first commit

modules/product_cost_history/__init__.py

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+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.

modules/product_cost_history/locale/bg.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Фабрична цена"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Дата"
+
+#, fuzzy
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Продукт"
+
+#, fuzzy
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/ca.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Preu de cost"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Data"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Producte"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Historial de costos del producte"
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Historial de costos del producte"

modules/product_cost_history/locale/cs.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr ""
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/de.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Einstandspreis"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Datum"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Artikel"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Historie Kostenpreis"
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Artikel Einstandspreis Historie"

modules/product_cost_history/locale/es.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Precio de coste"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Fecha"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Producto"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Historial de costes del producto"
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Historial de costes del producto"

modules/product_cost_history/locale/es_419.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Precio de costo"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr ""
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr ""
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Historial de costos"

modules/product_cost_history/locale/et.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Ostuhind"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Kuupäev"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Toode"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Toote hinna ajalugu"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Toote hinna ajalugu"

modules/product_cost_history/locale/fa.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "ارزش بها"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "تاریخ"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "محصول"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "سوابق هزینه محصول"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "سوابق هزینه محصول"

modules/product_cost_history/locale/fi.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr ""
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/fr.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Prix de revient"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Date"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Produit"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Historique du coût du produit"
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Historique du prix de revient de produit"

modules/product_cost_history/locale/hu.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Beszerzési ár"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Dátum"
+
+#, fuzzy
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Termék"
+
+#, fuzzy
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/id.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Tanggal"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Produk"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr ""
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr ""

modules/product_cost_history/locale/it.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Prezzo di costo"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Data"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Prodotto"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Cronologia del costo del prodotto"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Cronologia del costo del prodotto"

modules/product_cost_history/locale/lo.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+#, fuzzy
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "ລາຄາຄິດໄລ່"
+
+#, fuzzy
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "ວັນທີ:"
+
+#, fuzzy
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "ຜະລິດຕະພັນ"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/lt.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr ""
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/nl.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Kostprijs"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Datum"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Product"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Productkostengeschiedenis"
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Productkostengeschiedenis"

modules/product_cost_history/locale/pl.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Cena fabryczna"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Data"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Produkt"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Historia kosztów produktu"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Historia kosztów produktu"

modules/product_cost_history/locale/pt.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Preço de Custo"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Data"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Produto"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Histórico de Custo do Produto"
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Histórico de Custo do Produto"

modules/product_cost_history/locale/ro.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Cost"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Data"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Produs"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Istoricul costurilor produsului"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Istoricul costurilor produsului"

modules/product_cost_history/locale/ru.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Цена"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Дата"
+
+#, fuzzy
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "ТМЦ"
+
+#, fuzzy
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/sl.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr "Nabavna cena"
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "Datum"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr "Izdelek"
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Zgodovina stroškov izdelka"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Zgodovina stroškov izdelka"

modules/product_cost_history/locale/tr.po

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+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr ""
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/locale/uk.po

@@ -0,0 +1,23 @@
+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr ""
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr ""
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr ""
+
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr ""

modules/product_cost_history/locale/zh_CN.po

@@ -0,0 +1,25 @@
+#
+msgid ""
+msgstr "Content-Type: text/plain; charset=utf-8\n"
+
+msgctxt "field:product.product.cost_history,cost_price:"
+msgid "Cost Price"
+msgstr ""
+
+#, fuzzy
+msgctxt "field:product.product.cost_history,date:"
+msgid "Date"
+msgstr "日期格式"
+
+msgctxt "field:product.product.cost_history,product:"
+msgid "Product"
+msgstr ""
+
+msgctxt "model:ir.action,name:act_product_cost_history_form"
+msgid "Product Cost History"
+msgstr "Product Cost History"
+
+#, fuzzy
+msgctxt "model:product.product.cost_history,string:"
+msgid "Product Cost History"
+msgstr "Product Cost History"

