Add pre_init_hook to add computed columns

Add columns to avoid MemoryError on an existing Odoo instance
with lots of data.

payment_order_ok on account.move is computed from payment_order_ok
on account.payment.mode which are both introduced by this module,
so nothing to compute.
(see AccountMove._compute_payment_order_ok() in models/account_move.py)

partner_bank_id on account.move.line requires payment_order_ok to be True
which it won't be as it's newly introduced - again nothing to compute.
(see AccountMoveLine._compute_partner_bank_id() in models/account_move_line.py)

account_payment_order/__init__.py

@@ -1,3 +1,4 @@
+from .hooks import pre_init_hook
 from . import models
 from . import report
 from . import wizard

account_payment_order/__manifest__.py

@@ -38,4 +38,5 @@
     ],
     "demo": ["demo/payment_demo.xml"],
     "installable": True,
+    "pre_init_hook": "pre_init_hook",
 }

account_payment_order/hooks.py

@@ -0,0 +1,23 @@
+from odoo.tools import sql
+
+
+def pre_init_hook(cr):
+    """Prepare new computed fields.
+
+    Add columns to avoid MemoryError on an existing Odoo instance
+    with lots of data.
+
+    payment_order_ok on account.move is computed from payment_order_ok
+    on account.payment.mode which are both introduced by this module,
+    so nothing to compute.
+    (see AccountMove._compute_payment_order_ok() in models/account_move.py)
+
+    partner_bank_id on account.move.line requires payment_order_ok to be True
+    which it won't be as it's newly introduced - again nothing to compute.
+    (see AccountMoveLine._compute_partner_bank_id() in models/account_move_line.py)
+    """
+    if not sql.column_exists(cr, "account_move", "payment_order_ok"):
+        sql.create_column(cr, "account_move", "payment_order_ok", "bool")
+
+    if not sql.column_exists(cr, "account_move_line", "partner_bank_id"):
+        sql.create_column(cr, "account_move_line", "partner_bank_id", "int4")