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42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (c) 2021, Felix Fontein <felix@fontein.de>
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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from ansible.errors import AnsibleFilterError
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from ansible.module_utils.common._collections_compat import Mapping, Sequence
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def groupby_as_dict(sequence, attribute):
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'''
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Given a sequence of dictionaries and an attribute name, returns a dictionary mapping
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the value of this attribute to the dictionary.
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If multiple dictionaries in the sequence have the same value for this attribute,
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the filter will fail.
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'''
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if not isinstance(sequence, Sequence):
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raise AnsibleFilterError('Input is not a sequence')
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result = dict()
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for list_index, element in enumerate(sequence):
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if not isinstance(element, Mapping):
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raise AnsibleFilterError('Sequence element #{0} is not a mapping'.format(list_index))
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if attribute not in element:
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raise AnsibleFilterError('Attribute not contained in element #{0} of sequence'.format(list_index))
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result_index = element[attribute]
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if result_index in result:
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raise AnsibleFilterError('Multiple sequence entries have attribute value {0!r}'.format(result_index))
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result[result_index] = element
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return result
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class FilterModule(object):
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''' Ansible list filters '''
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def filters(self):
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return {
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'groupby_as_dict': groupby_as_dict,
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}
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