e Multiple file upload with flask built in uploader

Question

Uploading Files in flask has been explained in the docs properly. But I was wondering if the same built-in flask file upload can be used for multiple uploads. I went through this answer but I couldn't get it done. It says "flask" not defined. Not sure if I am missing some modules to import or just I don't know to use method getlist of flask.request.files .

My form looks like:

<form action="" method=post enctype=multipart/form-data>
    <input type=file name="file[]" multiple>
    <input type=submit value=Upload>
</form>

and the route is like:

@app.route('/', methods=['GET', 'POST'])
def upload_file():
if request.method == 'POST':
    files = request.files.getlist['file[]']
    for file in files:
        if file and allowed_file(file.filename):
            #filename = secure_filename(file.filename)
            upload(filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
        return redirect(url_for('uploaded_file',
                                filename=filename))

if I replace file with "file[]" will it work? I can select multiple files doing so but flask accepts and prints only one file selected and uploads only one. Looks like I am missing something silly here.

=====EDITED======

I edited above route with suggestion below.

=====ADDITION====

One more function was necessary to keep the filename iterating and saving it.

def upload(filename):
    filename = 'https://localhost/uploads/' + filename

and calling this function inside for loop above. Did the job!

Not sure if its a genuine solution but it did the trick.

files = request.files['file[]'] should be files = request.files.getlist('file[]') — Sean Vieira
– Sean Vieira, Commented Jul 23, 2013 at 6:54

Sean Vieira · Accepted Answer · 2013-07-23 06:13:27Z

7

You'll want to call the getlist method of request.files (which is an instance of werkzeug.datastructures.MultiDict):

files = request.files.getlist('file')
for file in files:
    hande_file(file)

handle_file might be implemented like this:

def handle_file(f):
    if not allowed_file(f.filename):
        return

    filename = secure_filename(f.filename)
    f.save(os.path.join(app.config['UPLOAD_FOLDER'], filename)

edited Jul 23, 2013 at 6:13

answered Jul 23, 2013 at 5:42

Sean Vieira

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7 Comments

Chandan Gupta Over a year ago

is above "if file and allowed_file...." loop going to be inside of the for loop you mentioned here?

Sean Vieira Over a year ago

@ChandanGupta - yes. handle_file would have all of the logic in your method up to, but not including the redirect (which would go outside of the for loop.

Chandan Gupta Over a year ago

it says NameError: global name 'handle_file' is not defined. what module do I need to import import <what??> to get getlist and request.files?

Sean Vieira Over a year ago

@ChandanGupta - yes - that is true - you will need to create that function or replace the fake call with your saving logic ;-)

Sean Vieira Over a year ago

And you don't need to import anything else to have access to request.files.getlist('some_name').

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