fix: add unique constraint in task_logs for expense_group (#666)

apps/tasks/migrations/0012_alter_tasklog_expense_group.py

@@ -0,0 +1,20 @@
+# Generated by Django 3.2.14 on 2024-11-14 10:35
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('fyle', '0033_expense_paid_on_fyle'),
+        ('tasks', '0011_error_repetition_count'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='tasklog',
+            name='expense_group',
+            field=models.ForeignKey(help_text='Reference to Expense group', null=True, on_delete=django.db.models.deletion.PROTECT, to='fyle.expensegroup', unique=True),
+        ),
+    ]

apps/tasks/models.py

@@ -43,7 +43,7 @@ class TaskLog(models.Model):
     type = models.CharField(max_length=50, choices=TASK_TYPE, help_text='Task type (FETCH_EXPENSES / CREATE_BILL)')
     task_id = models.CharField(max_length=255, null=True, help_text='Django Q task reference')
     expense_group = models.ForeignKey(ExpenseGroup, on_delete=models.PROTECT,
-        null=True, help_text='Reference to Expense group')
+        null=True, help_text='Reference to Expense group', unique=True)
     bill = models.ForeignKey(Bill, on_delete=models.PROTECT, help_text='Reference to Bill', null=True)
     expense_report = models.ForeignKey(ExpenseReport, on_delete=models.PROTECT, help_text='Reference to Expense Report',
         null=True)