first commit

modules/purchase_history/purchase.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 Purchase(metaclass=PoolMeta):
+    __name__ = 'purchase.purchase'
+    _history = True
+    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, purchases, default=None):
+        if default is None:
+            default = {}
+        else:
+            default = default.copy()
+        default.setdefault('revision', cls.default_revision())
+        return super().copy(purchases, default=default)
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('draft')
+    def draft(cls, purchases):
+        cursor = Transaction().connection.cursor()
+        table = cls.__table__()
+
+        # Use SQL and before super to avoid two history entries
+        for sub_purchases in grouped_slice(purchases):
+            cursor.execute(*table.update(
+                    [table.revision],
+                    [table.revision + 1],
+                    where=reduce_ids(table.id, sub_purchases)))
+
+        super().draft(purchases)
+
+
+class Line(metaclass=PoolMeta):
+    __name__ = 'purchase.line'
+    _history = True
+
+
+class LineTax(metaclass=PoolMeta):
+    __name__ = 'purchase.line-account.tax'
+    _history = True