NodeJS和MongoDB中的过滤器出现问题

Question

Build an application with MongoDB and NodeJS as backend-server. Fetched some companies details from database according to their category id , the problem is that the information is not displayed on both postman and ionic project, when called this API.

What to do to resolve this problem?

Sample code:

function filtrarPorCategoria(busqueda, regex) {
    return new Promise((resolve, reject) => {
        Empresa.find({ categoria: busqueda }, 'nombre estado').exec((err, empresas) => {
            if (err) {
                reject('Error al cargar las empresas', err);
            } else {
                console.log(empresas);
                resolve(empresas);
            }
        });
    });
}

This is response over postman

Answer 1

You do not need to wrap the whole thing with Promise since exec gives you a fully-fledged one already:

const getFn = (busqueda) =>
    Empresa.find({ categoria: busqueda }, 'nombre estado').exec()
      .then(empresas => console.log(empresas))
      .catch(err => console.log(err))  

Also in your case specifically you are dealing with promise and you are not returning anything (should be return Empresa.find(... ). In the code above we use ES6 implicit return.