Fix #2323 (#2324)

sapl/materia/migrations/0032_auto_20181022_1743.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.13 on 2018-10-22 20:43
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('materia', '0031_auto_20180924_1724'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='autoria',
+            name='autor',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to='base.Autor', verbose_name='Autor'),
+        ),
+    ]

sapl/materia/models.py

@@ -307,7 +307,7 @@ class MateriaLegislativa(models.Model):
 class Autoria(models.Model):
     autor = models.ForeignKey(Autor,
                               verbose_name=_('Autor'),
-                              on_delete=models.CASCADE)
+                              on_delete=models.PROTECT)
     materia = models.ForeignKey(
         MateriaLegislativa, on_delete=models.CASCADE,
         verbose_name=_('Matéria Legislativa'))