WTForms Flask ValueError : View 함수가 응답을 반환하지 않았습니다.

Question

이 오류가 계속 발생하며 문제가 무엇인지, 특히 양식이 제출시 유효성을 검사하지 않는 이유를 알아낼 수 없습니다. 내 모든 다른 형태로 잘 작동합니다. 어떤 도움을 주셔서 감사합니다.

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') 

내 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')) 

그리고 forms.py에서

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) 

양식 정의 : 여기

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 

내 model.py입니다 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">&times;</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> 

Answer 1

if form.validate_on_submit(): 

이 if 문이 None 실패하면가 반환됩니다.

뷰 기능에 매우 return abort(400)

Answer 2

역 추적 점처럼 끝에 위해 fallthrough를 추가합니다. 처음에는 폼 처리가 엉망이고 값을 반환하지 않는 것처럼 보입니다. 최선의 방법은 작업 예제를보고 작성한 것과 비교하는 것입니다.

다음은 빈 양식을 렌더링하고 단일보기에서 제출을 처리하는 방법의 예입니다. 사용자가 작성하는 것이 어떻게 작동하는지

@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) 

...

1. 없이 포스트 경우, 빈 양식을 렌더링합니다.
2. 사용자가 제출하면 db 세션을 추가하고 커밋하고 사용자를 리디렉션합니다.