[IMP] Decouple the quantity for templates and variants

There are cases where we dot NOT want to simply sum the quantities of all the variants. For example when dealing with manufacturing capacities, we may have to chose between variants because we can't make ALL of them with the same components.
So instead of a simple non-modular implementation, we'll let each module define his own implementation of how to compute the product template's quantity available for sale.

stock_available/__openerp__.py

@@ -20,7 +20,7 @@
 
 {
     'name': 'Stock available to promise',
-    'version': '8.0.2.0.0',
+    'version': '8.0.3.0.0',
     "author": u"Numérigraphe,Odoo Community Association (OCA)",
     'category': 'Warehouse',
     'depends': ['stock'],

stock_available/models/product_product.py

@@ -36,8 +36,11 @@ def _immediately_usable_qty(self):
 
         By default, available to promise = forecasted quantity.
 
-        Must be overridden by another module that actually implement
-        computations."""
+        **Each** sub-module **must** override this method in **both**
+            `product.product` **and** `product.template`, because we can't
+            decide in advance how to compute the template's quantity from the
+            variants.
+        """
         for prod in self:
             prod.immediately_usable_qty = prod.virtual_available
 

stock_available/models/product_template.py

@@ -28,12 +28,17 @@ class ProductTemplate(models.Model):
     @api.multi
     @api.depends('product_variant_ids.immediately_usable_qty')
     def _immediately_usable_qty(self):
-        """Compute the quantity using all the variants"""
+        """No-op implementation of the stock available to promise.
+
+        By default, available to promise = forecasted quantity.
+
+        **Each** sub-module **must** override this method in **both**
+            `product.product` **and** `product.template`, because we can't
+            decide in advance how to compute the template's quantity from the
+            variants.
+        """
         for tmpl in self:
-            tmpl.immediately_usable_qty = sum(
-                v.immediately_usable_qty
-                for v in tmpl.product_variant_ids
-            )
+            tmpl.immediately_usable_qty = tmpl.virtual_available
 
     immediately_usable_qty = fields.Float(
         digits=dp.get_precision('Product Unit of Measure'),

stock_available_immediately/__openerp__.py

@@ -22,7 +22,7 @@
 
 {
     "name": "Ignore planned receptions in quantity available to promise",
-    "version": "8.0.2.0.0",
+    "version": "8.0.2.0.1",
     "depends": ["stock_available"],
     "author": "Camptocamp,Odoo Community Association (OCA)",
     "license": "AGPL-3",

stock_available_immediately/models/__init__.py

@@ -19,3 +19,4 @@
 ##############################################################################
 
 from . import product_product
+from . import product_template

stock_available_immediately/models/product_product.py

@@ -28,7 +28,9 @@ class ProductProduct(models.Model):
     @api.multi
     @api.depends('virtual_available', 'incoming_qty')
     def _immediately_usable_qty(self):
-        """Ignore the incoming goods in the quantity available to promise"""
+        """Ignore the incoming goods in the quantity available to promise
+
+        This is the same implementation as for templates."""
         super(ProductProduct, self)._immediately_usable_qty()
         for prod in self:
             prod.immediately_usable_qty -= prod.incoming_qty

stock_available_immediately/models/product_template.py

@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    This module is copyright (C) 2014 Numérigraphe SARL. All Rights Reserved.
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from openerp import models, api
+
+
+class ProductTemplate(models.Model):
+    _inherit = 'product.template'
+
+    @api.multi
+    @api.depends('virtual_available', 'incoming_qty')
+    def _immediately_usable_qty(self):
+        """Ignore the incoming goods in the quantity available to promise
+
+        This is the same implementation as for variants."""
+        super(ProductTemplate, self)._immediately_usable_qty()
+        for tmpl in self:
+            tmpl.immediately_usable_qty -= tmpl.incoming_qty