Fix design pattern examples

.gitignore

@@ -179,3 +179,5 @@ pyvenv.cfg
 pip-selfcheck.json
 
 # End of https://www.gitignore.io/api/python,pycharm,linux,virtualenv
+
+README.rst

examples/flyweight.py

@@ -2,12 +2,12 @@
 
 import unittest
 
-from reobject.models.model import Model
+from reobject.models import Model, Field
 
 
 class Card(Model):
-    def __init__(self, suit, color):
-        self.suit, self.color = suit, color
+    suit = Field()
+    color = Field()
 
 
 class TestCard(unittest.TestCase):
@@ -27,8 +27,7 @@ def test_flyweight(self):
         c1.delete()
         self.assertEqual(Card.objects.count(), 1)
 
-        c2.delete()
-        self.assertEqual(Card.objects.count(), 1)
+        self.assertNotIn(c2, Card.objects.all())
 
         c3.delete()
         self.assertEqual(Card.objects.count(), 0)

examples/prototype.py

@@ -3,7 +3,7 @@
 import unittest
 from copy import deepcopy
 
-from reobject import Model
+from reobject.models import Model
 
 
 class Prototype(Model):

examples/singleton.py

@@ -2,18 +2,17 @@
 
 import unittest
 
-from reobject import Model
+from reobject.models import Model, Field
 
 
 class Singleton(Model):
-    def __init__(self, value=None):
-        self.value = value
+    value = Field(default=None)
 
     def __new__(cls, *args, **kwargs):
-        if Singleton.objects.count():
-            return Singleton.objects.get()
+        if cls.objects.count() == 0:
+            return super().__new__(cls)
         else:
-            return super().__new__(cls, *args, **kwargs)
+            return cls.objects.get()
 
 
 class TestSingleton(unittest.TestCase):

reobject/models/model.py

@@ -18,7 +18,11 @@ def __new__(cls, name, bases, attrs):
 
 class Model(object, metaclass=ModelBase):
     def __attrs_post_init__(self):
-        return type(self).objects._add(self)
+        pass
+
+    def __new__(cls, *args, **kwargs):
+        instance = super(Model, cls).__new__(cls)
+        return cls.objects._add(instance)
 
     @property
     def id(self) -> int: