use postgres json field

pandora/documentcollection/migrations/0003_jsonfield.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.4 on 2018-06-19 17:23
+from __future__ import unicode_literals
+
+import django.contrib.postgres.fields.jsonb
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('documentcollection', '0002_collection_groups'),
+    ]
+
+    operations = [
+        migrations.RunSQL(
+            'ALTER TABLE "documentcollection_collection" ALTER COLUMN "query" TYPE jsonb USING "query"::text::jsonb'
+        ),
+        migrations.RunSQL(
+            'ALTER TABLE "documentcollection_collection" ALTER COLUMN "sort" TYPE jsonb USING "sort"::text::jsonb'
+        ),
+        migrations.RunSQL(
+            'ALTER TABLE "documentcollection_collection" ALTER COLUMN "poster_frames" TYPE jsonb USING "poster_frames"::text::jsonb'
+        ),
+    ]

pandora/documentcollection/models.py

@@ -11,11 +11,10 @@ from django.db.models import Max
 from django.contrib.auth.models import User, Group
 from django.conf import settings
 from django.utils.encoding import python_2_unicode_compatible
+from oxdjango.fields import JSONField
 
 import ox
 
-from oxdjango.fields import DictField, TupleField
-
 from archive import extract
 from user.utils import update_groups
 
@@ -47,16 +46,16 @@ class Collection(models.Model):
     name = models.CharField(max_length=255)
     status = models.CharField(max_length=20, default='private')
     _status = ['private', 'public', 'featured']
-    query = DictField(default={"static": True})
+    query = JSONField(default=lambda: {"static": True}, editable=False)
     type = models.CharField(max_length=255, default='static')
     description = models.TextField(default='')
 
     icon = models.ImageField(default=None, blank=True, upload_to=get_icon_path)
 
     view = models.TextField(default=get_collectionview)
-    sort = TupleField(default=get_collectionsort, editable=False)
+    sort = JSONField(default=get_collectionsort, editable=False)
 
-    poster_frames = TupleField(default=[], editable=False)
+    poster_frames = JSONField(default=[], editable=False)
 
     #is through table still required?
     documents = models.ManyToManyField('document.Document', related_name='collections',