本文介绍了使用flask-uploads上传文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试使用 flask-uploads 扩展名上传文件.问题是，每当我似乎找到解决方案时，我都会资助另一个问题，并且我觉得文档晦涩难懂.
这是代码:
from flask.ext.uploads import UploadSet, IMAGES, configure_uploads
import os
from werkzeug import secure_filename
photos = UploadSet('photos', IMAGES)
configure_uploads(app, photos)
@app.route('/edit_book', methods = ['GET', 'POST'])
def edit_book():
form = BookForm()
if form.validate_on_submit():
b.summary = form.summary.data
if request.method == 'POST':
try:
secure_filename = photos.save(request.files['cover'])
except:
print 'not ok'
db.session.add(b)
db.session.commit()
return redirect('/admin')
return render_template('edit_book.html', title = 'Add a book', form = form )
当前错误仅给出:
KeyError: 'images'.
我仅此而已！在使用此扩展程序时是否会出现任何问题，因为在任何地方都找不到合适的代码来提供完整的解决方案(从上传开始到将文件保存在文件夹中).
预先感谢您的帮助.
模板代码
<!-- extend from admin layout -->
{% extends "admin.html" %}
{% block content %}
<form action="" method="post" name="edit_book" enctype="multipart/form-data">
{{form.hidden_tag()}}
{% if dico %}
<h1>Ajouter le livre <i>{{dico.title}}</i> à la base de données</h1>
{% else %}
{% set dico = [] %}
<h1>Ajouter un livre à la base de données</h1>
{% endif %}
<p>Titre (obligatoire) : {{form.title(value=dico.title)}}</p>
<p>ISBN 13 (EAN) : {{form.ean(value=dico.EAN)}}</p>
<p>ISBN : {{form.isbn(value=dico.ISBN)}}</p>
<p>Maison d'édition : {{form.publisher(value=dico.publisher)}}</p>
<p>epaisseur (cm) : {{form.thickness(value=dico.thickness)}}</p>
<p>longueur (cm) : {{form.length(value=dico.length)}}</p>
<p>largeur (cm) : {{form.width(value=dico.width)}}</p>
<p>masse (kg) : {{form.mass(value=dico.mass)}}</p>
<p>Nombre de pages : {{form.numberofpages(value=dico.pages)}}</p>
<p>Couverture du livre : {{form.cover(value=dico.img)}}</p>
<p>Quatrième de couverture : {{form.summary(cols="35", rows="20")|safe}}</p>
<p><input type="submit" value="Envoyez"></p>
</form>
{% endblock %}
错误Stacktrace
* Running on http://127.0.0.1:5000/
* Restarting with reloader
127.0.0.1 - - [22/Jul/2013 15:16:18] "POST /edit_book HTTP/1.1" 500 -
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1701, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1360, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1358, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1344, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/stephane/git/biblib-flask/app/views.py", line 117, in edit_book
if form.validate_on_submit():
File "/usr/local/lib/python2.7/dist-packages/flask_wtf/form.py", line 125, in validate_on_submit
return self.is_submitted() and self.validate()
File "/usr/local/lib/python2.7/dist-packages/wtforms/form.py", line 265, in validate
return super(Form, self).validate(extra)
File "/usr/local/lib/python2.7/dist-packages/wtforms/form.py", line 130, in validate
if not field.validate(self, extra):
File "/usr/local/lib/python2.7/dist-packages/wtforms/fields/core.py", line 176, in validate
stop_validation = self._run_validation_chain(form, chain)
File "/usr/local/lib/python2.7/dist-packages/wtforms/fields/core.py", line 196, in _run_validation_chain
validator(form, self)
File "/usr/local/lib/python2.7/dist-packages/flask_wtf/file.py", line 69, in __call__
if not self.upload_set.file_allowed(field.data, field.data.filename):
File "/usr/local/lib/python2.7/dist-packages/Flask_Uploads-0.1.3- py2.7.egg/flaskext/uploads.py", line 346, in file_allowed
return self.extension_allowed(extension(basename))
File "/usr/local/lib/python2.7/dist-packages/Flask_Uploads-0.1.3-py2.7.egg/flaskext/uploads.py", line 356, in extension_allowed
return ((ext in self.config.allow) or
File "/usr/local/lib/python2.7/dist-packages/Flask_Uploads-0.1.3-py2.7.egg/flaskext/uploads.py", line 308, in config
return current_app.upload_set_config[self.name]
KeyError: 'images'
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book? __debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=source.png HTTP/1.1" 200 -
我只是在更大范围内检查了代码，只发现了一个完全是'images'的东西:表单中的验证者.
from flaskext.uploads import UploadSet, IMAGES
images = UploadSet("images", IMAGES)
class BookForm(Form):
summary = TextAreaField('summary', [validators.optional()])
cover = FileField("cover", [validators.optional(),file_allowed(images, "Images only!")])
