On Aug 26, 12:44 am, MIL <needb...@gmail.com> wrote:
> Hi guys :o)
>
> Im attempting to create a template tag but I get a strange response.
> it returns "None" where I put the {% if blog_detail %} tag
>
> Here is my template tag
>
> class BlogNode(Node):
> def __init__(self, user, varname):
> self.user, self.varname = user, varname
>
> def render(self, context):
> try:
> context[self.varname] =
> Blog.objects.get(user=self.user)
> except ObjectDoesNotExist:
> context[self.varname] = False
>
> @register.tag
> def get_blog(parser, token):
> # {% get_blog for user_object as object_detail %}
> # {% if blog_detail %} etc...
> bits = token.contents.split()
> if len(bits) != 5:
> raise TemplateSyntaxError, "get_blog tag takes exactly five
> arguments"
> if bits[1] != 'for':
> raise TemplateSyntaxError, "second argument to get_blog tag
> must be
> 'for'"
> if bits[3] != 'as':
> raise TemplateSyntaxError, "third argument to get_blog tag
> must be
> 'as'"
> return BlogNode(bits[2], bits[4])
>
> Why does it response with a "None" message?
>
> Thanks :o)
Your render() method should return something, even if it's a blank
string. The default value returned by a function in Python is None, so
the template is simply showing this (converted into a string, ie
'None').
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