Question

我正在尝试在烧瓶中制作动态表格。我遵循documentation on dynamic forms，一切顺利。我不喜欢这个布局。该文档显示了从父类创建表单类，然后在视图中为其添加属性。我认为可以创建一个窗体类，并向其传递一个值列表，以便在实例化时动态为其设置属性。

执行此操作时，出现错误 “ wtforms.fields.core.UnboundField对象”没有属性...然后设置缺少的任何属性，然后弹出一个新属性。因此感觉像是hack子，感觉不正确。

我的第一次尝试：

class PathsForm(FlaskForm):

    def __init__(self, paths, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.paths = paths

        i=0
        row_list = []
        for path in self.paths:
            param_name = 'param_{}'.format(str(i))
            custom_param_name = 'custom_param_{}'.format(str(i))
            path_name = 'path_{}'.format(str(i))

            parameter = SelectField('Parameter', choices = [('',''),
                                                    ('choice_1', 'Choice 1'),
                                                    ('choice_2', 'Choice 2'),
                                                    ])
            parameter.id = param_name

            custom_parameter = StringField('Custom Parameter')
            custom_parameter.id = custom_param_name

            path_field = SelectField('Path')
            path_field.choices = [('','')]+[(path,path) for path in self.paths]

            setattr(self, param_name, parameter)
            setattr(self, custom_param_name, custom_parameter)
            setattr(self, path_name, path_field)

            row_list.append((param_name, custom_param_name, path_name))
            i += 1
        self.row_list = row_list
    cbt_id = HiddenField('CBT ID', validators = [DataRequired()])
    submit = SubmitField('Submit')

我能够使表格在第二次尝试时呈现，但是它将所有名称和ID设置为均等，这给验证造成了严重破坏。我可以通过设置类属性并将其动态传递给表单来实现。

第二次尝试：

class PathsForm(FlaskForm):
    parameter = SelectField('Parameter', choices = [('',''),
                                                    ('choice_1', 'Choice 1'),
                                                    ('choice_2', 'Choice 2'),
                                                    ])
    custom_parameter = StringField('Custom Parameter')
    path_field = SelectField('Path')

    def __init__(self, paths, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.paths = paths

        i=0
        row_list = []
        for path in self.paths:
            param_name = 'param_{}'.format(str(i))
            custom_param_name = 'custom_param_{}'.format(str(i))
            path_name = 'path_{}'.format(str(i))

            self.path_field.choices = [('','')]+[(path,path) for path in self.paths]

            setattr(self, param_name, self.parameter)
            setattr(self, custom_param_name, self.custom_parameter)
            setattr(self, path_name, self.path_field)

            row_list.append((param_name, custom_param_name, path_name))
            i += 1
        self.row_list = row_list
    cbt_id = HiddenField('CBT ID', validators = [DataRequired()])
    submit = SubmitField('Submit')

问题：

wtforms.fields.core.UnboundField对象是什么意思，为什么在第一个示例中而不是第二个示例中得到它？
是否可以做我想做的事情？还是应该回到文档中如何在视图功能中看到所有这些内容？

感谢您的任何反馈。

烧瓶动态表单“ wtforms.fields.core.UnboundField对象”没有属性

0 个答案: