Proof of concept of db_default uuid4() #10958

arches/app/models/functions.py

@@ -0,0 +1,7 @@
+from django.db import models
+
+
+class UUID4(models.Func):
+    function = "uuid_generate_v4"
+    arity = 0
+    output_field = models.UUIDField()

arches/app/models/migrations/11045_generate_resource_ids.py

@@ -0,0 +1,24 @@
+# Generated by Django 5.1.3 on 2024-11-06 12:10
+
+import arches.app.models.functions
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("models", "11044_make_further_fields_blank"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="resourceinstance",
+            name="resourceinstanceid",
+            field=models.UUIDField(
+                blank=True,
+                db_default=arches.app.models.functions.UUID4(),
+                primary_key=True,
+                serialize=False,
+            ),
+        ),
+    ]

arches/app/models/models.py

@@ -13,6 +13,7 @@
 from arches.app.utils.module_importer import get_class_from_modulename
 from arches.app.utils.thumbnail_factory import ThumbnailGeneratorInstance
 from arches.app.models.fields.i18n import I18n_TextField, I18n_JSONField
+from arches.app.models.functions import UUID4
 from arches.app.models.querysets import ResourceInstanceQuerySet, TileQuerySet
 from arches.app.models.utils import (
     add_to_update_fields,
@@ -1205,7 +1206,9 @@ class Meta:
 
 
 class ResourceInstance(models.Model):
-    resourceinstanceid = models.UUIDField(primary_key=True, blank=True)
+    resourceinstanceid = models.UUIDField(
+        primary_key=True, blank=True, db_default=UUID4()
+    )
     graph = models.ForeignKey(GraphModel, db_column="graphid", on_delete=models.CASCADE)
     graph_publication = models.ForeignKey(
         GraphXPublishedGraph,
@@ -1248,8 +1251,6 @@ def __init__(self, *args, **kwargs):
 
         for kwarg, value in arches_model_kwargs.items():
             setattr(self, kwarg, value)
-        if not self.resourceinstanceid:
-            self.resourceinstanceid = uuid.uuid4()
 
     def __repr__(self):
         return f"<{self.graph.name}: {self.name} ({self.pk})>"