Issue #16: Fields custom getters and setters.

Author: boonya

domain_models/__init__.py

@@ -1,3 +1,3 @@
 """Domain models."""
 
-VERSION = '0.0.9'
+VERSION = '0.0.10'

domain_models/fields.py

@@ -16,6 +16,9 @@ def __init__(self, default=None, required=False):
         self.name = None
         self.storage_name = None
 
+        self.setter_fn = None
+        self.getter_fn = None
+
         self.model_cls = None
 
         self.default = default
@@ -60,7 +63,11 @@ def get_value(self, model, default=None):
         if default is not None:
             default = self._converter(default)
 
-        value = getattr(model, self.storage_name)
+        if callable(self.getter_fn):
+            value = self.getter_fn(model)
+        else:
+            value = getattr(model, self.storage_name)
+
         return value if value is not None else default
 
     def set_value(self, model, value):
@@ -75,7 +82,10 @@ def set_value(self, model, value):
         if value is not None:
             value = self._converter(value)
 
-        setattr(model, self.storage_name, value)
+        if callable(self.setter_fn) and value is not None:
+            self.setter_fn(model, value)
+        else:
+            setattr(model, self.storage_name, value)
 
     def get_builtin_type(self, model):
         """Return built-in type representation of Field.
@@ -85,6 +95,14 @@ def get_builtin_type(self, model):
         """
         return self.get_value(model)
 
+    def getter(self, fn):
+        """Set function for implementation custom getter feature."""
+        self.getter_fn = fn
+
+    def setter(self, fn):
+        """Set function for implementation custom setter feature."""
+        self.setter_fn = fn
+
     def _converter(self, value):
         """Convert raw input value of the field.
 

tests/test_models.py

@@ -25,6 +25,19 @@ class Profile(models.DomainModel):
     birth_date = fields.Date()
 
 
+class CustomGetterSetter(models.DomainModel):
+    id = fields.Int()
+    open_id = fields.Int()
+
+    @open_id.getter
+    def _get_oid(self):
+        return self.id << 8
+
+    @open_id.setter
+    def _set_oid(self, value):
+        self.id = value >> 8
+
+
 class BaseModelsTests(unittest.TestCase):
     """Basic model tests."""
 
@@ -893,3 +906,27 @@ def total_amount(self):
         credits = Credit.Collection([Credit(amount=1), Credit(amount=2)])
 
         self.assertEqual(credits.total_amount, 3)
+
+
+class CustomGetterSetterTest(unittest.TestCase):
+    """Test cases for custom getters and setters feature."""
+
+    def test_getter(self):
+        test_model = CustomGetterSetter()
+        test_model.id = 1
+        self.assertEqual(test_model.id, 1)
+        self.assertEqual(test_model.open_id, 256)
+
+        test_model = CustomGetterSetter(id=1)
+        self.assertEqual(test_model.id, 1)
+        self.assertEqual(test_model.open_id, 256)
+
+    def test_setter(self):
+        test_model = CustomGetterSetter()
+        test_model.open_id = 256
+        self.assertEqual(test_model.id, 1)
+        self.assertEqual(test_model.open_id, 256)
+
+        test_model = CustomGetterSetter(open_id=256)
+        self.assertEqual(test_model.id, 1)
+        self.assertEqual(test_model.open_id, 256)