Template Render to keep unresolved variables as-is in the output

[kasingal]

I am interested in rendering a template in multiple steps or keeping the references for the undefined variables in Jinja2.
Basically not to set value as null for undefined/unresolved variables and keep references/variable as-is if they are missing in the context.

Example: Let's say context has only name = "test", and then redering the following template:
<p>{{name}} has {{quantity}}</p>

I expact the output as below:
<p>test has {{quantity}}</p>

but as of today, output looks like below:
<p>test has </p>

Does anyone know if this is achievable within current version, or it would need an additional configuration to be added ?

[marius-diumia]

Looks like this feature doesn't exists and I'm Interested as well on using it.
Pushed a PR for this: #1072

[jasmith-hs]

For simple cases, this can already be done with:

context.setDynamicVariableResolver(string -> "{{ " + string + " }}");

[marius-diumia]

Great @jasmith-hs, thank you. It does for now what I need. Checked, but it doesn't work when the token has filters to apply.

[kasingal]

@jasmith-hs | @marius-diumia

Rather than complex solution, as a workaround I created a wrapper on JinjavaInterpreter and just override getAsString() method to not set empty string rather keep the context.currentNode.master.image as-is.

Refer: https://gerrit.onap.org/r/c/ccsdk/cds/+/134501/1/ms/blueprintsprocessor/modules/blueprints/blueprint-core/src/main/kotlin/org/onap/ccsdk/cds/controllerblueprints/core/service/BluePrintJinjaTemplateService.kt#130

This solution can be in original JinjavaInterpreter as a default behavior.