diff --git a/README.md b/README.md
index 77a02ca..93709bb 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 **aiosnow** is a Python [asyncio](https://docs.python.org/3/library/asyncio.html) library for interacting with ServiceNow programmatically. It hopes to be:
 
 - Convenient: A good deal of work is put into making **aiosnow** flexible and easy to use.
-- Performant: Remote API calls uses non-blocking sockets tracked by an event loop, allowing large amounts of lightweight request tasks to run concurrently.
+- Performant: Uses non-blocking I/O to allow large amounts of API request tasks to run concurrently while being friendly on system resources.
 - Modular: Core functionality is componentized into modules that are built with composability and extensibility in mind.
 
 *Example code*
diff --git a/aiosnow/models/common/base.py b/aiosnow/models/common/base.py
index 731d8dd..8fd610c 100644
--- a/aiosnow/models/common/base.py
+++ b/aiosnow/models/common/base.py
@@ -17,7 +17,7 @@
     methods,
 )
 
-from .schema import ModelSchema, Nested
+from .schema import ModelSchema, ModelSchemaMeta, Nested
 from .schema.fields import BaseField
 
 req_cls_map = {
@@ -30,36 +30,33 @@
 
 class BaseModelMeta(type):
     def __new__(mcs, name: str, bases: tuple, attrs: dict) -> Any:
-        fields = {}
+        attrs["fields"] = fields = {}
+        base_members = {}
 
         for base in bases:
-            fields.update(base.schema_cls._declared_fields)
-
-        for key, value in attrs.copy().items():
-            if isinstance(value, BaseField):
-                fields[key] = value
-                fields[key].name = key
-            elif isinstance(value, marshmallow.schema.SchemaMeta):
-                fields[key] = Nested(key, value, allow_none=True, required=False)
-            else:
-                continue
-
-            # Do not allow override of base members with schema Field attributes.
-            for base in bases:
-                existing_member = getattr(base, key, None)
-                if existing_member is not None and not issubclass(
-                    existing_member.__class__,
-                    (BaseField, marshmallow.schema.SchemaMeta),
-                ):
+            base_members.update(
+                {
+                    k: v
+                    for k, v in base.__dict__.items()
+                    if not isinstance(v, (BaseField, Nested, ModelSchemaMeta))
+                }
+            )
+            inherited_fields = getattr(base.schema_cls, "_declared_fields")
+            fields.update(inherited_fields)
+
+        for k, v in attrs.items():
+            if isinstance(v, (BaseField, Nested, ModelSchemaMeta)):
+                if k in base_members.keys():
                     raise InvalidFieldName(
-                        f"Field :{name}.{key}: conflicts with a base member, name it something else. "
+                        f"Field :{name}.{k}: conflicts with a base member, name it something else. "
                         f"The Field :attribute: parameter can be used to give a field an alias."
                     )
 
-        attrs["schema_cls"] = type(name + "Schema", (ModelSchema,), fields)
-        cls = super().__new__(mcs, name, bases, attrs)
+                fields[k] = v
 
-        return cls
+        # Create the Model Schema
+        attrs["schema_cls"] = type(name + "Schema", (ModelSchema,), attrs["fields"])
+        return super().__new__(mcs, name, bases, attrs)
 
 
 class BaseModel(metaclass=BaseModelMeta):
@@ -74,10 +71,8 @@ class BaseModel(metaclass=BaseModelMeta):
     def __init__(self, client: Client):
         self._client = client
         self.fields = dict(self.schema_cls.fields)
-        self.nested_fields = {
-            n: f for n, f in self.fields.items() if isinstance(f, Nested)
-        }
         self.schema = self.schema_cls(unknown=marshmallow.EXCLUDE)
+        self.nested_fields = getattr(self.schema, "nested_fields")
         self._primary_key = getattr(self.schema, "_primary_key")
 
