[Solved] How to use virtual-dom's "h" helper in <head> for header-dropdown hamburger widget override? + How to override @computed method?

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@david

Another things that I’m trying to do, if you have an answer that will avoid the need to create a separate topic.

I want to throw a validation message when the user only chooses one level of category.

I was attempting to override categoryValidation() of composer.js.es6 … except that is a @computed method.

Looking at https://github.com/discourse/discourse-assign/blob/master/assets/javascripts/discourse-assign/initializers/extend-for-assigns.js.es6#L69 this should be doable.

My issue is that from the <head>, I don’t have acces to @computed. Is there a way to require it?

I did manage to override the controller:composer save action. However, from there I don’t have access to InputValidation to throw a custom error (I wouldn’t know how to target the correct input from there either).

<script type="text/discourse-plugin" version="0.8.23">
    api.modifyClass('controller:composer', {
        @computed("model.categoryId", "lastValidatedAt") //ReferenceError: computed is not defined
        categoryValidation() {
            console.log('categoryValidation');
            this._super();
        }
    });
</script>