Jinja2 filter list of dicts. native_eval, which is called by NativeTemplate.

Jinja2 filter list of dicts This is not something that can simply be resolved by creating a new tag or filter. Maybe my question was clear, I wanted a way to combine 2 dicts in YAML using a As a sidenote to @Navaneethan 's answer, Jinja2 is able to do "regular" item selections for the list and the dictionary, given we know the key of the dictionary, or the locations of items in the list. 3. Both jinja tests and filters run on on Ansible controller itself, not on the target host. Oct 3, 2019 · I'm new to Jinja2. 0. Apr 26, 2017 · other than that you'd probably have to create a custom filter. Be informed that, Only Ansible 2. Mar 25, 2025 · Grouping . So feed it into first filter to get only first element and then address name property. For more information about the eval context, see :ref:`eval-context` versionadded:: 2. I don't want to loop though the list of dns_records but Sep 9, 2019 · im pulling my hairs trying to do a simple thing (i thought it should be easy) with parsing a yaml and filtering for some key in Ansible. I use regex_search filter, which search pattern in every item and return a match if found or None if there is no match. In addition to the default Jinja template operations there are custom extensions available. So I use Jinja2 for an Ansible task as a template to create a file, I have a dictionary defined in the Default Variable We would like to show you a description here but the site won’t allow us. ) which is passed as Ansible parameter in my task. I tried different tests and filters, but my problem seems to be, to access and check the value. 9 version ( pip install --upgrade Jinja2 ) As dict filtering is tedious and won't be readable, if you could format your pillar to be a list of dicts, like this: Quickbase Pipelines uses Jinja templating to enable dynamic expressions, filters, and access to variables, by providing Python-like expressions while ensuring that the templates are evaluated in a sandbox. In Python, I would do: if table_name in [d['name'] for d in tbls_name]: How can I do this in Jinja? Jun 25, 2017 · I'm pretty new to jinja2 and struggle on a simple problem: I get an list of simple dicts to my template: {"task1": true, "task2": false, } I like to render a list of all task-keys, which have false-value. The idea is to add two lists. def on_list_urls(self, request): url_list = self. May 22, 2017 · You can group expressions in Jinja2, like follows: (list_of_dicts|sort(attribute='key1')|first). filters['str_to_obj'] = jinja_filters. So: {{ Mar 16, 2021 · It is not possible with the core format filter. You will have to use dict2items and items2dict to work around that. Nov 20, 2018 · You're very close to solving it, just need to add another filter: {{ data | selectattr('isweb', 'equalto', true) | map(attribute='app') | list | join(' ') }} If you for example have a list of dicts or objects that represent persons with gender, first_name and last_name attributes and you want to group all users by genders you can do something like the following snippet: Mar 28, 2023 · Jinja is powerful templating language that has two filters that are ideal for extracting data from lists of dictionaries. I think. : ['1', '2'] So far, I've managed to apply the following: {{ bri. Ask Question Asked 9 years, 5 months ago. I'd like to reduce the list or lookup values based on the keys/values of the dictionaries. Jinja2 is treating map applies filters – filters are not yes/no things, they applied to every item of input list and return list of modified items. Asking for help, clarification, or responding to other answers. do. def evalcontextfilter (f): """Decorator for marking eval-context dependent filters. 66. general use the filter lists_mergeby. Is there a way to filter by the value of an item in the nested dictionary? python Mar 15, 2015 · Put this code in your jinja filter file: for convert str to dic object def str_to_obj(str): return eval(str) And write this code in your admin file: app. 1' } - { device: 'spine2', interface: 'GigabitEthernet0/0', ip: '10. Python dicts may not be in the order you want to display them in. &gt;&gt;&gt; import jinja2 &gt;&gt;&gt; e = jinja2. Because, as stated in the Jinja documentation: "Without a doubt you should try to remove as much logic from templates as possible. as arguments to function calls and filters, or just to extend or include a template). Ansible appears to have a "unique" filter that can do this. You can use the Ansible-specific filters documented here to manipulate your data, or use any of the standard filters shipped with Jinja2 - see the list of built-in filters in the official Jinja2 template documentation. May 1, 2023 · To reduce the list of dicts to a list of strings, so you only get a list of the addr fields, you can use the map filter: Filter Jinja list by key existence. Viewed 18k times Apr 14, 2019 · What’s the difference between a Jinja filter and a Django filter? The only difference is Jinja tests are used to evaluate conditions and Jinja filters are used to format or transform values. l = [{ 'a': [ { 'b': 4} ] }, { 'a': [ { 'b': 3} ] }] What I would technically like to do would be to sort using the path ['a'][0]['b'] using the sort filter of jinja2. – Sep 29, 2024 · Rendering a List of Dictionaries in Jinja2. One such function or filter is map. acd. Filter list of dicts by dict key. Then I found another solution using json_query and it's flatten projection ([]): What are filters? In jinja filters are used to modify/manipulate variables. Function: sync _do _reject Aug 20, 2016 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Apr 23, 2023 · selectattr in Ansible selectattr is a filter plugin in Ansible that allows you to select a subset of elements from a list of dictionaries based on the value of a particular attribute. 8. Jinja is a modern and designer-friendly templating language for Python. I did some more testing and you are correct. For your case you can use JMESPath to Sep 20, 2018 · The jinja2 selectattr() and map() filters cannot filter a list of dicts where the filtering key begins with a . in. I came here looking for a solution for this problem in ansible, and used β. Let’s say I want a dict of tuples in my Jan 17, 2023 · I have a list of tables coming from a SQLite database: tbls_name = db_admin. But if you are willing to write a few lines of python, you can easily solve this with a custom filter. Jan 24, 2019 · Jinja2 converts integer-like strings to numbers under the hood. You have correct syntax in general. So on this step I get this list: [null, "apple", "rare", null, null]. 9 (so it's possible you are experiencing behavior they decided was a bug and fixed), but my hypothesis is that the with_items: behavior is re-executing the vars: statement as a side effect of the loop, thus resetting x through every loop, equivalent to: with_items({vars, set_fact}, [{item},{item}]) instead of which is returned in url_list and used by render_template. You can also use Python methods to transform data. However, we recommend you use the Fully Qualified Collection Name (FQCN) ansible. This results in a list of (grouper, list) namedtuples, where list contains all dictionaries where the selected attribute equals grouper. My current problem, I have a list of dicts: vlans: - name: clients1 id: 12 type: clients - name: clients2 id: 13 type: clients - name: server1 id: 20 type: server Jun 26, 2019 · Before looking into Jinja2 nastiness, here the python version. How to apply dictionary to list of items with Jinja filter? 1. I could do this in one line in python. 1. disks into two lists, one containing the size and the other one the friendly name, then apply the human_readable filter to the list containing the size with the map filter, then zip the two lists back together. Mar 16, 2025 · The unique() filter in Jinja is used to remove duplicate entries from a sequence (like a list or tuple). In Django there is no such naming difference and an equivalent Jinja test in Django is simply called a Django filter. Preprocess your data accordingly, and pass items as well as total to the template: Mar 27, 2019 · Your filter_policy variable effectively contains a string which happens to be a json representation of a list of dicts. Modified 4 years, 3 months ago. My yaml file looks like this: --- - vm: "vm1" ip: 10. answered Apr 21 Jinja has (at least?) two different Mar 4, 2019 · I am new with Jinja2 maybe my question is noobie but I can't understand it. I have a Jinja2 dictionary and I want a single expression that modifies it - either by changing its content, or merging with another dictionary. Lists in Jinja are dynamic data structures, which means that you do not need to know the number of variables that your list will represent. Ask Question Asked 7 years, 7 months ago. Less obviously, dot notation can be used to look into dicts of dicts. jinja_env). View Source. This filter plugin is part of ansible-core and included in all Ansible installations. This takes the list of hosts in group ‘x’, looks them up in hostvars, and then looks up the ec2_ip_address of the result. Now we can use the new filter with Jinja2's dictsort filter. Aug 16, 2019 · So the lists of dicts need to be merged, and overwritten if the ‘name’ attribute is the same (if I express myself correctly). I'll not focus on the details here, instead introduce the extension I've used to tackle the problem above; jinja2. 