Performing numerous queries in MongoDB (using Mongoose) prior to sending back a JSON response

Question

Performing numerous queries in MongoDB (using Mongoose) prior to sending back a JSON response

I'm developing a MERN application that involves a one-to-many many-to-many relationship between Users and Organizations. Currently, I am working on creating a function that retrieves all the organizations a user is affiliated with.

Within my routes folder, I have implemented

export const getOrganizations = async (req, res) => {
  try {
    const currentUser = await User.findById(req.user.id)
    
    let organizations = [];
    await currentUser.organizationIds.forEach(async orgId => {
      let organization = await Organization.findById(orgId);
      console.log(organization)
      organizations.push(organization);
    })
    console.log("ORGS")

    res.status(200).json(organizations);
  } catch (error) {
    console.log(error);
    return res.status(500).json({
      message: error.message
    });
  }
}

I believe that incorporating await and async is crucial to resolving the issue at hand. Presently, my console output of "ORGS" appears before displaying the organizations in my forEach loop. Nonetheless, I am uncertain about the exact steps required to rectify this situation.

javascript mongodb express mongoose

Answer 1

Answer №1

The issue lies in the asynchronous callback within the forEach function. To solve this, consider using a for loop instead to properly utilize await without skipping ahead while waiting for the asynchronous code to complete. For example:

for(let i = 0; i < currentUser.organizationIds.length; i++) {
   let organization = await Organization.findById(currentUser.organizationIds[i]);
   console.log(organization)
   organizations.push(organization);
}

Alternatively, you can use the map function to store all promises in an array and then utilize Promise.all to ensure they all finish before proceeding. Example:

const fetchOrg = async orgId => {
  let organization = await Organization.findById(orgId);
  console.log(organization)
  organizations.push(organization);
}
let promises = currentUser.organizationIds.map(orgId => fetchOrg(orgId))
await Promise.all(promises);

Answer 2

The issue lies in the asynchronous callback within the forEach function. To solve this, consider using a for loop instead to properly utilize await without skipping ahead while waiting for the asynchronous code to complete. For example:

for(let i = 0; i < currentUser.organizationIds.length; i++) {
   let organization = await Organization.findById(currentUser.organizationIds[i]);
   console.log(organization)
   organizations.push(organization);
}

Alternatively, you can use the map function to store all promises in an array and then utilize Promise.all to ensure they all finish before proceeding. Example:

const fetchOrg = async orgId => {
  let organization = await Organization.findById(orgId);
  console.log(organization)
  organizations.push(organization);
}
let promises = currentUser.organizationIds.map(orgId => fetchOrg(orgId))
await Promise.all(promises);

Answer 3

Answer №2

It seems that in the User model, there is a property called organizationIds which holds an array of ObjectIds referencing the Organization schema, defined as follows:

organizationIds: [{type: mongoose.Schema.Types.ObjectId, ref: 'Organization' }]

If this is the setup, you can easily use the populate method to populate the organizationIds property:

export const getOrganizations = async (req, res) => {
  try {
    const currentUser = await User.findById(req.user.id).populate('organizationIds');
    
    res.status(200).json({organizations: currentUser.organizationIds});
  } catch (error) {
    console.log(error);
    return res.status(500).json({
      message: error.message
    });
  }
}

Answer 4

It seems that in the User model, there is a property called organizationIds which holds an array of ObjectIds referencing the Organization schema, defined as follows:

organizationIds: [{type: mongoose.Schema.Types.ObjectId, ref: 'Organization' }]

If this is the setup, you can easily use the populate method to populate the organizationIds property:

export const getOrganizations = async (req, res) => {
  try {
    const currentUser = await User.findById(req.user.id).populate('organizationIds');
    
    res.status(200).json({organizations: currentUser.organizationIds});
  } catch (error) {
    console.log(error);
    return res.status(500).json({
      message: error.message
    });
  }
}

Performing numerous queries in MongoDB (using Mongoose) prior to sending back a JSON response

Answer №1

Answer №2

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