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feat: add template option to display decorator #1567

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feat: add template option to display decorator #1567

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ohrstrom
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Adds a template option to @display decorator.

The template option expects a Django template, which is rendered with the provided context.

class DemoAdmin(ModelAdmin):
    list_display = [
        "display_template",
    ]

    @display(
        description="Template",
        template="demo/admin/demo_template.html",
    )
    def display_template(self, obj):
        return {
            "name": obj.name,
            "count": obj.related.count(),
        }
<!-- demo/admin/demo_template.html -->
{{ name }} <sup>{{ count }}</sup>

This makes it easier to render arbitrary templates directly through the decorator, without needing to call render_to_string in the admin classes.

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@ohrstrom