salix/services/client/common/models/ClientObservation.js

module.exports = function(ClientObservation) {
    ClientObservation.validate('text', isEnabled, {message: 'Se debe rellenar el campo de texto'});
    function isEnabled(err) {
        if (!this.text) err();
    }

    ClientObservation.observe('before save', function(ctx, next) {
        ctx.instance.creationDate = Date();
        next();
    });
};