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Update docs. Split filter_guide_abstract_informations.rst to files per sections.

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Vladimir Botka 2022-01-28 13:45:05 +01:00
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@ -1,734 +1,10 @@
Abstract transformations Abstract transformations
------------------------ ------------------------
Dictionaries .. toctree::
^^^^^^^^^^^^ :maxdepth: 1
You can use the ``dict_kv`` filter to create a single-entry dictionary with ``value | community.general.dict_kv(key)``: filter_guide_abstract_informations_dictionaries
filter_guide_abstract_informations_grouping
.. code-block:: yaml+jinja filter_guide_abstract_informations_merging_lists_of_dictionaries
filter_guide_abstract_informations_counting_elements_in_sequence
- name: Create a single-entry dictionary
debug:
msg: "{{ myvar | community.general.dict_kv('thatsmyvar') }}"
vars:
myvar: myvalue
- name: Create a list of dictionaries where the 'server' field is taken from a list
debug:
msg: >-
{{ myservers | map('community.general.dict_kv', 'server')
| map('combine', common_config) }}
vars:
common_config:
type: host
database: all
myservers:
- server1
- server2
This produces:
.. code-block:: ansible-output
TASK [Create a single-entry dictionary] **************************************************
ok: [localhost] => {
"msg": {
"thatsmyvar": "myvalue"
}
}
TASK [Create a list of dictionaries where the 'server' field is taken from a list] *******
ok: [localhost] => {
"msg": [
{
"database": "all",
"server": "server1",
"type": "host"
},
{
"database": "all",
"server": "server2",
"type": "host"
}
]
}
.. versionadded:: 2.0.0
If you need to convert a list of key-value pairs to a dictionary, you can use the ``dict`` function. Unfortunately, this function cannot be used with ``map``. For this, the ``community.general.dict`` filter can be used:
.. code-block:: yaml+jinja
- name: Create a dictionary with the dict function
debug:
msg: "{{ dict([[1, 2], ['a', 'b']]) }}"
- name: Create a dictionary with the community.general.dict filter
debug:
msg: "{{ [[1, 2], ['a', 'b']] | community.general.dict }}"
- name: Create a list of dictionaries with map and the community.general.dict filter
debug:
msg: >-
{{ values | map('zip', ['k1', 'k2', 'k3'])
| map('map', 'reverse')
| map('community.general.dict') }}
vars:
values:
- - foo
- 23
- a
- - bar
- 42
- b
This produces:
.. code-block:: ansible-output
TASK [Create a dictionary with the dict function] ****************************************
ok: [localhost] => {
"msg": {
"1": 2,
"a": "b"
}
}
TASK [Create a dictionary with the community.general.dict filter] ************************
ok: [localhost] => {
"msg": {
"1": 2,
"a": "b"
}
}
TASK [Create a list of dictionaries with map and the community.general.dict filter] ******
ok: [localhost] => {
"msg": [
{
"k1": "foo",
"k2": 23,
"k3": "a"
},
{
"k1": "bar",
"k2": 42,
"k3": "b"
}
]
}
.. versionadded:: 3.0.0
Grouping
^^^^^^^^
If you have a list of dictionaries, the Jinja2 ``groupby`` filter allows to group the list by an attribute. This results in a list of ``(grouper, list)`` namedtuples, where ``list`` contains all dictionaries where the selected attribute equals ``grouper``. If you know that for every ``grouper``, there will be a most one entry in that list, you can use the ``community.general.groupby_as_dict`` filter to convert the original list into a dictionary which maps ``grouper`` to the corresponding dictionary.
