diff --git a/CHANGES.md b/CHANGES.md
index ab8e32b..7027a0e 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,17 @@
 # SQLAlchemy-JSONAPI Changelog
 
+## 4.0.5
+
+*2016-03-20*
+
+* Fixed missing jsonapi_permissions attribute when patching relationships.
+
+## 4.0.4
+
+*2016-02-27*
+
+* Fixed session being flushed error during POST to collection.
+
 ## 4.0.1 - 4.0.3
 
 *2016-01-21*
diff --git a/setup.py b/setup.py
index 5c6bd66..969b08b 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
       requirements.append('enum34')
 
 setup(name='SQLAlchemy-JSONAPI',
-      version='4.0.3',
+      version='4.0.5',
       url='http://github.com/coltonprovias/sqlalchemy-jsonapi',
       license='MIT',
       author='Colton J. Provias',
diff --git a/sqlalchemy_jsonapi/serializer.py b/sqlalchemy_jsonapi/serializer.py
index 5e24c11..d2a002c 100644
--- a/sqlalchemy_jsonapi/serializer.py
+++ b/sqlalchemy_jsonapi/serializer.py
@@ -140,7 +140,7 @@ def __init__(self):
         self.status_code = 200
         self.data = {
             'jsonapi': {'version': '1.0'},
-            'meta': {'sqlalchemy_jsonapi_version': '4.0.3'}
+            'meta': {'sqlalchemy_jsonapi_version': '4.0.5'}
         }
 
 
@@ -152,7 +152,7 @@ def get_permission_test(model, field, permission, instance=None):
     :param field: Name of the field or None for instance/model-wide
     :param permission: Permission to check for
     """
-    return model.__jsonapi_permissions__\
+    return getattr(model, '__jsonapi_permissions__', {})\
         .get(field, {})\
         .get(permission, lambda x: True)
 
@@ -1050,8 +1050,9 @@ def post_collection(self, session, data, api_type):
                     setter = get_attr_desc(resource, key, AttributeActions.SET)
                     setter(resource, data['data']['attributes'][api_key])
 
-            session.add(resource)
-            session.commit()
+                session.add(resource)
+                session.commit()
+
         except IntegrityError as e:
             session.rollback()
             raise ValidationError(str(e.orig))
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..897d72e
--- /dev/null
+++ b/test.py
@@ -0,0 +1,93 @@
+import re
+from collections import OrderedDict
+
+TESTS = {
+    'email == "cj@coltonprovias.com"': 'User.email == "cj@coltonprovias.com"',
+    'email.lower() == "cj@coltonprovias.com"': 'User.email.lower() == "cj@coltonprovias.com"',
+    'email ilike \'cj@%\'': 'User.email.ilike(\'cj@%\')',
+    'published_at!=null': 'User.published_at != None',
+    '(5<score<=10)||published_at!=null': '(5 < User.score <= 10) or published_at != None',
+    'id in [0, 2.3, 4]': 'User.id in [0, 2.3, 4]',
+    'text == "sample == true"': 'User.text == "sample == true"',
+    '-missing == 5': '-User.missing == 5'
+}
+
+STRING = r"(?P<STRING>('([^'\\]*(?:\\.[^'\\]*)*)'" + r'|"([^"\\]*(?:\\.[^"\\]*)*)"))'
+
+REGEX = [STRING,
+    r'(?P<WHITESPACE>\s+)',
+    r'(?P<NAME>\b[a-zA-Z_][a-zA-Z0-9_]*\b)',
+    r'(?P<PAREN_OPEN>\()',
+    r'(?P<PAREN_CLOSE>\))',
+    r'(?P<BRACKET_OPEN>\[)',
+    r'(?P<BRACKET_CLOSE>\])',
+    r'(?P<GT>\>)',
+    r'(?P<LT>\<)',
+    r'(?P<GTE>\>\=)',
+    r'(?P<LTE>\<\=)',
+    r'(?P<OR>(\|\||or))',
+    r'(?P<AND>(\&\&|and))',
+    r'(?P<NOT>(\!|not))',
+    r'(?P<IN>in)',
+    r'(?P<DOT>\.)',
+    r'(?P<COMMA>,)',
+    r'(?P<EQUAL>\=\=)',
+    r'(?P<NOT_EQUAL>\!\=)',
+    r'(?P<ADD>\+)',
+    r'(?P<SUBTRACT>\-)',
+    r'(?P<MULTIPLY>\*)',
+    r'(?P<DIVIDE>\/)',
+    r'(?P<FLOOR>\/\/)',
+    r'(?P<MODULO>\%)',
+    r'(?P<CLARKSON>\*\*)',
+    r'(?P<INTEGER>\d+)',
+    r'(?P<FLOAT>\d+\.\d+)'
+]
+
+###
+# EQ
+# NE
+# LT
+# LE
+# GT
+# GE
+# NEG
+# GETITEM
+# CONCAT
+# LIKE
+# ILIKE
+# IN_
+# NOTIN_
+# NOTLIKE
+# NOTILIKE
+# IS_
+# ISNOT
+# STARTSWITH
+# ENDSWITH
+# CONTAINS
+# MATCH
+# ADD
+# SUBTRACT
+# MULTIPLY
+# DIVIDE
+# MODULUS
+# FLOORDIV
+
+BINARY_OPERATORS = OrderedDict([
+    ['EQ', r'(?P<EQ>\=\=)'],
+    ['NE', r'(?P<NE>\!\=)']
+])
+
+
+compiled = re.compile(r'|'.join(reversed(REGEX)), re.IGNORECASE)
+
+for test, final in TESTS.items():
+    print(test)
+    print(final)
+    finalized = []
+    matched = compiled.finditer(test)
+    prev_key = None
+    for item in matched:
+        key = item.lastgroup
+        value = item.group(0)
+        print('    {:20}:{}'.format(key, value))