modules/product_cost_history/product.py

@@ -0,0 +1,158 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from sql import Column, Window
+from sql.aggregate import Max
+from sql.conditionals import Coalesce
+from sql.functions import LastValue
+
+from trytond.model import ModelSQL, ModelView, convert_from, fields
+from trytond.modules.product import round_price
+from trytond.pool import Pool, PoolMeta
+from trytond.tools import timezone as tz
+from trytond.transaction import Transaction
+
+
+class Product(metaclass=PoolMeta):
+    __name__ = 'product.product'
+
+    def get_multivalue(self, name, **pattern):
+        pool = Pool()
+        Company = pool.get('company.company')
+        context = Transaction().context
+        if (name == 'cost_price'
+                and context.get('_datetime')
+                and self.type in ['goods', 'assets']):
+            datetime = context['_datetime']
+            company = pattern.get(
+                'company', Transaction().context.get('company'))
+            if company is not None and company >= 0:
+                company = Company(company)
+                if company.timezone:
+                    timezone = tz.ZoneInfo(company.timezone)
+                    try:
+                        datetime = (
+                            datetime.replace(tzinfo=tz.UTC).astimezone(
+                                timezone))
+                    except OverflowError:
+                        pass
+            cost_price = self.get_cost_price_at(datetime.date(), **pattern)
+            if cost_price is not None:
+                return cost_price
+        return super().get_multivalue(name, **pattern)
+
+    def get_cost_price_at(self, date, **pattern):
+        pool = Pool()
+        CostHistory = pool.get('product.product.cost_history')
+        company = pattern.get(
+            'company', Transaction().context.get('company'))
+        with Transaction().set_context(company=company):
+            records = CostHistory.search([
+                    ('date', '<=', date),
+                    ('product', '=', self.id),
+                    ], limit=1, order=[('date', 'DESC')])
+        if records:
+            record, = records
+            return round_price(record.cost_price)
+
+
+class CostPrice(metaclass=PoolMeta):
+    __name__ = 'product.cost_price'
+    _history = True
+
+
+class ProductCostHistory(ModelSQL, ModelView):
+    __name__ = 'product.product.cost_history'
+    product = fields.Many2One('product.product', "Product")
+    date = fields.Date('Date')
+    cost_price = fields.Numeric('Cost Price')
+
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        cls._order.insert(0, ('date', 'DESC'))
+
+    @classmethod
+    def table_query(cls):
+        pool = Pool()
+        Move = pool.get('stock.move')
+        Product = pool.get('product.product')
+        Template = pool.get('product.template')
+        CostPrice = pool.get('product.cost_price')
+        User = pool.get('res.user')
+        move = Move.__table__()
+        product = Product.__table__()
+        template = Template.__table__()
+        history = CostPrice.__table_history__()
+        transaction = Transaction()
+        user = User(transaction.user)
+
+        tables, clause = Move.search_domain([
+                ('cost_price', '!=', None),
+                ('state', '=', 'done'),
+                Product._domain_moves_cost(),
+                ['OR',
+                    Product._domain_in_moves_cost(),
+                    Product._domain_out_moves_cost(),
+                    ],
+                ], tables={
+                None: (move, None),
+                })
+
+        cost_price = Coalesce(move.product_cost_price, move.cost_price)
+        window = Window(
+            [move.effective_date, move.product],
+            frame='ROWS', start=None, end=None,
+            order_by=[move.write_date.asc, move.id.asc])
+        cost_price = LastValue(cost_price, window=window)
+
+        move_history = convert_from(None, tables, type_='INNER').select(
+            (move.id * 2).as_('id'),
+            move.effective_date.as_('date'),
+            move.product.as_('product'),
+            cost_price.as_('cost_price'),
+            where=clause)
+        query = move_history.select(
+            Max(move_history.id).as_('id'),
+            move_history.date.as_('date'),
+            move_history.product.as_('product'),
+            Max(move_history.cost_price).as_('cost_price'),
+            group_by=[move_history.date, move_history.product])
+
+        if user.company:
+            timezone = user.company.timezone
+        else:
+            timezone = None
+        price_datetime = Coalesce(history.write_date, history.create_date)
+        price_date = cls.date.sql_cast(price_datetime, timezone=timezone)
+        window = Window(
+            [price_date, history.product],
+            frame='ROWS', start=None, end=None,
+            order_by=[price_datetime.asc])
+        cost_price = LastValue(history.cost_price, window=window)
+
+        price_history = (history
+            .join(product, condition=history.product == product.id)
+            .join(template, condition=product.template == template.id)
+            .select(
+                (Column(history, '__id') * 2 + 1).as_('id'),
+                price_date.as_('date'),
+                history.product.as_('product'),
+                cost_price.as_('cost_price'),
+                where=~template.type.in_(['goods', 'assets'])
+                & cls._non_moves_clause(history, user)))
+
+        query |= price_history.select(
+            Max(price_history.id).as_('id'),
+            price_history.date.as_('date'),
+            price_history.product.as_('product'),
+            Max(price_history.cost_price).as_('cost_price'),
+            group_by=[price_history.date, price_history.product])
+        return query
+
+    @classmethod
+    def _non_moves_clause(cls, history_table, user):
+        company_id = user.company.id if user.company else None
+        return history_table.company == company_id
+
+    def get_rec_name(self, name):
+        return Pool().get('ir.lang').get().strftime(self.date)

