How to add items to an existing dictionary in Ansible? - list

Question

I have a dictionary which is loaded by the following play:
- name: Get variables from ../main.yml and save them into dict
include_vars:
file: "../main.yml"
name: dict
"dict" contains the following:
"dict": {
"environments": {
"MYENV": {
"key1": "value1",
"key2": "value2"
},
"MYENV2": {
"key1": "value1",
"key2": "value2"
},
"MYENV3": {
"key1": "value1",
"key2": "value2"
}
}}
Question: How can I loop through this dictionary in Ansible and add a 3rd key "key3" with accompanied value to each entry in "environments"?
The desired situation would be a new_dict which contains the following:
"new_dict": {
"environments": {
"MYENV": {
"key1": "value1",
"key2": "value2",
"key3": "value3"
},
"MYENV2": {
"key1": "value1",
"key2": "value2",
"key3": "value3"
},
"MYENV3": {
"key1": "value1",
"key2": "value2",
"key3": "value3"
}
}}
With "value3" being a string built like "MYENV" + "value1" + "value2".

Answer 1

The decomposition of the directory is needed. Then {key3: value3} is added and the directory is combined again. The tasks below
vars:
add_this:
key3: value3
tasks:
- set_fact: # collect dictionary keys
keys: "{{ dict.environments|
dict2items|
json_query('[].key') }}"
- set_fact: # collect dictionary values and add item
values: "{{ dict.environments|
dict2items|
json_query('[].value')|
map('combine', add_this)|list }}"
- set_fact: # create dict environments
environments: "{{ environments|
default({})|
combine({item.0: item.1}) }}"
loop: "{{ keys|zip(values)|list }}"
- set_fact: # create dictionary new_dict
new_dict: "{{ new_dict|
default({})|
combine({'environments': environments}) }}"
- debug:
var: new_dict
give
"new_dict": {
"environments": {
"MYENV": {
"key1": "value1",
"key2": "value2",
"key3": "value3"
},
"MYENV2": {
"key1": "value1",
"key2": "value2",
"key3": "value3"
},
"MYENV3": {
"key1": "value1",
"key2": "value2",
"key3": "value3"
}
}
}
Given the fact that all values are different, how can I dynamically create "value3" for each of the environments by e.g. appending the values of "key1" and "key2"?
With a couple of filters
$ cat filter_plugins/filter1.py
def custom_1(h):
return {'key3': h.values()}
def dict_merge(x, y, recursive=False):
if recursive:
z = dict(list(x.items()) + list(y.items()))
else:
z = x.copy()
z.update(y)
return z
def dict_keys(d):
return list(d)
class FilterModule(object):
def filters(self):
return {
'custom_1' : custom_1,
'dict_keys' : dict_keys,
'dict_merge' : dict_merge
}
the tasks below
tasks:
- set_fact:
env: "{{ env|default({})|
combine({item: dict.environments[item]|
dict_merge((dict.environments[item]|custom_1), True)
}) }}"
loop: "{{ dict.environments|dict_keys }}"
- set_fact:
new_dict: "{{ {}|combine({'environments': env}) }}"
- debug:
var: new_dict
give
"new_dict": {
"environments": {
"MYENV": {
"key1": "value1",
"key2": "value2",
"key3": [
"value2",
"value1"
]
},
"MYENV2": {
"key1": "value1",
"key2": "value2",
"key3": [
"value2",
"value1"
]
},
"MYENV3": {
"key1": "value1",
"key2": "value2",
"key3": [
"value2",
"value1"
]
}
}
}
Fit the custom_1 filter to your needs.