One example is ``ansible_facts.mounts``, which is a list of dictionaries where each has one ``device`` element to indicate the device which is mounted. Therefore, ``ansible_facts.mounts | community.general.groupby_as_dict('device')`` is a dictionary mapping a device to the mount information:
.. code-block:: yaml+jinja
- name: Output mount facts grouped by device name
debug:
var: ansible_facts.mounts | community.general.groupby_as_dict('device')
- name: Output mount facts grouped by mount point
debug:
var: ansible_facts.mounts | community.general.groupby_as_dict('mount')
This produces:
.. code-block:: ansible-output
TASK [Output mount facts grouped by device name] ******************************************
ok: [localhost] => {
"ansible_facts.mounts | community.general.groupby_as_dict('device')": {
"/dev/sda1": {
"block_available": 2000,
"block_size": 4096,
"block_total": 2345,
"block_used": 345,
"device": "/dev/sda1",
"fstype": "ext4",
"inode_available": 500,
"inode_total": 512,
"inode_used": 12,
"mount": "/boot",
"options": "rw,relatime,data=ordered",
"size_available": 56821,
"size_total": 543210,
"uuid": "ab31cade-d9c1-484d-8482-8a4cbee5241a"
},
"/dev/sda2": {
"block_available": 1234,
"block_size": 4096,
"block_total": 12345,
"block_used": 11111,
"device": "/dev/sda2",
"fstype": "ext4",
"inode_available": 1111,
"inode_total": 1234,
"inode_used": 123,
"mount": "/",
"options": "rw,relatime",
"size_available": 42143,
"size_total": 543210,
"uuid": "abcdef01-2345-6789-0abc-def012345678"
}
}
}
TASK [Output mount facts grouped by mount point] ******************************************
ok: [localhost] => {
"ansible_facts.mounts | community.general.groupby_as_dict('mount')": {
"/": {
"block_available": 1234,
"block_size": 4096,
"block_total": 12345,
"block_used": 11111,
"device": "/dev/sda2",
"fstype": "ext4",
"inode_available": 1111,
"inode_total": 1234,
"inode_used": 123,
"mount": "/",
"options": "rw,relatime",
"size_available": 42143,
"size_total": 543210,
"uuid": "bdf50b7d-4859-40af-8665-c637ee7a7808"
},
"/boot": {
"block_available": 2000,
"block_size": 4096,
"block_total": 2345,
"block_used": 345,
"device": "/dev/sda1",
"fstype": "ext4",
"inode_available": 500,
"inode_total": 512,
"inode_used": 12,
"mount": "/boot",
"options": "rw,relatime,data=ordered",
"size_available": 56821,
"size_total": 543210,
"uuid": "ab31cade-d9c1-484d-8482-8a4cbee5241a"
}
}
}
.. versionadded: 3.0.0
Merging lists of dictionaries
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
If you have two or more lists of dictionaries and want to combine them into a list of merged dictionaries, where the dictionaries are merged by an attribute, you can use the ``lists_mergeby`` filter.
.. note:: The output of the examples in this section use the YAML callback plugin. Quoting: "Ansible output that can be quite a bit easier to read than the default JSON formatting." See :ref:`the documentation for the community.general.yaml callback plugin <ansible_collections.community.general.yaml_callback>`.
In the example below the lists are merged by the attribute ``name``:
.. code-block:: yaml+jinja
---
- name: Merge two lists by common attribute 'name'
set_fact:
list3: "{{ list1|
community.general.lists_mergeby(list2, 'name') }}"
vars:
list1:
- name: foo
extra: true
- name: bar
extra: false
- name: meh
extra: true
list2:
- name: foo
path: /foo
- name: baz
path: /baz
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- extra: false
name: bar
- name: baz
path: /baz
- extra: true
name: foo
path: /foo
- extra: true
name: meh
.. versionadded:: 2.0.0
It is possible to use a list of lists as an input of the filter:
.. code-block:: yaml+jinja
---
- name: Merge two lists by common attribute 'name'
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name') }}"
vars:
list1:
- name: foo
extra: true
- name: bar
extra: false
- name: meh
extra: true
list2:
- name: foo
path: /foo
- name: baz
path: /baz
- debug:
var: list3
This produces the same result as in the previous example:
.. code-block:: yaml
list3:
- extra: false
name: bar
- name: baz
path: /baz
- extra: true
name: foo
path: /foo
- extra: true
name: meh
The filter also accepts two optional parameters: ``recursive`` and ``list_merge``. These parameters are only supported when used with ansible-base 2.10 or ansible-core, but not with Ansible 2.9. This is available since community.general 4.4.0.
