Form Data not refreshing with newest entries

问题

When I add a new customer in customer table and access AddOrderForm form, I don't get the new customer in the choices.But on server restart I am able to get the new customer in the choices list.Any reason ?

Customer Table

class Customer(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     email = db.Column(db.String(120), unique=True)
     mobile_num = db.Column(db.String(13), unique=True)
     name = db.Column(db.String(120))
     marketing_source = db.Column(db.String(120))
     date_of_birth = db.Column(db.DateTime)
     gender = db.Column(db.String(13))
     store_id = db.Column(db.Integer, db.ForeignKey('store.id'))

     def __init__(self,email,mobile_num,name,marketing_source,date_of_birth, gender,store_id):
         self.email = email
         self.mobile_num = mobile_num
         self.name = name
         self.marketing_source = marketing_source
         self.date_of_birth = date_of_birth
         self.gender = gender
         self.store_id = store_id
     def __repr__(self):
          return '%r, %s ' % (self.name.encode('utf-8'), self.mobile_num)

AddOrderForm

class AddOrderForm(Form):
    order_id  = TextField('Website Order Id', [validators.length(min=4, max=120)])
    item_name = TextField('Item Name', [validators.length(min=4, max=120)])
    item_cost = DecimalField('Item Cost' , [validators.Required()])
    custmer_id = SelectField('Customer',coerce=int,choices= convert_list_wtforms_choices(Customer.query.all()))
    order_category = SelectField('Order Category',coerce=int,choices=[(1,'Mobiles'), (2,'Clothing')])
    linq_shipping_cost =  DecimalField('Linq Shipping Cost' , [validators.Required()])
    website_shipping_cost = DecimalField('Website Shipping Cost' , [validators.Required()])
    advance_amount = DecimalField('Advance Amount' , [validators.Required()])
    website = SelectField('Website', coerce=int,choices=[(1,'Amazon'), (2,'Flipkart')] )
    other = TextField('Any Other Information')

While accessing the form from a view I don't get the latest added customer in the custmer_id choices. Any idea to fix this?

回答1:

You're only setting the choices once, when you define the form. Instead, re-select them every time you instantiate the form.

class AddOrderForm(Form):
    customer_id = SelectField('Customer', coerce=int)

    def __init__(self, *args, **kwargs):
        super(AddOrderForm, self).__init__(*args, **kwargs)
        self.customer_id.choices = convert_list_wtforms_choices(Customer.query.all())

来源：https://stackoverflow.com/questions/39108641/form-data-not-refreshing-with-newest-entries