Filtering of objects which have one to many relation with another in template

Using Django
1

Hello! My problem is next:

I have 3 classes:

Rubric, Report, ScienceEvent

And next relations:

One rubric - many reports
One event - many reports

Some words about Rubric:
Rubric has Charfield “name” with 3 possible values “chm”, “blg”, “plg” (chemistry, biology and etc.)
So, I have only 3 rubrics.

I want to pass event object in context for template
and then iterate reports of this event which relate to some rubric (for example “chm”)

So, I want something like that

{% for r in event.reports.which_rubric 'chm" %}

{% endfor %}

I can do this by writing 3 methods for ReportManager but it is bad style, I suppose
Or I can parse data in view and make list of reports which relate to this event and have rubruc “chm” but this is bad solution too for me

Or I can write custom filter like

{% for r in event.reports | which_rubric: 'chm" %}

{% endfor %}

What is the best solution?

2

Your best solution is to build your data structures in the view, and reserve use of the template for displaying the data. Templates aren’t designed to filter data - it should be filtered when preparing the context for that template.