Is there a method to retrieve the IDs of two distinct collections within a single JavaScript function?

Question

Is there a method to retrieve the IDs of two distinct collections within a single JavaScript function?

I am dealing with two collections within a single database – "Neighborhood" and "Restaurants". My goal is to identify the exact neighborhood I am currently in so that when I click on the "back" button located on the restaurant.ejs page, it directs me back to the page associated with that specific neighborhood's id.

Despite my attempts using findById({} ... and findById(id, ..., I have been encountering errors.

Below is my code snippet. Could you assist me in determining what should be added in place of the ??? for a potential resolution?

neighborhood.get('restaurant/:id', (req, res) => {
  Restaurant.findById(req.params.id, (err, restaurantInfo) => {
    Neighborhood.findById(???, (err, foundNeighborhood) => {
      res.render('restaurant.ejs', {
        restaurant: restaurantInfo,
        neighborhood: foundNeighborhood
      })
    });
  });
});

javascript mongodb express mongoose ejs

Answer 1

Answer №1

Assuming I've comprehended your query correctly, the information returned by restaurantInfo will either include details about the neighborhood as mentioned by @paolo, or you may need to establish a method to search for the neighborhood within the req, perhaps in this manner:

 Restaurant.findById(req.params.id, (err, restaurantInfo) => {
    Neighborhood.findById(req.params.neignborhoodId, (err, foundNeighborhood) => {
      res.render('restaurant.ejs', {
        restaurant: restaurantInfo,
        neighborhood: foundNeighborhood
      })
    })
  })
});

If there are errors occurring, it's advisable to incorporate error checking in the callback function like so:

 Restaurant.findById(req.params.id, (err, restaurantInfo) => {
   if (err) {
     return err  // additional error message can be added here
   } else {
    Neighborhood.findById(req.params.neignborhoodId, (err, foundNeighborhood) => {
      if (err) {
        return err
      }
      res.render('restaurant.ejs', {
        restaurant: restaurantInfo,
        neighborhood: foundNeighborhood
        }
      })
    })
  })
});

In my opinion, depending on your project requirements, it might be simplest to include the neighborhood id as part of the restaurant information. In that case, you could pass in the neighborhood id like this:

Neighborhood.findById(restaurantInfo.neighborhoodId, (err, foundNeighborhood) => {

If feasible, utilizing the neighborhood name to locate the neighborhood id could be an option since you specified that the restaurantInfo includes the neighborhood name. Alternatively, you could opt for a Neighborhood.findByName search instead of using findById.

Answer 2

Assuming I've comprehended your query correctly, the information returned by restaurantInfo will either include details about the neighborhood as mentioned by @paolo, or you may need to establish a method to search for the neighborhood within the req, perhaps in this manner:

 Restaurant.findById(req.params.id, (err, restaurantInfo) => {
    Neighborhood.findById(req.params.neignborhoodId, (err, foundNeighborhood) => {
      res.render('restaurant.ejs', {
        restaurant: restaurantInfo,
        neighborhood: foundNeighborhood
      })
    })
  })
});

If there are errors occurring, it's advisable to incorporate error checking in the callback function like so:

 Restaurant.findById(req.params.id, (err, restaurantInfo) => {
   if (err) {
     return err  // additional error message can be added here
   } else {
    Neighborhood.findById(req.params.neignborhoodId, (err, foundNeighborhood) => {
      if (err) {
        return err
      }
      res.render('restaurant.ejs', {
        restaurant: restaurantInfo,
        neighborhood: foundNeighborhood
        }
      })
    })
  })
});

In my opinion, depending on your project requirements, it might be simplest to include the neighborhood id as part of the restaurant information. In that case, you could pass in the neighborhood id like this:

Neighborhood.findById(restaurantInfo.neighborhoodId, (err, foundNeighborhood) => {

If feasible, utilizing the neighborhood name to locate the neighborhood id could be an option since you specified that the restaurantInfo includes the neighborhood name. Alternatively, you could opt for a Neighborhood.findByName search instead of using findById.

Is there a method to retrieve the IDs of two distinct collections within a single JavaScript function?

Answer №1

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