**recursive**
Is a boolean, default to ``False``. Should the ``community.general.lists_mergeby`` recursively merge nested hashes. Note: It does not depend on the value of the ``hash_behaviour`` setting in ``ansible.cfg``.
**list_merge**
Is a string, its possible values are ``replace`` (default), ``keep``, ``append``, ``prepend``, ``append_rp`` or ``prepend_rp``. It modifies the behaviour of ``community.general.lists_mergeby`` when the hashes to merge contain arrays/lists.
The examples below set ``recursive=true`` and display the differences among all six options of ``list_merge``. Functionality of the parameters is exactly the same as in the filter ``combine``. See :ref:`Combining hashes/dictionaries <combine_filter>` to learn details about these options.
Example ``list_merge=replace`` (default):
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', replace lists (default)
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true) }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- patch_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 3
- 4
- 4
- key: value
Example ``list_merge=keep``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', keep lists
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='keep') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- default_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 1
- 1
- 2
- 3
Example ``list_merge=append``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', append lists
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='append') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- default_value
- patch_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 1
- 1
- 2
- 3
- 3
- 4
- 4
- key: value
Example ``list_merge=prepend``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', prepend lists
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='prepend') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- patch_value
- default_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 3
- 4
- 4
- key: value
- 1
- 1
- 2
- 3
Example ``list_merge=append_rp``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', append lists 'remove present'
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='append_rp') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- default_value
- patch_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 1
- 1
- 2
- 3
- 4
- 4
- key: value
Example ``list_merge=prepend_rp``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', prepend lists 'remove present'
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='prepend_rp') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- patch_value
- default_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 3
- 4
- 4
- key: value
- 1
- 1
- 2
Counting elements in a sequence
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The ``community.general.counter`` filter plugin allows you to count (hashable) elements in a sequence. Elements are returned as dictionary keys and their counts are stored as dictionary values.
.. code-block:: yaml+jinja
- name: Count character occurrences in a string
debug:
msg: "{{ 'abccbaabca' | community.general.counter }}"
- name: Count items in a list
debug:
msg: "{{ ['car', 'car', 'bike', 'plane', 'bike'] | community.general.counter }}"
This produces:
.. code-block:: ansible-output
TASK [Count character occurrences in a string] ********************************************
ok: [localhost] => {
"msg": {
"a": 4,
"b": 3,
"c": 3
}
}
TASK [Count items in a list] **************************************************************
ok: [localhost] => {
"msg": {
"bike": 2,
"car": 2,
"plane": 1
}
}
This plugin is useful for selecting resources based on current allocation:
.. code-block:: yaml+jinja
- name: Get ID of SCSI controller(s) with less than 4 disks attached and choose the one with the least disks
debug:
msg: >-
{{
( disks | dict2items | map(attribute='value.adapter') | list
| community.general.counter | dict2items
| rejectattr('value', '>=', 4) | sort(attribute='value') | first
).key
}}
vars:
disks:
sda:
adapter: scsi_1
sdb:
adapter: scsi_1
sdc:
adapter: scsi_1
sdd:
adapter: scsi_1
sde:
adapter: scsi_2
sdf:
adapter: scsi_3
sdg:
adapter: scsi_3
This produces:
.. code-block:: ansible-output
TASK [Get ID of SCSI controller(s) with less than 4 disks attached and choose the one with the least disks]
ok: [localhost] => {
"msg": "scsi_2"
}
.. versionadded:: 4.3.0

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Counting elements in a sequence
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The ``community.general.counter`` filter plugin allows you to count (hashable) elements in a sequence. Elements are returned as dictionary keys and their counts are stored as dictionary values.
