diff --git a/heat/objects/event.py b/heat/objects/event.py
index cf09072e0..7dbc73100 100644
--- a/heat/objects/event.py
+++ b/heat/objects/event.py
@@ -25,9 +25,9 @@ from heat.objects import fields as heat_fields
 
 class Event(base.VersionedObject, base.VersionedObjectDictCompat):
     fields = {
-        'id': fields.IntegerField(nullable=False),
-        'stack_id': fields.StringField(nullable=False),
-        'uuid': fields.StringField(nullable=False),
+        'id': fields.IntegerField(),
+        'stack_id': fields.StringField(),
+        'uuid': fields.StringField(),
         'resource_action': fields.StringField(nullable=True),
         'resource_status': fields.StringField(nullable=True),
         'resource_name': fields.StringField(nullable=True),
diff --git a/heat/objects/resource.py b/heat/objects/resource.py
index fde4cc088..12bd71fce 100755
--- a/heat/objects/resource.py
+++ b/heat/objects/resource.py
@@ -35,7 +35,7 @@ class Resource(
     fields = {
         'id': fields.IntegerField(),
         'uuid': fields.StringField(),
-        'stack_id': fields.StringField(nullable=False),
+        'stack_id': fields.StringField(),
         'created_at': fields.DateTimeField(read_only=True),
         'updated_at': fields.DateTimeField(nullable=True),
         'nova_instance': fields.StringField(nullable=True),
@@ -49,7 +49,7 @@ class Resource(
             resource_data.ResourceData,
             nullable=True
         ),
-        'stack': fields.ObjectField(stack.Stack, nullable=False),
+        'stack': fields.ObjectField(stack.Stack),
         'engine_id': fields.StringField(nullable=True),
         'atomic_key': fields.IntegerField(nullable=True),
         'current_template_id': fields.IntegerField(),
diff --git a/heat/objects/resource_data.py b/heat/objects/resource_data.py
index 321d7e432..83764fcb7 100644
--- a/heat/objects/resource_data.py
+++ b/heat/objects/resource_data.py
@@ -36,7 +36,7 @@ class ResourceData(
         'key': fields.StringField(nullable=True),
         'value': fields.StringField(nullable=True),
         'redact': fields.BooleanField(nullable=True),
-        'resource_id': fields.IntegerField(nullable=False),
+        'resource_id': fields.IntegerField(),
         'decrypt_method': fields.StringField(nullable=True),
     }
 
diff --git a/heat/objects/snapshot.py b/heat/objects/snapshot.py
index 3a774d5f0..2c5abdc3f 100644
--- a/heat/objects/snapshot.py
+++ b/heat/objects/snapshot.py
@@ -31,9 +31,9 @@ class Snapshot(base.VersionedObject,
     fields = {
         'id': fields.StringField(),
         'name': fields.StringField(nullable=True),
-        'stack_id': fields.StringField(nullable=False),
+        'stack_id': fields.StringField(),
         'data': heat_fields.JsonField(nullable=True),
-        'tenant': fields.StringField(nullable=False),
+        'tenant': fields.StringField(),
         'status': fields.StringField(nullable=True),
         'status_reason': fields.StringField(nullable=True),
         'created_at': fields.DateTimeField(read_only=True),
diff --git a/heat/objects/software_config.py b/heat/objects/software_config.py
index c6b8acf5d..2d09a603c 100644
--- a/heat/objects/software_config.py
+++ b/heat/objects/software_config.py
@@ -29,7 +29,7 @@ class SoftwareConfig(base.VersionedObject,
                      base.VersionedObjectDictCompat,
                      base.ComparableVersionedObject):
     fields = {
-        'id': fields.StringField(nullable=False),
+        'id': fields.StringField(),
         'name': fields.StringField(nullable=True),
         'group': fields.StringField(nullable=True),
         'tenant': fields.StringField(nullable=True),
diff --git a/heat/objects/software_deployment.py b/heat/objects/software_deployment.py
index d81c39865..c1fdda369 100644
--- a/heat/objects/software_deployment.py
+++ b/heat/objects/software_deployment.py
@@ -30,12 +30,12 @@ class SoftwareDeployment(base.VersionedObject,
                          base.VersionedObjectDictCompat,
                          base.ComparableVersionedObject):
     fields = {
-        'id': fields.StringField(nullable=False),
-        'config_id': fields.StringField(nullable=False),
-        'server_id': fields.StringField(nullable=False),
+        'id': fields.StringField(),
+        'config_id': fields.StringField(),
+        'server_id': fields.StringField(),
         'input_values': heat_fields.JsonField(nullable=True),
         'output_values': heat_fields.JsonField(nullable=True),
-        'tenant': fields.StringField(nullable=False),
+        'tenant': fields.StringField(),
         'stack_user_project_id': fields.StringField(nullable=True),
         'action': fields.StringField(nullable=True),
         'status': fields.StringField(nullable=True),
diff --git a/heat/objects/watch_data.py b/heat/objects/watch_data.py
index 4f0efc358..b9bdde49b 100644
--- a/heat/objects/watch_data.py
+++ b/heat/objects/watch_data.py
@@ -26,9 +26,9 @@ from heat.objects import fields as heat_fields
 class WatchData(base.VersionedObject, base.VersionedObjectDictCompat):
 
     fields = {
-        'id': fields.IntegerField(nullable=False),
+        'id': fields.IntegerField(),
         'data': heat_fields.JsonField(nullable=True),
-        'watch_rule_id': fields.StringField(nullable=False),
+        'watch_rule_id': fields.StringField(),
         'watch_rule': fields.ObjectField('WatchRule'),
         'created_at': fields.DateTimeField(read_only=True),
         'updated_at': fields.DateTimeField(nullable=True),
diff --git a/heat/objects/watch_rule.py b/heat/objects/watch_rule.py
index d63cd4a07..86aebb2b4 100644
--- a/heat/objects/watch_rule.py
+++ b/heat/objects/watch_rule.py
@@ -28,12 +28,12 @@ from heat.objects import watch_data
 class WatchRule(base.VersionedObject, base.VersionedObjectDictCompat):
 
     fields = {
-        'id': fields.IntegerField(nullable=False),
+        'id': fields.IntegerField(),
         'name': fields.StringField(nullable=True),
         'rule': heat_fields.JsonField(nullable=True),
         'state': fields.StringField(nullable=True),
         'last_evaluated': fields.DateTimeField(nullable=True),
-        'stack_id': fields.StringField(nullable=False),
+        'stack_id': fields.StringField(),
         'stack': fields.ObjectField(stack.Stack),
         'watch_data': fields.ListOfObjectsField(watch_data.WatchData),
         'created_at': fields.DateTimeField(read_only=True),