5. Debugging tools and careful handling of Aug 10, 2017 · Jinja Template dict/list filter "contains" or "like" - Saltstack. Dec 5, 2019 · I want to extract the names of all customers when any of the dicts in the list mylst. What do you call a Jinja test in Aug 7, 2015 · You can do list comprehension to convert it to list of dicts. 2. native_eval, which is called by NativeTemplate. Mar 23, 2021 · In what context are you using Jinja2? If you're using it in Python it would be much easier to flatten the lists in Python, and if you're using Ansible, there are filters available that would make this easier as well. Jinja's map() Function. append(key) for content in value Oct 25, 2024 · Use Jinja's map to extract specific values from a list of dictionaries. str_to_obj May 20, 2017 · Filter Jinja list by key existence. 7+ with Jinja2 supports the selectattr for those who are not there yet, you can use ansible json_query. Nov 4, 2024 · Use selectattr to filter a list of dictionaries based on a matching condition. I'm sure it's possible in Jinja, but I just can't figure out how. In this post I will try to give some easy to understand examples of how to use these filters in order to filter lists and dictionaries in your Ansible playbooks. . In part 1 we learned what Jinja2 is, what are its uses, and we started looking at templating basics. The final result is a list of IP addresses for the hosts in group ‘x’. globals. Environment. It helps us to filter and iterate complex datasets and a list of objects. update() as follows:. Follow edited Apr 21, 2017 at 12:20. ext. x)) to apply dict2items to every element of the list. Feb 13, 2022 · Convert the value into a list. Your list will automatically make itself larger if you need to store more items than it currently allows. If no test is specified, the attribute’s value will be evaluated as a boolean. " Nov 19, 2021 · You could split the dictionary ansible_facts. 5 Environment: OS/X Mavericks Summary: Using the jinja2 union filter to combine two lists doesn't work if the two lists contain dictionaries. Something like this: Apr 11, 2024 · Iterating over a Dictionary in a Jinja template; How to access dictionary keys in a Jinja template # Iterating over a list of dictionaries in a Jinja template. Apr 23, 2024 · Jinja built in map filter can get just one attribute for you, so making a list of dicts into just a list. Sep 18, 2021 · One area that I see most people struggling with is using some of the more advanced jinja filters such as select, selectattr and map. Jan 29, 2025 · These Jinja2 filters are invaluable when working with structured data in Ansible playbooks! 📚 Academy – Learn Ansible Today! 🎓 Want to master Ansible automation? List of Jinja filters; Filter examples; Common Jinja examples Use cases & best practices. Let’s take a look at how it Apr 18, 2017 · Reference: jinja Applies a filter on a sequence of objects or looks up an attribute. May 5, 2015 · Learn how to iterate over a list of lists in Jinja2 with examples and solutions from the Stack Overflow community. Oct 19, 2024 · Ok, so leaving function call aside, I really don’t understand the opposition to extending {% with %} (and {% set %} for that matter) syntax to allow declaring common Python iterables (list, dicts, tuples and sets). Mar 6, 2017 · Filter data from list of dicts using condition in Jinja2 filter. For example May 16, 2020 · Welcome to part 2 of my Jinja2 Tutorial. Imagine you have a list of users but you are only interested in a list of usernames: Users on this page: {{ users|map(attribute='username')|join Aug 2, 2018 · Ended up making my own groupby() custom function and passing it into inja2. Jan 24, 2018 · You get list of dicts (single dict) as a result. Right now im using this: Jul 5, 2017 · Here are two approaches. Return the number of items in a container. 