WTForms:FormField的FieldList无法加载嵌套数据 [英] WTForms: FieldList of FormField can't load nested data

问题描述

我在FieldList内的FormField内有一个自定义字段:位置

I have a custom field inside a FormField inside a FieldList: locations

class LocationForm(Form):
    id = HiddenField('id')
    title = StringField(_l('Title'), [Required()])
    location = CoordinatesField(_l('Coordinates'))

class ProjectForm(Form):
    title = StringField(_l('Title'))
    manager = StringField(_l('Manager'))
    description = StringField(_l('Description'))
    locations = FieldList(FormField(LocationForm), min_entries=1)

提交时，此表单将保存到这样的对象中:

This form when submited is saved to an object like this:

document = {
    'title': unicode,
    'description': unicode,
    'manager': unicode,
    'locations': [{
        'id': uuid.UUID,
        'title': unicode,
        'location': {'coordinates':[float], 'text':unicode}
        }],
    }

当我尝试将数据加载到GET处理程序的表单中时，一切但位置都很好:

When I try to load the data in to the form for a GET handler, everything but the locations loads fine:

f = form(MultiDict(document))
f.locations.data
>> {'id':'','title':'','location':''}

我进行了一些调试，发现WTForms在将文档数据加载到表单中时搜索了"locations-0-location"，但是搜索了MultiDict()但该键不存在.MultiDict不会将字典列表转换为键"locations-i -...".

I did some debugging and found that WTForms while loading the document's data in to the form searches for 'locations-0-location' but MultiDict() but that keys doesn't exists. MultiDict doesn't convert a list of dictionaries to the key 'locations-i-...'.

为这样的嵌套数据结构制作WTForm的正确方法是什么?

What is the right way to make a WTForm for such a nested data structure?

推荐答案

数据:

document = {
    'title': unicode,
    'description': unicode,
    'manager': unicode,
    'locations': [{
        'id': uuid.UUID,
        'title': unicode,
        'location': {'coordinates':[float], 'text':unicode}
        }],
    }

您使用WTFORMS设置数据结构:

you set the data structure with WTFORMS:

class LocationForm(Form):
    id = HiddenField('id')
    title = StringField(_l('Title'), [Required()])
    location = CoordinatesField(_l('Coordinates'))

class ProjectForm(Form):
    title = StringField(_l('Title'))
    manager = StringField(_l('Manager'))
    description = StringField(_l('Description'))
    locations = FieldList(FormField(LocationForm), min_entries=1)

尝试一下:

f = ProjectForm()
f.process(data=document)
f.locations.data

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