Ticket #19888: 0001-PoC-for-19888-fix.patch

django/contrib/admin/helpers.py

@@ -289 +289 @@
     def pk_field(self):
         return AdminField(self.form, self.formset._pk_field.name, False)
 
+    def pk_field_name(self):
+        return self.formset._pk_field.name
+
     def fk_field(self):
         fk = getattr(self.formset, "fk", None)
         if fk:

django/contrib/admin/templates/admin/edit_inline/tabular.html

@@ -47 +47 @@
               <td{% if field.field.name %} class="field-{{ field.field.name }}"{% endif %}>
               {% if field.is_readonly %}
                   <p>{{ field.contents|linebreaksbr }}</p>
+                  {% if inline_admin_form.pk_field_name == field.field.name %}
+                    <input type="hidden"
+                           value="{{ field.contents }}"
+                           id="id_{{ inline_admin_form.formset.prefix }}-{{ forloop.parentloop.parentloop.parentloop.counter0 }}-{{ field.field.name }}"
+                           name="{{ inline_admin_form.formset.prefix }}-{{ forloop.parentloop.parentloop.parentloop.counter0 }}-{{ field.field.name }}"
+                           readonly />
+                  {% endif %}
               {% else %}
                   {{ field.field.errors.as_ul }}
                   {{ field.field }}