I have a github page, whose _include directory has a file courses.html:
{% assign id = include.lessonID | split: '.' %}
{% assign courseID = id | first %}
{% assign node = site.data.courses | where: "id","1" %}
{% assign node = node[1] %}
{%- if node.id == empty -%}
<h1> EMPTY NODE Warning</h1>
{%- else -%}
<h2> DATA Found! </h2>
ID: {{ node.id }}
{%- endif -%}
<p>CourseID: {{node.id}}</p>
<p>Name: {{ node.name }}</p>
<p>Link: {{ node.permalink }}</p>
{%- for node in site.data.courses -%}
{%- if node.id == 1 -%}
<p>{{ node.name }}</p>
<p>{{ node.permalink }}</p>
{%- endif -%}
{%- endfor -%}
It is being used by a file in _layout called courses.html:
{% include courses.html post=page.lessonInfo.lessonID post=page %}
Finally, there's file lister.md that has the following contents:
---
layout: courses
title: 'Test'
lessonInfo:
lessonID : 1.1
modName: 'Installing RHEL Server'
chapterName: 'Using Essential Tools'
---
# There should be some course list around here!
The output is as follows:
DATA Found!
ID:
CourseID:
Name:
Link:
RHCSA
/rhcsa
So, apparently the node variable isn't empty, but I can't access any of the properties when I'm selecting the right element of the array using where clause.
However, this works when using the second part using if statement in for loop. How do I fix the where clause?!
Edit
The suggestions by #JJJ did solve my problem, but I have a related problem now. I can't replace the constant 1 in the expression where: "id","1" with a variable! I tried the normal where clause (both with and without quotes) which didn't work. So, I tried a where expression, which also doesn't work:
{% assign node = site.data.courses | where: "id",courseID %}
Doesn't work!
{% assign node = site.data.courses | where_exp: "selNode","selNode.id == courseID" %}
Neither does this.
What am I doing wrong and how do I fix it?
Firstly, like in most programming languages, arrays are zero-indexed. node[1] contains the second node, not the first one. You probably meant {% assign node = node[0] %} instead.
Secondly, if node.id == empty isn't how you check if a value exists. Just do unless node or node.size == 0.
Related
I'm using Home Assistant templates, which run on Jinja2 script.
I have a group of entities (states.group.doors) that have attribute battery_level. I want to build an array of entities with battery_level < min_battery level and display as a string separated by commas.
I can't figure out what's wrong with my syntax. Two questions:
Is there just a better way overall to create a list that is filtered for battery_level < min_battery_level rather than building an array like I am?
If not, then there must be something wrong with the way I am building this array. Can someone spot it?
Thanks for the help.
The following code does successfully detect battery_level < 98 and display true if anything meets that criteria, so I'm almost there.
{% set min_battery_level = 98 -%}
{% set ns = namespace(found=false, entities=[]) -%}
{% set entities = [] -%}
{% for entity_id in states.group.doors.attributes.entity_id -%}
{% set parts = entity_id.split('.') -%}
{% if (state_attr(entity_id, 'battery_level') | replace("%","") | int) < min_battery_level -%}
{% set ns.found = true -%}
{% set entities = entities + [entity_id] -%}
{% endif -%}
{% endfor -%}
{{ ns.found }}
{{ entities | join(' ') }}
Welp... kept playing with it and got it working as follows:
{% set min_battery_level = 98 -%}
{% set ns = namespace(found=false, entities = []) -%}
{% for entity_id in states.group.doors.attributes.entity_id -%}
{% set name = state_attr(entity_id, 'friendly_name') | string -%}
{% set battery = state_attr(entity_id, 'battery_level') | replace("%","") | int -%}
{% if (battery) < min_battery_level -%}
{% set ns.found = true -%}
{% set ns.entities = ns.entities + [name+' ('+battery|string+'%)'] -%}
{% endif -%}
{% endfor -%}
{{ ns.found }}
{{ ns.entities | join(', ') }}
I have a data files with different items. Each item have nested tasks. I am trying to loop the nested tasks and present each task by the task type.
YML DATA
- name: Outside
description: Description
tasks:
- type: Food
name: Eat it outside
status: working
- type: Drinks
name: Drink it outside
status: working
- name: Inside
description: Description
tasks:
- type: Food
name: Eat it inside
status: pending
- type: Drinks
name: Drink it inside
status: working
Liquid
{% for item in site.data.info %}
{% assign grouped-tasks-by-type = item.tasks | group_by: "type" %}
{% for task in grouped-tasks-by-type %}
<h2 class="task-type">{{ task.type }}</h2>
<ul>
{% for task in item.tasks %}
{% if task.status == 'working' %}
<li>{{ item.name }}: {{ task.name }}</li>
{% endif %}
{% endfor %}
</ul>
{% endfor %}
{% endfor %}
Expected result (HTML)
<h2 class="task-type">Food</h2>
<ul>
<li>Outside: Eat it outside<li>
</ul>
<h2 class="task-type">Drinks</h2>
<ul>
<li>Outside: Drink it outside<li>
<li>Inside: Drink it inside<li>
</ul>
However, I am getting a full blank result. Is this possible to do with group_by?
I hope my algorithm below serves you well. I was able to achieve your expect end result with the algorithm. I was unable to utilize the group_by in my solution. The sample code contains Liquid comment blocks to explain my thought process.
Testing
I used the minima git repo, with command jekyll s. I placed your YML data in a file with path _data/info.yml in my locally cloned minima git repo. I used post.html as the code sandbox.
You can print out the Liquid variables to the DOM by doing {{ all_food_types | json }} in the code.
