to_int.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.

	"""Improved function for type conversion to int."""


	def to_int(probably_a_string):
	"""Helper function to convert safely a value to int.

	In case of wrong type returns a value which can be handled by JSONAlchemy.
	It helps in the situation where an integer subfield is optional.

	:param probably_a_string: A value to convert. Doesn't have to be a string.

	:return: The integer value or None in case of error.
	"""
	try:
	return int(probably_a_string)
	except TypeError:
	return None