Public release

testing/__init__.py

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+# -*- coding: utf-8 -*-
+default_app_config = 'testing.apps.TestingConfig'

testing/admin.py

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+# -*- coding: utf-8 -*-
+from urllib.parse import urlencode
+
+from django.contrib import admin
+from django.urls import reverse
+from django.utils.safestring import mark_safe
+from django_changelist_inline import (
+    ChangelistInline,
+    ChangelistInlineAdmin,
+    ChangelistInlineModelAdmin,
+)
+
+from testing.models import RelatedThing, Thing
+
+
+@admin.register(RelatedThing)
+class RelatedThingModelAdmin(admin.ModelAdmin):
+    list_display = ('pk', 'name')
+
+
+class RelatedThingChangelistInline(ChangelistInline):
+    model = RelatedThing
+
+    class ChangelistModelAdmin(ChangelistInlineModelAdmin):
+        list_display = ('name', 'format_actions')
+        list_display_links = None
+        list_per_page = 5
+
+        def get_queryset(self, request):
+            return RelatedThing.objects.filter(thing=self.parent_instance)
+
+        @mark_safe
+        def format_actions(self, obj=None):
+            if obj is None:
+                return self.empty_value_display
+
+            change_link_url = reverse(
+                'admin:{app_label}_{model_name}_change'.format(
+                    app_label=RelatedThing._meta.app_label,
+                    model_name=RelatedThing._meta.model_name,
+                ),
+                args=[obj.pk],
+            )
+
+            return (
+                f'<a class="button" href="{change_link_url}">'
+                    'Edit'  # noqa: E131
+                '</a>'
+            )
+        format_actions.short_description = 'Actions'
+
+        @property
+        def title(self):
+            return 'Linked Related Things'
+
+        @property
+        def no_results_message(self):
+            return 'No Related Things?'
+
+        def get_add_url(self, request):
+            result = super().get_add_url(request)
+            if result is not None:
+                return result + '?' + urlencode({
+                    'thing': self.parent_instance.pk,
+                })
+
+            return result
+
+        def get_show_all_url(self, request):
+            result = super().get_show_all_url(request)
+            if result is not None:
+                return result + '?' + urlencode({
+                    'thing': self.parent_instance.pk,
+                })
+
+            return result
+
+        def get_toolbar_links(self, request):
+            return (
+                '<a href="https://www.bthlabs.pl/">'
+                    'BTHLabs'  # noqa: E131
+                '</a>'
+            )
+
+
+@admin.register(Thing)
+class ThingModelAdmin(ChangelistInlineAdmin):
+    inlines = (RelatedThingChangelistInline,)

testing/apps.py

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+# -*- coding: utf-8 -*-
+from django.apps import AppConfig
+
+
+class TestingConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'testing'

testing/factories.py

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+# -*- coding: utf-8 -*-
+from django.contrib.auth.models import User
+import factory
+
+from testing.models import RelatedThing, Thing
+
+
+class UserFactory(factory.Factory):
+    class Meta:
+        model = User
+
+    email = factory.Faker('ascii_email')
+    username = factory.Faker('ascii_email')
+    password = factory.Faker('password')
+    is_staff = False
+
+
+class ThingFactory(factory.Factory):
+    class Meta:
+        model = Thing
+
+    name = factory.Faker('words', nb=1)
+    data = factory.LazyAttribute(lambda thing: {'thing': True})
+
+
+class RelatedThingFactory(factory.Factory):
+    class Meta:
+        model = RelatedThing
+
+    name = factory.Faker('words', nb=1)
+    data = factory.LazyAttribute(lambda thing: {'related_thing': True})

testing/migrations/0001_initial.py

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+# Generated by Django 3.2.5 on 2021-07-29 06:06
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Thing',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255)),
+                ('data', models.JSONField(blank=True, default=None, null=True)),
+            ],
+        ),
+    ]

testing/migrations/0002_relatedthing.py

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+# Generated by Django 3.2.5 on 2021-07-29 06:07
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('testing', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='RelatedThing',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255)),
+                ('data', models.JSONField(blank=True, default=None, null=True)),
+                ('thing', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='testing.thing')),
+            ],
+        ),
+    ]

testing/models.py

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+# -*- coding: utf-8 -*-
+from django.db import models
+
+
+class Thing(models.Model):
+    name = models.CharField(max_length=255, null=False, blank=False)
+    data = models.JSONField(null=True, default=None, blank=True)
+
+
+class RelatedThing(models.Model):
+    thing = models.ForeignKey(Thing, null=False, on_delete=models.CASCADE)
+    name = models.CharField(max_length=255, null=False, blank=False)
+    data = models.JSONField(null=True, default=None, blank=True)

testing/urls.py

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+# -*- coding: utf-8 -*-
+from django.contrib import admin
+from django.urls import path
+
+urlpatterns = [
+    path('admin/', admin.site.urls),
+]