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Update docs lists_mergeby (#8475)

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* Fix #8474. Complete examples and documentation of lists_mergeby

* Fix docs syntax O(_input)

* Update docs.

* Update plugins/filter/lists_mergeby.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/filter/lists_mergeby.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/filter/lists_mergeby.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/filter/lists_mergeby.py

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Co-authored-by: Felix Fontein <felix@fontein.de>
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Vladimir Botka 2024-06-13 07:35:32 +02:00 committed by GitHub
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plugins/filter/lists_mergeby.py
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@ -1,5 +1,5 @@
# -*- coding: utf-8 -*-
# Copyright (c) 2020-2022, Vladimir Botka <vbotka@gmail.com>
# Copyright (c) 2020-2024, Vladimir Botka <vbotka@gmail.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
@ -12,22 +12,32 @@ DOCUMENTATION = '''
version_added: 2.0.0
author: Vladimir Botka (@vbotka)
description:
- Merge two or more lists by attribute O(index). Optional parameters O(recursive) and O(list_merge)
control the merging of the lists in values. The function merge_hash from ansible.utils.vars
is used. To learn details on how to use the parameters O(recursive) and O(list_merge) see
Ansible User's Guide chapter "Using filters to manipulate data" section "Combining
hashes/dictionaries".
- Merge two or more lists by attribute O(index). Optional
parameters O(recursive) and O(list_merge) control the merging of
the nested dictionaries and lists.
- The function C(merge_hash) from C(ansible.utils.vars) is used.
- To learn details on how to use the parameters O(recursive) and
O(list_merge) see Ansible User's Guide chapter "Using filters to
manipulate data" section R(Combining hashes/dictionaries, combine_filter) or the
filter P(ansible.builtin.combine#filter).
positional: another_list, index
options:
_input:
description: A list of dictionaries.
description:
- A list of dictionaries, or a list of lists of dictionaries.
- The required type of the C(elements) is set to C(raw)
because all elements of O(_input) can be either dictionaries
or lists.
type: list
elements: dictionary
elements: raw
required: true
another_list:
description: Another list of dictionaries. This parameter can be specified multiple times.
description:
- Another list of dictionaries, or a list of lists of dictionaries.
- This parameter can be specified multiple times.
type: list
elements: dictionary
elements: raw
index:
description:
- The dictionary key that must be present in every dictionary in every list that is used to
@ -55,40 +65,134 @@ DOCUMENTATION = '''
'''
EXAMPLES = '''
- name: Merge two lists
# Some results below are manually formatted for better readability. The
# dictionaries' keys will be sorted alphabetically in real output.
- name: Example 1. Merge two lists. The results r1 and r2 are the same.
ansible.builtin.debug:
msg: >-
{{ list1 | community.general.lists_mergeby(
list2,
'index',
recursive=True,
list_merge='append'
) }}"
msg: |
r1: {{ r1 }}
r2: {{ r2 }}
vars:
list1:
- index: a
value: 123
- index: b
value: 42
- {index: a, value: 123}
- {index: b, value: 4}
list2:
- index: a
foo: bar
- index: c
foo: baz
# Produces the following list of dictionaries:
# {
# "index": "a",
# "foo": "bar",
# "value": 123
# },
# {
# "index": "b",
# "value": 42
# },
# {
# "index": "c",
# "foo": "baz"
# }
- {index: a, foo: bar}
- {index: c, foo: baz}
r1: "{{ list1 | community.general.lists_mergeby(list2, 'index') }}"
r2: "{{ [list1, list2] | community.general.lists_mergeby('index') }}"
# r1:
# - {index: a, foo: bar, value: 123}
# - {index: b, value: 4}
# - {index: c, foo: baz}
# r2:
# - {index: a, foo: bar, value: 123}
# - {index: b, value: 4}
# - {index: c, foo: baz}
- name: Example 2. Merge three lists
ansible.builtin.debug:
var: r
vars:
list1:
- {index: a, value: 123}
- {index: b, value: 4}
