在Pyramid中使用FormEncode的ForEach和嵌套变量创建表单项数组

Question

我正在使用Pyramid和FormEncode来创建和验证地址列表。我用的是pyramid_simpleform，并且查看了这个教程 http://jimmyg.org/blog/2007/multiple-checkboxes-with-formencode.html 以及之前的一个问题 Pylons FormEncode with an array of form elements，但我仍然遇到了一些问题。我的结构目前是这样的：

模式：

from formencode import Schema, validators, ForEach, NestedVariables

class AddressSchema(Schema):
allow_extra_fields = False
addresses = validators.String(not_empty=True)

class JobSchema(Schema):
filter_extra_fields = True
allow_extra_fields = True
pre_validators = [NestedVariables()]
job_name = validators.MinLength(5, not_empty=True)
comments = validators.MinLength(5, not_empty=False)
addresses = ForEach(AddressSchema())

模板：

${renderer.errorlist("addresses")}
${renderer.errorlist("job_name")}

<p><label for="job_name">Job name: </label>${renderer.text("job_name", size=30)}</p>
% for a in range(1, initial_number_of_address_fields):
    <p><label for="addresses-${a}">Address: </label>${renderer.textarea("addresses-" + str(a), cols=39, rows=6)}</p>
% endfor
${renderer.submit("submit", "Submit")}

视图：

@view_config(route_name='add_addresses', renderer="add_addresses.mak")
def add_addresses(request):

from myproject.forms import JobSchema
from myproject.models import Job
from formencode import htmlfill, variabledecode, ForEach

initial_number_of_address_fields = 5

form = Form(request, schema=JobSchema(), variable_decode=False)
renderer = FormRenderer(form)

# if the form has been submitted
if 'submit' in request.POST:

    if form.validate(): # uses validation specified in forms.py

        # automatically bind to provided form
        obj = form.bind(Job()) # no exisiting id provided, so a new document is created
        # add some additional values
        obj.__setattr__("last_updated_on", datetime.date.today().strftime('%Y/%m/%d'))
        #save
        obj.save()
        return HTTPFound(location="/")

return {
    'title':'Add addresses',
    'initial_number_of_address_fields': initial_number_of_address_fields, 
    'renderer': renderer
}

我收到了一些实际的验证错误，像这样：

{'addresses': u'Missing value'}

但是即使是填写正确的值也会出现错误：

输入必须是字典类型（而不是：u'dgfgfd'）

如果我把 variable_decode 改为 True（在表单变量设置中），我就完全不再收到任何错误了。我觉得我应该以某种方式使用 variable_decode，但我不太确定该怎么做。请问我该如何正确验证这些值呢？

pyramid formencode forminput forminputvalidation addresslist nestedvariables formarrays validationerrors

在Pyramid中使用FormEncode的ForEach和嵌套变量创建表单项数组

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