     @property
diff --git a/aiosnow/models/common/schema/base.py b/aiosnow/models/common/schema/base.py
index 1adc60f..f448c66 100644
--- a/aiosnow/models/common/schema/base.py
+++ b/aiosnow/models/common/schema/base.py
@@ -1,4 +1,3 @@
-import warnings
 from typing import Any, Iterable, Tuple, Union
 
 import marshmallow
@@ -19,39 +18,42 @@
 
 class ModelSchemaMeta(marshmallow.schema.SchemaMeta):
     def __new__(mcs, name: str, bases: tuple, attrs: dict) -> Any:
-        attrs["fields"] = fields = {
-            k: v for k, v in attrs.items() if isinstance(v, (BaseField, Nested))
-        }
-        cls = super().__new__(mcs, name, bases, attrs)
-        for k, v in fields.items():
-            setattr(cls, k, v)
-
-        return cls
-
-
-class ModelSchema(marshmallow.Schema, metaclass=ModelSchemaMeta):
-    @property
-    def _primary_key(self) -> Union[str, None]:
-        pks = self._pk_candidates
+        fields = attrs["fields"] = {}
+        nested_fields = attrs["nested_fields"] = {}
+        pks = []
+
+        for k, v in attrs.items():
+            if isinstance(v, BaseField):
+                if v.is_primary:
+                    pks.append(k)
+
+                fields[k] = v
+                fields[k].name = k
+            elif isinstance(v, ModelSchemaMeta):
+                fields[k] = Nested(k, v, allow_none=True, required=False)
+                nested_fields.update({k: fields[k]})
+            else:
+                continue
 
-        if len(pks) > 1:
+        if len(pks) == 1:
+            attrs["_primary_key"] = pks[0]
+        elif len(pks) == 0:
+            attrs["_primary_key"] = None
+        elif len(pks) > 1:
             raise SchemaError(
                 f"Multiple primary keys (is_primary) supplied "
-                f"in {self.__class__.__name__}. Maximum allowed is 1."
+                f"in {name}. Maximum allowed is 1."
             )
-        elif len(pks) == 0:
-            return None
 
-        return pks[0]
+        cls = super().__new__(mcs, name, bases, {**attrs, **fields})
+
+        for k, v in fields.items():
+            setattr(cls, k, v)
+
+        return cls
 
-    @property
-    def _pk_candidates(self) -> list:
-        return [
-            n
-            for n, f in self.fields.items()
-            if isinstance(f, BaseField) and f.is_primary is True
-        ]
 
+class ModelSchema(marshmallow.Schema, metaclass=ModelSchemaMeta):
     @marshmallow.pre_load
     def _load_response(self, data: Union[list, dict], **_: Any) -> Union[list, dict]:
         """Load response content
@@ -85,12 +87,6 @@ def __load_response(self, content: dict) -> Iterable[Tuple[str, str]]:
         for key, value in content.items():
             field = self._declared_fields.get(key, None)
 
-            if not field:
-                warnings.warn(
-                    f"Unexpected field in response content: {key}, skipping..."
-                )
-                continue
-
             if isinstance(field, BaseField):
                 if isinstance(value, dict) and {"value", "display_value"} <= set(
                     value.keys()
diff --git a/aiosnow/request/base.py b/aiosnow/request/base.py
index 61dcb04..9396b5e 100644
--- a/aiosnow/request/base.py
+++ b/aiosnow/request/base.py
@@ -21,11 +21,11 @@ class BaseRequest(ABC):
     log = logging.getLogger("aiosnow.request")
 
     def __init__(
-        self, api_url: str, session: Session, fields: list = None,
+        self, api_url: str, session: Session, fields: dict = None,
     ):
         self.api_url = api_url
         self.session = session
-        self.fields = [str(f) for f in fields or []]
+        self.fields = fields or {}
         self.url_segments: List[str] = []
         self.headers_default = {"Content-type": CONTENT_TYPE}
         self._req_id = f"REQ_{hex(int(round(time.time() * 1000)))}"
diff --git a/aiosnow/request/get.py b/aiosnow/request/get.py
index ea1b423..8193cd2 100644
--- a/aiosnow/request/get.py
+++ b/aiosnow/request/get.py
@@ -1,16 +1,14 @@
-from __future__ import annotations
-
-from typing import Any, Dict, Iterable, Union
+from time import time
+from typing import Any, Generator, Union
 from urllib.parse import urlparse
 
 from . import methods
 from .base import BaseRequest
 
-_cache: dict = {}
-
 
 class GetRequest(BaseRequest):
     _method = methods.GET
+    _cache: dict = {}
 
     def __init__(
         self,
@@ -19,10 +17,11 @@ def __init__(
         limit: int = 10000,
         offset: int = 0,
         query: str = None,
+        cache_secs: int = 20,
         **kwargs: Any,
     ):
-        self.nested_fields = nested_fields or {}
-        self.nested_attrs = list(self._nested_attrs)
+        self.nested_fields = list(self._nested_with_path(nested_fields or {}, []))
+        self._cache_secs = cache_secs
         self._limit = offset + limit
         self._offset = offset
         self.query = query
@@ -42,56 +41,76 @@ def offset(self) -> int:
     def limit(self) -> int:
         return self._limit
 
