salix/modules/ticket/back/methods/ticket-log/getChanges.js

module.exports = Self => {
    Self.remoteMethodCtx('getChanges', {
        description: 'Check if a ticket is editable',
        accessType: 'READ',
        accepts: [{
            arg: 'id',
            type: 'number',
            required: true,
            description: 'the ticket id',
            http: {source: 'path'}
        }],
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/:id/getChanges`,
            verb: 'get'
        }
    });

    Self.getChanges = async(ctx, id, options) => {
        const models = Self.app.models;
        const myOptions = {};

        if (typeof options == 'object')
            Object.assign(myOptions, options);

        const ticketLogs = await models.TicketLog.find({where: {originFk: id}}, myOptions);

        const changes = [];
        for (const ticketLog of ticketLogs) {
            const isUpdate = ticketLog.action == 'update';

            if (ticketLog.description && isUpdate)
                changes.push(ticketLog.description);

            const oldQuantity = ticketLog.oldInstance ? ticketLog.oldInstance.quantity : null;
            const newQuantity = ticketLog.newInstance ? ticketLog.newInstance.quantity : null;

            if (ticketLog.changedModel == 'Sale' && isUpdate && ticketLog.newInstance.quantity) {
                const item = await models.Item.findById(ticketLog.changedModelId, null, myOptions);
                changes.push(`${item.name} cambia de ${oldQuantity} a ${newQuantity}`);
            }

            if (ticketLog.changedModel == 'Ticket' && isUpdate && ticketLog.newInstance.quantity)
                changes.push(`${ticketLog.oldInstance.concept} cambia de ${oldQuantity} a ${newQuantity}`);
        }
        return changes.join('\n');
    };
};