Web Development with Django Cookbook by 2014

Author:2014
Language: eng
Format: epub, mobi
Publisher: Packt Publishing

Getting ready

Once again, we will start with the utils app that should be installed and ready for custom template tags.

How to do it...

Template tags consist of function parsing arguments passed to the tag and a node class that renders the output of the tag or modifies the template context. Perform the following steps:

First, let's create the function parsing the template-tag arguments, as follows: #utils/templatetags/utility_tags.py # -*- coding: UTF-8 -*- from django.db import models from django import template register = template.Library() ### TAGS ### @register.tag def get_objects(parser, token): """ Gets a queryset of objects of the model specified by app and model names Usage: {% get_objects [<manager>.]<method> from <app_name>.<model_name> [limit <amount>] as <var_name> %} Example: {% get_objects latest_published from people.Person limit 3 as people %} {% get_objects site_objects.all from news.Article limit 3 as articles %} {% get_objects site_objects.all from news.Article as articles %} """ amount = None try: tag_name, manager_method, str_from, appmodel, str_limit,\ amount, str_as, var_name = token.split_contents() except ValueError: try: tag_name, manager_method, str_from, appmodel, str_as,\ var_name = token.split_contents() except ValueError: raise template.TemplateSyntaxError, \ "get_objects tag requires a following syntax: " "{% get_objects [<manager>.]<method> from "\ "<app_ name>.<model_name>"\ " [limit <amount>] as <var_name> %}" try: app_name, model_name = appmodel.split(".") except ValueError: raise template.TemplateSyntaxError, \ "get_objects tag requires application name and "\ "model name separated by a dot" model = models.get_model(app_name, model_name) return ObjectsNode(model, manager_method, amount, var_name)

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