diff --git a/graphene_django_pretty/auth/decorators.py b/graphene_django_pretty/auth/decorators.py
index 6b32c85..51c1136 100644
--- a/graphene_django_pretty/auth/decorators.py
+++ b/graphene_django_pretty/auth/decorators.py
@@ -1,10 +1,10 @@
-from typing import List, Union
 from functools import partial, wraps
+from typing import List, Union
 
 from django.contrib.auth import get_user_model
 from graphql.execution.execute import GraphQLResolveInfo
-from graphene_django_pretty.auth.exceptions import PermissionDeniedError
 
+from graphene_django_pretty.auth.exceptions import PermissionDeniedError
 
 User = get_user_model()
 
diff --git a/graphene_django_pretty/mutations/base.py b/graphene_django_pretty/mutations/base.py
index b01ffbe..c6ae506 100644
--- a/graphene_django_pretty/mutations/base.py
+++ b/graphene_django_pretty/mutations/base.py
@@ -1,6 +1,6 @@
 import graphene
-from graphene.utils import get_unbound_function, props
 from fs_graphene_django.mutations.mutations.utils import decorate_mutate_func
+from graphene.utils import get_unbound_function, props
 
 
 class BaseMutation(graphene.Mutation):
diff --git a/graphene_django_pretty/types/base.py b/graphene_django_pretty/types/base.py
index 78f78ad..7944024 100644
--- a/graphene_django_pretty/types/base.py
+++ b/graphene_django_pretty/types/base.py
@@ -1,25 +1,23 @@
 import warnings
-import graphene
-
 from copy import deepcopy
 from typing import Any, Dict, List, Type
 
-from fs_graphene_django.types.registry import FieldDescriptionDrivenRegistry
-from graphene import Field
+import graphene
 from graphene.relay import Connection, Node
 from graphene.types.interface import Interface
 from graphene.types.objecttype import ObjectType, ObjectTypeOptions
 from graphene.types.utils import yank_fields_from_attrs
+from graphene_django import DjangoObjectType
 from graphene_django.registry import Registry
 from graphene_django.types import (
     ALL_FIELDS,
     DJANGO_FILTER_INSTALLED,
-    DjangoObjectTypeOptions,
     construct_fields,
     get_global_registry,
     validate_fields,
 )
 
+from graphene_django_pretty.types.registry import FieldDescriptionDrivenRegistry
 from graphene_django_pretty.types.utils import is_valid_django_model
 
 
@@ -36,7 +34,42 @@ class PatchedDjangoObjectTypeOptions(ObjectTypeOptions):
     default_resolver = None
 
 
-class BaseDjangoObjectType(ObjectType):
+class BaseDjangoModelUnion(graphene.Union):
+    """Base union type for django object types."""
+
+    class Meta:
+        abstract = True
+
+    @classmethod
+    def assert_type_subclass(cls, type_):
+        """Assert if type is not DjangoObjectType subclass."""
+        assert issubclass(
+            type_,
+            DjangoObjectType,
+        ), f'Must provide Django object types for Union {cls.__name__}.'
+
+    @classmethod
+    def __init_subclass_with_meta__(cls, types=None, **options):
+        if types:
+            for type_ in types:
+                cls.assert_type_subclass(type_)
+
+        super(BaseDjangoModelUnion, cls).__init_subclass_with_meta__(
+            types=types,
+            **options,
+        )
+
+    @classmethod
+    def resolve_type(cls, instance, info):
+        """Resolving grapql type by models instance."""
+        if getattr(cls._meta, 'types', False):
+            for type_ in cls._meta.types:
+                if isinstance(instance, type_._meta.model):
+                    return type_
+        return None
+
+
+class BaseDjangoObjectType(DjangoObjectType):
     """
     Redefined class for adding possibility of getting field description and auto add it to schema.
     Class in general repeats DjangoObjectType, but adds defining of interface fields
@@ -45,7 +78,10 @@ class BaseDjangoObjectType(ObjectType):
 
     id = graphene.ID(required=True, description='ID of the object')
 
-    @classmethod
+    class Meta:
+        abstract = True
+
+    @ classmethod
     def __init_subclass_with_meta__(
         cls,
         model=None,
@@ -77,16 +113,20 @@ def __init_subclass_with_meta__(
             'Registry, received "{}".'
         ).format(cls.__name__, registry)
 
