salix/back/methods/collection/assign.js

const UserError = require('vn-loopback/util/user-error');
module.exports = Self => {
    Self.remoteMethodCtx('assign', {
        description: 'Assign a collection',
        accessType: 'WRITE',
        http: {
            path: `/assign`,
            verb: 'POST'
        },
        returns: {
            type: ['object'],
            root: true
        },
    });

    Self.assign = async(ctx, options) => {
        const userId = ctx.req.accessToken.userId;
        const myOptions = {userId};

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

        const randStr = Math.random().toString(36).substring(3);
        const result = await Self.rawSql(`
            CALL vn.collection_assign(?, @vCollectionFk);
            SELECT @vCollectionFk ?
            `, [userId, randStr], myOptions);

        // Por si entra en SELECT FOR UPDATE una o varias veces
        const collectionFk = result.find(item => item[0]?.[randStr] !== undefined)?.[0]?.[randStr];

        if (!collectionFk) throw new UserError('There are not picking tickets');
        await Self.rawSql('CALL vn.collection_printSticker(?, NULL)', [collectionFk], myOptions);

        return collectionFk;
    };
};