如何在Flask中呈现Select字段给错误两个多值来解包？

Question

应用程序代码：用于制作表单

branch_choices = [('CSE','CSE'),('ECE','ECE'),('MEC','MEC'),('CIVIL','CIVIL')]
year_choices = [('1st','1st'),('2nd','2nd'),('3rd','3rd'),('4th','4th')]

class CSIForm(Form):
    branch = SelectField('Branch',choices=branch_choices, validators=[Required()])
    year = SelectField('Year',choices=year_choices, validators=[Required()])

def index():
    form=CSIForm()
    return render_template('form.html',form=form)

HTML代码：用于将代码呈现为HTML

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Answer 1

choices需要是元组的列表，而不是字符串的列表。在

请参阅文档：http://wtforms.readthedocs.org/en/latest/fields.html#wtforms.fields.SelectField

您的代码可以这样更新：

class CSIForm(Form):
    branch_choices = [('CSE','CSE'),('ECE','ECE'),('MEC','MEC'),('CIVIL','CIVIL')]
    year_choices = [('1st','1st'),('2nd','2nd'),('3rd','3rd'),('4th','4th')]
    branch = SelectField('Branch',choices=branch_choices, validators=[Required()])
    year = SelectField('Year',choices=year_choices, validators=[Required()])