-        assert filter_fields and filterset_class, "Can't set both filter_fields and filterset_class"
+        if filter_fields and filterset_class:
+            raise Exception("Can't set both filter_fields and filterset_class")
 
-        assert DJANGO_FILTER_INSTALLED and (filter_fields or filterset_class), (
-            "Can only set filter_fields or filterset_class if "
-            "Django-Filter is installed"
-        )
+        if not DJANGO_FILTER_INSTALLED and (filter_fields or filterset_class):
+            raise Exception(
+                (
+                    "Can only set filter_fields or filterset_class if "
+                    "Django-Filter is installed"
+                ),
+            )
 
         assert not (fields and exclude), (
             "Cannot set both 'fields' and 'exclude' options on "
-            "DjangoObjectType {class_name}.".format(class_name=cls.__name__)
+            'DjangoObjectType {class_name}.'.format(class_name=cls.__name__)
         )
 
         if fields and fields != ALL_FIELDS and not isinstance(fields, (list, tuple)):
@@ -112,8 +152,14 @@ def __init_subclass_with_meta__(
             )
 
         django_fields = yank_fields_from_attrs(
-            construct_fields(model, registry, fields, exclude, convert_choices_to_enum),
-            _as=Field,
+            construct_fields(
+                model,
+                registry,
+                fields,
+                exclude,
+                convert_choices_to_enum,
+            ),
+            _as=graphene.Field,
         )
 
         if use_connection is None and interfaces:
@@ -127,13 +173,13 @@ def __init_subclass_with_meta__(
                 connection_class = Connection
 
             connection = connection_class.create_type(
-                "{}Connection".format(options.get("name") or cls.__name__),
+                '{}Connection'.format(options.get("name") or cls.__name__),
                 node=cls,
             )
 
         if connection is not None:
             assert issubclass(connection, Connection), (
-                "The connection must be a Connection. Received {}"
+                'The connection must be a Connection. Received {}'
             ).format(connection.__name__)
 
         if not _meta:
@@ -142,7 +188,10 @@ def __init_subclass_with_meta__(
         # Added in this class instead original DjangoObjectType:
         # Getting fields for django-model anf graphene model and merging them
         interface_fields = cls.get_interface_fields(interfaces)
-        merged_fields = cls.merge_model_and_interface_fields(django_fields, interface_fields)
+        merged_fields = cls.merge_model_and_interface_fields(
+            django_fields,
+            interface_fields,
+        )
 
         _meta.model = model
         _meta.registry = registry
@@ -175,12 +224,21 @@ def get_interface_fields(cls, interfaces: List[Type[Interface]]) -> Dict[str, An
             fields.update(interface._meta.fields)
 
         for base in reversed(cls.__mro__):
-            fields.update(yank_fields_from_attrs(base.__dict__, _as=Field))
+            fields.update(
+                yank_fields_from_attrs(
+                    base.__dict__,
+                    _as=graphene.Field,
+                ),
+            )
 
         return fields
 
     @classmethod
-    def merge_model_and_interface_fields(cls, django_fields, interface_fields) -> Dict[str, Any]:
+    def merge_model_and_interface_fields(
+        cls,
+        django_fields,
+        interface_fields,
+    ) -> Dict[str, Any]:
         """
         Returns merged fields with solved conflicts in field description.
         For example, when Interface filed has got own field description and Django Models's Field has got own.
@@ -191,7 +249,9 @@ def merge_model_and_interface_fields(cls, django_fields, interface_fields) -> Di
         for field_name, field_description in interface_fields.items():
             # replace description from interface if it is not none.
             if field_description.description:
-                merged_fields.get(field_name).description = field_description.description
+                merged_fields.get(
+                    field_name,
+                ).description = field_description.description
 
         return merged_fields
 
@@ -201,7 +261,9 @@ def is_type_of(cls, root, info):
         if isinstance(root, cls):
             return True
         if not is_valid_django_model(root.__class__):
-            raise Exception(('Received incompatible instance "{}".').format(root))
+            raise Exception(
+                ('Received incompatible instance "{}".').format(root),
+            )
 
