django - 是否有让我设置上下文变量的Django模板标签？

Question

我希望能够将模板中的变量设置为字符串值。我写了一个标签，但是它似乎并没有改变上下文。预期用途是：

{% define "a string" as my_var %}

更新（已解决）：

class DefineNode(Node):
    def __init__(self, var, name):
        self.var = var
        self.name = name

    def __repr__(self):
        return "<DefineNode>"

    def render(self, context):
        context[self.name] = self.var
        return ''

@register.tag
def define(parser, token):
    """
    Adds a name to the context for referencing an arbitrarily defined string.

    For example:

        {% define "my_string" as my_string %}

    Now anywhere in the template:

        {{ my_string }}
    """
    bits = list(token.split_contents())
    if (len(bits) != 4 or bits[2] != "as") or \
        not (bits[1][0] in ('"', "'") and bits[1][-1] == bits[1][0]):
        raise TemplateSyntaxError("%r expected format is '\"string\" as name'" % bits[0])
    else:
        value = bits[1][1:-1]
    name = bits[3]
    return DefineNode(value, name)

Answer 1

您无需编写自己的标签。内置的{% with %}标记执行此操作。