Merge pull request projectcaluma#153 from sliverc/single_document_per…

…_case

Let a document only be assigned to one case

caluma/form/schema.py

@@ -346,7 +346,6 @@ class Document(DjangoObjectType):
     class Meta:
         model = models.Document
         interfaces = (graphene.Node,)
-        exclude_fields = ("cases",)
         filter_fields = ("form",)
 
 

caluma/tests/snapshots/snap_test_schema.py

@@ -198,6 +198,7 @@
   form: Form!
   meta: JSONString!
   answers(before: String, after: String, first: Int, last: Int, question: ID, search: String, orderBy: [AnswerOrdering]): AnswerConnection
+  case: Case
 }
 
 type DocumentConnection {

caluma/workflow/migrations/0002_auto_20181213_1334.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.17 on 2018-12-13 13:34
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [("workflow", "0001_initial")]
+
+    operations = [
+        migrations.AlterField(
+            model_name="case",
+            name="document",
+            field=models.OneToOneField(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.PROTECT,
+                related_name="case",
+                to="form.Document",
+            ),
+        )
+    ]

caluma/workflow/models.py

@@ -66,10 +66,10 @@ class Case(UUIDModel):
     )
     status = models.CharField(choices=STATUS_CHOICE_TUPLE, max_length=50, db_index=True)
     meta = JSONField(default={})
-    document = models.ForeignKey(
+    document = models.OneToOneField(
         "form.Document",
-        on_delete=models.DO_NOTHING,
-        related_name="cases",
+        on_delete=models.PROTECT,
+        related_name="case",
         blank=True,
         null=True,
     )