This question already has an answer here:
Pushing items to a var while looping over another var in Ansible Jinja2 template
(1 answer)
Closed 4 years ago.
I'm trying to calculate the needed space based on the longest word in a dictionary.
It seems though that the variable num doesn't transfer it's value to the second inner loop.
I'm basically trying to caculate the amount of spaces to align the columns correctly.
{% for module in modules %}
module "{{ module.name }}" {
source = "{{ module.source }}"
{% set num = 1 %}
{% for n in module.vars.keys() %}
{% if num < n|length %}
{% set num = n|length %}
{% endif %}
{{ num }}: {{ n }}
{% endfor %}
{% for m in module.vars %}
{{ num }}
{{ m }} {{ '= "' + module.vars[m]|indent(width=num) }}"
{% endfor %}
}
You're right, you can't get variables out of loops this way. See "Scoping behavior" in the docs.
One option is to use what they suggest and create a namespace:
{% set ns = namespace(num=0) %}
{% for n in module.vars.keys() %}
{% if ns.num < n|length %}
{% set ns.num = n|length %}
{% endif %}
{{ ns.num }}: {{ n }}
{% endfor %}
In your case, there is an easier and cleaner solution though: you can calculate the maximum width in an expression. Use map() to get a list of lengths, and use max filter to get the biggest one:
{% set indent_width = module.vars.keys() | map("length") | max %}
{% for m in module.vars %}
{{ m }} {{ '= "' + module.vars[m]|indent(width=indent_width) }}"
{% endfor %}
Related
I want to use the n values in the next for statement and I expect output as router_0, router_1. But any optisons like router_[n], router_{{ n }}, router_(n) etc didnt work. How can we do this?
{% for n in range(0, 2) %}
{% for rtr in web.router_[n] %}
{% if rtr.interface.type == 'lacp' %}
interface Port-Channel{{ rtr.interface.id }}
.
{% endif %}
{% endfor %}
{% endfor %}
In vars.yaml, there are variables for paired routers, router_0 and router_1. I want to generate the config template for both routers at the same time.
Thanks,
Concatenate the name of the attribute
{% for rtr in web['router_' ~ n] %}
I want made loop like of this on twig template:
for($i=1;$i<100;$i++) {
echo $i;
}
I solved this problem as:
{% if k > 0 %}
{% for i in 0..k - 1 %}
<div></div>
{% endfor %}
{% endif %}
if k = 0 -> no loop
if k = 1 -> 1 loop
if k = 100 -> 100 lopp
May be is other solve?
You can use range to reproduce loop output similar to the first php example
{% for i in range(1, 100-1) %}
{{ i }}
{% endfor %}
You can add the if inside the loop
{% for i in 0..k if k > 0 %}
{{ i }}
{% endfor %}
demo
edit: This doesn't work anymore in twig 3.X. You have to place the if inside the codeblock
When I attempt to assign the forloop index (or anything else) to a variable in a for-loop and then use it outside (after) the loop, the assigned value is lost. The code below is one of about 20 different approaches I have tried. None of them have worked. I just need to know if x contains y (so the variable can either be boolean or an integer or anything).
{% assign has_y = 0 %}
{% for x in collection %}
{% if x contains y %}
<span style="display: none">{{ has_y | plus: 1 }}</span>
{% endif %}
{% endfor %}
{% if has_y < 1 %}
THIS DOESN'T WORK AS EXPECTED
{% endif %}
I'm confused about Shopify's scoping rules...
The problem is you are outputting {{ has_y | plus: 1 }}, but not assigning anything to has_y inside the for loop.
Try this:
{% assign has_y = 0 %}
{% for x in collections %}
{% if x contains y %}
{% assign has_y = has_y | plus: 1 %}
<span style="display: none">{{ has_y }}</span>
{% endif %}
{% endfor %}
{% if has_y < 1 %}
...
{% endif %}
Or, if you want to use boolean values instead:
{% assign has_y = false %}
{% for x in collections %}
{% if x contains y %}
{% assign has_y = true %}
<span style="display: none">{{ has_y }}</span>
{% endif %}
{% endfor %}
{% if has_y == false %}
...
