Create base model with created_at and is_deleted fields.

orchestra/migrations/0037_add_fields_to_iteration.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.5 on 2016-04-14 21:18
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orchestra', '0036_remove_taskassignment_snapshots'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='iteration',
+            name='created_at',
+            field=models.DateTimeField(default=django.utils.timezone.now),
+        ),
+        migrations.AddField(
+            model_name='iteration',
+            name='is_deleted',
+            field=models.BooleanField(default=False),
+        ),
+    ]

orchestra/models.py

@@ -5,6 +5,7 @@
 from jsonfield import JSONField
 
 from orchestra.core.errors import ModelSaveError
+from orchestra.utils.models import BaseModel
 
 # TODO(marcua): Convert ManyToManyFields to django-hstore referencefields or
 # wait for django-postgres ArrayFields in Django 1.8.
@@ -443,7 +444,7 @@ def __str__(self):
             str(self.task), self.assignment_counter, str(self.worker))
 
 
-class Iteration(models.Model):
+class Iteration(BaseModel):
     """
     Iterations are the contiguous units of a worker's time on task.
 

orchestra/utils/models.py

@@ -0,0 +1,26 @@
+from django.db import models
+from django.utils import timezone
+
+
+class DeleteMixin(object):
+
+    def delete(self, *args, **kwargs):
+        self.is_deleted = True
+        self.save()
+
+
+class BaseModel(DeleteMixin, models.Model):
+    """
+    Abstract base class models which defines created_at and is_deleted fields.
+
+    Attributes:
+        created_at (datetime.datetime):
+            Datetime at which the model is created.
+        is_deleted (boolean):
+            If value is True, TimeEntry is deleted. Default is False.
+    """
+    created_at = models.DateTimeField(default=timezone.now)
+    is_deleted = models.BooleanField(default=False)
+
+    class Meta:
+        abstract = True