list2:
- {index: a, foo: bar}
- {index: c, foo: baz}
list3:
- {index: d, foo: qux}
r: "{{ [list1, list2, list3] | community.general.lists_mergeby('index') }}"
# r:
# - {index: a, foo: bar, value: 123}
# - {index: b, value: 4}
# - {index: c, foo: baz}
# - {index: d, foo: qux}
- name: Example 3. Merge single list. The result is the same as 2.
ansible.builtin.debug:
var: r
vars:
list1:
- {index: a, value: 123}
- {index: b, value: 4}
- {index: a, foo: bar}
- {index: c, foo: baz}
- {index: d, foo: qux}
r: "{{ [list1, []] | community.general.lists_mergeby('index') }}"
# r:
# - {index: a, foo: bar, value: 123}
# - {index: b, value: 4}
# - {index: c, foo: baz}
# - {index: d, foo: qux}
- name: Example 4. Merge two lists. By default, replace nested lists.
ansible.builtin.debug:
var: r
vars:
list1:
- {index: a, foo: [X1, X2]}
- {index: b, foo: [X1, X2]}
list2:
- {index: a, foo: [Y1, Y2]}
- {index: b, foo: [Y1, Y2]}
r: "{{ [list1, list2] | community.general.lists_mergeby('index') }}"
# r:
# - {index: a, foo: [Y1, Y2]}
# - {index: b, foo: [Y1, Y2]}
- name: Example 5. Merge two lists. Append nested lists.
ansible.builtin.debug:
var: r
vars:
list1:
- {index: a, foo: [X1, X2]}
- {index: b, foo: [X1, X2]}
list2:
- {index: a, foo: [Y1, Y2]}
- {index: b, foo: [Y1, Y2]}
r: "{{ [list1, list2] | community.general.lists_mergeby('index', list_merge='append') }}"
# r:
# - {index: a, foo: [X1, X2, Y1, Y2]}
# - {index: b, foo: [X1, X2, Y1, Y2]}
- name: Example 6. Merge two lists. By default, do not merge nested dictionaries.
ansible.builtin.debug:
var: r
vars:
list1:
- {index: a, foo: {x: 1, y: 2}}
- {index: b, foo: [X1, X2]}
list2:
- {index: a, foo: {y: 3, z: 4}}
- {index: b, foo: [Y1, Y2]}
r: "{{ [list1, list2] | community.general.lists_mergeby('index') }}"
# r:
# - {index: a, foo: {y: 3, z: 4}}
# - {index: b, foo: [Y1, Y2]}
- name: Example 7. Merge two lists. Merge nested dictionaries too.
ansible.builtin.debug:
var: r
vars:
list1:
- {index: a, foo: {x: 1, y: 2}}
- {index: b, foo: [X1, X2]}
list2:
- {index: a, foo: {y: 3, z: 4}}
- {index: b, foo: [Y1, Y2]}
r: "{{ [list1, list2] | community.general.lists_mergeby('index', recursive=true) }}"
# r:
# - {index: a, foo: {x:1, y: 3, z: 4}}
# - {index: b, foo: [Y1, Y2]}
'''
RETURN = '''
@ -108,13 +212,14 @@ from operator import itemgetter
def list_mergeby(x, y, index, recursive=False, list_merge='replace'):
''' Merge 2 lists by attribute 'index'. The function merge_hash from ansible.utils.vars is used.
This function is used by the function lists_mergeby.
'''Merge 2 lists by attribute 'index'. The function 'merge_hash'
from ansible.utils.vars is used. This function is used by the
function lists_mergeby.
'''
d = defaultdict(dict)
for l in (x, y):
for elem in l:
for lst in (x, y):
for elem in lst:
if not isinstance(elem, Mapping):
msg = "Elements of list arguments for lists_mergeby must be dictionaries. %s is %s"
raise AnsibleFilterError(msg % (elem, type(elem)))
@ -124,20 +229,9 @@ def list_mergeby(x, y, index, recursive=False, list_merge='replace'):
def lists_mergeby(*terms, **kwargs):
''' Merge 2 or more lists by attribute 'index'. Optional parameters 'recursive' and 'list_merge'
control the merging of the lists in values. The function merge_hash from ansible.utils.vars
is used. To learn details on how to use the parameters 'recursive' and 'list_merge' see
Ansible User's Guide chapter "Using filters to manipulate data" section "Combining
hashes/dictionaries".
Example:
- debug:
msg: "{{ list1|
community.general.lists_mergeby(list2,
'index',
recursive=True,
list_merge='append')|
list }}"
'''Merge 2 or more lists by attribute 'index'. To learn details
on how to use the parameters 'recursive' and 'list_merge' see
the filter ansible.builtin.combine.
'''
recursive = kwargs.pop('recursive', False)
@ -155,7 +249,7 @@ def lists_mergeby(*terms, **kwargs):
"must be lists. %s is %s")
raise AnsibleFilterError(msg % (sublist, type(sublist)))
if len(sublist) > 0:
if all(isinstance(l, Sequence) for l in sublist):
if all(isinstance(lst, Sequence) for lst in sublist):
for item in sublist:
flat_list.append(item)
else: