validations.js

import Ember from "ember";

const Proxy = Ember.Object.extend({
    init() {
        this.set("errors", []);
    },

    isEmpty() {
        const value = this.get("value");
        const result = value === null && value === undefined && value === "";

        if (!result) {
            this.errors.pushObject("empty");
        }

        return result;
    },

    isFilled() {
        const value = this.get("value");
        const result = value !== null && value !== undefined && value !== "";

        if (!result) {
            this.errors.pushObject("filled");
        }

        return result;
    },

    isInteger() {
        const value = this.get("value");
        const result = Number.isInteger(result);

        if (!result) {
            this.errors.pushObject("integer");
        }

        return result;
    }
});

export default Ember.Object.extend({
    companyName: "",

    validate() {
        let isValid = true;
        const validations = this.get("validations");

        this.set("errors", Ember.Object.create());

        Object.keys(validations).forEach((attributeName) => {
            const validator = validations[attributeName];
            const value = this.get(attributeName);
            const proxy = Proxy.create({ value });

            if (!validator.apply(this, [proxy])) {
                isValid = false;
                this.set(`errors.${attributeName}`, proxy.get("errors"));
            }
        });

        return isValid;
    },

    validations: {
        companyName: (companyName) => companyName.isFilled()
    }
});