解决方案
问题是，您有两个上传集:一个用于views.py(照片)，一个用于forms.py(图像).您应该从app.py导入上传集photos.
此外，Flask-Uploads会调用secure_filename()来为您验证文件名，因此此行是不必要的:
from werkzeug import secure_filename
完整的演示在这里:
import os
from flask import Flask, render_template
from flask_uploads import UploadSet, configure_uploads, IMAGES, patch_request_class
from flask_wtf import FlaskForm
from flask_wtf.file import FileField, FileRequired, FileAllowed
from wtforms import SubmitField
app = Flask(__name__)
app.config['SECRET_KEY'] = 'I have a dream'
app.config['UPLOADED_PHOTOS_DEST'] = os.getcwd()
photos = UploadSet('photos', IMAGES)
configure_uploads(app, photos)
patch_request_class(app) # set maximum file size, default is 16MB
class UploadForm(FlaskForm):
photo = FileField(validators=[FileAllowed(photos, u'Image only!'), FileRequired(u'File was empty!')])
submit = SubmitField(u'Upload')
@app.route('/', methods=['GET', 'POST'])
def upload_file():
form = UploadForm()
if form.validate_on_submit():
filename = photos.save(form.photo.data)
file_url = photos.url(filename)
else:
file_url = None
return render_template('index.html', form=form, file_url=file_url)
if __name__ == '__main__':
app.run()
模板:
<h1>Photo Upload</h1>
<form method="POST" enctype="multipart/form-data">
{{ form.hidden_tag() }}
{{ form.photo }}
{% for error in form.photo.errors %}
<span style="color: red;">{{ error }}</span>
{% endfor %}
{{ form.submit }}
</form>
{% if file_url %}
<br>
<img src="{{ file_url }}">
{% endif %}
要点链接: https://gist.github.com/greyli/81d7e5ae6c9baf7f6cdfbf64e8>/p> I am trying to upload files using the flask-uploads extension.The problem is that, each time it seems I find a solution, I fund an other problem, and I feel the documentation cryptic. Here is the code : The current error give just : I have nothing more ! Does any one issue in using this extension, as I find no suitable piece of code anywhere that give a full solution (from the start of an upload to the saving of the file in a folder). Thank you in advance for your help.from flask.ext.uploads import UploadSet, IMAGES, configure_uploads
import os
from werkzeug import secure_filename
photos = UploadSet('photos', IMAGES)
configure_uploads(app, photos)
@app.route('/edit_book', methods = ['GET', 'POST'])
def edit_book():
form = BookForm()
if form.validate_on_submit():
b.summary = form.summary.data
if request.method == 'POST':
try:
secure_filename = photos.save(request.files['cover'])
except:
print 'not ok'
db.session.add(b)
db.session.commit()
return redirect('/admin')
return render_template('edit_book.html', title = 'Add a book', form = form )
KeyError: 'images'.
