I'm having my first go at a generic templatetag and am having issues
getting it to work.
I've created a directory at project/templatetags, which contains
__init__.py and general_tags.py
I've added project.templatetags to my INSTALLED_APPS in settings.py
general_tags.py looks like this (it's just a modification of the
default ifequal tag):
from django.template import Node, NodeList, resolve_variable
from django.template import TemplateSyntaxError, VariableDoesNotExist
from django.template import Library
register = Library()
class IfGreaterThanNode(Node):
def __init__(self, var1, var2, nodelist_true, nodelist_false):
self.var1, self.var2 = var1, var2
self.nodelist_true, self.nodelist_false = nodelist_true,
nodelist_false
self.negate = negate
def __repr__(self):
return "<IfGreaterThanNode>"
def render(self, context):
try:
val1 = resolve_variable(self.var1, context)
except VariableDoesNotExist:
val1 = None
try:
val2 = resolve_variable(self.var2, context)
except VariableDoesNotExist:
val2 = None
if (val1 > val2):
return self.nodelist_true.render(context)
return self.nodelist_false.render(context)
def do_ifgreaterthan(parser, token):
bits = list(token.split_contents())
if len(bits) != 3:
raise TemplateSyntaxError, "%r takes two arguments" % bits[0]
end_tag = 'end' + bits[0]
nodelist_true = parser.parse(('else', end_tag))
token = parser.next_token()
if token.contents == 'else':
nodelist_false = parser.parse((end.tag,))
parser.delete_first_token()
else:
nodelist_false = NodeList()
return IfEqualNode(bits[1], bits[2], nodelist_true,
nodelist_false)
def ifgreaterthan(parser, token):
"""
Output the contents of the block if the first argument is greater
than the second argument.
Examples:
{% ifgreaterthan person.address_set.count 0 %}
...
{% endifgreaterthan %}
{% ifgreaterthan person.address_set.count 0 %}
...
{% else %}
...
{% endifgreaterthan %}
"""
return do_ifgreaterthan(parser, token)
ifgreaterthan = register.tag(ifgreaterthan)
In my template, I have {% load general_tags %} and get the following
error:
TemplateSyntaxError at /project/admin/registration/choose_student/
'general_tags' is not a valid tag library: Could not load template
library from django.templatetags.general_tags, No module named
general_tags
Request Method: GET
Exception Type: TemplateSyntaxError
Exception Value: 'general_tags' is not a valid tag library: Could not
load template library from django.templatetags.general_tags, No module
named general_tags
Exception Location: /usr/lib/python2.3/site-packages/django/template/
defaulttags.py in load, line 770
Django obviously isn't even looking in my templatetags directory for
the general_tags module. Can anyone offer any advice?
Thanks!
Branton
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