How to use dynamic keys in dust to map content in properties file

Question

I am getting a JSON from contollers and on the basisi of value of this JSON i want to set key in my dust file, so that this key will access data from properties file.

For example I am getting "step" from controllers.

   {
      step: step1
   }

I want to set key in dust:

   {@pre type="content" key="{step}"/}

and in properties I have

step1=This is dynamic key
step2=print this

but i am getting step1 in dust. its not accesing the values of keys. Can anyone suggest me how to display values associated with keys in this situtaion.

Answer 1

{@pre type="content" key=step/}

when step is a variable. To set a string, ex: 'stackoverflow', try:

{@pre type="content" key="stackoverflow"/}

Answer 2

Is this your own pre helper?

You need to change the behavior of the helper to adjust what it does with the param.

function(chunk, context, bodies, params) {
  // Assuming I have {@pre key="{step}" /}
  params.key; // <== this will be a Dust function that, when run, returns "step1"
  dust.helpers.tap(params.key, chunk, context); // <== the string "step1"
  context.get(dust.helpers.tap(params.key, chunk, context)); // <== the string "This is dynamic key"
}

You want to evaluate the parameter, then get the corresponding key from the context, so you want the third form.

dust.helpers.tap requires the dustjs-helpers addon library.