ForeignKey of Status back to Person renamed "poster"

Statuses can't be replies to, or reblogs of, themselves.

kepi/trilby_api/migrations/0005_auto_20200415_1658.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.0.4 on 2020-04-15 16:58
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('trilby_api', '0004_auto_20200415_1506'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='status',
+            name='account',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.DO_NOTHING, related_name='poster', to='trilby_api.Person'),
+        ),
+    ]

kepi/trilby_api/models/status.py

@@ -28,6 +28,7 @@ class Status(models.Model):
 
     account = models.ForeignKey(
             'Person',
+            related_name = 'poster',
             on_delete = models.DO_NOTHING,
             )
 
@@ -201,3 +202,13 @@ class Status(models.Model):
             current = child
 
         return result
+
+    def save(self, *args, **kwargs):
+
+        if self.reblog_of == self:
+            raise ValueError("Status can't be a reblog of itself")
+
+        if self.in_reply_to == self:
+            raise ValueError("Status can't be a reply to itself")
+
+        super().save(*args, **kwargs)