adding datetime and decimal columns and tests

cqlengine/columns.py

@@ -1,4 +1,5 @@
 #column field types
+from datetime import datetime
 import re
 from uuid import uuid1, uuid4
 
@@ -165,7 +166,17 @@ class DateTime(Column):
     db_type = 'timestamp'
     def __init__(self, **kwargs):
         super(DateTime, self).__init__(**kwargs)
-        raise NotImplementedError
+
+    def to_python(self, value):
+        if isinstance(value, datetime):
+            return value
+        return datetime.fromtimestamp(value)
+
+    def to_database(self, value):
+        value = super(DateTime, self).to_database(value)
+        if not isinstance(value, datetime):
+            raise ValidationError("'{}' is not a datetime object".format(value))
+        return value.strftime('%Y-%m-%d %H:%M:%S')
 
 class UUID(Column):
     """
@@ -216,10 +227,6 @@ class Float(Column):
 
 class Decimal(Column):
     db_type = 'decimal'
-    #TODO: decimal field
-    def __init__(self, **kwargs):
-        super(DateTime, self).__init__(**kwargs)
-        raise NotImplementedError
 
 class Counter(Column):
     #TODO: counter field

cqlengine/models.py

@@ -21,7 +21,9 @@ class BaseModel(object):
     def __init__(self, **values):
         self._values = {}
         for name, column in self._columns.items():
-            value_mngr = column.value_manager(self, column, values.get(name, None))
+            value =  values.get(name, None)
+            if value is not None: value = column.to_python(value)
+            value_mngr = column.value_manager(self, column, value)
             self._values[name] = value_mngr
 
     @classmethod

cqlengine/query.py

@@ -117,9 +117,8 @@ class LessThanOrEqualOperator(QueryOperator):
     cql_symbol = '<='
 
 class QuerySet(object):
-    #TODO: delete empty columns on save
-    #TODO: support specifying columns to exclude or select only
     #TODO: cache results in this instance, but don't copy them on deepcopy
+    #TODO: support multiple iterators
 
     def __init__(self, model):
         super(QuerySet, self).__init__()
@@ -224,7 +223,9 @@ class QuerySet(object):
             with connection_manager() as con:
                 self._cursor = con.execute(self._select_query(), self._where_values())
             self._rowcount = self._cursor.rowcount
-        return self
+            return self
+        else:
+            raise QueryException("QuerySet only supports a single iterator at a time, though this will be fixed shortly")
 
     def __getitem__(self, s):
 

cqlengine/tests/columns/test_validation.py

@@ -1,4 +1,6 @@
 #tests the behavior of the column classes
+from datetime import datetime
+from decimal import Decimal as D
 
 from cqlengine.tests.base import BaseCassEngTestCase
 
@@ -13,4 +15,53 @@ from cqlengine.columns import Boolean
 from cqlengine.columns import Float
 from cqlengine.columns import Decimal
 
+from cqlengine.management import create_column_family, delete_column_family
+from cqlengine.models import Model
+
+class TestDatetime(BaseCassEngTestCase):
+    class DatetimeTest(Model):
+        test_id = Integer(primary_key=True)
+        created_at = DateTime()
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestDatetime, cls).setUpClass()
+        create_column_family(cls.DatetimeTest)
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestDatetime, cls).tearDownClass()
+        delete_column_family(cls.DatetimeTest)
+
+    def test_datetime_io(self):
+        now = datetime.now()
+        dt = self.DatetimeTest.objects.create(test_id=0, created_at=now)
+        dt2 = self.DatetimeTest.objects(test_id=0).first()
+        assert dt2.created_at.timetuple()[:6] == now.timetuple()[:6]
+
+class TestDecimal(BaseCassEngTestCase):
+    class DecimalTest(Model):
+        test_id = Integer(primary_key=True)
+        dec_val = Decimal()
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestDecimal, cls).setUpClass()
+        create_column_family(cls.DecimalTest)
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestDecimal, cls).tearDownClass()
+        delete_column_family(cls.DecimalTest)
+
+    def test_datetime_io(self):
+        dt = self.DecimalTest.objects.create(test_id=0, dec_val=D('0.00'))
+        dt2 = self.DecimalTest.objects(test_id=0).first()
+        assert dt2.dec_val == dt.dec_val
+
+        dt = self.DecimalTest.objects.create(test_id=0, dec_val=5)
+        dt2 = self.DecimalTest.objects(test_id=0).first()
+        assert dt2.dec_val == D('5')
+        
+