[IMP] stock_account: value on quant

This commit introduces back the value by location feature dropped in v11.
The feature was dropped because we implement financial fifo, thus the
value by location does not make sense for this cost method.

This commit introduces an estimation of the value by location in fifo.

Task: 1880379

addons/stock_account/__manifest__.py

@@ -31,6 +31,7 @@ Dashboard / Reports for Warehouse Management includes:
         'views/res_config_settings_views.xml',
         'data/product_data.xml',
         'views/product_views.xml',
+        'views/stock_quant_views.xml',
         'views/stock_valuation_layer_views.xml',
     ],
     'test': [

addons/stock_account/models/__init__.py

@@ -10,5 +10,6 @@ from . import stock_inventory
 from . import stock_location
 from . import stock_move_line
 from . import stock_picking
+from . import stock_quant
 from . import stock_valuation_layer
 from . import res_config_settings

addons/stock_account/models/stock_quant.py

@@ -0,0 +1,51 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models
+from odoo.tools.float_utils import float_is_zero
+
+
+class StockQuant(models.Model):
+    _inherit = 'stock.quant'
+
+    value = fields.Monetary('Value', compute='_compute_value', groups='stock.group_stock_manager')
+    currency_id = fields.Many2one(related='product_id.currency_id', groups='stock.group_stock_manager')
+
+    @api.depends('quantity')
+    def _compute_value(self):
+        """ For standard and AVCO valuation, compute the current accounting
+        valuation of the quants by multiplying the quantity by
+        the standard price. Instead for FIFO, use the quantity times the
+        average cost (valuation layers are not manage by location so the
+        average cost is the same for all location and the valuation field is
+        a estimation more than a real value).
+        """
+        for quant in self:
+            if not quant.location_id._should_be_valued() or\
+                    (quant.owner_id and quant.owner_id != quant.company_id.partner_id):
+                quant.value = 0
+                continue
+            if quant.product_id.cost_method == 'fifo':
+                quantity = quant.product_id.quantity_svl
+                if float_is_zero(quantity, precision_rounding=quant.product_id.uom_id.rounding):
+                    quant.value = 0.0
+                    continue
+                average_cost = quant.product_id.value_svl / quantity
+                quant.value = quant.quantity * average_cost
+            else:
+                quant.value = quant.quantity * quant.product_id.standard_price
+
+    @api.model
+    def read_group(self, domain, fields, groupby, offset=0, limit=None, orderby=False, lazy=True):
+        """ This override is done in order for the grouped list view to display the total value of
+        the quants inside a location. This doesn't work out of the box because `value` is a computed
+        field.
+        """
+        if 'value' not in fields:
+            return super(StockQuant, self).read_group(domain, fields, groupby, offset=offset, limit=limit, orderby=orderby, lazy=lazy)
+        res = super(StockQuant, self).read_group(domain, fields, groupby, offset=offset, limit=limit, orderby=orderby, lazy=lazy)
+        for group in res:
+            if group.get('__domain'):
+                quants = self.search(group['__domain'])
+                group['value'] = sum(quant.value for quant in quants)
+        return res

addons/stock_account/views/stock_quant_views.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record model="ir.ui.view" id="view_stock_quant_tree_inherit">
+        <field name="name">stock.quant.tree.inherit</field>
+        <field name="model">stock.quant</field>
+        <field name="inherit_id" ref="stock.view_stock_quant_tree"></field>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='product_uom_id']" position="after">
+                <field name="currency_id" invisible="1"/>
+                <field name="value"/>
+            </xpath>
+        </field>
+    </record>
+
+    <record model="ir.ui.view" id="view_stock_quant_tree_editable_inherit">
+        <field name="name">stock.quant.tree.editable.inherit</field>
+        <field name="model">stock.quant</field>
+        <field name="inherit_id" ref="stock.view_stock_quant_tree_editable"></field>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='product_uom_id']" position="after">
+                <field name="currency_id" invisible="1"/>
+                <field name="value"/>
+            </xpath>
+        </field>
+    </record>
+
+</odoo>