How to get all count of mongoose model

In Mongoose, if you want to obtain the total count of all models, you typically need to execute a count query for each model individually and sum up the results. Here's an example of how to implement this process in Mongoose:

Suppose you have multiple models, such as User, Post, and Comment; you can do the following:

javascript
const mongoose = require('mongoose');

// Assume you have already defined and connected the models
const User = mongoose.model('User');
const Post = mongoose.model('Post');
const Comment = mongoose.model('Comment');

async function getTotalCountOfModels() {
  try {
    // Retrieve the count for each model individually
    const userCount = await User.countDocuments().exec();
    const postCount = await Post.countDocuments().exec();
    const commentCount = await Comment.countDocuments().exec();

    // Sum up the counts of all models
    const totalCount = userCount + postCount + commentCount;
    
    console.log(`Total count: ${totalCount}`);
    return totalCount;
  } catch (error) {
    console.error('Error occurred while retrieving the total count of models', error);
    throw error;
  }
}

// Call the function
getTotalCountOfModels()
  .then(total => console.log('Total count:', total))
  .catch(err => console.error(err));

In this example, the countDocuments() method is used to count the number of documents in each model. We employ async/await for asynchronous operations and try/catch to handle potential errors.

This is a basic example; in practical applications, it may involve more complex logic, such as filtering conditions and related queries. Additionally, if there are numerous models, you might need a more automated approach to iterate through all models rather than manually invoking each one.