I'm trying to make a template which iterates over a list to check if a string exists. if it does then something happens, if the string isn't in the list, something else should happen. The issue is the result is repeated for all the lines in the list, which i do not want.
e.g.
The list is some simple yaml
LIST:
- A
- B
- C
Jinja looks like
{% for line in mylist %}
{% if 'A' in line %}
{{ A }} Was found in the list
{% else %}
{{ A }} Was not found
{% endif %}
{% endfor %}
So when 'A' matches i get this
A Was found in the list
A Was not found
A Was not found
And when 'A' does not match i get this:
A Was not found
A Was not found
A Was not found
Basically i need to stop it iterating over the list and just do one thing if it matches or one thing if it doesn't match
So if 'A' matches i need it to just do
A was found
If 'A' doesn't match i need it to just do A was not found
Use some kind of flag variable:
{% set ns = namespace(found=false) %}
{% for line in mylist %}
{% if 'A' in line %}
{% set ns.found=true %}
{% endif %}
{% endfor %}
{% if ns.foo %}
{{ A }} Was found in the list
{% else %}
{{ A }} Was not found
{% endif %}
Related
I have a use case where I would like to define the name of a macro and then apply it to one column.
A simplified example could be as follows. I have two macros defined that I want to call dynamically in my model (both take one column as an input):
cast_to_string
convert_empty_string_to_null_value
Now, I want to call them dynamically. See the example below
{%- set macro_names = ["cast_to_string", "convert_empty_string_to_null_value"] -%}
select
{% for macro_name in macro_names %}
-- this should dynamically be evaluated to `{{ cast_to_string(my_column) }}`
-- and `{{ convert_empty_string_to_null_value(my_column) }}`
{{ macro_name(my_column) }}
{% endfor %}
from my_model
However, this will throw an error saying that a string is not callable.
I also tried using {% raw %} {{ {% endraw %} to escape brackets, but that didn’t work either.
So, my question is, if there is a way to dynamically call macros in jinja/dbt?
I think it should work if you remove the quotes :
{%- set macro_names = [cast_to_string, convert_empty_string_to_null_value] -%}
So that jinja doesn't interpret it as string and you can use it as a Callable
I achieve it using this example :
{%- set macro_names = [print_lower, print_upper] -%}
{% for macro_name in macro_names %}
{{ macro_name("test") }}
{% endfor %}
and
{% macro print_lower(string) %}
{{ print(string|lower) }}
{% endmacro %}
{% macro print_upper(string) %}
{{ print(string|upper) }}
{% endmacro %}
I'm having an issue with a for loop in Shopify. I'm sure it used to work, but I can't get it to work over the number 9 now.
{% assign productTag1 = Availability14 %} (in this example, the product has only 1 tag, which is Availability14)
{% assign avail_stop = false %}
{% for j in (0..15) %}
{% assign check_avail = 'Availability' | append:j %}
{% if productTag1 contains check_avail %}
{% assign avail_stop = true %}
{% capture tag_name %}{{check_avail}}{% endcapture %}
{% break %}
{% endif %}
{% endfor %}
{% if avail_stop %}
{% assign availability = check_avail | remove:'Availability' | plus:0 %}
{% endif %}
At the moment, I'm returning 1, not 14. I imagine it's something to do with the fact 14 includes a 1, but I can't wrap my head around it.
Any help is appreciated.
You have a {% break %} statement in your if. Once the if becomes true it will exit the loop instantly.
If you want to skip the next code you must use {% continue %} not {% break %}.
On my mind this is an issue with conditional operator. As you said, 14 contains 1, so why not simply use strict conditional operator like this:
{% if productTag1 == check_avail %}
{% assign has_stop = true %}
{% break %}
{% endif %}
(or did I miss something?)
I would like to get the list of posts having a specific tag in their front matter (*)
I tried the code below, which iterates over all the tags of the current post pages (the current tag is t), then iterates over all the posts (p) to check if they have this tag (and just outputs the title, for debugging reasons):
{% for t in page.tags %}
{% for p in site.posts %}
{% if t in p.tags %}
{{ p.title }}
{% endif %}
{% endfor %}
{% endfor %}
The line {% if t in p.tags %} seems to fail (I come form a Python background so I gave it a try) and I cannot find the in operator in liquid. Does it exits?
(*) I am mentioning what I want to achieve in case there is a more straightforward way to do that but I am still interested in the general question.
Following your example it can be done with the contains tag:
contains can also check for the presence of a string in an array of
strings.
{% if product.tags contains "outdoor" %}
This product is great for
using outdoors!
{% endif %}
So to get the list of posts having a specific tag in their front matter (in this case the posts with the tag mytag):
{% assign posts_with_mytag = site.posts | where_exp:"item",
"item.tags contains 'mytag'" %}
{% for post in posts_with_mytag %}
{{post.title}}
{% endfor %}
Following-up on #maracuny's answer, the corrected code from my question for completeness:
{% for t in page.tags %}
{% for p in site.posts %}
{% if p.tags contains t %}
{{ p.title }}
{% endif %}
{% endfor %}
{% endfor %}
When searching an array for a match in a Liquid template, how do you call contains exactly? For example, if tag of a page may contain separable or non-separable, how do you find the pages that contain only the separable and not the non-separable tag? In my experience, the {% if post.tags contains 'separable' %} statement considers both cases.
Refer to the documentation you can use this filter
{% assign tags = post.tags | where:"tag","separable" %}
Loop through the array and check the values with a match operator. If it matches change a variable from false to true:
{% assign found_seperable = false %}
{% for tag in post.tags %}
{% if tag == 'separable' %}
{% assign found_seperable = true %}
{% endif %}
{% endfor %}
Then check the variable:
{% if found_seperable %}
do what you want if true
{% else %}
do what you want if false
{% endif %}
I want to display keywords and description automatically according to the category of the current post. I've used the following code, but it doesn't worked.
{% if page.categories = "category" %}
{% else %}
{% endif %}
But while using {% page.categories %} it is echoing out the category name correctly. Here are my two doubts:
How can I compare the current post's category?
Are {{ }} and {% %} are same here?
It should look like the following:
{% if page.categories == 'some-name' %}
Hei I am in some-name category
{% else %}
No I am not in some-name category
{% endif %}
2.
No, {{ }} and {% %} are not the same. {{ }} is used for echoing stuff, while {% %} is used for logic expressions and arguments.