42 / 42. Mar 7, 2020 · So, the bad news is that I can't replicate your experience locally with ansible 2. Here's an example: {% set ordered I am attempting to use Jinja2 to get a unique list of slots, i. Share. The simplest data structure available in Jinja is a list. If it was a string the returned list will be a list of characters. Given the task: May 22, 2014 · Issue Type: Bug Report Ansible Version: 1. Its syntax is as follows: <list of dictionaries> | selectattr('<attribute>', '<operator>', '<value>') Get Your Free Linux training! Join our free Linux training … Mar 1, 2020 · I have a list of dictionaries in an ansible variable. items() if value} list filter converts resulting generator . e. Feb 16, 2018 · Jinja kind of supports list map/filter-like operations Make sure your jinja2 is at least 2. I believe a custom jinja2 filter is the correct way to do this. Some dictionaries have the same value in the field 'id and the field 'name' while they differ in other key value pairs (that are not important Mar 16, 2025 · Mastering Jinja's Map() Function: Transforming Sequences with Ease . For example: - name: Convert shell: python -c "print [x for b in {{ servers }}['servers']['results'] for x in b['tagged_instances']]" register: my_list_of_dicts Assuming that {{ servers }} variable holds the entire dictionary (not json). The time required to create that list will be proportional to the number of elements in it. You just have to decode that json string to an effective list of dicts with the from_json filter Feb 4, 2016 · play_hosts is a list of all machines for a play. They are: selectattr() and map(). In most cases, you can use the short plugin name dict2items. 4. The map() function in Jinja is used to apply a filter to each item in a sequence (like a list or tuple) and create a new sequence with the filtered results. The Jinja documentation explains the filters like so: May 14, 2020 · Here are 2 different ways to achieve your requirement. The Playbooks Guide contains information on how to create, use, debug, and optimize your Oct 17, 2024 · I have a list of dicts: vars: sites: - name: "Tampa" site_number: 0 - name: "Miami" site_number: 1 - name: "Daytona" site_number: 2 So im trying to create an HTML table using Jinja2 from a list of dictionaries (as returned by a Flask SQL select statement). (period) character. Coming up next are loops and conditionals, sprinkled with tests and a healthy dose of examples! Playbooks in FortiSOAR allow you to automate your security processes across external systems while respecting the business process required for your organization to function. render(). I want to take these and use something like format() to rewrite them like rabbitmq@%s and then join them together with something like join(). Ask Question Asked 7 years, 10 months ago. Before I set off to create my own filter - is there a way this could still be achieved using native ansible/jinja filters? Thx Is it possible to convert list of primitives to list of dicts using Jinja2 using list/map comprehensions? Given this structure: list: - some_val - some_val_2 Apply map on every element to obtain: list: - statically_added: some_val - statically_added: some_val_2 Sep 8, 2020 · Even without knowing how Jinja2 actually implements the filter map, we can assume that it is actually doing a list comprehension in the background that will return the list of strings found in the "role" field. Right now test_list has stored a list of dictionaries (with the key's being the DB columns). Oct 21, 2020 · There are specific jinja2 filters for that: selectattr and rejectattr. g. xyz. cards|map(attribute='slot')|list }} Which gives me: ['1', '1', '1', '2', '2'] However, I don't seem to be able to find a way to get a unique list. union does not work here, and combine only works for individual dicts, not lists of dicts. Jun 26, 2024 · You can use the map filter (Template Designer Documentation — Jinja Documentation (3. Improve this answer. if all or any of the items from list2 are in list 1 then it's True. evalcontextfilter = True return f Jan 1, 2022 · As Ansible Official documentation claims, All Jinja2 Filters can be used within Ansible. βε's solution first. Here is our article that can help Dec 1, 2016 · map can be used with any filters, Jinja2 doesn't have list comprehension, Ansible / jinja2 list of dicts of lists. lower (s: Sep 7, 2018 · If possible, I would move this logic to the python part of the script before rendering it in Jinja. Expec Contribute to bmsimp/Rewst-Docs development by creating an account on GitHub. groupby(Dict, key=itemgetter(group_filter)): Key_list. The