salix/modules/client/back/models/greuge.js

const LoopBackContext = require('loopback-context');

module.exports = function(Self) {
    require('../methods/greuge/sumAmount')(Self);

    Self.observe('before save', function(ctx, next) {
        const loopBackContext = LoopBackContext.getCurrentContext();

        let userFk = loopBackContext.active.accessToken.userId;

        if (ctx.instance)
            ctx.instance.userFk = userFk;
        else
            ctx.data.userFk = userFk;

        next();
    });

    Self.validatesLengthOf('description', {
        max: 45,
        message: 'Description should have maximum of 45 characters'
    });
};