feat(multilang): add decorator for localized fields

addon/decorators/localized-attr.js

@@ -0,0 +1,44 @@
+import { attr } from "@ember-data/model";
+
+export default function (...args) {
+  const [target, name] = args;
+
+  const attrComputed = attr(...args);
+  const { get: getter, set: setter } = attrComputed;
+
+  target.localizedFields = [...(target.localizedFields || []), name];
+
+  attrComputed.get = function () {
+    const value = getter.call(this);
+
+    return value && value[this.getFieldLocale()];
+  };
+
+  attrComputed.set = function (value) {
+    let attribute = getter.call(this);
+
+    if (!attribute) {
+      attribute = this.intl.locales.reduce(
+        (accumulator, currentValue) => ({
+          ...accumulator,
+          [currentValue]: "",
+        }),
+        {}
+      );
+    }
+
+    attribute[this.getFieldLocale()] = value;
+    setter.call(this, attribute);
+  };
+
+  Object.defineProperty(target, `_${name}`, {
+    get() {
+      return getter.call(this);
+    },
+    set(value) {
+      setter.call(this, value);
+    },
+  });
+
+  return attrComputed;
+}

app/decorators/localized-attr.js

@@ -0,0 +1 @@
+export { default } from "ember-emeis/decorators/localized-attrs";