Fixes #182 : add creation_date and last_modification_date to Petition…

… model

pytition/petition/migrations/0010_auto_20200902_1853.py

@@ -0,0 +1,41 @@
+# Generated by Django 2.2.16 on 2020-09-02 16:53
+
+from django.db import migrations, models
+from django.utils import timezone
+
+def populate_dates(apps, schema_editor):
+    Petition = apps.get_model('petition', 'Petition')
+    for petition in Petition.objects.all().iterator():
+        petition.creation_date = timezone.now()
+        petition.last_modification_date = timezone.now()
+        petition.save()
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('petition', '0009_auto_20200210_0948'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='petition',
+            name='creation_date',
+            field=models.DateTimeField(null=True, blank=True),
+        ),
+        migrations.AddField(
+            model_name='petition',
+            name='last_modification_date',
+            field=models.DateTimeField(null=True, blank=True),
+        ),
+        migrations.RunPython(populate_dates),
+        migrations.AlterField(
+            model_name='petition',
+            name='creation_date',
+            field=models.DateTimeField(blank=True),
+        ),
+        migrations.AlterField(
+            model_name='petition',
+            name='last_modification_date',
+            field=models.DateTimeField(blank=True),
+        ),
+    ]

pytition/petition/models.py

@@ -10,6 +10,7 @@
 from django.contrib.auth.hashers import get_hasher
 from django.db import transaction
 from django.urls import reverse
+from django.utils import timezone
 
 from tinymce import models as tinymce_models
 from colorfield.fields import ColorField
@@ -204,6 +205,8 @@ class Petition(models.Model):
     salt = models.TextField(blank=True)
     paper_signatures = models.IntegerField(default=0)
     paper_signatures_enabled = models.BooleanField(default=False)
+    creation_date = models.DateTimeField(blank=True)
+    last_modification_date = models.DateTimeField(blank=True)
 
     def transfer_to(self, user=None, org=None):
         if user is None and org is None:
@@ -411,6 +414,7 @@ def save(self, *args, **kwargs):
             if not self.salt:
                 hasher = get_hasher()
                 self.salt = hasher.salt().decode('utf-8')
+        self.last_modification_date = timezone.now()
         super(Petition, self).save(*args, **kwargs)
 
 
@@ -610,11 +614,18 @@ def create_user_profile(sender, instance, created, **kwargs):
 def save_user_profile(sender, instance, **kwargs):
     instance.pytitionuser.save()
 
+@receiver(pre_save, sender=Petition)
+def pre_save_petition(sender, instance, **kwargs):
+    if not instance.creation_date:
+        instance.creation_date = timezone.now()
 
 @receiver(post_save, sender=Petition)
 def save_petition(sender, instance, **kwargs):
     if instance.slugmodel_set.count() == 0:
         instance.slugify()
+    if kwargs['created']:
+        instance.creation_date = timezone.now()
+        instance.save()
 
 @receiver(post_delete, sender=PytitionUser)
 def post_delete_user(sender, instance, *args, **kwargs):