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[FIX] account_financial_report: Avoid slow vacuum due to ondelete=cascade

`report_journal_ledger` is auto-vacuumed as any transient model, but has some
ondelete="cascade" constraints that auto-remove subtables when a record is removed,
doing this operation very slow when selecting these sub-records.

Letting default ondelete="set null" would result in same performance bottleneck,
as the select on sub-table is performed the same for setting "null" value on them.

As a solution, and for avoiding a costly index operation, we delete by SQL sub-tables
rows in advance.

A bit of extra logic has been added for avoiding to remove that records if it's not
the turn of vacuum the parent table.
pull/582/head
Pedro M. Baeza 5 years ago
parent
commit
f22cb07c76
  1. 4
      account_financial_report/readme/CONTRIBUTORS.rst
  2. 13
      account_financial_report/report/journal_ledger.py

4
account_financial_report/readme/CONTRIBUTORS.rst

@ -16,6 +16,10 @@
* Mihai Fekete <feketemihai@gmail.com>
* Miquel Raïch <miquel.raich@eficent.com>
* Isaac Gallart <igallart@puntsistemes.com>
* `Tecnativa <https://www.tecnativa.com>`__:
* Pedro M. Baeza
* Sergio Teruel
Much of the work in this module was done at a sprint in Sorrento, Italy in
April 2016.

13
account_financial_report/report/journal_ledger.py

@ -612,6 +612,19 @@ class ReportJournalLedger(models.TransientModel):
def get_html(self, given_context=None):
return self._get_html()
@api.model
def _transient_vacuum(self, force=False):
"""Remove journal ledger subtables first for avoiding a costly
ondelete operation.
"""
# Next 3 lines adapted from super method for mimicking behavior
cls = type(self)
if not force and (cls._transient_check_count < 21):
return True # no vacuum cleaning this time
self.env.cr.execute("DELETE FROM report_journal_ledger_move_line")
self.env.cr.execute("DELETE FROM report_journal_ledger_move")
return super(ReportJournalLedger, self)._transient_vacuum(force=force)
class ReportJournalLedgerJournal(models.TransientModel):

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