Solution
{%- comment -%}
End Goal: Find all the food types for <h2>.
1. Use map: "tasks" to gather all the tasks into a single array.
This will cause the loss of Outside/Inside information for each task
2. Use map: "type" to create a list of food types ("Food", "Drinks")
3. Use uniq to remove duplicate food types from the array
{%- endcomment -%}
{% assign all_food_types = site.data.info | map: "tasks" | map: "type" | uniq %}
{%- comment -%}
End Goal: Loop through all the data looking
for a specific food type (Food, Drinks)
and group them together
{%- endcomment -%}
{% for food_type in all_food_types %}
<h2 class="task-type">{{ food_type }}</h2>
<ul>
{% for item in site.data.info %}
{% for task in item.tasks %}
{% if task.status == 'working' and task.type == food_type %}
<li>{{ item.name }}: {{ task.name }}</li>
{% endif %}
{% endfor %}
{% endfor %}
</ul>
{% endfor %}
An aside, for whatever reason, my liquid ends up using a lot of arrays and for-loops.
I would like to organize a page based on the number of pages that pass a filter.
I have tried to append truthy pages to a collection but it doesn't work.
{% assign homepage_posts = [] %}
{% for my_page in site.pages %}
{% if my_page.homepage %}
{% assign homepage_posts = homepage_posts | concat: [my_page] %}
{% endif %}
{% endfor %}
<h1>size{{homepage_posts.size}}</h1>
<h1>{{homepage_posts}}</h1>
This is not working. Does concat only work with strings?
Jekyll will use Liquid 4 soon. But, for now, no concat.
In your case you can :
Create an empty array (bracket notation doesn't work in liquid) : {% assign homepage_posts = "" | split:"/" %}
{{ homepage_posts | inspect }} --> output : []
And push elements in it :
{% for my_page in site.pages %}
{% if my_page.homepage %}
{% assign homepage_posts = homepage_posts | push: mypage %}
{% endif %}
{% endfor %}
{{ homepage_posts | inspect }}
concat filter only works with arrays and will be available in Jekyll when it upgrades to Liquid 4.*:
concat
Concatenates (combines) an array with another array. The resulting
array contains all the elements of the original arrays. concat will
not remove duplicate entries from the concatenated array unless you
also use the uniq filter.
To filter pages containing a specific attribute (in this case homepage: true) you can use a where filter.
Having a page with front matter:
---
homepage: true
---
Then you can have the pages with the homepage: true attribute like:
{% assign homepages = site.pages | where:"homepage","true" %}
At its most basic level I need to append a partial object path onto an existing object path. In this particular instance I can't use plugins.
Say you have an object path:
{{ site.data.grants.2015.Return.ReturnHeader.ReturnTypeCd }}
Which, of course, can also be referenced as follows:
{% assign var = "ReturnTypeCd" %}
{{ site.data.grants.2015.Return.ReturnHeader[var] }}
How would I go about adding additional levels of nesting to the variable?
{% assign xTest = "Return.ReturnHeader.ReturnTypeCd" %}
{{ site.data.grants.2015[xTest] }}
//does not work
I've played around with both dot and bracket notations and using append as well as capture, but can't seem to find a solution that works.
This works :
Data file is _data/grants.yml
"2015":
Return:
ReturnHeader:
ReturnTypeCd: "Et hop !"
Getting deep target with a "dotted" string :
{% assign dataPath = site.data.grants.2015 %}
{% assign target = "Return.ReturnHeader.ReturnTypeCd" %}
{% comment %} ++++ Transform target string to an array {% endcomment %}
{% assign labels = target | split:"." %}
{% comment %} ++++
Looping in labels array and reassigning dataPath on each loop.
This goes deeper and deeper in the data tree
++++ {% endcomment %}
{% for label in labels %}
<h2>Label : {{ label }}</h2>
{% assign dataPath = dataPath[label] %}
<p>dataPath : {{ dataPath }}</p>
{% endfor %}
I would like to cocatenate a group of ips into a string.
example ip1:2181,ip2:2181,ip3:2181,etc
{% for host in groups['zookeeper'] %}
{{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}
I have the above code, but can't seem to quite figure out how to concatenate into a string.
searching for "Jinja2 concatenate" doesn't give me the info I need.
Updated this answer, because I think I misunderstood your question.
If you want to concatenate the IP's of each host with some string, you can work with the loop controls, to check if you're in the last iteration:
{% for host in groups['zookeeper'] -%}
{{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{%- if not loop.last %}, {% endif -%}
{%- endfor %}
Old answer:
The word you're looking for is join:
{{ hostvars[host]['ansible_eth0']['ipv4']['address'] | join(", ") }}
You can use the 'extract' filter for this (provided you use ansible>=2.1):
{{ groups['zookeeper'] | map('extract', hostvars, ['ansible_eth0', 'ipv4', 'address']) | join(',') }}
More info:
http://docs.ansible.com/ansible/playbooks_filters.html#extracting-values-from-containers
Found a similar solution at https://adamj.eu/tech/2014/10/02/merging-groups-and-hostvars-in-ansible-variables/ .
I did a set_fact using a groups variable as suggested in the post:
- hosts: all
connection: local
tasks:
- set_fact:
fqdn_list: |
{% set comma = joiner(",") %}
{% for item in play_hosts -%}
{{ comma() }}{{ hostvars[item].ansible_default_ipv4.address }}
{%- endfor %}
This relies on joiner, which has the advantage of not having to worry about the last loop conditional. Then with set_fact I can make use of the new string in later tasks.