How to Loop Through Objects in HTML with Django {% for %} Tag

Learn how to properly use Django's `{% for %}` tag to loop through objects in your HTML templates, including tips for troubleshooting common issues.
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This video is based on the question https://stackoverflow.com/q/70466831/ asked by the user 'Aleksa' ( https://stackoverflow.com/u/16770194/ ) and on the answer https://stackoverflow.com/a/70467414/ provided by the user 'Sabil' ( https://stackoverflow.com/u/16555279/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Loop Through Objects in HTML with Django {% for %} Tag

When working with Django web applications, you might find yourself needing to display a list of objects—like categories—in your HTML templates. This task can frequently be accomplished using the {% for %} tag in Django's templating engine. However, it's not uncommon to run into some hiccups along the way. In this guide, we will explore a typical problem related to looping through objects in HTML and how to solve it step-by-step.

The Problem: Incorrect Implementation of {% for %}

Imagine that you are trying to create a simple filter box that displays all of your categories but run into an issue when trying to loop through them. Here's a simplified version of the problematic code:

[[See Video to Reveal this Text or Code Snippet]]

Key Takeaway

If you encounter problems with your {% for %} loop, it's often a result of a misnamed variable or an error in your context dictionary. In this case, the loop is trying to iterate through categorys, which does not match the variable defined in your views.

The Solution: Correcting the Code

To effectively loop through your categories, you'll need to ensure that you're referencing the correct variable both in your view and in your HTML template.

Step 1: Update Your Django View

First, make sure your view correctly retrieves categories. Here’s the adjusted view code:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Modify Your HTML Template

With the corrected view, the next thing to do is modify your HTML template. You should refer to the correct variable name as follows:

[[See Video to Reveal this Text or Code Snippet]]

Key Adjustments

Variable Naming: Ensure that the name you use in the {% for %} tag matches the name defined in the context dictionary provided by your view. In this case, use categories instead of categorys.

Dynamic Content: Instead of using static text like "Hello", consider displaying dynamic content from your Category object, such as {{ category.name }} for better usability and clarity.

Conclusion

Looping through objects in Django's templates using the {% for %} tag is straightforward, but it requires attention to detail regarding variable names and context. Always ensure that the variable in your template corresponds to what you've defined in your views. With these adjustments, your filter box will successfully display the desired categories dynamically.

Now you're all set to implement a functional category filter in your Django project. Happy coding!

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