Question

I just want to loop through an existing list and make a comma delimited string out of it.
Something like this: my_string = stuff, stuff, stuff, stuff

I already know about loop.last, I just need to know how to make the third line in my code below WORK.

{% set my_string =    %}
{% for stuff in stuffs %}
{% set my_string = my_string + stuff +  ,  %}
{% endfor%}

Answer 1

If stuffs is a list of strings, just this would work:

{{ stuffs|join(", ") }}

See join filter documentation, as well as filters in general documentation.

p.s.

More reader friendly way

{{ my ~  ,   ~ string }}

Answer 2

You can use + if you know all the values are strings. Jinja also provides the ~ operator, which will ensure all values are converted to string first.

{% set my_string = my_string ~ stuff ~  ,  %}

Answer 3

My bad, in trying to simplify it, I went too far, actually stuffs is a record of all kinds of info, I just want the id in it.

stuffs = [[123, first, last], [456, first, last]]

I want my_sting to be

my_sting =  123, 456

My original code should have looked like this:

{% set my_string =    %}
{% for stuff in stuffs %}
{% set my_string = my_string + stuff.id +  ,  %}
{% endfor%}

Thinking about it, stuffs is probably a dictionary, but you get the gist.

Yes I found the join filter, and was going to approach it like this:

 {% set my_string = [] %}
 {% for stuff in stuffs %}
 {% do my_string.append(stuff.id) %}
 {% endfor%}
 {%  my_string|join( ,  ) %}

But the append doesn t work without importing the extensions to do it, and reading that documentation gave me a headache. It doesn t explicitly say where to import it from or even where you would put the import statement, so I figured finding a way to concat would be the lesser of the two evils.

Answer 4

If you can t just use filter join but need to perform some operations on the array s entry:

{% for entry in array %}
User {{ entry.attribute1 }} has id {{ entry.attribute2 }}
{% if not loop.last %}, {% endif %}
{% endfor %}

Answer 5

Just another hack can be like this.

I have Array of strings which I need to concatenate. So I added that array into dictionary and then used it inside for loop which worked.

{% set dict1 = { e :  } %}
{% for i in list1 %}
{% if dict1.update({ e :dict1.e+":"+i+"/"+i}) %} {% endif %}
{% endfor %}
{% set layer_string = dict1[ e ] %}

Answer 6

You have to use the join method to concatenate strings and variables. Here is an example of how to do that.

{% set module = "XYZ" %}
{% set jarfile = [module,  - , version,  -jar-with-dependencies.jar ]|join %}

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