odoo/addons/stock_account/wizard/stock_valuation_history.py

from openerp import tools
from openerp.osv import fields, osv
from openerp.tools.translate import _

class wizard_valuation_history(osv.osv_memory):

    _name = 'wizard.valuation.history'
    _description = 'Wizard that opens the stock valuation history table'
    _columns = {
        'date': fields.datetime('Date', required=True),
    }

    _defaults = {
        'date': fields.datetime.now,
    }

    def open_table(self, cr, uid, ids, context=None):
        if context is None:
            context = {}
        data = self.read(cr, uid, ids, context=context)[0]
        ctx = context.copy()
        ctx['history_date'] = data['date']
        ctx['group_by'] = ['product_id']
        return {
            'domain': "[('date', '<=', '" + data['date'] + "')]",
            'name': _('Stock Value At Date'),
            'view_type': 'form',
            'view_mode': 'tree',
            'res_model': 'stock.history',
            'type': 'ir.actions.act_window',
            'context': ctx,
        }


class stock_history(osv.osv):
    _name = 'stock.history'
    _auto = False

    def read_group(self, cr, uid, domain, fields, groupby, offset=0, limit=None, context=None, orderby=False):
        res = super(stock_history, self).read_group(cr, uid, domain, fields, groupby, offset=offset, limit=limit, context=context, orderby=orderby)
        if 'inventory_value' in fields:
            for line in res:
                if '__domain' in line:
                    lines = self.search(cr, uid, line['__domain'], context=context)
                    inv_value = 0.0
                    for line2 in self.browse(cr, uid, lines, context=context):
                        inv_value += line2.inventory_value
                    line['inventory_value'] = inv_value
        return res

    def _get_inventory_value(self, cr, uid, ids, name, attr, context=None):
        product_obj = self.pool.get("product.product")
        res = {}
        for line in self.browse(cr, uid, ids, context=context):
            if line.product_id.cost_method == 'real':
                res[line.id] = line.quantity * line.price_unit_on_move
            else:
                res[line.id] = line.quantity * product_obj.get_history_price(cr, uid, line.product_id.id, line.company_id.id, context=context)
        return res

    _columns = {
        'move_id': fields.many2one('stock.move', 'Stock Move', required=True),
        #'quant_id': fields.many2one('stock.quant'),
        'company_id': fields.related('move_id', 'company_id', type='many2one', relation='res.company', string='Company', required=True, select=True),
        'location_id': fields.many2one('stock.location', 'Location', required=True),
        'product_id': fields.many2one('product.product', 'Product', required=True),
        'product_categ_id': fields.many2one('product.category', 'Product Category', required=True),
        'quantity': fields.integer('Quantity'),
        'date': fields.datetime('Operation Date'),
        'price_unit_on_move': fields.float('Value'),
        'cost_method': fields.char('Cost Method'),
        'inventory_value': fields.function(_get_inventory_value, string="Inventory Value", type='float', readonly=True),
    }

    def init(self, cr):
        tools.drop_view_if_exists(cr, 'stock_history')
        cr.execute("""
            CREATE OR REPLACE VIEW stock_history AS (
                SELECT
                    stock_move.id AS id,
                    stock_move.id AS move_id,
                    stock_move.location_dest_id AS location_id,
                    stock_move.product_id AS product_id,
                    product_template.categ_id AS product_categ_id,
                    stock_move.product_qty AS quantity,
                    stock_move.date AS date,
                    ir_property.value_text AS cost_method,
                    stock_move.price_unit as price_unit_on_move
                FROM
                    stock_move
                LEFT JOIN
                    product_product ON product_product.id = stock_move.product_id
                LEFT JOIN
                    product_template ON product_template.id = product_product.product_tmpl_id
                LEFT JOIN
                    ir_property ON (ir_property.name = 'cost_method' and ir_property.res_id = 'product.template,' || product_template.id::text)
                WHERE stock_move.state = 'done'
            )""")