first commit

modules/sale_history/sale.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 ModelView, Workflow, fields
+from trytond.pool import PoolMeta
+from trytond.pyson import Eval
+from trytond.tools import grouped_slice, reduce_ids
+from trytond.transaction import Transaction
+
+
+class RevisionMixin:
+    __slots__ = ()
+    revision = fields.Integer(
+        "Revision", required=True, readonly=True,
+        states={
+            'invisible': Eval('revision', 0) == 0,
+            })
+
+    @classmethod
+    def default_revision(cls):
+        return 0
+
+    @property
+    def full_number(self):
+        number = super().full_number
+        if number is not None and self.revision:
+            number += '/%d' % self.revision
+        return number
+
+    @classmethod
+    def copy(cls, records, default=None):
+        default = default.copy() if default is not None else {}
+        default.setdefault('revision', cls.default_revision())
+        return super().copy(records, default=default)
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('draft')
+    def draft(cls, records):
+        cursor = Transaction().connection.cursor()
+        table = cls.__table__()
+
+        # Use SQL and before super to avoid two history entries
+        for sub_records in grouped_slice(records):
+            cursor.execute(*table.update(
+                    [table.revision],
+                    [table.revision + 1],
+                    where=reduce_ids(table.id, sub_records)))
+
+        super().draft(records)
+
+
+class Sale(RevisionMixin, metaclass=PoolMeta):
+    __name__ = 'sale.sale'
+    _history = True
+
+
+class Line(metaclass=PoolMeta):
+    __name__ = 'sale.line'
+    _history = True
+
+
+class LineTax(metaclass=PoolMeta):
+    __name__ = 'sale.line-account.tax'
+    _history = True
+
+
+class Subscription(RevisionMixin, metaclass=PoolMeta):
+    __name__ = 'sale.subscription'
+    _history = True
+
+
+class SubscriptionLine(metaclass=PoolMeta):
+    __name__ = 'sale.subscription.line'
+    _history = True
+
+# TODO: add rental