Nodal find_by example

model.js

    /**
    * Finds a model with a provided column value, otherwise returns a notFound error.
    * @param {object} A single key object that contains the model column name and value you're looking for
    * @param {function({Error} err, {Nodal.Model} model)} callback The callback to execute upon completion
    */
    static find_by(findObject, callback) {

      return new Composer(this)
        .where(queryObject)
        .end((err, models) => {

          if (!err && !models.length) {
            let queryBy = Object.keys(findObject)[0];
            let err = new Error(`Could not find ${this.name} with ${queryBy} "${findObject[queryBy]}".`);
            err.notFound = true;
            return callback(err);
          }

          callback(err, models);

        });

    }