modules/product_cost_history/product.xml

@@ -0,0 +1,43 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<tryton>
+    <data>
+
+        <record model="ir.ui.view" id="product_cost_history_view_tree">
+            <field name="model">product.product.cost_history</field>
+            <field name="type">tree</field>
+            <field name="name">product_cost_history_tree</field>
+        </record>
+
+        <record model="ir.ui.view" id="product_cost_history_view_graph">
+            <field name="model">product.product.cost_history</field>
+            <field name="type">graph</field>
+            <field name="name">product_cost_history_graph</field>
+        </record>
+
+        <record model="ir.action.act_window" id="act_product_cost_history_form">
+            <field name="name">Product Cost History</field>
+            <field name="res_model">product.product.cost_history</field>
+            <field name="domain"
+                eval="[If(Eval('active_ids', []) == [Eval('active_id')], ('product', '=', Eval('active_id')), ('product', 'in', Eval('active_ids')))]"
+                pyson="1"/>
+        </record>
+        <record model="ir.action.act_window.view" id="act_product_cost_history_form_view1">
+            <field name="sequence" eval="10"/>
+            <field name="view" ref="product_cost_history_view_tree"/>
+            <field name="act_window" ref="act_product_cost_history_form"/>
+        </record>
+        <record model="ir.action.act_window.view" id="act_product_cost_history_form_view2">
+            <field name="sequence" eval="20"/>
+            <field name="view" ref="product_cost_history_view_graph"/>
+            <field name="act_window" ref="act_product_cost_history_form"/>
+        </record>
+        <record model="ir.action.keyword"
+            id="act_product_cost_history_keyword1">
+            <field name="keyword">form_relate</field>
+            <field name="model">product.product,-1</field>
+            <field name="action" ref="act_product_cost_history_form"/>
+        </record>
+    </data>
+</tryton>

modules/product_cost_history/tests/__init__.py

@@ -0,0 +1,2 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.