{% endif %}
Also, you may want to check your for loop {% for x in collection %}. collection is an object. Maybe you meant to iterate over collection.products or collections instead?
I was wondering what is the proper way of finding the index of an item in an array is in a Liquid template, and selected related items based off of the index. Currently I'm able to calculate the value, but it seems to be a string and I can't then find other items in the array with the string. For example in a CMS:
{% for site_page in site.pages.all %}
{% if site_page.id == page.id %}
{% assign page_index = forloop.index0 %}
{% capture previous_page_index %}
{{ page_index | minus: 1 }}
{% endcapture %}
{% break %}
{% endif %}
{% endfor %}
The expected value can be found in previous_page_index (in this case 0) however, if i try to do something like site.pages.all[previous_page_index] I receive no output. If I do the same thing with a hardcoded index value: site.pages.all[0] it does yield an output. Does anyone have an idea/example on how this is supposed to be done in liquid?
Best I can figure is to use {% for item in array limit:1 offset:forloop.index0 %}. For example:
require 'liquid'
chars = %w[a b c]
names = %w[alpha bravo charlie]
puts Liquid::Template.parse(<<DONE).render( 'chars'=>chars, 'names'=>names )
{% for c in chars %}
{{c}} is
{% for n in names limit:1 offset:forloop.index0 %}{{n}}{% endfor %}
{% endfor %}
DONE
…which produces…
a is
alpha
b is
bravo
c is
charlie
Editorial aside: ouch. What an ugly tempting language. I understand its goals, but the burden it places on users is heinous.
I use twig and have some data in array. I use for loop to access all data like this:
{% for item in data %}
Value : {{ item }}
{% endfor %}
Is it possible to access previous item in loop? For example: when I'm on n item, I want to have access to n-1 item.
There's no built-in way to do that, but here's a workaround:
{% set previous = false %}
{% for item in data %}
Value : {{ item }}
{% if previous %}
{# use it #}
{% endif %}
{% set previous = item %}
{% endfor %}
The if is neccessary for the first iteration.
In addition to #Maerlyn 's example, here is code to provide for next_item (the one after current one)
{# this template assumes that you use 'items' array
and each element is called 'item' and you will get
'previous_item' and 'next_item' variables, which may be NULL if not availble #}
{% set previous_item = null %}
{%if items|length > 1 %}
{% set next_item = items[1] %}
{%else%}
{% set next_item = null %}
{%endif%}
{%for item in items %}
Item: {{ item }}
{% if previous_item is not null %}
Use previous item here: {{ previous_item }}
{%endif%}
{%if next_item is not null %}
Use next item here: {{ next_item }}
{%endif%}
{# ------ code to udpate next_item and previous_item elements #}
{%set previous_item = item %}
{%if loop.revindex <= 2 %}
{% set next_item = null %}
{%else%}
{% set next_item = items[loop.index0+2] %}
{%endif%}
{%endfor%}
My solution:
{% for item in items %}
<p>item itself: {{ item }}</p>
{% if loop.length > 1 %}
{% if loop.first == false %}
{% set previous_item = items[loop.index0 - 1] %}
<p>previous item: {{ previous_item }}</p>
{% endif %}
{% if loop.last == false %}
{% set next_item = items[loop.index0 + 1] %}
<p>next item: {{ next_item }}</p>
{% endif %}
{% else %}
<p>There is only one item.</p>
{% endif %}
{% endfor %}
I had to make endless image gallery where before first item goes last one and after last item goes first one. It could be done this way:
{% for item in items %}
<p>item itself: {{ item }}</p>
{% if loop.length > 1 %}
{% if loop.first %}
{% set previous_item = items[loop.length - 1] %}
{% else %}
{% set previous_item = items[loop.index0 - 1] %}
{% endif %}
{% if loop.last %}
{% set next_item = items[0] %}
{% else %}
{% set next_item = items[loop.index0 + 1] %}
{% endif %}
<p>previous item: {{ previous_item }}</p>
<p>next item: {{ next_item }}</p>
{% else %}
<p>There is only one item.</p>
{% endif %}
{% endfor %}