.. code-block:: yaml+jinja
- name: Count character occurrences in a string
debug:
msg: "{{ 'abccbaabca' | community.general.counter }}"
- name: Count items in a list
debug:
msg: "{{ ['car', 'car', 'bike', 'plane', 'bike'] | community.general.counter }}"
This produces:
.. code-block:: ansible-output
TASK [Count character occurrences in a string] ********************************************
ok: [localhost] => {
"msg": {
"a": 4,
"b": 3,
"c": 3
}
}
TASK [Count items in a list] **************************************************************
ok: [localhost] => {
"msg": {
"bike": 2,
"car": 2,
"plane": 1
}
}
This plugin is useful for selecting resources based on current allocation:
.. code-block:: yaml+jinja
- name: Get ID of SCSI controller(s) with less than 4 disks attached and choose the one with the least disks
debug:
msg: >-
{{
( disks | dict2items | map(attribute='value.adapter') | list
| community.general.counter | dict2items
| rejectattr('value', '>=', 4) | sort(attribute='value') | first
).key
}}
vars:
disks:
sda:
adapter: scsi_1
sdb:
adapter: scsi_1
sdc:
adapter: scsi_1
sdd:
adapter: scsi_1
sde:
adapter: scsi_2
sdf:
adapter: scsi_3
sdg:
adapter: scsi_3
This produces:
.. code-block:: ansible-output
TASK [Get ID of SCSI controller(s) with less than 4 disks attached and choose the one with the least disks]
ok: [localhost] => {
"msg": "scsi_2"
}
.. versionadded:: 4.3.0

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Dictionaries
^^^^^^^^^^^^
You can use the ``dict_kv`` filter to create a single-entry dictionary with ``value | community.general.dict_kv(key)``:
.. code-block:: yaml+jinja
- name: Create a single-entry dictionary
debug:
msg: "{{ myvar | community.general.dict_kv('thatsmyvar') }}"
vars:
myvar: myvalue
- name: Create a list of dictionaries where the 'server' field is taken from a list
debug:
msg: >-
{{ myservers | map('community.general.dict_kv', 'server')
| map('combine', common_config) }}
vars:
common_config:
type: host
database: all
myservers:
- server1
- server2
This produces:
.. code-block:: ansible-output
TASK [Create a single-entry dictionary] **************************************************
ok: [localhost] => {
"msg": {
"thatsmyvar": "myvalue"
}
}
TASK [Create a list of dictionaries where the 'server' field is taken from a list] *******
ok: [localhost] => {
"msg": [
{
"database": "all",
"server": "server1",
"type": "host"
},
{
"database": "all",
"server": "server2",
"type": "host"
}
]
}
.. versionadded:: 2.0.0
If you need to convert a list of key-value pairs to a dictionary, you can use the ``dict`` function. Unfortunately, this function cannot be used with ``map``. For this, the ``community.general.dict`` filter can be used:
.. code-block:: yaml+jinja
- name: Create a dictionary with the dict function
debug:
msg: "{{ dict([[1, 2], ['a', 'b']]) }}"
- name: Create a dictionary with the community.general.dict filter
debug:
msg: "{{ [[1, 2], ['a', 'b']] | community.general.dict }}"
- name: Create a list of dictionaries with map and the community.general.dict filter
debug:
msg: >-
{{ values | map('zip', ['k1', 'k2', 'k3'])
| map('map', 'reverse')
| map('community.general.dict') }}
vars:
values:
- - foo
- 23
- a
- - bar
- 42
- b
This produces:
.. code-block:: ansible-output
TASK [Create a dictionary with the dict function] ****************************************
ok: [localhost] => {
"msg": {
"1": 2,
"a": "b"
}
}
TASK [Create a dictionary with the community.general.dict filter] ************************
ok: [localhost] => {
"msg": {
"1": 2,
"a": "b"
}
}
TASK [Create a list of dictionaries with map and the community.general.dict filter] ******
ok: [localhost] => {
"msg": [
{
"k1": "foo",
"k2": 23,
"k3": "a"
},
{
"k1": "bar",
"k2": 42,
"k3": "b"
}
]
}
.. versionadded:: 3.0.0

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Grouping
^^^^^^^^
If you have a list of dictionaries, the Jinja2 ``groupby`` filter allows to group the list by an attribute. This results in a list of ``(grouper, list)`` namedtuples, where ``list`` contains all dictionaries where the selected attribute equals ``grouper``. If you know that for every ``grouper``, there will be a most one entry in that list, you can use the ``community.general.groupby_as_dict`` filter to convert the original list into a dictionary which maps ``grouper`` to the corresponding dictionary.
