toString() {
    let idLabel = this.id ? `(${this.id})` : "";

    return `model:${this.modelName}${idLabel}`;
  }
Simple string representation of the model and id.

    ```js
    let post = blogPosts.find(1);
    post.toString(); // "model:blogPost:1"
    ```

    @method toString
    @return {String}
    @public