[FIX] membership: Assign on pre + save old column

Due to the FK, we can't do the reassignation on post-migration, and we should keep
all column and recreate a new one for avoiding extra FK constraints and for keeping
data for any later audit.

Author: pedrobaeza

addons/membership/migrations/13.0.1.0/post-migration.py

@@ -0,0 +1,34 @@
+# Copyright 2020 ForgeFlow <http://www.forgeflow.com>
+# Copyright 2020 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from psycopg2 import sql
+from openupgradelib import openupgrade
+
+
+def update_invoice_line_relation(env):
+    column = "account_invoice_line"
+    openupgrade.rename_columns(
+        env.cr, {"membership_membership_line": [(column, None)]}
+    )
+    openupgrade.logged_query(
+        env.cr,
+        sql.SQL("ALTER TABLE membership_membership_line ADD {} INT4").format(
+            sql.Identifier(column)
+        )
+    )
+    openupgrade.logged_query(
+        env.cr, sql.SQL(
+            """UPDATE membership_membership_line mml
+            SET account_invoice_line = aml.id
+            FROM account_invoice_line ail
+            JOIN account_move_line aml ON aml.old_invoice_line_id = ail.id
+            WHERE mml.{} = ail.id"""
+        ).format(
+            sql.Identifier(openupgrade.get_legacy_name(column))
+        ),
+    )
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    update_invoice_line_relation(env)