One example is ``ansible_facts.mounts``, which is a list of dictionaries where each has one ``device`` element to indicate the device which is mounted. Therefore, ``ansible_facts.mounts | community.general.groupby_as_dict('device')`` is a dictionary mapping a device to the mount information:
.. code-block:: yaml+jinja
- name: Output mount facts grouped by device name
debug:
var: ansible_facts.mounts | community.general.groupby_as_dict('device')
- name: Output mount facts grouped by mount point
debug:
var: ansible_facts.mounts | community.general.groupby_as_dict('mount')
This produces:
.. code-block:: ansible-output
TASK [Output mount facts grouped by device name] ******************************************
ok: [localhost] => {
"ansible_facts.mounts | community.general.groupby_as_dict('device')": {
"/dev/sda1": {
"block_available": 2000,
"block_size": 4096,
"block_total": 2345,
"block_used": 345,
"device": "/dev/sda1",
"fstype": "ext4",
"inode_available": 500,
"inode_total": 512,
"inode_used": 12,
"mount": "/boot",
"options": "rw,relatime,data=ordered",
"size_available": 56821,
"size_total": 543210,
"uuid": "ab31cade-d9c1-484d-8482-8a4cbee5241a"
},
"/dev/sda2": {
"block_available": 1234,
"block_size": 4096,
"block_total": 12345,
"block_used": 11111,
"device": "/dev/sda2",
"fstype": "ext4",
"inode_available": 1111,
"inode_total": 1234,
"inode_used": 123,
"mount": "/",
"options": "rw,relatime",
"size_available": 42143,
"size_total": 543210,
"uuid": "abcdef01-2345-6789-0abc-def012345678"
}
}
}
TASK [Output mount facts grouped by mount point] ******************************************
ok: [localhost] => {
"ansible_facts.mounts | community.general.groupby_as_dict('mount')": {
"/": {
"block_available": 1234,
"block_size": 4096,
"block_total": 12345,
"block_used": 11111,
"device": "/dev/sda2",
"fstype": "ext4",
"inode_available": 1111,
"inode_total": 1234,
"inode_used": 123,
"mount": "/",
"options": "rw,relatime",
"size_available": 42143,
"size_total": 543210,
"uuid": "bdf50b7d-4859-40af-8665-c637ee7a7808"
},
"/boot": {
"block_available": 2000,
"block_size": 4096,
"block_total": 2345,
"block_used": 345,
"device": "/dev/sda1",
"fstype": "ext4",
"inode_available": 500,
"inode_total": 512,
"inode_used": 12,
"mount": "/boot",
"options": "rw,relatime,data=ordered",
"size_available": 56821,
"size_total": 543210,
"uuid": "ab31cade-d9c1-484d-8482-8a4cbee5241a"
}
}
}
.. versionadded: 3.0.0

View file

@ -0,0 +1,433 @@
Merging lists of dictionaries
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
If you have two or more lists of dictionaries and want to combine them into a list of merged dictionaries, where the dictionaries are merged by an attribute, you can use the ``lists_mergeby`` filter.
