salix/modules/claim/back/models/claim.js

const LoopBackContext = require('loopback-context');
module.exports = Self => {
    let cache = {};
    require('../methods/claim/filter')(Self);
    require('../methods/claim/getSummary')(Self);
    require('../methods/claim/createFromSales')(Self);
    require('../methods/claim/updateClaim')(Self);
    require('../methods/claim/regularizeClaim')(Self);
    require('../methods/claim/uploadFile')(Self);
    require('../methods/claim/claimObservation')(Self);
    require('../methods/claim/updateClaimAction')(Self);
    require('../methods/claim/updateClaimDestination')(Self);
    require('../methods/claim/downloadFile')(Self);
    require('../methods/claim/claimPickupPdf')(Self);
    require('../methods/claim/claimPickupEmail')(Self);
    require('../methods/claim/logs')(Self);

    Self.observe('before save', async ctx => {
        if (ctx.isNewInstance) return;
        const {data, currentInstance} = ctx;
        let changes = {};
        for (const [key, value] of Object.entries(data)) {
            const change = currentInstance[key];
            if (change !== value)
                changes[key] = value;
        }
        cache[currentInstance.id] = changes;
    });
    Self.observe('after save', async ctx => {
        const changes = cache[ctx.instance.id];
        if (ctx.isNewInstance) return;
        if (Object.keys(changes).length > 0) await sendMessage(ctx, changes);

        delete cache[ctx.instance.id];
    });
    async function sendMessage(ctx, changes) {
        const loopBackContext = LoopBackContext.getCurrentContext();
        const {http} = loopBackContext.active;

        const message = buildMessage(http.req.__, ctx.instance, changes);
        const instance = ctx.instance.client();
        await Self.app.models.Chat.send({...http}, instance.salesPersonUser().username, message);
    }

    function buildMessage($t, instance, changes) {
        let message = $t('This claim has been updated', {claimId: instance.id});
        return message;
    }
};