使用 FieldList 和 FormField

本文介绍了使用 FieldList 和 FormField的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我们有以下表单，我们正在尝试为每个组创建 GroupRoleForms 列表.

We have the following forms and we are trying to create list of GroupRoleForms for each group.

class FullNameMixIn():
    full_name = TextField(
        'Full name', [
            validators.required(message=u"Full name is required")
        ])

class GroupRoleForm(Form):
    group =BooleanField('Group', default=False)
    role = SelectField(
            'Role',choices=[
            ("none", "----------"), 
            ('approver', 'Approver'),
            ('editor', 'Editor')
            ])

class AdminEditUserForm(Form, FullNameMixIn):
    group_roles = FieldList(FormField(GroupRoleForm))

我们如何创建一个 AdminEditUserForm 实例，其中包含一个预先填充的 GroupRoleForms 列表?

How can we create a AdminEditUserForm instance that contains a pre-populated list of GroupRoleForms?

目前我们正在尝试这样做:

At the moment we are trying to do it this way:

form = forms.AdminEditUserForm()
for group in  company.groups:
    group_role_form = forms.GroupRoleForm()
    group_role_form.group.label =  group.name
    group_role_form.group.name = group.id
    form.group_roles.append_entry(group_role_form)
return dict(edit_user_form = form )

说明

在 Form 的 data 或 formdata 关键字参数中，您只需要一个带有 key 的字典匹配包含可迭代对象的 FieldList 子字段.该可迭代项中的项目反过来需要具有与 FieldList 的字段列表匹配的属性的项目.

Explanation

In your data or formdata keyword arguments for the Form you just need an dictionary with a key that matches the FieldList subfield that contains an iterable. The items in that iterable need in turn have items w/ attributes that match with FieldList's list of fields.

如果您按照下面的示例进行操作，我会得到预先填充好的嵌套表单.

If you follow the example below I get nested Forms that are pre-populated just fine.

from collections import namedtuple

from wtforms import validators
from wtforms import Form
from wtforms import SelectField
from wtforms import BooleanField
from wtforms import TextField
from wtforms import FieldList
from wtforms import FormField

from webob.multidict import MultiDict

# OP's Code
class FullNameMixIn():
    full_name = TextField(
        'Full name', [
            validators.required(message=u"Full name is required")
        ])

class GroupRoleForm(Form):
    group =BooleanField('Group', default=False)
    role = SelectField(
            'Role',choices=[
            ("none", "----------"), 
            ('approver', 'Approver'),
            ('editor', 'Editor')
            ])

class AdminEditUserForm(Form, FullNameMixIn):
    group_roles = FieldList(FormField(GroupRoleForm))

# create some groups
Group = namedtuple('Group', ['group', 'role'])
g1 = Group('group-1', 'none')
g2 = Group('group-2', 'none')

# drop them in a dictionary 
data_in={'group_roles': [g1, g2]}

# Build form 
test_form = AdminEditUserForm(data=MultiDict(data_in))

# test print
print test_form.group_roles()

呈现的 HTML(截断)

<ul id="group_roles">
   <li>
      <label for="group_roles-0">Group Roles-0</label> 
      <table id="group_roles-0">
         <tr>
            <th><label for="gr
               oup_roles-0-group">Group</label></th>
            <td><input checked id="group_roles-0-group" name="group_roles-0-group" type="checkbox" value="y"><
               /td>
         </tr>
         <tr>
            <th><label for="group_roles-0-role">Role</label></th>
            <td>
               <select id="group_roles-0-role" name="group_roles-0-role">
                  <option
                     selected value="none">----------</option>
                  <option value="approver">Approver</option>
                  <option value="editor">Editor</option>
               </select>
            </td
               >
         </tr>
      </table>
   </li>
   <li>
      <label for="group_roles-1">Group Roles-1</label> 
      <table id="group_roles-1">
         <tr>
            <th><label for="group_roles-1-gro
               up">Group</label></th>
            <td><input checked id="group_roles-1-group" name="group_roles-1-group" type="checkbox" value="y"></td>
         </tr>
         <tr>
            <t
               h>
            <label for="group_roles-1-role">Role</label></th>
            <td>
               <select id="group_roles-1-role" name="group_roles-1-role">
                  <option selected value
                     ="none">----------</option>
                  <option value="approver">Approver</option>
                  <option value="editor">Editor</option>
               </select>
            </td>
         </tr>
      </table>
      <
      /li>
</ul>

...

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FieldList