我一直收到此错误，但我无法弄清楚问题是什么 - 特别是为什么表单在提交时没有验证。我所有其他表格都工作正常。任何帮助，不胜感激。
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 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)
表单定义来自 forms.py：
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'))
和 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>
if form.validate_on_submit():
如果此 if 语句失败None则返回。
在末尾添加一个fallthrough，如下所示return abort(400)
回溯指向视图函数。乍一看，您的表单处理似乎一团糟，并且您没有返回任何值。 我认为你最好的选择是看一个工作示例并将其与您写的内容进行比较。
下面是如何在单个视图中呈现空白表单和处理提交的示例。
@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)
它是如何工作的...
- 如果没有帖子，则呈现一个空表单供用户填写。
- 如果用户提交，则添加并提交数据库会话并重定向用户。