access_2015_06_25_id_accARGUMENT_from_zero_to_null.py
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	# -- coding: utf-8 --
	#
	# This file is part of Invenio.
	# Copyright (C) 2015 CERN.
	#
	# Invenio is free software; you can redistribute it and/or
	# modify it under the terms of the GNU General Public License as
	# published by the Free Software Foundation; either version 2 of the
	# License, or (at your option) any later version.
	#
	# Invenio is distributed in the hope that it will be useful, but
	# WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	# General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with Invenio; if not, write to the Free Software Foundation, Inc.,
	# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	"""Replace zero value for id_accARGUMENT with NULL."""

	from invenio.legacy.dbquery import run_sql


	depends_on = [u'access_2015_05_06_accROLE_accACTION_accARGUMENT_id']


	def info():
	"""Info message."""
	return __doc__


	def do_upgrade():
	"""Implement your upgrades here."""
	run_sql("""
	UPDATE "accROLE_accACTION_accARGUMENT"
	SET "id_accARGUMENT" = NULL
	WHERE "id_accARGUMENT" = 0
	""")


	def estimate():
	"""Estimate running time of upgrade in seconds (optional)."""
	total = run_sql("""
	SELECT count(*) FROM "accROLE_accACTION_accARGUMENT"
	WHERE "id_accARGUMENT" = 0
	""")
	return total[0][0] // 1000 + 1


	def pre_upgrade():
	"""Run pre-upgrade checks (optional)."""
	pass


	def post_upgrade():
	"""Run post-upgrade checks (optional)."""
	pass