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PO'NoneType' object has no attribute 'source' error while rendering custom template tag
 

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  1. PO'NoneType' object has no attribute 'source' error while rendering custom template tag
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    <p>Edit:I debugged the traceback after lot of time. Look at the end of the question for the answer.</p> <p>I wrote a custom template tag that checks if a particular group on a site is bookmarked by a user and adds specific content to html based on that. </p> <p>The tempplate tag I wrote is as follows.</p> <pre><code>def do_if_bookmarked(parser, token): bits = token.contents.split() if len(bits) != 3: raise template.TemplateSyntaxError("%s tag takes two arguments" % bits[0]) nodelist_true = parser.parse(('else', 'endif_bookmarked')) token = parser.next_token() if token.contents == 'else': nodelist_false = parser.parse(('endif_bookmarked',)) parser.delete_first_token() else: nodelist_false = template.NodeList() return IfBookmarkedNode(bits[1], bits[2], nodelist_true, nodelist_false) class IfBookmarkedNode(template.Node): def __init__(self, user, pageuri, nodelist_true, nodelist_false): self.nodelist_true = nodelist_true self.nodelist_false = nodelist_false self.user = template.Variable(user) self.pageuri = template.Variable(pageuri) def render(self, context): try: user = self.user.resolve(context) pageuri = self.pageuri.resolve(context) except template.VariableDoesNotExist: return ' ' if BookmarkTag.objects.filter(user__pk=user.id, pageuri=pageuri): return self.nodelist_true.render(context) else: return self.nodelist_false.render(context) register = template.Library() register.tag('if_bookmarked', do_if_bookmarked) </code></pre> <p>and the html part is </p> <pre><code>{% if user.is_authenticated %} {% if_bookmarked user pageuri %} &lt;p&gt;you bookmared this&lt;/p&gt; {% else %} &lt;form method="post" {{bookmarkformaction}} &gt; details:&lt;textarea rows="2" cols="20"name='bookmarkdetails'&gt; &lt;/textarea&gt; name:&lt;input type="text" id="id_bookmarkname" name='bookmarkname' value="" /&gt; &lt;input type="submit" name="add-bookmark" value="Add Bookmark" /&gt; &lt;/form&gt; {% endif_bookmarked %} {% else %} &lt;a href="/accounts/login/"&gt;login&lt;/a&gt; &lt;a href="/accounts/register/"&gt;register&lt;/a&gt; {% endif %} </code></pre> <p>I understand that node object is 'None' from the traceback but I am puzzled as to how to solve this. What is it I am overlooking?</p> <p>Please let me know if the info is inadequeate or if question is not clear. I will amend it as required.</p> <p>traceback:</p> <pre><code> Environment: Request Method: GET Request URL: http://localhost:8000/posttags/page/-EE-Btech/ Django Version: 1.3.1 Python Version: 2.7.2 Installed Applications: ['registration_defaults', 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.messages', 'django.contrib.staticfiles', 'registration', 'debug_toolbar', 'postpots'] Installed Middleware: ('debug_toolbar.middleware.DebugToolbarMiddleware', 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware') Traceback: File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 111. response = callback(request, *callback_args, **callback_kwargs) File "/home/Qalqi/Projects/Python/Django/djangopath/postpots/views.py" in page 42. context_instance=RequestContext(request)) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django /shortcuts/__init__.py" in render_to_response 20. return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/loader.py" in render_to_string 181. t = get_template(template_name) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/loader.py" in get_template 157. template, origin = find_template(template_name) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/loader.py" in find_template 134. source, display_name = loader(name, dirs) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/loader.py" in __call__ 42. return self.load_template(template_name, template_dirs) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/loader.py" in load_template 48. template = get_template_from_string(source, origin, template_name) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/loader.py" in get_template_from_string 168. return Template(source, origin, name) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/debug_toolbar/panels/template.py" in new_template_init 37. old_template_init(self, template_string, origin, name) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/base.py" in __init__ 108. self.nodelist = compile_string(template_string, origin) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/base.py" in compile_string 136. return parser.parse() File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/base.py" in parse 239. compiled_result = compile_func(self, token) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/defaulttags.py" in do_if 922. nodelist_true = parser.parse(('else', 'endif')) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/base.py" in parse 243. self.extend_nodelist(nodelist, compiled_result, token) File "/home/Qalqi/.virtualenvs/sandmaze/local/lib/python2.7/site-packages/django/template/debug.py" in extend_nodelist 58. node.source = token.source Exception Type: AttributeError at /posttags/page/-EE-Btech/ Exception Value: 'NoneType' object has no attribute 'source' </code></pre> <p>EDit: This problem occcured because the do_if_bookmarked method was not returning any object in some cases. Make sure you have some object that is beign returned.</p>
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    1. USKamal Reddy
    1. USKamal Reddy
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      1. PO'NoneType' object has no attribute 'source' error while rendering custom template tag
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    1. COPlease show the **entire** error and traceback.
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      1. PO'NoneType' object has no attribute 'source' error while rendering custom template tag
      1. USMarcin
    2. COadded the traceback to the question
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      1. PO'NoneType' object has no attribute 'source' error while rendering custom template tag
      1. USKamal Reddy
    3. COGreat. I still can't help you, but probably someone else can. May I suggest installing `django-extensions`, which adds support for the werkzeug debugger, which allows you to examine every stack frame right in the browser. It's helped me locate many an error.
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      1. PO'NoneType' object has no attribute 'source' error while rendering custom template tag
      1. USMarcin
 

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