From a015a9361b8b5b2e2120398db07134e8978debb5 Mon Sep 17 00:00:00 2001
From: bit4bit <bit4bit@noemail.net>
Date: Thu, 24 Jun 2021 01:28:07 +0000
Subject: [PATCH] fields.Function no requiere getter

FossilOrigin-Name: 47f9b9427ef55c688678001361260e5d00ea53d82977ea13e3414ed04878fb36
---
 facho/model/fields/function.py |  8 +++++++-
 tests/test_model.py            | 14 ++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/facho/model/fields/function.py b/facho/model/fields/function.py
index 34e3195..9ea2ac3 100644
--- a/facho/model/fields/function.py
+++ b/facho/model/fields/function.py
@@ -2,7 +2,7 @@ from .field import Field
 from .model import Model
 
 class Function(Field):
-    def __init__(self, getter, setter=None, field=None):
+    def __init__(self, getter=None, setter=None, field=None):
         self.field = field
         self.getter = getter
         self.setter = setter
@@ -12,6 +12,12 @@ class Function(Field):
             return self
         assert self.name is not None
 
+        if self.getter is None and self.field is None:
+            return None
+
+        if self.getter is None and self.field is not None:
+            return Model(self.field)
+
         if self.field is None:
             return self._call(inst, self.getter, self.name)
         else:
diff --git a/tests/test_model.py b/tests/test_model.py
index fa92e9f..cfcd65c 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -257,4 +257,18 @@ def test_field_function_setter():
     person = Person()
     person.password = 'calculate'
     assert '<Person hash="calculate+2"/>' == person.to_xml()
+
+def test_field_function_only_setter():
+    class Person(facho.model.Model):
+        __name__ = 'Person'
+
+        hash = fields.Attribute('hash')
+        password = fields.Function(setter='set_hash')
+
+        def set_hash(self, name, value):
+            self.hash = "%s+2" % (value)
+
+    person = Person()
+    person.password = 'calculate'
+    assert '<Person hash="calculate+2"/>' == person.to_xml()