Merge pull request #24 from buildingSMART/feature/IVS-208_ModelInstan…

…ce_unique_constraint

IVS-208 - Enforce unique constraint

migrations/0002_modelinstance_modelid_stepfileid_ifctype.py

@@ -0,0 +1,17 @@
+# Generated by Django 5.1.3 on 2024-11-11 22:39
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ifc_validation_models', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name='modelinstance',
+            constraint=models.UniqueConstraint(fields=('model_id', 'stepfile_id', 'ifc_type'), name='modelid_stepfileid_ifctype'),
+        ),
+    ]

models.py

@@ -604,6 +604,10 @@ class Meta:
         verbose_name = "Model Instance"
         verbose_name_plural = "Model Instances"
 
+        constraints = [
+            models.UniqueConstraint(fields=['model_id', 'stepfile_id', 'ifc_type'], name='modelid_stepfileid_ifctype')
+        ]
+
     def __str__(self):
 
         return f'#{self.id} - {self.ifc_type} - {self.model.file_name}'