我一直收到这个错误，我无法弄清问题是什么 - 具体来说，为什么表单在提交时没有验证。我所有的其他形式都很好。任何帮助表示赞赏。
Error:
2014-02-28 15:21:26,581 :Exception on /add_item [POST]
Traceback (most recent call last):
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 1361, in full_dispatch_request
response = self.make_response(rv)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1439, in make_response
raise ValueError('View function did not return a response')
ValueError: View function did not return a response
这是我的model.py：
class Track(db.Model):
__tablename__ = 'track'
id = db.Column(db.Integer, primary_key=True)
date = db.Column(db.Date)
station_start = db.Column(db.Float)
station_end = db.Column(db.Float)
quantity = db.Column(db.Float)
img = db.Column(db.String(200))
caption = db.Column(db.String(600))
area_id = db.Column(db.Integer, db.ForeignKey('area.id'))
location_id = db.Column(db.Integer, db.ForeignKey('location.id'))
shift_id = db.Column(db.Integer, db.ForeignKey('shift.id'))
material_id = db.Column(db.Integer, db.ForeignKey('material.id'))
def __init__(self, date, station_start, station_end, quantity, img, caption):
self.date = date
self.station_start = station_start
self.station_end = station_end
self.quantity = quantity
self.img = img
self.caption = caption
def get_id(self):
return unicode(self.id)
forms.py中的表单定义：
class TrackingForm(Form):
date = DateField('Date (MM/DD/YYYY)', validators=[Required()], format='%m/%d/%Y')
station_start = FloatField('Starting Station (XX.XX)')
station_end = FloatField('Ending Station (XX.XX)')
quantity = FloatField('Quantity')
img = FileField('Image')
caption = TextAreaField('Description')
area = QuerySelectField(query_factory=getAllAreas, get_label='area')
location = QuerySelectField(query_factory=getAllLocations, get_label='location')
shift = QuerySelectField(query_factory=getAllShifts, get_label='shift')
material = QuerySelectField(query_factory=getAllMaterials, get_label='material')
我的views.py:
@app.route("/add_item", methods=["POST"])
@login_required
def add_item():
form = TrackingForm()
if form.validate_on_submit():
img_file = form.img.data
if img_file and allowed_file(img_file.filename):
img_filename = secure_filename(str(uuid.uuid4()) + img_file.filename)
img_file.save(os.path.join(app.config['UPLOAD_FOLDER'], img_filename))
else:
img_filename = ""
t = Track(date = form.date.data,
station_start = form.station_start.data,
station_end = form.station_end.data,
quantity = form.quanitity.data,
img = img_filename,
caption = form.caption.data)
db.session.add(t)
db.session.commit()
form_location = form.location.data
l = Location.query.filter_by(location = form_location.location).first()
l.tracks.append(t)
db.session.commit()
form_area = form.area.data
a = Area.query.filter(Area.area == form_area.area).first()
a.tracks.append(t)
db.session.commit()
form_material = form.material.data
m = Material.query.filter_by(material = form_material.material).first()
m.tracks.append(t)
db.session.commit()
return redirect(url_for('daily_report'))
return redirect(url_for('daily_report'))
HTML：
<div class="modal fade" id="add_item_form">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Add to Report</h4>
</div>
<div class="modal-body">
<div class="container">
<div class="col-lg-3">
<form action="/add_item" method="POST" enctype="multipart/form-data" class="form-default">
{{ form.hidden_tag() }}
{% call macro.form_field(form.date) %} {% endcall %}
<div class="input-group input-group">
<span class="input-group-addon">Area</span>
{% call macro.form_field(form.area) %} {% endcall %}
{% call macro.form_field(form.location) %} {% endcall %}
</div>
<p>
<div class="input-group input-group">
<span class="input-group-addon">Material: </span>
{% call macro.form_field(form.material) %} {% endcall %}
</div>
</p>
{% call macro.form_field(form.station_start) %} {% endcall %}
{% call macro.form_field(form.station_end) %} {% endcall %}
{% call macro.form_field(form.quantity) %} {% endcall %}
{% call macro.form_field(form.img) %} {% endcall %}
{% call macro.form_field(form.caption) %} {% endcall %}
<input type="submit" value="Submit" class="btn btn-primary">
</form>
</div>
</div>
</div>
</div>
</div>
</div>
答案 0 :(得分：4)
if form.validate_on_submit():
如果此if语句失败，则返回None。
在最后添加一个初始值，如return abort(400)
答案 1 :(得分：0)
回溯指向视图功能。首先，它看起来像你的表单处理是一团糟，你没有返回任何值。我认为你最好的办法是看一个有效的例子并将其与你所写的内容进行比较。
以下是一个如何渲染空白表单并在单个视图中处理提交的示例。
@app.route('/create', methods=['GET', 'POST'])
@login_required
def create_post():
form = PostForm()
if form.validate_on_submit():
aid = current_user.id
url = slugify(form.title.data)
tags = tagify(form.tags.data)
post = Post(title=form.title.data, author_id=aid, url=url, pub_date=form.pub_date.data, body=form.body.data, topic=form.topic.data, tags=tags)
db.session.add(post)
db.session.commit()
Topic.update_counts()
flash('Your post has been published.')
return redirect(url_for('display_post', url=url))
posts = Post.query.all()
return render_template('create_post.html', form=form, posts=posts)
它如何运作......