-    @property
-    def _nested_attrs(self) -> Iterable:
-        for field in self.nested_fields.values():
-            yield from field.nested.fields.keys()
+    def _nested_with_path(self, fields: dict, path_base: list) -> Generator:
+        path = path_base or []
+
+        for k, v in fields.items():
+            if not hasattr(v, "nested"):
+                continue
+
+            yield path + [k], k, v.schema
+            yield from list(
+                self._nested_with_path(v.schema.fields, path_base=path + [k])
+            )
+
+    async def __expand_document(self, document: dict) -> dict:
+        for path, field_name, schema in self.nested_fields:
+            if not path or not isinstance(path, list):
+                continue
+
+            target_field = path[-1]
+            sub_document = document.copy()
+
+            for name in path[:-1]:
+                sub_document = sub_document[name]
 
-    async def _expand_nested(
+            if not sub_document.get(target_field):
+                continue
+            elif "link" not in sub_document[target_field]:
+                continue
+
+            nested_data = await self.get_cached(
+                sub_document[target_field]["link"], fields=schema.fields.keys()
+            )
+            sub_document[field_name] = nested_data
+            document.update(sub_document)
+
+        return document
+
+    async def _expand_document(
         self, content: Union[dict, list, None]
     ) -> Union[dict, list, None]:
         if not self.nested_fields:
             pass
         elif isinstance(content, dict):
-            nested = await self._resolve_nested(content)
-            content.update(nested)
+            content = await self.__expand_document(content)
         elif isinstance(content, list):
             for idx, record in enumerate(content):
-                nested = await self._resolve_nested(record)
-                content[idx].update(nested)
+                content[idx] = await self._expand_document(record)
 
         return content
 
-    async def _resolve_nested(self, content: dict) -> dict:
-        nested: Dict[Any, Any] = {}
-        nested_attrs = list(self.nested_attrs)
-
-        for field_name in self.nested_fields.keys():
-            item = content[field_name]
-            if not item or not item["display_value"]:
-                continue
-            elif "link" not in item:
-                nested[field_name] = item
-                continue
-
-            nested[field_name] = await self.get_cached(item["link"], nested_attrs)
-
-        return nested
+    async def get_cached(self, url: str, fields: list = None) -> dict:
+        cache_key = hash(url + "".join(fields or []))
+        record_id = urlparse(url).path.split("/")[-1]
 
-    async def get_cached(self, url: str, fields: list) -> dict:
-        if url not in _cache:
-            record_id = urlparse(url).path.split("/")[-1]
+        if (
+            cache_key in self._cache
+            and self._cache[cache_key][1] > time() - self._cache_secs
+        ):
+            self.log.debug(f"Feching {record_id} from cache")
+        else:
             request = GetRequest(url, self.session, fields=fields)
             response = await request._send(method=methods.GET)
             self.log.debug(f"Caching response for: {record_id}")
-            _cache[url] = response.data
+            self._cache[cache_key] = response.data, time()
 
-        return _cache[url]
+        return self._cache[cache_key][0]
 
     async def send(self, *args: Any, resolve: bool = True, **kwargs: Any) -> Any:
         response = await self._send(**kwargs)
         if resolve:
-            response.data = await self._expand_nested(response.data)
+            response.data = await self._expand_document(response.data)
 
         return response
 
diff --git a/poetry.lock b/poetry.lock
index 54d45b6..48d8e1b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,17 +1,18 @@
 [[package]]
 name = "aiohttp"
-version = "3.6.2"
+version = "3.7.2"
 description = "Async http client/server framework (asyncio)"
 category = "main"
 optional = false
-python-versions = ">=3.5.3"
+python-versions = ">=3.6"
 
