, I try to download the csv file first to client side then only wish to redirect to another page.

Below was my code

def main(request):
    ...
    ...
    url = '//file1.km.in.com/sd/recipe/' +"/"+ model + "_" + code + ".csv"
    filename=model + "_" + code + ".csv"
    download_csv(url,filename)
    data = {"TableForm": TableForm, "devicelist": devicelist_1}
    time.sleep(10)
    return redirect('/ProductList/BetaTest', data)

def download_csv(url,filename):
    csv = process_file(url)
    response = HttpResponse(csv, content_type='text/csv')
    response['Content-Disposition'] = 'attachment; filename='+filename
    return response

def process_file(file_handle):
    df = pd.read_csv(file_handle, index_col=False)
    return df.to_csv(index=False)

However, download function didn't work but it directly redirect to BetaTest page.

I try to edit to below code, and now the download function is work but it cannot redirect to another page:

def main(request):
    ...
    ...
    data = {"TableForm": TableForm, "devicelist": devicelist_1}
    csv = process_file(url)
    response = HttpResponse(csv, content_type='text/csv')
    response['Content-Disposition'] = 'attachment; filename='+filename
    return response
    time.sleep(10)
    return redirect('/ProductList/BetaTest', data)

Is there any ideas to overcome this issue?

Aadi · Accepted Answer · 2022-03-20 09:39:19Z

1

A return statement is used to end the execution of the function call and “returns” the result (value of the expression following the return keyword) to the caller. The statements after the return statements are not executed. If the return statement is without any expression, then the special value None is returned. So there is no possibility to call two return statements in a single call.

answered Mar 20, 2022 at 9:39

Aadi

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2 Comments

Shi Jie Tio Over a year ago

Is there any statement i can replace the return response?

Aadi Over a year ago

@ShiJieTio you can return redirect from backend and use frontend JS to make the download for the user.

Subham · Accepted Answer · 2022-03-20 07:48:58Z

0

You can return multiple values by simply returning them separated by commas.

return example1, example2

answered Mar 20, 2022 at 7:48

Subham

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5 Comments

Shi Jie Tio Over a year ago

hi , it doesn't work, I have try before, the output is 'tuple' object has no attribute 'status_code'

Shi Jie Tio Over a year ago

i have try return{response, redirect('/ProductList/BetaTest', data)} also cannot

Subham Over a year ago

Link Do check this out.

Shi Jie Tio Over a year ago

I still cant get it, based on my case the two function is different category and the variable is passing around, I hope u will help me more

Subham Over a year ago

Hmm, I will update it once I find a proper solution you are looking for.

Ivan Kwong · Accepted Answer · 2022-03-20 08:19:02Z

0

Instead of using return, you should use yield:

def stream_response(request):
    def generator():
        for x in range(1,11):
            yield f"{x}\n"
            time.sleep(1)
    return StreamingHttpResponse(generator())

answered Mar 20, 2022 at 8:19

Ivan Kwong

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2 Comments

Shi Jie Tio Over a year ago

I already replace the return to yield but I get "It returned an unawaited coroutine instead. You may need to add an 'await' into your view."

Ivan Kwong Over a year ago

It should do nothing with coroutine, could you briefly describe the changes?

Novfensec · Accepted Answer · 2022-03-20 11:02:09Z

0

Try this: views.py

def main(request):
    ...
    ...
    data = {"TableForm": TableForm, "devicelist": devicelist_1}

    if request.method=='GET':
        csv = process_file(url)
        response = HttpResponse(csv, content_type='text/csv')
        response['Content-Disposition'] = 'attachment; filename='+filename
        return response

    return redirect('Url_NAME', data)

edited Mar 20, 2022 at 11:02

answered Mar 20, 2022 at 9:05

Novfensec

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2 Comments

Shi Jie Tio Over a year ago

Hi , the download function is work but i dunno why the redirect function didn't work at all (return redirect('/ProductList/BetaTest', data))

Novfensec Over a year ago

I think You need to give the name of the path you specified for this in urls.py , i.e. return redirect('name for Url',data)

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