.. note:: The output of the examples in this section use the YAML callback plugin. Quoting: "Ansible output that can be quite a bit easier to read than the default JSON formatting." See :ref:`the documentation for the community.general.yaml callback plugin <ansible_collections.community.general.yaml_callback>`.
In the example below the lists are merged by the attribute ``name``:
.. code-block:: yaml+jinja
---
- name: Merge two lists by common attribute 'name'
set_fact:
list3: "{{ list1|
community.general.lists_mergeby(list2, 'name') }}"
vars:
list1:
- name: foo
extra: true
- name: bar
extra: false
- name: meh
extra: true
list2:
- name: foo
path: /foo
- name: baz
path: /baz
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- extra: false
name: bar
- name: baz
path: /baz
- extra: true
name: foo
path: /foo
- extra: true
name: meh
.. versionadded:: 2.0.0
It is possible to use a list of lists as an input of the filter:
.. code-block:: yaml+jinja
---
- name: Merge two lists by common attribute 'name'
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name') }}"
vars:
list1:
- name: foo
extra: true
- name: bar
extra: false
- name: meh
extra: true
list2:
- name: foo
path: /foo
- name: baz
path: /baz
- debug:
var: list3
This produces the same result as in the previous example:
.. code-block:: yaml
list3:
- extra: false
name: bar
- name: baz
path: /baz
- extra: true
name: foo
path: /foo
- extra: true
name: meh
The filter also accepts two optional parameters: ``recursive`` and ``list_merge``. These parameters are only supported when used with ansible-base 2.10 or ansible-core, but not with Ansible 2.9. This is available since community.general 4.4.0.
**recursive**
Is a boolean, default to ``False``. Should the ``community.general.lists_mergeby`` recursively merge nested hashes. Note: It does not depend on the value of the ``hash_behaviour`` setting in ``ansible.cfg``.
**list_merge**
Is a string, its possible values are ``replace`` (default), ``keep``, ``append``, ``prepend``, ``append_rp`` or ``prepend_rp``. It modifies the behaviour of ``community.general.lists_mergeby`` when the hashes to merge contain arrays/lists.
The examples below set ``recursive=true`` and display the differences among all six options of ``list_merge``. Functionality of the parameters is exactly the same as in the filter ``combine``. See :ref:`Combining hashes/dictionaries <combine_filter>` to learn details about these options.
Example ``list_merge=replace`` (default):
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', replace lists (default)
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true) }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- patch_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 3
- 4
- 4
- key: value
Example ``list_merge=keep``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', keep lists
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='keep') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- default_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 1
- 1
- 2
- 3
Example ``list_merge=append``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', append lists
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='append') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- default_value
- patch_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 1
- 1
- 2
- 3
- 3
- 4
- 4
- key: value
Example ``list_merge=prepend``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', prepend lists
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='prepend') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- patch_value
- default_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 3
- 4
- 4
- key: value
- 1
- 1
- 2
- 3
Example ``list_merge=append_rp``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', append lists 'remove present'
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='append_rp') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- default_value
- patch_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 1
- 1
- 2
- 3
- 4
- 4
- key: value
Example ``list_merge=prepend_rp``:
.. code-block:: yaml+jinja
---
- name: Merge recursive by 'name', prepend lists 'remove present'
set_fact:
list3: "{{ [list1, list2]|
community.general.lists_mergeby('name',
recursive=true,
list_merge='prepend_rp') }}"
vars:
list1:
- name: myname01
param01:
x: default_value
y: default_value
list:
- default_value
- name: myname02
param01: [1, 1, 2, 3]
list2:
- name: myname01
param01:
y: patch_value
z: patch_value
list:
- patch_value
- name: myname02
param01: [3, 4, 4, {key: value}]
- debug:
var: list3
This produces:
.. code-block:: yaml
list3:
- name: myname01
param01:
list:
- patch_value
- default_value
x: default_value
y: patch_value
z: patch_value
- name: myname02
param01:
- 3
- 4
- 4
- key: value
- 1
- 1
- 2