Show placeholders in case they’re not present in the scope

[d4vsanchez]

Hi everyone!

I've been working on a feature in which I need to make use of the features that LiquidJS provides (mainly the case/when operator) but in case there's no value in the scope of the selected message, I need to show the message.

For example, if the message inside the when operator have the following message: You have chatted with {{user.name}} and there is no { user: { name } } in the scope, I need to show the placeholder originally instead of LiquidJS converting it into a blank space character.

I have tried doing an Object Proxy that evaluates to true in case any property is queried or passed to it, this way I can pass object as the scope variable, but it's not working correctly:

const scope = new Proxy({}, {
  get: (target, attr) => {
    if (attr in target) {
      return target[attr];
    }
    return `{{${attr}}}`;
  },

  has: () => true
});

Do you know if there's a way to do this? Or if you could help me to understand which entity to look so I can better understand how's the scope handled in order to get the data from there.

Thanks!

[harttle]

I believe the default filter will do the trick:

{{ user.name | default: 'nobody' }}

In case you set strictVariables, you'll need also set lenientIf to allow default filter to suppress the undefined error.