first adapts dasmy's rejectattr-from-list-of-tuples approach to use the dict global function rather than the list filter. Jinja Extensions. Playbooks are the key to empowering your organization with the full benefits of orchestration for both the human and machine side. I went to the simplest for demo, you would probably have to harden the code and fix edge cases for a real life use. If your data items have keys a and b and not 1 and 2, you'd be OK. """ 2 3 import math 4 import random 5 import re 6 import typing 7 import typing as t 8 from collections import abc 9 from itertools import chain 10 from itertools import groupby 11 12 from markupsafe import escape 13 from markupsafe import Markup 14 from markupsafe However, we cannot use the Jinja set method to call update, we must use an extension to Jinja. list of dicts with a list inside that), and I want to do some basic filtering, mapping etc. poc. Transforming data structures in Ansible is straightforward with the right filters. The third argument to the filter can also be a list, for a recursive lookup inside the container: I have a list of topics: list1 = [topic1, topic2, topic3, topic4, topic5, topic6] I would like to check another list against this list: list2 = [topic2, topic4, topic6] something like this: {% if list2. Both lists get passed to the zip filter to pair them off into a unified list (key, value, key2, value2, …). The first solution uses only filters available in ansible by default: rejectattr you already mentionned and its counterpart selectattr. 71. Dumping fvSubnet_ip out indeed results in [ "114. The list of dictionaries structure is more intuitive to render in Jinja2 since each dictionary represents a full item with all attributes. Often I find myself with complex data structures in my Ansible playbook (e. 23: Integers and floating point numbers are created by just writing the number down. An eval context object is passed as first argument. Then you can use map with the first filter to map the list of lists to a list, and map with attribute='key' to get hold of the keys. So '1' and '2' are used to refer the first and the second elements of a list. execute( """SELECT name FROM sqlite_master WHERE type='table';""" ) And need to check if table_name is in the resulting list of dictionaries. Helps in filtering the attributes or in applying other available filters onto the list like replace etc Jinja Filters and Functions Overview. This is useful when dealing with lists of objects but you are really only interested in a certain value of it. import jinja2 import itertools from operator import itemgetter def custom_jinja_groupby(Dict, Key_list, Val_list, group_filter, parse_filter): temp_array = [] for key, value in itertools. Filter data from list of dicts using condition in Jinja2 filter. Internal Rewst Jinja examples; Templates and scripts Feb 16, 2023 · No Jinja2 is in there, filters that are being used and imported and used into the YAML. εηοιτ. Provide details and share your research! But avoid …. If you post this as an answer I will mark it Apr 1, 2019 · However, I will be looping over this list often and would prefer to have Jinja apply the filter in-line in the for loop. Mar 27, 2017 · Thanks. Filtering a dict in Ansible. Ansible. 2. If this behavior is intentional, it should be documented. But those work on a list of dicts, not on a dict itself. Built-in template filters used with the | operator. If unintentional, it should be corrected. Mar 20, 2018 · In my case I have a list of dicts that contains other several list of dicts. Then we have to add this new filter to Jinja2: env. html', url_list = url_list ) the template list_urls is pretty simple - May 12, 2014 · That sort of logic should usually go in the controller, not the template (separating logic from presentation). items in list1 %} where each item from list2 is checked for in list1. builtin. Conclusion. filters['conffilter'] = conffilter where env is the Jinja2 Environment object from your app (e. Viewed 879 times Filter Jinja list by key existence. Syntaxsequence: The variable holding the list or tuple you want to process dictsort() - Jinja dictsort(): Sorting Dictionaries by Keys and Values Jan 7, 2022 · If you can install the collection community. If you have a list of dictionaries, the Jinja2 groupby filter allows to group the list by an attribute. Function: sync _do _map: Applies a filter on a sequence of objects or looks up an attribute. 