Recent calls (view all)
\n\n{% for call in recent_calls %}\n{{ call.location }} on {{ call.created_at }}
\n{% endfor %}\n```", "html": "I figured out this pattern today for adding templated extra blocks of information to the Django admin change page for an object.
\nIt's really simply and incredibly useful. I can see myself using this a lot in the future.
\nfrom django.contrib import admin\nfrom django.template.loader import render_to_string\nfrom django.utils.safestring import mark_safe\nfrom .models import Reporter\n\n\n@admin.register(Reporter)\nclass ReporterAdmin(admin.ModelAdmin):\n # ...\n readonly_fields = (\"recent_calls\",)\n\n def recent_calls(self, instance):\n return mark_safe(\n render_to_string(\n \"admin/_reporter_recent_calls.html\",\n {\n \"reporter\": instance,\n \"recent_calls\": instance.call_reports.order_by(\"-created_at\")[:20],\n \"call_count\": instance.call_reports.count(),\n },\n )\n )That's it! recent_calls is marked as a read-only field, then implemented as a method which returns HTML. That method passes the instance to a template using render_to_string. That template looks like this:
<h2>{{ reporter }} has made {{ call_count }} call{{ call_count|pluralize }}</h2>\n\n<p><strong>Recent calls</strong> (<a href=\"/admin/core/callreport/?reported_by__exact={{ reporter.id }}\">view all</a>)</p>\n\n{% for call in recent_calls %}\n <p><a href=\"/admin/core/location/{{ call.location.id }}/change/\">{{ call.location }}</a> on {{ call.created_at }}</p>\n{% endfor %}