 [package.dependencies]
-yarl = ">=1.0,<2.0"
-multidict = ">=4.5,<5.0"
-chardet = ">=2.0,<4.0"
-attrs = ">=17.3.0"
 async-timeout = ">=3.0,<4.0"
+attrs = ">=17.3.0"
+chardet = ">=2.0,<4.0"
+multidict = ">=4.5,<7.0"
+typing-extensions = ">=3.6.5"
+yarl = ">=1.0,<2.0"
 
 [package.extras]
 speedups = ["aiodns", "brotlipy", "cchardet"]
@@ -57,10 +58,10 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "sphinx-rtd-theme", "pre-commit"]
 docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
 tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "sphinx-rtd-theme", "pre-commit"]
 
 [[package]]
 name = "autoflake"
@@ -93,13 +94,13 @@ optional = false
 python-versions = ">=3.6"
 
 [package.dependencies]
-regex = "*"
-typed-ast = ">=1.4.0"
-toml = ">=0.9.4"
+appdirs = "*"
 attrs = ">=18.1.0"
-pathspec = ">=0.6,<1"
 click = ">=6.5"
-appdirs = "*"
+pathspec = ">=0.6,<1"
+regex = "*"
+toml = ">=0.9.4"
+typed-ast = ">=1.4.0"
 
 [package.extras]
 d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
@@ -114,8 +115,8 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
 packaging = "*"
-webencodings = "*"
 six = ">=1.9.0"
+webencodings = "*"
 
 [[package]]
 name = "certifi"
@@ -143,19 +144,19 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "codecov"
-version = "2.1.9"
+version = "2.1.10"
 description = "Hosted coverage reports for GitHub, Bitbucket and Gitlab"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.dependencies]
-requests = ">=2.7.9"
 coverage = "*"
+requests = ">=2.7.9"
 
 [[package]]
 name = "colorama"
-version = "0.4.3"
+version = "0.4.4"
 description = "Cross-platform colored terminal text."
 category = "dev"
 optional = false
@@ -213,16 +214,16 @@ testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
 
 [[package]]
 name = "isort"
-version = "5.5.3"
+version = "5.6.4"
 description = "A Python utility / library to sort Python imports."
 category = "dev"
 optional = false
 python-versions = ">=3.6,<4.0"
 
 [package.extras]
-colors = ["colorama (>=0.4.3,<0.5.0)"]
 pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
 requirements_deprecated_finder = ["pipreqs", "pip-api"]
+colors = ["colorama (>=0.4.3,<0.5.0)"]
 
 [[package]]
 name = "jinja2"
@@ -248,21 +249,21 @@ python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 
 [[package]]
 name = "marshmallow"
-version = "3.8.0"
+version = "3.9.0"
 description = "A lightweight library for converting complex datatypes to and from native Python datatypes."
 category = "main"
 optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-docs = ["sphinx (3.2.1)", "sphinx-issues (1.2.0)", "alabaster (0.7.12)", "sphinx-version-warning (1.1.2)", "autodocsumm (0.2.0)"]
+dev = ["pytest", "pytz", "simplejson", "mypy (0.790)", "flake8 (3.8.4)", "flake8-bugbear (20.1.4)", "pre-commit (>=2.4,<3.0)", "tox"]
+docs = ["sphinx (3.2.1)", "sphinx-issues (1.2.0)", "alabaster (0.7.12)", "sphinx-version-warning (1.1.2)", "autodocsumm (0.2.1)"]
+lint = ["mypy (0.790)", "flake8 (3.8.4)", "flake8-bugbear (20.1.4)", "pre-commit (>=2.4,<3.0)"]
 tests = ["pytest", "pytz", "simplejson"]
-lint = ["mypy (0.782)", "flake8 (3.8.3)", "flake8-bugbear (20.1.4)", "pre-commit (>=2.4,<3.0)"]
-dev = ["pytest", "pytz", "simplejson", "mypy (0.782)", "flake8 (3.8.3)", "flake8-bugbear (20.1.4)", "pre-commit (>=2.4,<3.0)", "tox"]
 
