Django resolve_variable有什么作用?(模板.变量) [英] What does django resolve_variable do? (template.Variable)

问题描述

resolve_variable 有什么作用?我可以用它来访问视图外部的 request 吗?

What does resolve_variable do? And could I use it for accessing the request outside of the view?

所以 template.Variable 是正确的方法-但我仍然不确定其目的.该文档并没有真正的帮助.

So template.Variable is the correct way to go - but I'm still unsure of its purpose. The documentation doesn't really help.

干杯们.

推荐答案

我假设您尝试在此处编写自定义模板标签，所以这就是您要做的事情.

I'm assuming your trying to write a custom template tag here, so here's what you do.

在编译功能中，您可以像这样绑定变量:

In your compilation function, you bind the variable like so:

@register.tag
def my_tag(parser, token):
    # This version uses a regular expression to parse tag contents.
    try:
        # Splitting by None == splitting by spaces.
        tag_name, var_name = token.contents.split(None, 1)
    except ValueError:
        raise template.TemplateSyntaxError, "%r tag requires arguments" % token.contents.split()[0]
    #this will "bind" the variable in the template to the actual_var object
    actual_var = template.Variable(var_name)
    return MyNode(template_variable)


class MyNode(template.Node):
    def __init__(self, actual_var):
        self.actual_var = actual_var

    def render(self, context):
        actual_var_value = self.actual_var.resolve(context)
        #do something with it
        return result

如果只想访问请求，则直接在节点中绑定变量.确保您在上下文中有请求:

If you only want access the request, you bind against the variable directly in the node. Make sure you have the request in the context:

from django.template import RequestContext
def my_view(request):
    #request stuff
    return render_to_response("mytemplate.html", {'extra context': None,}, context_instance=RequestContext(request))

然后输入您的模板标签代码.

Then in your template tag code.

@register.tag
def simple_request_aware_tag(parser, token):
    return SimpleRequestAwareNode()

class SimpleRequestAwareNode(template.Node):
    def render(self, context):
        request = template.Variable('request').resolve(context)
        #we want to return the current username for example
        return request.user.get_full_name()

这篇关于Django resolve_variable有什么作用?(模板.变量)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！