Fixed #31181 -- Added links to related models for admin's readonly fields.

1 files changed, 21 insertions, 2 deletions

diff --git a/django/contrib/admin/helpers.py b/django/contrib/admin/helpers.py
index 56d7970d2a..6f0be6b148 100644
--- a/django/contrib/admin/helpers.py
+++ b/django/contrib/admin/helpers.py
@@ -3,12 +3,15 @@ import json
 from django import forms
 from django.contrib.admin.utils import (
     display_for_field, flatten_fieldsets, help_text_for_field, label_for_field,
-    lookup_field,
+    lookup_field, quote,
 )
 from django.core.exceptions import ObjectDoesNotExist
-from django.db.models import ManyToManyRel
+from django.db.models.fields.related import (
+    ForeignObjectRel, ManyToManyRel, OneToOneField,
+)
 from django.forms.utils import flatatt
 from django.template.defaultfilters import capfirst, linebreaksbr
+from django.urls import NoReverseMatch, reverse
 from django.utils.html import conditional_escape, format_html
 from django.utils.safestring import mark_safe
 from django.utils.translation import gettext, gettext_lazy as _
@@ -187,6 +190,17 @@ class AdminReadonlyField:
         label = self.field['label']
         return format_html('<label{}>{}{}</label>', flatatt(attrs), capfirst(label), self.form.label_suffix)
 
+    def get_admin_url(self, remote_field, remote_obj):
+        url_name = 'admin:%s_%s_change' % (
+            remote_field.model._meta.app_label,
+            remote_field.model._meta.model_name,
+        )
+        try:
+            url = reverse(url_name, args=[quote(remote_obj.pk)])
+            return format_html('<a href="{}">{}</a>', url, remote_obj)
+        except NoReverseMatch:
+            return str(remote_obj)
+
     def contents(self):
         from django.contrib.admin.templatetags.admin_list import _boolean_icon
         field, obj, model_admin = self.field['field'], self.form.instance, self.model_admin
@@ -212,6 +226,11 @@ class AdminReadonlyField:
             else:
                 if isinstance(f.remote_field, ManyToManyRel) and value is not None:
                     result_repr = ", ".join(map(str, value.all()))
+                elif (
+                    isinstance(f.remote_field, (ForeignObjectRel, OneToOneField)) and
+                    value is not None
+                ):
+                    result_repr = self.get_admin_url(f.remote_field, value)
                 else:
                     result_repr = display_for_field(value, f, self.empty_value_display)
                 result_repr = linebreaksbr(result_repr)