         if cls._meta.model._meta.proxy:
             model = root._meta.model
@@ -218,8 +280,6 @@ def node_resolver(cls, _, info, id):  # noqa: WPS125
     @classmethod
     def NodeField(cls):  # noqa: N802
         """New Node field."""
-        node_field = graphene.relay.Node.Field(cls)
+        node_field = Node.Field(cls)
         node_field.wrap_resolve = lambda parent: cls.node_resolver
         return node_field
-
-
diff --git a/graphene_django_pretty/types/registry.py b/graphene_django_pretty/types/registry.py
index 89c9e3c..98f9f65 100644
--- a/graphene_django_pretty/types/registry.py
+++ b/graphene_django_pretty/types/registry.py
@@ -8,6 +8,10 @@ class FieldDescriptionDrivenRegistry(Registry):
     def set_graphene_field_description(field, converted):
         """Updates kwargs for description key from model field definition of graphql description is empty."""
         field_description = None
+        #TODO: Fix this converted field value
+        if not getattr(converted, 'kwargs', None):
+            return
+
         graphene_field_description = converted.kwargs.get('description', None)
         if not graphene_field_description:
             field_description = field.verbose_name
diff --git a/graphene_django_pretty/types/utils.py b/graphene_django_pretty/types/utils.py
index 7357a1c..fdd12a7 100644
--- a/graphene_django_pretty/types/utils.py
+++ b/graphene_django_pretty/types/utils.py
@@ -1,5 +1,6 @@
-from typing import Any
 import inspect
+from itertools import chain
+from typing import Any
 
 from django.db import models
 
@@ -15,3 +16,16 @@ def is_valid_django_model(model: Any) -> bool:
         return issubclass(model, PolymorphicModel)
 
     return is_django_model
+
+
+def merge_querysets(*querysets, **kwargs):
+    """Merge querysets function."""
+    sort_key = kwargs['sort_key']
+    reverse_needed = kwargs['reverse']
+    queryset = list(chain(*querysets))
+    if sort_key:
+        reverse = reverse_needed if reverse_needed else False
+        queryset.sort(key=lambda qs_item: getattr(
+            qs_item, sort_key), reverse=reverse)
+
+    return queryset
diff --git a/graphene_django_pretty/utils.py b/graphene_django_pretty/utils.py
index 4ad5726..c5a0949 100644
--- a/graphene_django_pretty/utils.py
+++ b/graphene_django_pretty/utils.py
@@ -1,7 +1,5 @@
 from functools import wraps
 
-from server.core.auth.jwt.exceptions import PermissionDenied
-
 try:
     import django_filters  # noqa
 
diff --git a/graphene_django_pretty/views.py b/graphene_django_pretty/views.py
index 3c17c69..c034c89 100644
--- a/graphene_django_pretty/views.py
+++ b/graphene_django_pretty/views.py
@@ -1,5 +1,5 @@
-from graphene_django.views import GraphQLView
 from fs_graphene_django.error.format import format_error
+from graphene_django.views import GraphQLView
 
 
 class PrettyGraphQLView(GraphQLView):
diff --git a/poetry.lock b/poetry.lock
index 82be377..e02c930 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -171,7 +171,7 @@ testing = ["sphinx", "flake8", "pytest", "pytest-cov", "pytest-virtualenv", "pyt
 
