Saving multiple files through flask and wtforms MultipleFileField

Question

I am trying to get and save several files from request in Flask using MultipleFileField. But the problem is that I can't iterate through it. What I mean:
Form class

class TestForm(FlaskForm):
    user_id = IntegerField('user_id', validators=[DataRequired()])
    name = StringField('name', validators=[DataRequired()])
    description = StringField('description', validators=[DataRequired()])
    category_id = IntegerField('category_id', validators=[DataRequired()])
    date_of_purchase = DateField('date_of_purchase', validators=[DataRequired()])
    guarantee_period = IntegerField('guarantee_period', validators=[DataRequired()])
    files = MultipleFileField('files')

And view code:

form = TestForm()
...
files = form.files
for file in files:
   with open(path.join('some_path', file.filename), 'wb') as f:
        f.write(file.read())

I get this massive in request:

["<_io.BufferedReader name='1.jpg'>", "<_io.BufferedReader name='2.jpg'>"]

But I get the error:

AttributeError: 'str' object has no attribute 'filename'

So it converts io.BufferedReader to str. What can I do to fix this problem?

I haven't used `MultipleFileField` but with `FileField` all you need to do is `form.file.data.save(path)`. Does that work in this case (e.g. inside your loop just do a `file.data.save(path)` or something similar)? — noslenkwah, Sep 02 '20 at 18:35
@noslenkwah in this case `form.file.data` returns the list with `io.BufferedReader` converted to string — GoshkaLP, Sep 02 '20 at 18:42
I tried it out. I found the answer [here](https://stackoverflow.com/a/55733307/4032503) — noslenkwah, Sep 02 '20 at 20:28

Richard Fogaca Nienkotter · Accepted Answer · 2020-09-02T22:13:52.007

0

Your 'file' is a string, slice it before the with statement and save to a filename variable, then include just 'filename' inside the with statement. Something like:

form = TestForm()
...
files = form.files.data
for file in files:
   with open(path.join('some_path', file), 'wb') as f:
        f.write(file.read())

edited Sep 02 '20 at 22:13

answered Sep 02 '20 at 18:43

Richard Fogaca Nienkotter

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It doesn't help( The erorr is `TypeError: 'MultipleFileField' object is not iterable` – GoshkaLP Sep 02 '20 at 18:46
I just edited the answer, .data brings all content from the form as a list, this might be what you need – Richard Fogaca Nienkotter Sep 02 '20 at 22:13
1

Hm, I tried your code again today in the morning and it works great... I just can't imagine what was the problem yesterday) – GoshkaLP Sep 03 '20 at 07:20

Saving multiple files through flask and wtforms MultipleFileField

1 Answers1