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modules/production_work/routing.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.
+from trytond.model import fields
+from trytond.pool import Pool, PoolMeta
+
+
+class Operation(metaclass=PoolMeta):
+    __name__ = 'production.routing.operation'
+    work_center_category = fields.Many2One('production.work.center.category',
+        'Work Center Category')
+
+
+class RoutingStep(metaclass=PoolMeta):
+    __name__ = 'production.routing.step'
+
+    def get_work(self, production, work_center_picker):
+        "Return work instance for the production using the work center picker"
+        pool = Pool()
+        Work = pool.get('production.work')
+
+        work = Work()
+        work.sequence = self.sequence
+        work.operation = self.operation
+        work.production = production
+        work.company = production.company
+        if self.operation.work_center_category:
+            work.work_center = work_center_picker(
+                production.work_center, self.operation.work_center_category)
+        else:
+            work.work_center = production.work_center
+        return work