 [[package]]
 name = "more-itertools"
-version = "8.5.0"
+version = "8.6.0"
 description = "More routines for operating on iterables, beyond itertools"
 category = "dev"
 optional = false
@@ -270,7 +271,7 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "multidict"
-version = "4.7.6"
+version = "5.0.0"
 description = "multidict implementation"
 category = "main"
 optional = false
@@ -322,7 +323,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "pkginfo"
-version = "1.5.0.1"
+version = "1.6.1"
 description = "Query metadatdata from sdists / bdists / installed packages."
 category = "dev"
 optional = false
@@ -374,7 +375,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pygments"
-version = "2.7.1"
+version = "2.7.2"
 description = "Pygments is a syntax highlighting package written in Python."
 category = "dev"
 optional = false
@@ -397,16 +398,16 @@ optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.dependencies]
+atomicwrites = ">=1.0"
+attrs = ">=17.4.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\" and python_version != \"3.4\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 more-itertools = {version = ">=4.0.0", markers = "python_version > \"2.7\""}
-six = ">=1.10.0"
-py = ">=1.5.0"
-wcwidth = "*"
 packaging = "*"
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-colorama = {version = "*", markers = "sys_platform == \"win32\" and python_version != \"3.4\""}
-attrs = ">=17.4.0"
 pluggy = ">=0.12,<1.0"
-atomicwrites = ">=1.0"
+py = ">=1.5.0"
+six = ">=1.10.0"
+wcwidth = "*"
 
 [package.extras]
 testing = ["argcomplete", "hypothesis (>=3.56)", "nose", "requests", "mock"]
@@ -420,8 +421,8 @@ optional = false
 python-versions = "*"
 
 [package.dependencies]
-pytest = "*"
 aiohttp = ">=2.3.5"
+pytest = "*"
 
 [[package]]
 name = "pytest-asyncio"
@@ -446,15 +447,15 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-pytest = ">=4.6"
 coverage = ">=4.4"
+pytest = ">=4.6"
 
 [package.extras]
 testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
 name = "pytz"
-version = "2020.1"
+version = "2020.4"
 description = "World timezone definitions, modern and historical"
 category = "dev"
 optional = false
@@ -462,24 +463,24 @@ python-versions = "*"
 
 [[package]]
 name = "readme-renderer"
-version = "26.0"
+version = "28.0"
 description = "readme_renderer is a library for rendering \"readme\" descriptions for Warehouse"
 category = "dev"
 optional = false
 python-versions = "*"
 
 [package.dependencies]
+bleach = ">=2.1.0"
 docutils = ">=0.13.1"
 Pygments = ">=2.5.1"
 six = "*"
-bleach = ">=2.1.0"
 
 [package.extras]
 md = ["cmarkgfm (>=0.2.0)"]
 
 [[package]]
 name = "regex"
-version = "2020.9.27"
+version = "2020.10.28"
 description = "Alternative regular expression module, to replace re."
 category = "dev"
 optional = false
@@ -494,9 +495,9 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-idna = ">=2.5,<3"
 certifi = ">=2017.4.17"
 chardet = ">=3.0.2,<4"
+idna = ">=2.5,<3"
 urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
 
 [package.extras]
@@ -539,26 +540,26 @@ optional = false
 python-versions = ">=3.5"
 
 [package.dependencies]
-sphinxcontrib-qthelp = "*"
-imagesize = "*"
-sphinxcontrib-devhelp = "*"
-snowballstemmer = ">=1.1"
-babel = ">=1.3,<2.0 || >2.0"
 alabaster = ">=0.7,<0.8"
-sphinxcontrib-serializinghtml = "*"
-packaging = "*"
+babel = ">=1.3,<2.0 || >2.0"
+colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
 docutils = ">=0.12"
-Pygments = ">=2.0"
+imagesize = "*"
 Jinja2 = ">=2.3"
-colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
+packaging = "*"
+Pygments = ">=2.0"
 requests = ">=2.5.0"
+snowballstemmer = ">=1.1"
 sphinxcontrib-applehelp = "*"
+sphinxcontrib-devhelp = "*"
 sphinxcontrib-htmlhelp = "*"
 sphinxcontrib-jsmath = "*"
+sphinxcontrib-qthelp = "*"
+sphinxcontrib-serializinghtml = "*"
 
