Get move cost price from lot when to location is a production

#161279

stock.py

@@ -104,3 +104,16 @@ class Move(metaclass=PoolMeta):
     def __setup__(cls):
         super(Move, cls).__setup__()
         cls.lot.context['from_move'] = Eval('id')
+
+    def get_cost_price(self, product_cost_price=None):
+        pool = Pool()
+        Lot = pool.get('stock.lot')
+
+        cost_price = super().get_cost_price(product_cost_price=None)
+
+        if self.lot and self.to_location.type == 'production':
+            with Transaction().set_context(date=self.effective_date):
+                lot = Lot(self.lot.id) # Need to reinstantiate to ensure the context is correct
+                if lot.cost_price is not None:
+                    return lot.cost_price
+        return cost_price

tests/scenario_production_lot_cost.rst

@@ -0,0 +1,132 @@
+====================================
+Stock Lot Number Production Scenario
+====================================
+
+Imports::
+
+    >>> from decimal import Decimal
+
+    >>> from proteus import Model
+    >>> from trytond.tests.tools import activate_modules
+    >>> from trytond.modules.company.tests.tools import (
+    ...     create_company, get_company)
+
+Activate modules::
+
+    >>> config = activate_modules(['stock_lot_cost', 'production'])
+
+    >>> ProductTemplate = Model.get('product.template')
+    >>> Production = Model.get('production')
+    >>> Production = Model.get('production')
+    >>> Sequence = Model.get('ir.sequence')
+    >>> SequenceType = Model.get('ir.sequence.type')
+    >>> UoM = Model.get('product.uom')
+
+Create company::
+
+    >>> _ = create_company()
+    >>> company = get_company()
+
+Create lot sequence::
+
+    >>> sequence_type, = SequenceType.find(
+    ...     [('name', '=', "Stock Lot")], limit=1)
+    >>> sequence = Sequence(name="Lot", sequence_type=sequence_type)
+    >>> sequence.save()
+
+Create product::
+
+    >>> unit, = UoM.find([('name', '=', 'Unit')])
+
+    >>> template = ProductTemplate()
+    >>> template.name = "Product"
+    >>> template.default_uom = unit
+    >>> template.type = 'goods'
+    >>> template.producible = True
+    >>> template.list_price = Decimal('10.0000')
+    >>> template.lot_required = ['storage']
+    >>> template.lot_sequence = sequence
+    >>> template.save()
+    >>> product, = template.products
+
+Get stock locations::
+
+    >>> Location = Model.get('stock.location')
+    >>> warehouse_loc, = Location.find([('code', '=', 'WH')])
+    >>> supplier_loc, = Location.find([('code', '=', 'SUP')])
+    >>> customer_loc, = Location.find([('code', '=', 'CUS')])
+    >>> output_loc, = Location.find([('code', '=', 'OUT')])
+    >>> storage_loc, = Location.find([('code', '=', 'STO')])
+
+Create lot::
+
+    >>> Lot = Model.get('stock.lot')
+    >>> lot = Lot()
+    >>> lot.number = 'LOT'
+    >>> lot.product = product
+    >>> lot.save()
+
+Create supplier moves move::
+
+    >>> Move = Model.get('stock.move')
+    >>> move1_in = Move()
+    >>> move1_in.from_location = supplier_loc
+    >>> move1_in.to_location = storage_loc
+    >>> move1_in.product = product
+    >>> move1_in.company = company
+    >>> move1_in.lot = lot
+    >>> move1_in.quantity = 100
+    >>> move1_in.unit_price = Decimal('1')
+    >>> move1_in.currency = company.currency
+    >>> move1_in.save()
+    >>> move1_in.click('do')
+
+    >>> move2_in = Move()
+    >>> move2_in.from_location = supplier_loc
+    >>> move2_in.to_location = storage_loc
+    >>> move2_in.product = product
+    >>> move2_in.company = company
+    >>> move2_in.lot = lot
+    >>> move2_in.quantity = 100
+    >>> move2_in.unit_price = Decimal('2')
+    >>> move2_in.currency = company.currency
+    >>> move2_in.save()
+    >>> move2_in.click('do')
+
+Check the lot costs::
+
+    >>> lot = Lot(lot.id)
+    >>> lot.cost_price
+    Decimal('1.5000')
+    >>> lot.total_cost
+    Decimal('300.0000')
+
+Make a production::
+
+    >>> production = Production()
+    >>> input = production.inputs.new()
+    >>> input.from_location = production.warehouse.storage_location
+    >>> input.to_location = production.location
+    >>> input.product = product
+    >>> input.quantity = 1
+    >>> input.unit_price = Decimal(0)
+    >>> input.currency = production.company.currency
+    >>> output = production.outputs.new()
+    >>> output.from_location = production.location
+    >>> output.to_location = production.warehouse.storage_location
+    >>> output.product = product
+    >>> output.quantity = 1
+    >>> output.unit_price = Decimal(0)
+    >>> output.currency = production.company.currency
+    >>> production.click('wait')
+
+    >>> production.cost == Decimal('0.0000')
+    True
+
+    >>> input, = production.inputs
+    >>> input.lot = lot
+    >>> input.save()
+
+    >>> production = Production(production.id)
+    >>> production.cost == Decimal('1.5000')
+    True