Question

因此，我尝试添加保存在指定目录中的图像名称，并将其添加到数据库中。但是此错误不断出现。尽管图像一直保存在指定目录中。这是我所有的文件Models.py

class Tickets(db.Model):
  id = db.Column(db.Integer,primary_key=True)
  title = db.Column(db.String(100),nullable=False)
  ticket_text = db.Column(db.Text,nullable=False)
  date_posted = db.Column(db.DateTime,nullable=False,default=datetime.utcnow)
  status = db.Column(db.String(30), nullable=False)
  priority = db.Column(db.String(30), nullable=False)
  created_by_id = db.Column(db.Integer, nullable=False)
  expert_id = db.Column(db.Integer, db.ForeignKey('users.id'),nullable=False)
  project_id = db.Column(db.Integer, db.ForeignKey('projects.id'),nullable=False)
  comment = db.relationship('Comment', backref='title', lazy='dynamic')
  attach = db.relationship('Attachment', backref='ticket', lazy='dynamic')

class Attachment(db.Model):
  id = db.Column(db.Integer, primary_key=True)
  file = db.Column(db.String(140))
  ticket_id = db.Column(db.Integer, db.ForeignKey('tickets.id'), nullable=False)

routes.py

@app.route('/ticket/<ticket_id>',methods=['GET','POST'])
@login_required
def ticket(ticket_id):
    ticket = Tickets.query.get_or_404(ticket_id)
    com = Comment.query.filter_by(ticket_id=ticket.id).first()
    form = CommentForm()
    attachform = AttachForm()
    if form.validate_on_submit() and form.body.data:
        comment = Comment(body=form.body.data,ticket_id=ticket_id,author = current_user.username)
        db.session.add(comment)
        db.session.commit()
        flash('Your comment has been published.')
        return redirect(url_for('ticket', ticket_id=ticket_id))
    if attachform.validate_on_submit():
        if attachform.file.data:
            picture_file = save_file(attachform.file.data)
            attachment = Attachment(file=picture_file,ticket_id=ticket_id)
            db.session.add(attachment)
            ticket.attach = picture_file
        db.session.commit()
        flash('Your file has been published.')
        return redirect(url_for('ticket', ticket_id=ticket_id))
    file = url_for('static', filename='files/' + str(ticket.attach))
    return render_template('ticket.html', title=ticket.title,file=file ,ticket=ticket,form=form,comment=com,attachform=attachform)

此行出现错误

ticket.attach = picture_file

Answer 1

当ticket_id应该为整数（键）时，您将其作为字符串传递：

尝试：

@app.route('/ticket/<int:ticket_id>',methods=['GET','POST'])
@login_required
def ticket(ticket_id):
    # or use ticket_id = int(ticket_id)
    ...

Answer 2

我认为您应该使用外部联接用Tickets查询Attachment。

ticket = db.session.query(Tickets, Attachment).outerjoin(Attachment, Tickets.id == Attachment.tickets_id).get_or_404(ticket_id)

此查询后，您需要像这样访问表。

ticket.Tickets.xxx
ticket.Attachments.xxx

因此，您将附件文件设置为ticket.Attachments。

ticket.Attachments.tickets_id == tickets_id
ticket.Attachments.file = picture_file

如果ticket.Attachments为无，

tichet.Attachment = attachment

Python AttributeError：“ str”对象没有属性“ _sa_instance_state”

2 个答案: