[MRG] Add module stock_reord_rule to improve the orderpoint rules. It works forecasting the stock needed per product for n days of sales, with the next formula: (( Qty sold in days_stats * (1+forecast_gap)) / days_stats * days_warehouse)

stock_reord_rule/__init__.py

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+# -*- encoding: utf-8 -*-
+##############################################################################
+#
+#    Vehicle management for OpenERP
+#    Copyright (C) 2012 Sergio Corato (<http://www.icstools.it>)
+#
+#    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/>.
+#
+##############################################################################
+
+import stock_reord_rule

stock_reord_rule/__openerp__.py

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+# -*- encoding: utf-8 -*-
+##############################################################################
+#
+#    Improved reordering rules for OpenERP
+#    Copyright (C) 2012 Sergio Corato (<http://www.icstools.it>)
+#
+#    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/>.
+#
+##############################################################################
+
+{
+    'name': 'Improved reordering rules',
+    'version': '0.2',
+    'category': 'Tools',
+    'description': """
+    This module allows to improve reordering rules of stock module.
+    
+    It works forecasting the stock needed per product for n days of sales, with the next formula:
+    (( Qty sold in days_stats * (1+forecast_gap)) / days_stats * days_warehouse)
+    where:
+    - days_stats = days on wich calculate sales stats;
+    - forecast_gap = forecast of increase/decrease on sales (%);
+    - days_warehouse = days of stock to keep in the warehouse.
+
+    Usage:
+    insert days_stats, forecast_gap and days_warehouse vars in product form
+    and create a reordering rule for the same product, without inserting nothing (neither maximum or
+    minimum quantity are required). The cron job will be executed daily and will update the maximum
+    quantity in the reordering rule (you can force it to start changing the date and hour of 
+    execution).
+    This module doesn't need purchase module to work, but it's useful with that module.'""",
+    'author': 'Sergio Corato',
+    'website': 'http://www.icstools.it',
+    'depends': ['procurement','sale',],
+    'demo_xml' : [],
+    'data': ['stock_reord_rule_view.xml','cron_data.xml',],
+    'images': [],
+    'active': False,
+    'installable': True,
+}

stock_reord_rule/cron_data.xml

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+<?xml version="1.0"?>
+<openerp>
+    <data noupdate="1">
+        <record model="ir.cron" id="update_reordering_quantity_cron">
+            <field name="name">Update quantity for reordering rules</field>
+            <field name="interval_number">1</field>
+            <field name="interval_type">days</field>
+            <field name="numbercall">-1</field>
+            <field name="doall" eval="False"></field>
+            <field eval="'stock.warehouse.orderpoint'" name="model"/>
+            <field eval="'_qty_orderpoint_days'" name="function"/>
+            <field eval="'[[],{}]'" name="args"/>
+        </record>
+    </data>
+</openerp>

stock_reord_rule/security/ir.model.access.csv

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+"id","name","model_id:id","group_id:id","perm_read","perm_write","perm_create","perm_unlink"
+

stock_reord_rule/stock_reord_rule.py

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+# -*- encoding: utf-8 -*-
+##############################################################################
+#
+#    Automatic Stock Procurement by days for OpenERP
+#    Copyright (C) 2012 Sergio Corato (<http://www.icstools.it>)
+#
+#    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.osv import orm, fields
+
+class stock_warehouse_orderpoint(orm.Model):
+    _inherit = "stock.warehouse.orderpoint"
+
+    def _qty_orderpoint_days(self, cr, uid, ids, context=None):
+        """Calculate quantity to create warehouse stock for n days of sales.
+        (( Qty sold in days_stats * (1+forecast_gap)) / days_stats * days_warehouse)"""
+
+        obj_product = self.pool.get('product.product')
+        product_ids = tuple(obj_product.search(cr, uid, [], context=context))
+        sql= """SELECT sol.product_id AS product_id, 
+        (sum( product_uos_qty )/pp.days_stats*(1+pp.forecast_gap/100) * pp.days_warehouse) 
+        AS quantity FROM sale_order_line sol JOIN sale_order so ON so.id = sol.order_id 
+        JOIN product_product pp ON pp.id = sol.product_id 
+        JOIN product_template pt ON pt.id = pp.product_tmpl_id
+        WHERE sol.state in ('done','confirmed') AND pt.type = 'product'
+        AND sol.product_id IN %s AND date_order > (date(now()) - pp.days_stats) 
+        GROUP BY sol.product_uom, sol.product_id, pp.days_stats, pp.forecast_gap,
+        pp.days_warehouse;"""
+        cr.execute(sql, (product_ids,))
+        sql_res = cr.fetchall()
+        if sql_res:
+            for val in sql_res:
+                if val:
+                    reord_rules_ids = self.search(cr, uid, [('product_id', '=', val[0])], context=context)
+                    if reord_rules_ids:
+                        self.write(cr, uid, reord_rules_ids, {'product_max_qty': val[1]}, context=context)
+        return True
+
+class product_product(orm.Model):
+    _inherit = "product.product"
+
+    _columns = {
+        'days_warehouse': fields.integer('Days of needed warehouse stock'),
+        'days_stats': fields.integer('Days of sale statistics'),
+        'forecast_gap': fields.float('Expected sales variation (percent +/-)', digits=(6,3)),
+        }

stock_reord_rule/stock_reord_rule_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<openerp>
+    <data>
+
+        <record id="product_normal_form_view_procurement_by_days" model="ir.ui.view">
+            <field name="name">product.normal.form_procurement_by_days</field>
+            <field name="model">product.product</field>
+            <field name="inherit_id" ref="product.product_normal_form_view"/>
+            <field name="arch" type="xml">
+                <group name="procurement" position="after">
+                    <group name="Stock Procurement By Days">
+                    <field name="days_warehouse"/>
+                    <field name="days_stats"/>
+                    <field name="forecast_gap"/>
+                    </group>
+                </group>
+            </field>
+        </record>
+
+    </data>
+</openerp>
+