 [[package]]
 name = "coverage"
-version = "6.3.1"
+version = "6.3.2"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
@@ -1474,47 +1474,47 @@ configupdater = [
     {file = "ConfigUpdater-3.0.1.tar.gz", hash = "sha256:372a6a6ef598a118ec17927bec9486a7d36f44ccd3e641e879e0bf998b70924e"},
 ]
 coverage = [
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     {file = "MarkupSafe-2.0.1-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:f8ba0e8349a38d3001fae7eadded3f6606f0da5d748ee53cc1dab1d6527b9509"},
+    {file = "MarkupSafe-2.0.1-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:c47adbc92fc1bb2b3274c4b3a43ae0e4573d9fbff4f54cd484555edbf030baf1"},
+    {file = "MarkupSafe-2.0.1-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:37205cac2a79194e3750b0af2a5720d95f786a55ce7df90c3af697bfa100eaac"},
+    {file = "MarkupSafe-2.0.1-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:1f2ade76b9903f39aa442b4aadd2177decb66525062db244b35d71d0ee8599b6"},
+    {file = "MarkupSafe-2.0.1-cp39-cp39-musllinux_1_1_aarch64.whl", hash = "sha256:4296f2b1ce8c86a6aea78613c34bb1a672ea0e3de9c6ba08a960efe0b0a09047"},
+    {file = "MarkupSafe-2.0.1-cp39-cp39-musllinux_1_1_i686.whl", hash = "sha256:9f02365d4e99430a12647f09b6cc8bab61a6564363f313126f775eb4f6ef798e"},
+    {file = "MarkupSafe-2.0.1-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:5b6d930f030f8ed98e3e6c98ffa0652bdb82601e7a016ec2ab5d7ff23baa78d1"},
     {file = "MarkupSafe-2.0.1-cp39-cp39-win32.whl", hash = "sha256:10f82115e21dc0dfec9ab5c0223652f7197feb168c940f3ef61563fc2d6beb74"},
     {file = "MarkupSafe-2.0.1-cp39-cp39-win_amd64.whl", hash = "sha256:693ce3f9e70a6cf7d2fb9e6c9d8b204b6b39897a2c4a1aa65728d5ac97dcc1d8"},
     {file = "MarkupSafe-2.0.1.tar.gz", hash = "sha256:594c67807fb16238b30c44bdf74f36c02cdf22d1c8cda91ef8a0ed8dabf5620a"},
@@ -1885,6 +1920,10 @@ restructuredtext-lint = [
     {file = "ruamel.yaml-0.17.20.tar.gz", hash = "sha256:4b8a33c1efb2b443a93fcaafcfa4d2e445f8e8c29c528d9f5cdafb7cc9e4004c"},
 ]
 "ruamel.yaml.clib" = [
+    {file = "ruamel.yaml.clib-0.2.6-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:6e7be2c5bcb297f5b82fee9c665eb2eb7001d1050deaba8471842979293a80b0"},
+    {file = "ruamel.yaml.clib-0.2.6-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl", hash = "sha256:221eca6f35076c6ae472a531afa1c223b9c29377e62936f61bc8e6e8bdc5f9e7"},
+    {file = "ruamel.yaml.clib-0.2.6-cp310-cp310-win32.whl", hash = "sha256:1070ba9dd7f9370d0513d649420c3b362ac2d687fe78c6e888f5b12bf8bc7bee"},
+    {file = "ruamel.yaml.clib-0.2.6-cp310-cp310-win_amd64.whl", hash = "sha256:77df077d32921ad46f34816a9a16e6356d8100374579bc35e15bab5d4e9377de"},
     {file = "ruamel.yaml.clib-0.2.6-cp35-cp35m-macosx_10_6_intel.whl", hash = "sha256:cfdb9389d888c5b74af297e51ce357b800dd844898af9d4a547ffc143fa56751"},
     {file = "ruamel.yaml.clib-0.2.6-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:7b2927e92feb51d830f531de4ccb11b320255ee95e791022555971c466af4527"},
     {file = "ruamel.yaml.clib-0.2.6-cp35-cp35m-win32.whl", hash = "sha256:ada3f400d9923a190ea8b59c8f60680c4ef8a4b0dfae134d2f2ff68429adfab5"},
diff --git a/setup.cfg b/setup.cfg
index f0ba058..ea0d78f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -36,8 +36,10 @@ exclude =
 
 # Ignoring some error in some files:
 per-file-ignores =
-  # Enable `assert` keyword and magic numbers for tests:
+  # Enable `assert` keyword ansd magic numbers for tests:
   tests/*.py: S101, WPS226, WPS432
+  graphene_django_pretty/types/base.py: WPS437, P101, WPS454, WPS110, E501, D205, S101, Q000, WPS323, WPS305, WPS121, 
+  WPS326, PT018, WPS404, B008, WPS210, WPS218, C901, WPS201, WPS400, WPS211, WPS122, WPS231, D105, F821, WPS608, WPS306, WPS238
 
