import json
import decimal
import datetime


class AlchemyJSONEncoder(json.JSONEncoder):
    def default(self, o):
        d = {}
        for col in o.__table__.columns.keys():
            value = getattr(o, col)
            if hasattr(value, 'isoformat'):
                d[col] = value.isoformat()
            elif isinstance(value, datetime.timedelta):
                d[col] = str(value)
            elif isinstance(value, decimal.Decimal):
                d[col] = float(value)
            else:
                d[col] = value
        return d


class JsonMiddleware:
    def process_response(self, req, resp, resource):
        resp.set_header('Content-Type', 'application/json; charset=utf-8')
        resp.body = json.dumps(resp.body, cls=AlchemyJSONEncoder)

import json
import decimal
import datetime
import sqlalchemy


class AlchemyJSONEncoder(json.JSONEncoder):
    def _is_alchemy_object(self, obj):
        try:
            sqlalchemy.orm.base.object_mapper(obj)
            return True
        except sqlalchemy.orm.exc.UnmappedInstanceError:
            return False

    def default(self, o):
        if self._is_alchemy_object(o):
            d = {}
            for col in o.__table__.columns.keys():
                value = getattr(o, col)
                if hasattr(value, 'isoformat'):
                    d[col] = value.isoformat()
                elif isinstance(value, datetime.timedelta):
                    d[col] = str(value)
                elif isinstance(value, decimal.Decimal):
                    d[col] = float(value)
                else:
                    d[col] = value
            return d
        else:
            return super(AlchemyJSONEncoder, self).default(o)


class JsonMiddleware:
    def process_response(self, req, resp, resource):
        resp.set_header('Content-Type', 'application/json; charset=utf-8')
        resp.body = json.dumps(resp.body, cls=AlchemyJSONEncoder)

--- 
+++ 
@@ -1,33 +1,22 @@
 import json
 import decimal
 import datetime
-import sqlalchemy
 
 
 class AlchemyJSONEncoder(json.JSONEncoder):
-    def _is_alchemy_object(self, obj):
-        try:
-            sqlalchemy.orm.base.object_mapper(obj)
-            return True
-        except sqlalchemy.orm.exc.UnmappedInstanceError:
-            return False
-
     def default(self, o):
-        if self._is_alchemy_object(o):
-            d = {}
-            for col in o.__table__.columns.keys():
-                value = getattr(o, col)
-                if hasattr(value, 'isoformat'):
-                    d[col] = value.isoformat()
-                elif isinstance(value, datetime.timedelta):
-                    d[col] = str(value)
-                elif isinstance(value, decimal.Decimal):
-                    d[col] = float(value)
-                else:
-                    d[col] = value
-            return d
-        else:
-            return super(AlchemyJSONEncoder, self).default(o)
+        d = {}
+        for col in o.__table__.columns.keys():
+            value = getattr(o, col)
+            if hasattr(value, 'isoformat'):
+                d[col] = value.isoformat()
+            elif isinstance(value, datetime.timedelta):
+                d[col] = str(value)
+            elif isinstance(value, decimal.Decimal):
+                d[col] = float(value)
+            else:
+                d[col] = value
+        return d
 
 
 class JsonMiddleware:
Remove dead code from AlchemyJSONEncoder

Signed-off-by: Michal Juranyi <29976087921aeab920eafb9b583221faa738f3f4@vnet.eu>
