I want to check if a condition in the linked database is true and then execute some code but I am getting error such as
jinja2.exceptions.TemplateSyntaxError: expected token ':', got '}'
{% for prod in prod %}
{% if {{prod.sh}} is 1 %}
<pre>Lines to come if true</pre>
{% endif %}
{% endfor %}
The extensive Jinja2 documentation can be found at https://jinja.palletsprojects.com/en/2.11.x/templates/
About your code - I spot two problems.
You should not use for prod in prod - rather, but something like for product in products, ie name them differently.
You do not have to put angle brackets around prod.sh. You would do this only when the variable is referenced directly within the HTML code.
So a working code could look like:
{% for prod in prod %}
{% if prod.sh == 1 %}
<pre>Lines to come if true</pre>
{% endif %}
{% endfor %}
Related
I need to build a list of urls to some static images in my html. I am using jinja templates and as I understand this should work -
{% set urlList=[] %}
{% for i in data['a-list-of-tuples'] %}
{% urlList.append(url_for('static', filename='sample_out/segmented/' + i[0])) %}
{% endfor %}
But I get the error - jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'urlList'
However this works -
{% set urlList=[] %}
{% for i in data['a-list-of-tuples'] %}
{{ urlList.append(url_for('static', filename='sample_out/segmented/' + i[0])) }}
{% endfor %}
I am not sure what is happening here, can someone shed some light on this please?
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 to dbt and jinja2
I am using union_relations from dbt_utils package (0.5.0).
I created my macro which takes list of fully qualified name (like database.schema.identifier) splits it and uses api.Relations.create (link) to create a relation and append each relation to a list.
{{ list_of_relation }} is given to dbt_utils.union_relations(as relations=my_macro([list of fully qualified names])), it's giving me an _is_relation error, I did use log to debug and see if it actually creates a relation and it does. What could be wrong?
It sounds like you have a macro written something like this:
{% macro my_macro(names) %}
{% set list_of_relations = [] %}
{% for name in names %}
{% set relation = something(name) %}
{% do list_of_relations.append(relation) %}
{% endfor %}
{{ list_of_relations }}
{% endmacro %}
Instead of using {{ list_of_relation }}, you’ll want {{ return(list_of_relation) }} or {% do return(list_of_relation) %}. The problem is that {{ ... }} turns things into strings in jinja macros, and macros by default return strings.
The documentation on return is here.
while writing an application in django, I've encountered a problem. I want to make page-number links, with current page not being a link. So in template I do this:
{% for i in pages %}
{% if i == curr_page %} {{ i }}
{% else %} {{ i }}
{% endif %}
Only problem? Jinja doesn't seem to notice two numbers being equal. I've changed the 2nd line to {% if i != curr_page %} {{i}}!={{curr_page}} and got "... 5!=6 6!=6 7!=6 ...".
What should I do?
Because they are not of same data type. In your view, cast them to int before passing to context dict.
pages = list(map(int, pages))
curr_page = int(curr_page)
I wanted to create a simply include which simplifies creating a carousel. So I was looking for the syntax to give a list of image urls as a parameter. However I couldn't find anything about this.
{% include carousel.html images=WHAT HERE? %}
You can create a list as a string then convert it into an array inside your snippet. This is the way I would do it.
{% assign urls = 'url1.jpg,url2.jpg,url3.jpg' %}
{% include carousel.html images=urls %}
Of course this is the same as:
{% include carousel.html images='url1.jpg,url2.jpg,url3.jpg' %}
carousel.html
{% assign images = include.images | split: ',' %}
{% for image in images %}
{{ image }}
{% endfor %}