 
 [isort]
diff --git a/tests/django_setup/models.py b/tests/django_setup/models.py
index 16d4ab6..4a71789 100644
--- a/tests/django_setup/models.py
+++ b/tests/django_setup/models.py
@@ -5,8 +5,13 @@ class Author(models.Model):
     name = models.CharField(max_length=255)
 
 
-
 class Post(models.Model):
-    author = models.ForeignKey(Author, on_delete=models.CASCADE)
+    author = models.ForeignKey(
+        Author, on_delete=models.CASCADE, related_name='posts')
     text = models.TextField()
 
+
+class Article(models.Model):
+    author = models.ForeignKey(
+        Author, on_delete=models.CASCADE, related_name='articles')
+    text = models.TextField()
diff --git a/tests/django_setup/schema.py b/tests/django_setup/schema.py
index 879e17a..ef3cf0e 100644
--- a/tests/django_setup/schema.py
+++ b/tests/django_setup/schema.py
@@ -1,4 +1,5 @@
 import graphene
+
 from graphene_django_pretty.mutations.base import BaseMutation
 from graphene_django_pretty.mutations.output import BasePayload
 
diff --git a/tests/django_setup/settings.py b/tests/django_setup/settings.py
index cbe45f9..0382249 100644
--- a/tests/django_setup/settings.py
+++ b/tests/django_setup/settings.py
@@ -1,5 +1,5 @@
-import sys
 import os
+import sys
 
 ROOT_PATH = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, ROOT_PATH + "/tests/django_setup")
diff --git a/tests/django_setup/urls.py b/tests/django_setup/urls.py
index 6c74d9f..3be8fcb 100644
--- a/tests/django_setup/urls.py
+++ b/tests/django_setup/urls.py
@@ -2,7 +2,6 @@
 
 from graphene_django_pretty.views import PrettyGraphQLView
 
-
 urlpatterns = [
     path('graphql/batch', PrettyGraphQLView.as_view(batch=True)),
     path('graphql', PrettyGraphQLView.as_view(graphiql=True)),
diff --git a/tests/test_auth/test_decorators.py b/tests/test_auth/test_decorators.py
index 1188adc..eadf122 100644
--- a/tests/test_auth/test_decorators.py
+++ b/tests/test_auth/test_decorators.py
@@ -1,7 +1,7 @@
 import pytest
 
-from graphene_django_pretty.auth.exceptions import PermissionDeniedError
 from graphene_django_pretty.auth.decorators import login_required
+from graphene_django_pretty.auth.exceptions import PermissionDeniedError
 
 
 def test_authenticated_login_required(authenticated_graphql_info, resolver_func):
diff --git a/tests/test_types/test_union.py b/tests/test_types/test_union.py
new file mode 100644
index 0000000..b5520fc
--- /dev/null
+++ b/tests/test_types/test_union.py
@@ -0,0 +1,55 @@
+import graphene
+import pytest
+
+from graphene_django_pretty.types.base import BaseDjangoModelUnion, BaseDjangoObjectType
+from tests.django_setup.models import Article, Author, Post
+
+
+class PostType(BaseDjangoObjectType):
+
+    class Meta:
+        model = Post
+
+
+class ArticleType(BaseDjangoObjectType):
+
+    class Meta:
+        model = Article
+
+
+@pytest.fixture()
+def data():
+    author = Author.objects.create(name='test')
+    return (
+        Article.objects.create(author=author, text='test'),
+        Post.objects.create(author=author, text='test'),
+    )
+
+
+@pytest.mark.django_db()
+def test_union_type_resolvers(data):
+    class TextUnion(BaseDjangoModelUnion):
+
+        class Meta:
+            types = (PostType, ArticleType)
+    assert TextUnion.resolve_type(data[0], None) == ArticleType
+    assert TextUnion.resolve_type(data[1], None) == PostType
+
+
+def test_assert_none_types():
+    with pytest.raises(AssertionError):
+        class TestUnion(BaseDjangoModelUnion):
+
+            class Meta:
+                types = ()
+
+
+def test_assert_invalid_types():
+    class TestType(graphene.ObjectType):
+        test_field = graphene.String()
+
+    with pytest.raises(AssertionError):
+        class TestUnion(BaseDjangoModelUnion):
+
+            class Meta:
+                types = (TestType,)