Added Django 2.0 compatibility regarding required on_delete-parameter on ForeignKeys

Author: metteludwig

forms_builder/forms/migrations/0001_initial.py

@@ -83,7 +83,7 @@ class Migration(migrations.Migration):
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('entry_time', models.DateTimeField(verbose_name='Date/time')),
-                ('form', models.ForeignKey(related_name='entries', to='forms.Form')),
+                ('form', models.ForeignKey(related_name='entries', to='forms.Form', on_delete=models.CASCADE)),
             ],
             options={
                 'abstract': False,
@@ -95,13 +95,13 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='fieldentry',
             name='entry',
-            field=models.ForeignKey(related_name='fields', to='forms.FormEntry'),
+            field=models.ForeignKey(related_name='fields', to='forms.FormEntry', on_delete=models.CASCADE),
             preserve_default=True,
         ),
         migrations.AddField(
             model_name='field',
             name='form',
-            field=models.ForeignKey(related_name='fields', to='forms.Form'),
+            field=models.ForeignKey(related_name='fields', to='forms.Form', on_delete=models.CASCADE),
             preserve_default=True,
         ),
     ]

forms_builder/forms/models.py

@@ -261,11 +261,11 @@ class Meta:
 ###################################################
 
 class FormEntry(AbstractFormEntry):
-    form = models.ForeignKey("Form", related_name="entries")
+    form = models.ForeignKey("Form", related_name="entries", on_delete=models.CASCADE)
 
 
 class FieldEntry(AbstractFieldEntry):
-    entry = models.ForeignKey("FormEntry", related_name="fields")
+    entry = models.ForeignKey("FormEntry", related_name="fields", on_delete=models.CASCADE)
 
 
 class Form(AbstractForm):
@@ -277,7 +277,7 @@ class Field(AbstractField):
     Implements automated field ordering.
     """
 
-    form = models.ForeignKey("Form", related_name="fields")
+    form = models.ForeignKey("Form", related_name="fields", on_delete=models.CASCADE)
     order = models.IntegerField(_("Order"), null=True, blank=True)
 
     class Meta(AbstractField.Meta):