modules/product_cost_history/tests/scenario_product_cost_history.rst

@@ -0,0 +1,160 @@
+====================
+Product Cost History
+====================
+
+Imports::
+
+    >>> import datetime as dt
+    >>> from decimal import Decimal
+
+    >>> from proteus import Model, Wizard
+    >>> from trytond.modules.company.tests.tools import create_company, get_company
+    >>> from trytond.tests.tools import activate_modules, assertEqual
+
+Activate modules::
+
+    >>> config = activate_modules('product_cost_history', create_company)
+
+    >>> Date = Model.get('ir.date')
+
+Setup company::
+
+    >>> company = get_company()
+    >>> company.timezone = 'Europe/Madrid'
+    >>> company.save()
+
+    >>> today = Date.today(config.context)
+    >>> now = dt.datetime.combine(today, dt.time())
+
+Create product::
+
+    >>> ProductUom = Model.get('product.uom')
+    >>> ProductTemplate = Model.get('product.template')
+    >>> Product = Model.get('product.product')
+    >>> unit, = ProductUom.find([('name', '=', 'Unit')])
+
+    >>> template = ProductTemplate()
+    >>> template.name = 'Product'
+    >>> template.default_uom = unit
+    >>> template.type = 'goods'
+    >>> template.list_price = Decimal('200.0000')
+    >>> product, = template.products
+    >>> product.cost_price = Decimal('100.0000')
+    >>> template.save()
+    >>> product, = template.products
+
+Get stock locations::
+
+    >>> Location = Model.get('stock.location')
+    >>> supplier_loc, = Location.find([('code', '=', 'SUP')])
+    >>> storage_loc, = Location.find([('code', '=', 'STO')])
+    >>> customer_loc, = Location.find([('code', '=', 'CUS')])
+
+Cost history is empty::
+
+    >>> ProductCostHistory = Model.get('product.product.cost_history')
+    >>> ProductCostHistory.find([])
+    []
+
+Create some moves at different dates and with different cost::
+
+    >>> StockMove = Model.get('stock.move')
+    >>> product.cost_price = Decimal('100.0000')
+    >>> product.save()
+    >>> StockMove(
+    ...     product=product,
+    ...     quantity=1,
+    ...     from_location=supplier_loc,
+    ...     to_location=storage_loc,
+    ...     unit_price=Decimal('100.0000'),
+    ...     currency=company.currency,
+    ...     effective_date=today - dt.timedelta(days=2)).click('do')
+    >>> modify_cost_price = Wizard('product.modify_cost_price', [product])
+    >>> modify_cost_price.form.cost_price = '90.0000'
+    >>> modify_cost_price.execute('modify')
+    >>> StockMove(
+    ...     product=product,
+    ...     quantity=1,
+    ...     from_location=supplier_loc,
+    ...     to_location=storage_loc,
+    ...     unit_price=Decimal('90.0000'),
+    ...     currency=company.currency,
+    ...     effective_date=today - dt.timedelta(days=1)).click('do')
+    >>> modify_cost_price = Wizard('product.modify_cost_price', [product])
+    >>> modify_cost_price.form.cost_price = '120.0000'
+    >>> modify_cost_price.execute('modify')
+    >>> StockMove(
+    ...     product=product,
+    ...     quantity=1,
+    ...     from_location=supplier_loc,
+    ...     to_location=storage_loc,
+    ...     unit_price=Decimal('120.0000'),
+    ...     currency=company.currency,
+    ...     effective_date=today - dt.timedelta(days=1)).click('do')
+    >>> modify_cost_price = Wizard('product.modify_cost_price', [product])
+    >>> modify_cost_price.form.cost_price = '110.0000'
+    >>> modify_cost_price.execute('modify')
+    >>> StockMove(
+    ...     product=product,
+    ...     quantity=1,
+    ...     from_location=supplier_loc,
+    ...     to_location=storage_loc,
+    ...     unit_price=Decimal('110.0000'),
+    ...     currency=company.currency,
+    ...     effective_date=today).click('do')
+
+
+Check cost history::
+
+    >>> order = [('date', 'ASC')]
+    >>> [c.cost_price for c in ProductCostHistory.find([], order=order)]
+    [Decimal('100.0000'), Decimal('120.0000'), Decimal('110.0000')]
+    >>> assertEqual([c.date for c in ProductCostHistory.find([], order=order)], [
+    ...     today - dt.timedelta(days=2),
+    ...     today - dt.timedelta(days=1),
+    ...     today])
+
+Check cost price history on product::
+
+    >>> product.reload()
+    >>> product.cost_price
+    Decimal('110.0000')
+
+    >>> with config.set_context(_datetime=now - dt.timedelta(days=3)):
+    ...     product = Product(product.id)
+    >>> product.cost_price
+    Decimal('0')
+
+    >>> with config.set_context(_datetime=now - dt.timedelta(days=2)):
+    ...     product = Product(product.id)
+    >>> product.cost_price
+    Decimal('100.0000')
+
+    >>> with config.set_context(_datetime=now - dt.timedelta(days=1)):
+    ...     product = Product(product.id)
+    >>> product.cost_price
+    Decimal('120.0000')
+
+
+Create service::
+
+    >>> template = ProductTemplate()
+    >>> template.name = 'Service'
+    >>> template.default_uom = unit
+    >>> template.type = 'service'
+    >>> template.list_price = Decimal('50.0000')
+    >>> service, = template.products
+    >>> service.cost_price = Decimal('30.0000')
+    >>> template.save()
+    >>> sevice, = template.products
+
+Update cost price::
+
+    >>> service.cost_price += 5
+    >>> service.save()
+
+Check cost history::
+
+    >>> history, = ProductCostHistory.find([('product', '=', service.id)])
+    >>> history.cost_price
+    Decimal('35.0000')

modules/product_cost_history/tests/test_module.py

@@ -0,0 +1,12 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+
+from trytond.tests.test_tryton import ModuleTestCase
+
+
+class ProductCostHistoryTestCase(ModuleTestCase):
+    'Test ProductCostHistory module'
+    module = 'product_cost_history'
+
+
+del ModuleTestCase

modules/product_cost_history/tests/test_scenario.py

@@ -0,0 +1,8 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+
+from trytond.tests.test_tryton import load_doc_tests
+
+
+def load_tests(*args, **kwargs):
+    return load_doc_tests(__name__, __file__, *args, **kwargs)

modules/product_cost_history/tryton.cfg

@@ -0,0 +1,14 @@
+[tryton]
+version=7.8.0
+depends:
+    ir
+    product
+    stock
+xml:
+    product.xml
+
+[register]
+model:
+    product.Product
+    product.CostPrice
+    product.ProductCostHistory

modules/product_cost_history/view/product_cost_history_graph.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<graph type="line">
+    <x>
+        <field name="date"/>
+    </x>
+    <y>
+        <field name="cost_price" fill="1" empty="0"/>
+    </y>
+</graph>

modules/product_cost_history/view/product_cost_history_tree.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<tree>
+    <field name="product"/>
+    <field name="date"/>
+    <field name="cost_price"/>
+</tree>