On Sat, Jun 7, 2008 at 2:40 AM, Minder <[EMAIL PROTECTED]> wrote: > > Hi, > > I am new to both Django and Python and yet I'm developing a site for > myself. I have some programming skills in REXX, Pascal and Bash and > that helps a little. > > I need to do one of the simplest things, yet I hit a roadblock. > > I lost literally a week searching every little page for solution to my > problem. It appears quite obvious on the first look but my brain is > clogged right now because I read a quick introduction to Python and > nearly whole djangobook.com trying to understand as much as i can. > This was too much. Anyway, back to the subject: > > I need to display two Panels at *every* subpage - that's why I thought > about using template tags. Each Panel would hold Categories sorted by > "position" field (and "-date_mod" as fallback). Each Category could > hold elements such as Link (with "url" and "name" fields) and Page > (semi-static, with "content", "visible" and "date_pub"). Link and Page > both have "category" field which is a ForeignKey(Category), "position" > field which should determine their position in Category (again "- > date_mod" as fallback sort) and a "date_mod" field. > > If you have better idea how to achieve this simple goal, please share > it. All I need is to write a subpage and assign it to a category, and > link to that subpage should appear in that category. And if I want to > put a link to external page in the same category it should appear > there just like that. > > I've put up a static demo of what I have in mind: > http://dominik.kozaczko.info/django/ > > I have stripped-down model here: http://pastebin.com/m3f5cf035 > Plus here is template_tags definition and the test template: > http://pastebin.com/d167aa968 > > The problem is - when I eneter all queries in shell, they behave > perfectly. But this does not work in real world. I tried debugging > with print statements - context is returned perfectly to the template. > Yet the for loop can't iterate through 'list_groups' and an error > occurs at line 53 (second pastebin), where the "for" loop begins. It > returns error "Group matching query does not exist." and the traceback > is like this: > > Traceback: > File "/usr/lib/python2.4/site-packages/django/template/debug.py" in > render_node > 71. result = node.render(context) > File "/usr/lib/python2.4/site-packages/django/template/defaulttags.py" > in render > 149. nodelist.append(node.render(context)) > File > "/home/dominik/stuff/projekty/django/test/../test/szablony/ > templatetags/szabtags.py" > in render > 87. objects = Group.objects.get(id=self.groupid) > File "/usr/lib/python2.4/site-packages/django/db/models/manager.py" in > get > 82. return self.get_query_set().get(*args, **kwargs) > File "/usr/lib/python2.4/site-packages/django/db/models/query.py" in > get > 196. raise self.model.DoesNotExist("%s matching query > does > not exist." > > Exception Type: DoesNotExist at /test/ > Exception Value: Group matching query does not exist. > > > > I have no idea what is wrong :( > > Again, if you have better idea how to achieve this simple goal, please > please please share it. > > > I use Django-SVN and Python 2.4 on Linux >
I don't have a lot of time right now, so advance apologies for a sketchy response. But maybe I can point you more in the right direction. For what you want to do, I think template tags are the right approach, but you are making the implementation harder than it needs to be. For example, the specific error you are getting has to do with not being able to do a get() on the group by id (I don't have time to track down why) in ShowGroup's render function. But -- you had the group as a template variable back in the template, there's no need to pass just the ID from it and re-query the database to get back the group -- just pass the group itself. Personally I'd take a longer look at the writing template tags documentation and see if what you want to do can't be done with the easier-to-write inclusion or simple tags, see the doc around here: http://www.djangoproject.com/documentation/templates_python/#inclusion-tags My experience with writing some template tags and reading the doc was the doc started out with all these details of writing compilers and renderers and then at the end told me about these far simpler approaches that did everything I needed -- ultimately I didn't have to write one tag that worried about compiling/rendering, I just have simple and inclusion tags. That may or may not be true for what you want to do. Also as a matter of style if you are going to have tags that just set context variables, I find it confusing to name them things like 'show_panel' and 'show_group' -- they aren't actually generating output (though your current ShowGroup's render I think incorrectly now returns the context?). See the doc here: http://www.djangoproject.com/documentation/templates_python/#setting-a-variable-in-the-context for a better approach to writing tags like this, if in the end you decide that's how to do it. Karen --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
