From 5f5a6182c9973563821a1e765269d316ff49e5aa Mon Sep 17 00:00:00 2001
From: bit4bit <bit4bit@noemail.net>
Date: Fri, 25 Jun 2021 23:55:36 +0000
Subject: [PATCH] se adiciona fields.One2Many

FossilOrigin-Name: 94c1cca50451a46c417d925b27fdd53d8199b8dc58783e600c84179eac666a36
---
 facho/model/fields/__init__.py |  3 ++-
 facho/model/fields/field.py    |  9 +++++++--
 facho/model/fields/one2many.py | 25 +++++++++++++++++++++++++
 tests/test_model.py            | 17 +++++++++++++++++
 4 files changed, 51 insertions(+), 3 deletions(-)
 create mode 100644 facho/model/fields/one2many.py

diff --git a/facho/model/fields/__init__.py b/facho/model/fields/__init__.py
index df6d582..6e9408d 100644
--- a/facho/model/fields/__init__.py
+++ b/facho/model/fields/__init__.py
@@ -1,10 +1,11 @@
 from .attribute import Attribute
 from .many2one import Many2One
+from .one2many import One2Many
 from .function import Function
 from .virtual import Virtual
 from .field import Field
 
-__all__ = [Attribute, Many2One, Virtual, Field]
+__all__ = [Attribute, One2Many, Many2One, Virtual, Field]
 
 def on_change(fields):
     from functools import wraps
diff --git a/facho/model/fields/field.py b/facho/model/fields/field.py
index d340bbc..b3b5e2f 100644
--- a/facho/model/fields/field.py
+++ b/facho/model/fields/field.py
@@ -26,7 +26,7 @@ class Field:
         if callable(call):
             return call(*args)
 
-    def _create_model(self, inst, name=None, model=None):
+    def _create_model(self, inst, name=None, model=None, attribute=None):
         try:
             return inst._fields[self.name]
         except KeyError:
@@ -37,7 +37,12 @@ class Field:
             if name is not None:
                 obj.__name__ = name
             self._set_namespace(obj, self.namespace, inst.__namespace__)
-            inst._fields[self.name] = obj
+
+            if attribute:
+                inst._fields[attribute] = obj
+            else:
+                inst._fields[self.name] = obj
+
             return obj
 
     def _changed_field(self, inst, name, value):
diff --git a/facho/model/fields/one2many.py b/facho/model/fields/one2many.py
new file mode 100644
index 0000000..571f61d
--- /dev/null
+++ b/facho/model/fields/one2many.py
@@ -0,0 +1,25 @@
+from .field import Field
+
+class BoundModel:
+    def __init__(self, creator):
+        self.creator = creator
+
+    def create(self):
+        return self.creator()
+
+class One2Many(Field):
+    def __init__(self, model, name=None, namespace=None, default=None):
+        self.model = model
+        self.field_name = name
+        self.namespace = namespace
+        self.default = default
+        self.count_relations = 0
+        
+    def __get__(self, inst, cls):
+        assert self.name is not None
+        def creator():
+            attribute = '%s_%d' % (self.name, self.count_relations)
+            self.count_relations += 1
+            return self._create_model(inst, name=self.field_name, model=self.model, attribute=attribute)
+
+        return BoundModel(creator)
diff --git a/tests/test_model.py b/tests/test_model.py
index 532c582..4754a3d 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -399,3 +399,20 @@ def test_model_on_change_field_attribute():
     person.hash = 'hola'
     assert '<Person react="hola+4" Hash="hola"/>' == person.to_xml()
 
+def test_model_one2many():
+    class Line(facho.model.Model):
+        __name__ = 'Line'
+
+        quantity = fields.Attribute('quantity')
+        
+    class Invoice(facho.model.Model):
+        __name__ = 'Invoice'
+
+        lines = fields.One2Many(Line)
+
+    invoice = Invoice()
+    line = invoice.lines.create()
+    line.quantity = 3
+    line = invoice.lines.create()
+    line.quantity = 5
+    assert '<Invoice><Line quantity="3"/><Line quantity="5"/></Invoice>' == invoice.to_xml()