17/28", "1008:125:0:e56::1/64" ] Jan 20, 2025 · This serialization-deserialization process guarantees the data is treated as a list. Feb 15, 2021 · I would like to use Jinja2 filters to lookup each list item in the dictionary and return the corresponding value, in a list. To iterate over a list of dictionaries in a Jinja template: Pass the list of dictionaries as a variable in the call to template. Use a for loop to iterate over the list. Dec 12, 2013 · I have a Jinja template with a list of dictionaries. Mar 25, 2025 · Then feeding the list from the previous step into the vars lookup to get the list of values. The second approach renders characters that will be interpreted as a dictionary by ast. I don't know any way to disable this behaviour in Jinja2. More compact syntax than chaining multiple map functions. Jan 30, 2020 · I have a use case to filter "waf" IP alone from below yml input (zone: site9. The basic usage is mapping on an attribute. jinja-filters. 2025-03-16. So I returned to a boilerplate without checks: Apr 4, 2021 · How to process dict list like below, any method using jinja or ansible filter or any other way is welcome. In most cases, you can use the short plugin name combine. Mar 25, 2025 · Note. By leveraging Jinja2’s map and list filters, you can easily convert dictionaries into lists for dynamic playbook operations. The expression below gives the same result. jinja_env. Use jinja2 filters to design and manipulate playbook step outputs. combine for easy linking to the plugin documentation and to avoid conflicting with other collections that may have the same filter plugin name. dict2items for easy linking to the plugin documentation and to avoid conflicting with other collections that may have the same filter plugin name. render_template('list_urls. in Flask it's the app. Perfect for pulling out IPs, interfaces, or other attributes within your Jinja templates or Ansible playbooks. # Input data interfaces: - { device: 'spine1', interface: 'GigabitEthernet0/0', ip: '10. Im working with ansible for some time and i love it but still i have problems working with dicts and lists and lists of dicts. Jinja operations are supported in the Playbook Engine and you can also use the Custom Functions and Filters that are documented in this chapter. 4 """ f. Behold the beauty! new_dict = {key:value for key, value in some_dict. For example converting strings from lowercase to uppercase or selecting items from a list. key2 Share. 1. From: test_dict: USA: New York: - Alice - Bob Dallas: - James - Kim UK: London: - Johnson - Charles Leeds: - Clark - Geoge Filter list of dicts by dict key. env has a key Filter data from list of dicts using condition in Jinja2 filter. 1' } - { device: 'spine1', interface: 'GigabitEthernet0/1', ip: '10. list3: "{{ list1|lists_mergeby(list2, 'a') }}" If you're not able to install the collection create a custom filter on your own. Order matters. The * is used to ‘dereference the list’ (a pythonism that works in Jinja), otherwise it would take the list as a single argument. 10 Apr 18, 2017 · As per the documentation: “selectattr() filters a sequence of objects by applying a test to the specified attribute of each object, and only selecting the objects with the test succeeding. Feb 24, 2024 · As Ansible Quotes in their documentation besides the built-in Ansible filters, all JINJA2 filters can be used in Ansible playbooks. get_urls() return self. Using select() Apr 26, 2015 · (Related to Callbacks or hooks, and reusable series of tasks, in Ansible roles): Is there any better way to append to a list or add a key to a dictionary in Ansible than (ab)using a jina2 template Jul 24, 2020 · JMESPath does not have visibility into the jinja2 variables in the same way that the jinja2 filters do, which is why the reference to names doesn't do what you are expecting: JMESPath thinks that is a field on the current-node named names, rather than a reference to that jinja2 variable They are useful whenever you need a string in the template (e. 1 """Built-in template filters used with the ``|`` operator. Dump a list of rows (as dicts, or lists) to CSV format fieldnames: Controls which keys in each dict to include in CSV output. Modified 9 years, 5 months ago. “ Example #1 This blog post does a great job of demonstrating how to use selectattr( ) . The first one is made by selecting all dicts not having the type atttribute. huhnc fushq cpeu zdyt smaxpj ftgsqx zuqf sgei qkyrp atecs kwzplv uhewz zeokom wvcy jtlck