On Fri, Aug 28, 2009 at 10:34 PM, MIL <needb...@gmail.com> wrote:
>
> Hi :o)
>
> I am attempting to create a simpler way to create my links. and I
> developed this template tag:
>
>
> class LinkNode(Node):
> def __init__(self, object):
> self.object = object
>
> def render(self, context):
> model_name = self.object.get_model_name()
> linktext = self.object.get_linktext()
> url = self.object.get_absolute_url()
> if model_name and linktext and url:
> return '<a href="%s" class="%s">%s</a>' % (url,
> model_name.lower(),
> linktext)
> return ''
>
> @register.tag
> def create_a_link(parser, token):
> # {% create_a_link to object %}
> bits = token.contents.split()
> if len(bits) != 3:
> raise TemplateSyntaxError, "create_a_link tag takes exactly
> three
> arguments"
> if bits[1] != 'to':
> raise TemplateSyntaxError, "second argument to create_a_link
> tag
> must be 'to'"
> return LinkNode(bits[2],)
>
>
> But I get this error message:
> TemplateSyntaxError at /
> Caught an exception while rendering: 'unicode' object has no attribute
> 'get_model_name'
>
> What am I doing wrong????
>
You did not do the work required to access a template variable passed to
your tag. Your tag gets a string, the name of the variable in the context,
not the variable itself. This is covered in the doc here:
http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#passing-template-variables-to-the-tag
>
> Is there a simpler and better way to do this job?
>
Yes, see:
http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#shortcut-for-simple-tags
>From a brief glance it looks to me like what you are writing could easily be
just a simple tag, which is much easier to write and frees you from having
to resolve the variables (the step you have missed) and also check the
required number of arguments, etc.
>
> I would also like to develop something that can make it simpler to
> create tables and lists, but that later on.
>
Do read through to the end of that page on custom template tags. Inclusion
tags may be useful for you here.
Karen
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