Read only fields + Updated date for Publication model

sigma_publications/migrations/0006_publication_updated.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2016-02-15 16:46
+from __future__ import unicode_literals
+
+import datetime
+from django.db import migrations, models
+from django.utils.timezone import utc
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sigma_publications', '0005_auto_20160215_1718'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='publication',
+            name='updated',
+            field=models.DateTimeField(auto_now=True, default=datetime.datetime(2016, 2, 15, 16, 46, 19, 370696, tzinfo=utc)),
+            preserve_default=False,
+        ),
+    ]

sigma_publications/models.py

@@ -14,6 +14,7 @@ class Publication(models.Model):
 
     # Link to event ?
     created = models.DateTimeField(auto_now_add=True)
+    updated = models.DateTimeField(auto_now=True)
     text = models.TextField()
 
     posted_in = models.ManyToManyField(Group, through='GroupPost', related_name="publications")

sigma_publications/serializers.py

@@ -7,6 +7,7 @@
 class PublicationSerializer(serializers.ModelSerializer):
     class Meta:
         model = Publication
+        read_only_fields = ('poster_group', 'poster_user')
 
     poster_group = serializers.PrimaryKeyRelatedField(allow_null=True, queryset=Group.objects.all())
     poster_user = serializers.PrimaryKeyRelatedField(