Django:自定义模板标记Node中未定义"全局名称'xxx'

Question

我已经创建了一个自定义模板标签,并希望在我的template.Node中有一个帮助器方法,但是当我调用辅助方法时,我得到了错误,

global name 'prepend_to_some_str' is not defined

这是导致错误的代码.

from django import template
from django.template.loader import render_to_string
from easy_maps.models import Address
register = template.Library()

@register.tag
def foo(parser, token):
    params = token.split_contents()
    return FooNode(params[1])

class FooNode(template.Node):
    def __init__(self, some_str):
        self.some_str = template.Variable(some_str)

    def prepend_to_some_str(some_str):
        return "foo" + some_str

    def render(self, context):
        try:
            some_str = self.some_str.resolve(context)

            context.update({
                'full_str': prepend_to_some_str(some_str),
            })
            return render_to_string('foo.html', context_instance=context)
        except template.VariableDoesNotExist:
            return ''

当然,如果我将辅助方法prepend_to_some_str移动到全局范围,它就可以正常工作,如下面的代码所示.

from django import template
from django.template.loader import render_to_string
from easy_maps.models import Address
register = template.Library()

@register.tag
def foo(parser, token):
    params = token.split_contents()
    return FooNode(params[1])

def prepend_to_some_str(some_str):
    return "foo" + some_str

class FooNode(template.Node):
    def __init__(self, some_str):
        self.some_str = template.Variable(some_str)

    def render(self, context):
        try:
            some_str = self.some_str.resolve(context)

            context.update({
                'full_str': prepend_to_some_str(some_str),
            })
            return render_to_string('foo.html', context_instance=context)
        except template.VariableDoesNotExist:
            return ''

有谁知道为什么FooNode在全局范围内寻找prepend_to_some_str而不是导致错误的代码中的类范围？

谢谢.

Answer 1

您应该将其定义self为第一个参数,并调用如下:self.prepend_to_some_str(some_str)