discourse-custom-wizard/assets/javascripts/discourse/components/wizard-realtime-validations.js.es6

import Component from "@ember/component";
import EmberObject from "@ember/object";
import { cloneJSON } from "discourse-common/lib/object";
import Category from "discourse/models/category";

export default Component.extend({
    init(){
        this._super(...arguments);
        if (!this.validations) return;

        if (!this.field.validations) {
            const validations = {};
            this.validations.forEach((validation) => {
                validations[validation] = {};
            });

            this.set('field.validations', EmberObject.create(validations));
        }

        const validationBuffer = cloneJSON(this.get('field.validations'));
        let bufferCategories;
        if( validationBuffer.similar_topics && (bufferCategories = validationBuffer.similar_topics.categories)) {
            const categories = Category.findByIds(bufferCategories);
            validationBuffer.similar_topics.categories = categories;
        }
        this.set('validationBuffer', validationBuffer);
    },

    actions: {
        updateValidationCategories(name, validation, categories) {
            this.set(`validationBuffer.${name}.categories`, categories);
            this.set(`field.validations.${name}.categories`, categories.map(category => category.id));
        }
    }
});