Template code
<!-- extend from admin layout -->
{% extends "admin.html" %}
{% block content %}
<form action="" method="post" name="edit_book" enctype="multipart/form-data">
{{form.hidden_tag()}}
{% if dico %}
<h1>Ajouter le livre <i>{{dico.title}}</i> à la base de données</h1>
{% else %}
{% set dico = [] %}
<h1>Ajouter un livre à la base de données</h1>
{% endif %}
<p>Titre (obligatoire) : {{form.title(value=dico.title)}}</p>
<p>ISBN 13 (EAN) : {{form.ean(value=dico.EAN)}}</p>
<p>ISBN : {{form.isbn(value=dico.ISBN)}}</p>
<p>Maison d'édition : {{form.publisher(value=dico.publisher)}}</p>
<p>epaisseur (cm) : {{form.thickness(value=dico.thickness)}}</p>
<p>longueur (cm) : {{form.length(value=dico.length)}}</p>
<p>largeur (cm) : {{form.width(value=dico.width)}}</p>
<p>masse (kg) : {{form.mass(value=dico.mass)}}</p>
<p>Nombre de pages : {{form.numberofpages(value=dico.pages)}}</p>
<p>Couverture du livre : {{form.cover(value=dico.img)}}</p>
<p>Quatrième de couverture : {{form.summary(cols="35", rows="20")|safe}}</p>
<p><input type="submit" value="Envoyez"></p>
</form>
{% endblock %}
Error Stacktrace
* Running on http://127.0.0.1:5000/
* Restarting with reloader
127.0.0.1 - - [22/Jul/2013 15:16:18] "POST /edit_book HTTP/1.1" 500 -
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1701, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1360, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1358, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1344, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/stephane/git/biblib-flask/app/views.py", line 117, in edit_book
if form.validate_on_submit():
File "/usr/local/lib/python2.7/dist-packages/flask_wtf/form.py", line 125, in validate_on_submit
return self.is_submitted() and self.validate()
File "/usr/local/lib/python2.7/dist-packages/wtforms/form.py", line 265, in validate
return super(Form, self).validate(extra)
File "/usr/local/lib/python2.7/dist-packages/wtforms/form.py", line 130, in validate
if not field.validate(self, extra):
File "/usr/local/lib/python2.7/dist-packages/wtforms/fields/core.py", line 176, in validate
stop_validation = self._run_validation_chain(form, chain)
File "/usr/local/lib/python2.7/dist-packages/wtforms/fields/core.py", line 196, in _run_validation_chain
validator(form, self)
File "/usr/local/lib/python2.7/dist-packages/flask_wtf/file.py", line 69, in __call__
if not self.upload_set.file_allowed(field.data, field.data.filename):
File "/usr/local/lib/python2.7/dist-packages/Flask_Uploads-0.1.3- py2.7.egg/flaskext/uploads.py", line 346, in file_allowed
return self.extension_allowed(extension(basename))
File "/usr/local/lib/python2.7/dist-packages/Flask_Uploads-0.1.3-py2.7.egg/flaskext/uploads.py", line 356, in extension_allowed
return ((ext in self.config.allow) or
File "/usr/local/lib/python2.7/dist-packages/Flask_Uploads-0.1.3-py2.7.egg/flaskext/uploads.py", line 308, in config
return current_app.upload_set_config[self.name]
KeyError: 'images'
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book? __debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
127.0.0.1 - - [22/Jul/2013 15:16:18] "GET /edit_book?__debugger__=yes&cmd=resource&f=source.png HTTP/1.1" 200 -
I just checked the code more largely, and find only one thing that is exactly 'images' :a validator in the forms.
from flaskext.uploads import UploadSet, IMAGES
images = UploadSet("images", IMAGES)
class BookForm(Form):
summary = TextAreaField('summary', [validators.optional()])
cover = FileField("cover", [validators.optional(),file_allowed(images, "Images only!")])
解决方案
The problem is, you have two upload set: one for views.py (photos), one for forms.py(images). You should import the upload set photos from your app.py.
Besides, Flask-Uploads will call secure_filename() to verify filename for you, so this line is unnecessary:
from werkzeug import secure_filename
A complete demo is here:
import os
from flask import Flask, render_template
from flask_uploads import UploadSet, configure_uploads, IMAGES, patch_request_class
from flask_wtf import FlaskForm
from flask_wtf.file import FileField, FileRequired, FileAllowed
from wtforms import SubmitField
app = Flask(__name__)
app.config['SECRET_KEY'] = 'I have a dream'
app.config['UPLOADED_PHOTOS_DEST'] = os.getcwd()
photos = UploadSet('photos', IMAGES)
configure_uploads(app, photos)
patch_request_class(app) # set maximum file size, default is 16MB
class UploadForm(FlaskForm):
photo = FileField(validators=[FileAllowed(photos, u'Image only!'), FileRequired(u'File was empty!')])
submit = SubmitField(u'Upload')
@app.route('/', methods=['GET', 'POST'])
def upload_file():
form = UploadForm()
if form.validate_on_submit():
filename = photos.save(form.photo.data)
file_url = photos.url(filename)
else:
file_url = None
return render_template('index.html', form=form, file_url=file_url)
if __name__ == '__main__':
app.run()
template:
<h1>Photo Upload</h1>
<form method="POST" enctype="multipart/form-data">
{{ form.hidden_tag() }}
{{ form.photo }}
{% for error in form.photo.errors %}
<span style="color: red;">{{ error }}</span>
{% endfor %}
{{ form.submit }}
</form>
{% if file_url %}
<br>
<img src="{{ file_url }}">
{% endif %}
Gist Link: https://gist.github.com/greyli/81d7e5ae6c9baf7f6cdfbf64e8a7c037
这篇关于使用flask-uploads上传文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！