CODEWITHSUNDEEP
pythondjangojinja2
Gnanavel pandian
Gnanavel pandian

Reputation: 83

How to use jinja tag inside jinja tag

This is my code: 

{% if {{post.author.profile.image.url}} is None %}

When I run this code I get an error

Could not parse the remainder: '{{post.author.profile.image.url}}' from '{{post.author.profile.image.url}}'

How to solve this? And how to use a template tag inside a template tag

Upvotes: 2

Views: 6206

Answers (3)

Sergei Sadovnikov
Sergei Sadovnikov

Reputation: 376

The first question has already answered. Regarding to this one:

And how to use a template tag inside a template tag

Short answer: you can't. Long answer: you can with help of the 'block assignment' tag ( http://jinja.pocoo.org/docs/2.10/templates/#block-assignments ) :

{% set somevar %}
... any number of tags here {{ post.author.profile.image.url }} ...
{% endset %}
...
{% if somevar is None %} ... {% endif %}

You can also (since Jinja2 2.10) apply filter to the assignment:

{% set somevar | default('Empty') %}
... any number of tags here {{ post.author.profile.image.url }} ...
{% endset %}

Upvotes: 0

bruno desthuilliers
bruno desthuilliers

Reputation: 77902

abdusco's already answered the first part of your question ("how to solve this").

wrt/ the second part:

how to use a template tag inside a template tag

The simple answer is: you can't, period. Why it's not possible becomes rather obvious once you understand how the template system works, and that would be mostly useless anyway (if you find yourself trying to use a tag within a tag then you're doing it wrong and there's a better way, really).

NB: when I say you can`t nest tags, I mean that you can't do this:

{% sometag arg={% some_other_tag %} %}

Now in your example, what you're trying to do is not "using a tag inside a tag", but using a context variable within a tag, and this is of course possible (else the template language would be rather hard to use), as shown in abdusco's answer. And you can also use filter expressions (apply a filter to a context variable) here, ie {% mytag some.variable|upper %}, at least if the template tag is correctly implemented.

Upvotes: 0

abdusco
abdusco

Reputation: 11091

Use the value of expression directly, you shouldn't wrap it inside braces:

{% if post.author.profile.image.url is None %}
   ...
{% endif %}

Upvotes: 6

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