django：传递自定义标签参数

发布于 2024-10-19 20:09:35 字数 1020 浏览 3 评论 0 原文

我正在尝试将变量从 URL（不是查询字符串）传递到自定义标记，但看起来在将其转换为 int 时遇到了 ValueError 。乍一看，它是以像“project.id”这样的字符串形式出现的，而不是它的实际整数值。据我了解，标签参数始终是字符串。如果我在发送之前打印出视图中的参数值，则它看起来是正确的。它可能只是一个字符串，但我认为如果模板将其转换为 int ，那应该不重要，对吧？

# in urls.py
# (r'^projects/(?P<projectId>[0-9]+)/proposal', proposal_editor),
# projectId sent down in RequestContext as 'projectId'

# in template
# {% proposal_html projectId %}

# in templatetag file
from django import template

register = template.Library()

@register.tag(name="proposal_html")
def do_proposal_html(parser, token):
    try:
        # split_contents() knows not to split quoted strings.
    tagName, projectId = token.split_contents()
    except ValueError:
        raise template.TemplateSyntaxError, "%r tag requires a single argument" % token.contents.split()[0]
    print(projectId)
    projectId = int(projectId)

    return ProposalHtmlNode(int(projectId))

class ProposalHtmlNode(template.Node):
    def __init__(self, projectId):
    self.projectId = projectId

原文

I'm trying to pass a variable from the URL (not the query string) to a custom tag, but it looks like I'm getting a ValueError when converting it to an int. It appears at first glance that it's coming in as a string like "project.id" instead of the actual integer value of that. From what I understand, the tag parameters are always strings. If I print out the value of the parameter in my view before sending it down, it appears correct. It might just be a string, but I figured that shouldn't matter if the template is going to convert it to an int anyway, right?

# in urls.py
# (r'^projects/(?P<projectId>[0-9]+)/proposal', proposal_editor),
# projectId sent down in RequestContext as 'projectId'

# in template
# {% proposal_html projectId %}

# in templatetag file
from django import template

register = template.Library()

@register.tag(name="proposal_html")
def do_proposal_html(parser, token):
    try:
        # split_contents() knows not to split quoted strings.
    tagName, projectId = token.split_contents()
    except ValueError:
        raise template.TemplateSyntaxError, "%r tag requires a single argument" % token.contents.split()[0]
    print(projectId)
    projectId = int(projectId)

    return ProposalHtmlNode(int(projectId))

class ProposalHtmlNode(template.Node):
    def __init__(self, projectId):
    self.projectId = projectId

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檐上三寸雪 2024-10-26 20:09:35

问题很简单，您尚未将变量解析为其包含的值。如果您在方法中添加一些日志记录，您将看到此时 projectId 实际上是字符串 "projectId"，因为这就是您在模板中引用它的方式。您需要将其定义为 template.Variable 的实例，然后在 Node 的 render 方法中解析它。请参阅有关的文档解析变量。

但是，根据您在渲染中实际执行的操作，您可能会发现完全摆脱 Node 类并仅使用 simple_tag 装饰器，它也不需要单独的 Node 还获取已解析的变量作为其参数。