Tutorial :How do I access unrelated models within a Django template?



Question:

I want to use an app to create a menu that is easy to edit with the admin interface. Something like this:

class Menu_item          name = models.CharField()          item_url = models.URLField()  

My template looks something like this:

{% extends base.html %}

div ID="nav"

   {{ foo.navbar.? }}  

/div

div ID="Content"

   {% block content %}{% endblock %}  

/div

I want div#nav to contain a ul based upon the above model but just can't figure out how to accomplish this. It seems like an object_list generic view would be great but, the URL accesses the view for the model that populates div#content. Does anyone have any suggestions? Is there a way to access a generic view without a URL?

Thank you.


Solution:1

First, in you view, get data from db:

def index(request):      navbar = Menu_item.objects.all()      return render_to_response( 'you_template.html',           { 'navbar': navbar }, context_instance = RequestContext (request ) )  

And in template:

<div id="nav">      <ul>      {% for i in navbar %}          <li><a href="{{ i.item_url }}">{{ i.name }}</a></li>      {% endfor  %}      </ul>  </div>  


Solution:2

I have discovered a solution. Inclusion Tags.

What I did was create an inclusion tag, which amounts to a simple custom template tag (django provides a shortcut for you!).

Here is what I did:

  • Ignore views.py - It will not be used in this case
  • Create a sub-directory in the app's dir called "templatetags" containing init.py and get_navbar.py (or whatever you want your tag to be):

    mysite/     navbar/          templatetags/              __ init__.py (without the space befire init)              get_navbar.py  
  • I changed my navbar.models to look like this:
    from django.db import models      class Menu_choice(models.Model):          name = models.CharField(max_length=30)            def __unicode__(self):                  return self.name    class Menu_item(models.Model):          name = models.CharField(max_length=20)          navbar = models.ForeignKey(Menu_choice)          item_url = models.CharField(max_length=200)          item_desc = models.CharField(max_length=30)            def __unicode__(self):                  return self.name  

    This allows me to create a Menu_choice object in the admin interface for each layer of navigation (primary, secondary, etc)

  • get_navbar.py looks like this:
    from navbar.models import Menu_choice, Menu_item  from django import template    register = template.Library()    @register.inclusion_tag('navbar/navbar.html')  def get_navbar(navBar):          navbar = Menu_item.objects.filter(navbar__name=navBar)          return { "navbar": navbar }  

    (Note navBar as opposed to navbar)

  • Create the navbar.html template:
        <ul>
    {% for menu_item in navbar %} <li><a href="{{ menu_item.item_url }}">{{ menu_item.name }}&lt/a>&lt/li> {% endfor %} </ul>
  • Finally, I inserted the following into my base.html:
    {% load get_navbar %}

    And where I want primary navigation:

    {% get_navbar "primary" %}

    Note: the quotes around the string you are sending to your inclusion tag are important. I spent a ridiculously lengthy bit of time trying to make it work before I figured that out.

    Also a big thank you to dikamilo for the help.


  • Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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