 [package.extras]
-test = ["pytest (<5.3.3)", "pytest-cov", "html5lib", "flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.761)", "docutils-stubs"]
 docs = ["sphinxcontrib-websupport"]
+test = ["pytest (<5.3.3)", "pytest-cov", "html5lib", "flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.761)", "docutils-stubs"]
 
 [[package]]
 name = "sphinxcontrib-applehelp"
@@ -569,8 +570,8 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-test = ["pytest"]
 lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
 name = "sphinxcontrib-devhelp"
@@ -581,8 +582,8 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-test = ["pytest"]
 lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
 name = "sphinxcontrib-htmlhelp"
@@ -593,8 +594,8 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-test = ["pytest", "html5lib"]
 lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest", "html5lib"]
 
 [[package]]
 name = "sphinxcontrib-jsmath"
@@ -616,8 +617,8 @@ optional = false
 python-versions = "*"
 
 [package.dependencies]
-six = ">=1.5.2"
 pockets = ">=0.3"
+six = ">=1.5.2"
 
 [[package]]
 name = "sphinxcontrib-qthelp"
@@ -628,8 +629,8 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-test = ["pytest"]
 lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
 name = "sphinxcontrib-serializinghtml"
@@ -640,20 +641,20 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-test = ["pytest"]
 lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
 name = "toml"
-version = "0.10.1"
+version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "tqdm"
-version = "4.50.0"
+version = "4.51.0"
 description = "Fast, Extensible Progress Meter"
 category = "dev"
 optional = false
@@ -671,11 +672,11 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.dependencies]
-tqdm = ">=4.14"
 pkginfo = ">=1.4.2"
-requests = ">=2.5.0,<2.15 || >2.15,<2.16 || >2.16"
 readme-renderer = ">=21.0"
+requests = ">=2.5.0,<2.15 || >2.15,<2.16 || >2.16"
 requests-toolbelt = ">=0.8.0,<0.9.0 || >0.9.0"
+tqdm = ">=4.14"
 
 [package.extras]
 keyring = ["keyring"]
@@ -699,7 +700,7 @@ python-versions = "*"
 
 [[package]]
 name = "urllib3"
-version = "1.25.10"
+version = "1.25.11"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "dev"
 optional = false
@@ -707,7 +708,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
 brotli = ["brotlipy (>=0.6.0)"]
-secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "pyOpenSSL (>=0.14)", "ipaddress"]
+secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
 socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
 
 [[package]]
@@ -728,20 +729,20 @@ python-versions = "*"
 
 [[package]]
 name = "yarl"
-version = "1.6.0"
+version = "1.6.2"
 description = "Yet another URL library"
 category = "main"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
-typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
-multidict = ">=4.0"
 idna = ">=2.0"
+multidict = ">=4.0"
+typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "zipp"
-version = "3.2.0"
+version = "3.4.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
 category = "dev"
 optional = false
@@ -758,18 +759,39 @@ content-hash = "399ec0a42f58a9c72b6a23e530d16115b9fb819a3ac08cb5e0c019d228d2d737
 
