diff --git a/apps/assets/serializers/asset/host.py b/apps/assets/serializers/asset/host.py
index 62638035d..35f1ca00a 100644
--- a/apps/assets/serializers/asset/host.py
+++ b/apps/assets/serializers/asset/host.py
@@ -29,7 +29,7 @@ class HostInfoSerializer(serializers.Serializer):
 
 
 class HostSerializer(AssetSerializer):
-    info = HostInfoSerializer(allow_null=True)
+    info = HostInfoSerializer(required=False)
 
     class Meta(AssetSerializer.Meta):
         model = Host
diff --git a/apps/audits/signal_handlers.py b/apps/audits/signal_handlers.py
index 206b5e5f8..f395965c3 100644
--- a/apps/audits/signal_handlers.py
+++ b/apps/audits/signal_handlers.py
@@ -64,39 +64,39 @@ AUTH_BACKEND_LABEL_MAPPING = AuthBackendLabelMapping()
 
 
 M2M_NEED_RECORD = {
-    User.groups.through._meta.object_name: (
+    User.groups.through.__name__: (
         _('User and Group'),
         _('{User} JOINED {UserGroup}'),
         _('{User} LEFT {UserGroup}')
     ),
-    Asset.nodes.through._meta.object_name: (
+    Asset.nodes.through.__name__: (
         _('Node and Asset'),
         _('{Node} ADD {Asset}'),
         _('{Node} REMOVE {Asset}')
     ),
-    AssetPermission.users.through._meta.object_name: (
+    AssetPermission.users.through.__name__: (
         _('User asset permissions'),
         _('{AssetPermission} ADD {User}'),
         _('{AssetPermission} REMOVE {User}'),
     ),
-    AssetPermission.user_groups.through._meta.object_name: (
+    AssetPermission.user_groups.through.__name__: (
         _('User group asset permissions'),
         _('{AssetPermission} ADD {UserGroup}'),
         _('{AssetPermission} REMOVE {UserGroup}'),
     ),
-    AssetPermission.assets.through._meta.object_name: (
+    AssetPermission.assets.through.__name__: (
         _('Asset permission'),
         _('{AssetPermission} ADD {Asset}'),
         _('{AssetPermission} REMOVE {Asset}'),
     ),
-    AssetPermission.nodes.through._meta.object_name: (
+    AssetPermission.nodes.through.__name__: (
         _('Node permission'),
         _('{AssetPermission} ADD {Node}'),
         _('{AssetPermission} REMOVE {Node}'),
     ),
 }
 
-M2M_ACTION = {
+M2M_ACTION_MAPER = {
     POST_ADD: OperateLog.ACTION_CREATE,
     POST_REMOVE: OperateLog.ACTION_DELETE,
     POST_CLEAR: OperateLog.ACTION_DELETE,
@@ -104,34 +104,40 @@ M2M_ACTION = {
 
 
 @receiver(m2m_changed)
-def on_m2m_changed(sender, action, instance, reverse, model, pk_set, **kwargs):
-    if action not in M2M_ACTION:
+def on_m2m_changed(sender, action, instance, model, pk_set, **kwargs):
+    if action not in M2M_ACTION_MAPER:
         return
 
     user = current_request.user if current_request else None
     if not user or not user.is_authenticated:
         return
 
-    sender_name = sender._meta.object_name
+    sender_name = sender.__name__
     if sender_name in M2M_NEED_RECORD:
         org_id = current_org.id
         remote_addr = get_request_ip(current_request)
         user = str(user)
         resource_type, resource_tmpl_add, resource_tmpl_remove = M2M_NEED_RECORD[sender_name]
-        action = M2M_ACTION[action]
+
+        action = M2M_ACTION_MAPER[action]
         if action == OperateLog.ACTION_CREATE:
             resource_tmpl = resource_tmpl_add
         elif action == OperateLog.ACTION_DELETE:
             resource_tmpl = resource_tmpl_remove
+        else:
+            return
 
         to_create = []
         objs = model.objects.filter(pk__in=pk_set)
 
-        instance_name = instance._meta.object_name
+        if isinstance(instance, Asset):
+            instance_name = Asset.__name__
+        else:
+            instance_name = instance.__class__.__name__
         instance_value = str(instance)
+        model_name = model.__name__
 
-        model_name = model._meta.object_name
-
+        print("Instace name: ", instance_name, instance_value)
         for obj in objs:
             resource = resource_tmpl.format(**{
                 instance_name: instance_value,
diff --git a/apps/common/drf/fields.py b/apps/common/drf/fields.py
index 31386b0a0..8dc88ae9e 100644
--- a/apps/common/drf/fields.py
+++ b/apps/common/drf/fields.py
@@ -4,6 +4,7 @@ import six
 
 from rest_framework.fields import ChoiceField
 from rest_framework import serializers
+from django.utils.translation import gettext_lazy as _
 from django.core.exceptions import ObjectDoesNotExist
 
 from common.utils import decrypt_password
@@ -64,6 +65,12 @@ class LabeledChoiceField(ChoiceField):
 
 
 class ObjectRelatedField(serializers.RelatedField):
+    default_error_messages = {
+        'required': _('This field is required.'),
+        'does_not_exist': _('Invalid pk "{pk_value}" - object does not exist.'),
+        'incorrect_type': _('Incorrect type. Expected pk value, received {data_type}.'),
+    }
+
     def __init__(self, **kwargs):
         self.attrs = kwargs.pop('attrs', None) or ('id', 'name')
         self.many = kwargs.get('many', False)
@@ -76,10 +83,10 @@ class ObjectRelatedField(serializers.RelatedField):
         return data
 
     def to_internal_value(self, data):
-        if isinstance(data, dict):
-            pk = data.get(self.attrs[0])
-        else:
+        if not isinstance(data, dict):
             pk = data
+        else:
+            pk = data.get('id') or data.get('pk') or data.get(self.attrs[0])
         queryset = self.get_queryset()
         try:
             if isinstance(data, bool):