Django 3 Web Development Cookbook - Fourth Edition

How it works...

Advanced custom template tags consist of two things:

• A function that parses the arguments of the template tag
• The Node class that is responsible for the logic of the template tag as well as the output

The {% try_to_include %} template tag expects one argument— that is, template_name. Therefore, in the try_to_include() function, we try to assign the split contents of the token only to the tag_name variable (which is try_to_include) and the template_name variable. If this doesn't work, a TemplateSyntaxError is raised. The function returns the IncludeNode object, which gets the template_name field and stores it in a template Variable object for later use.

In the render() method of IncludeNode, we resolve the template_name