salix/modules/worker/back/models/device.js

const UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    require('../methods/device/handle-user')(Self);
    Self.rewriteDbError(function(err) {
        if (err.code === 'ER_DUP_ENTRY')
            return new UserError(``);
        return err;
    });
};