Make max_length of the name field in PeriodicTask model configurable

Author: milind-shakya-sp

django_celery_beat/migrations/0001_initial.py

@@ -4,6 +4,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+from django.conf import settings
 
 
 class Migration(migrations.Migration):
@@ -71,8 +72,15 @@ class Migration(migrations.Migration):
                     auto_created=True, primary_key=True,
                     serialize=False, verbose_name='ID')),
                 ('name', models.CharField(
-                    help_text='Useful description', max_length=191,
-                    unique=True, verbose_name='name')),
+                    help_text='Useful description',
+                    max_length=getattr(
+                        settings,
+                        'DJANGO_CELERY_BEAT_NAME_MAX_LENGTH',
+                        200
+                    ),
+                    unique=True,
+                    verbose_name='name'
+                )),
                 ('task', models.CharField(
                     max_length=200, verbose_name='task name')),
                 ('args', models.TextField(

django_celery_beat/models.py

@@ -6,6 +6,7 @@
 import timezone_field
 from celery import schedules
 from celery.five import python_2_unicode_compatible
+from django.conf import settings
 from django.core.exceptions import MultipleObjectsReturned, ValidationError
 from django.core.validators import MaxValueValidator
 from django.db import models
@@ -248,8 +249,14 @@ class PeriodicTask(models.Model):
     """Model representing a periodic task."""
 
     name = models.CharField(
-        _('name'), max_length=191, unique=True,
-        help_text=_('Useful description'),
+        _('name'),
+        max_length=getattr(
+            settings,
+            'DJANGO_CELERY_BEAT_NAME_MAX_LENGTH',
+            200
+        ),
+        unique=True,
+        help_text=_('Useful description')
     )
     task = models.CharField(_('task name'), max_length=200)
     interval = models.ForeignKey(