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 alabaster = [
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@@ -819,13 +841,13 @@ click = [
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 ]
 codecov = [
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 ]
 colorama = [
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@@ -881,8 +903,8 @@ importlib-metadata = [
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@@ -924,31 +946,47 @@ markupsafe = [
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@@ -1102,12 +1146,12 @@ sphinxcontrib-serializinghtml = [
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@@ -1142,8 +1186,8 @@ typing-extensions = [
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 ]
 urllib3 = [
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-    {file = "urllib3-1.25.10.tar.gz", hash = "sha256:91056c15fa70756691db97756772bb1eb9678fa585d9184f24534b100dc60f4a"},
+    {file = "urllib3-1.25.11-py2.py3-none-any.whl", hash = "sha256:f5321fbe4bf3fefa0efd0bfe7fb14e90909eb62a48ccda331726b4319897dd5e"},
+    {file = "urllib3-1.25.11.tar.gz", hash = "sha256:8d7eaa5a82a1cac232164990f04874c594c9453ec55eef02eab885aa02fc17a2"},
 ]
 wcwidth = [
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@@ -1154,25 +1198,41 @@ webencodings = [
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+    {file = "yarl-1.6.2.tar.gz", hash = "sha256:c45b49b59a5724869899798e1bbd447ac486215269511d3b76b4c235a1b766b6"},
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 zipp = [
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+    {file = "zipp-3.4.0-py3-none-any.whl", hash = "sha256:102c24ef8f171fd729d46599845e95c7ab894a4cf45f5de11a44cc7444fb1108"},
+    {file = "zipp-3.4.0.tar.gz", hash = "sha256:ed5eee1974372595f9e416cc7bbeeb12335201d8081ca8a0743c954d4446e5cb"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 441c716..7d00ea4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aiosnow"
-version = "0.5.2"
+version = "0.5.3"
 description = "Asynchronous Python ServiceNow library"
 authors = ["Robert Wikman <rbw@vault13.org>"]
 license = "MIT"
diff --git a/pytest.ini b/pytest.ini
index 088815f..73a031e 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,6 +1,6 @@
 [pytest]
 testpaths = tests
-# addopts = --cov aiosnow
+addopts = --cov aiosnow
 log_level = DEBUG
 log_format = %(asctime)s %(name)s [%(filename)s:%(lineno)d] %(levelname)s: %(message)s
 log_date_format = %Y-%m-%d %H:%M:%S
diff --git a/tests/model/test_model_schema.py b/tests/model/test_model_schema.py
new file mode 100644
index 0000000..5745766
--- /dev/null
+++ b/tests/model/test_model_schema.py
@@ -0,0 +1,86 @@
+import pytest
+
+from aiosnow.exceptions import SchemaError
+from aiosnow.models import ModelSchema, Pluck, fields
+from aiosnow.query.fields import IntegerQueryable, StringQueryable
+
+
+def test_model_schema_field_registration():
+    class TestSchema(ModelSchema):
+        test1 = fields.String()
+        test2 = fields.Integer()
+
+    assert isinstance(TestSchema.test1, StringQueryable)
+    assert isinstance(TestSchema.test2, IntegerQueryable)
+    assert isinstance(TestSchema.fields["test1"], fields.String)
+    assert isinstance(TestSchema.fields["test2"], fields.Integer)
+
+
+def test_model_schema_primary_key():
+    with pytest.raises(SchemaError):
+        type(
+            "TestSchema",
+            (ModelSchema,),
+            dict(
+                test1=fields.String(is_primary=True),
+                test2=fields.Integer(is_primary=True),
+            ),
+        )
+
+
+def test_model_schema_dumps_loads():
+    class MainDocument(ModelSchema):
+        test1 = fields.String()
+        test2 = fields.Integer()
+
+    dict_obj = dict(test1="test", test2=123)
+
+    json_obj = MainDocument().dumps(dict_obj)
+    assert isinstance(json_obj, str)
+
+    loaded = MainDocument().loads(json_obj)
+    assert loaded == dict_obj
+
+
+def test_model_schema_loads():
+    class MainDocument(ModelSchema):
+        test1 = fields.String()
+        test2 = fields.Integer()
+
+    json_obj = """{"test1": "test", "test2": 123}"""
+    dict_obj = dict(test1="test", test2=123)
+
+    assert MainDocument().loads(json_obj) == dict_obj
+
+
+def test_model_schema_nested():
+    class RelatedDocument(ModelSchema):
+        test2 = fields.String()
+        test3 = fields.Integer(pluck=Pluck.VALUE)
+
+    class MainDocument(ModelSchema):
+        test1 = fields.String(pluck=Pluck.DISPLAY_VALUE)
+        related = RelatedDocument
+
+    json_obj = """
+    {
+        "test1": {"value": "test", "display_value": "test2"},
+        "related":
+        {
+            "test2": {"value": "test1", "display_value": "test2"},
+            "test3": {"value": 123, "display_value": "test2"}
+        }
+    }
+    """
+
+    dict_obj = dict(test1="test2", related=dict(test2="test1", test3=123))
+
+    query = MainDocument.related.test2.equals("test123")
+    assert str(query) == "related.test2=test123"
+
+    main = MainDocument()
+    assert main.loads(json_obj) == dict_obj
+
+    related = main.nested_fields["related"].schema
+    assert isinstance(related, RelatedDocument)
+    assert set(related.fields.keys()) == {"test2", "test3"}