How to Properly Reference Template Variables in Jinja `url_for()` Expressions?

Referencing Template Variables in Jinja Expressions: A Solution

This article addresses a common issue faced when trying to embed template variables within Jinja expressions for URL generation using url_for().

The Problem:

Jinja2 templates allow for the use of expressions enclosed in double curly braces ({{ ... }}). However, when attempting to include a template variable within the url_for() function, users may encounter syntax errors if they nested additional curly braces:

The Solution:

The key to resolving this issue is to remove the unnecessary nested curly braces. Jinja expressions are already considered Python-like, so there is no need for further brackets enclosing the template variable.

In this adjusted code, filename=name assigns the value of the name template variable to the filename parameter of the moremagic route.

Additional Note:

It's crucial to note that url_for() requires an endpoint name, not the URL path itself. In the example provided, the endpoint name is moremagic, which defaults to the function name if not explicitly defined.

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