Using MongoDB to efficiently paginate results

Question

Using MongoDB to efficiently paginate results

Currently engaged in the development of a web application using MongoDB, which dynamically populates pages with content on the browser.

Familiar with two different methods for paging (referenced here: ):

1) Utilizing .skip() + .limit()

2) Implementing

.find({_id > last_id}).limit(n)

Acknowledging the performance challenges associated with the first approach, it was immediately ruled out.

The second method proves to be effective but only when results are sorted by the _id field. Sorting by a non-unique field like Date might exclude some documents due to potential duplicates.

In addition, users must navigate through pages sequentially as a variable such as last_id needs continuous updating based on the _id of the final document on the previous page. Skipping from page 1 to 7 might lead to page 7 displaying results meant for page 2 because the last_id retains the _id value from the last item on page 1.

Hence, the query remains - how can one execute paging when sorting by a non-unique column (e.g., Date or firstName) and facilitate users' ability to jump multiple pages simultaneously?

Any suggestions would be highly valued and appreciated. Thank you!

javascript mongodb mongoose pagination

Answer 1

Answer №1

The advice provided is accurate - it's safe to skip unless you anticipate dealing with a large volume of documents. However, in the event that your application unexpectedly gains immense popularity, it's crucial to ensure that your code remains robust and doesn't break under high user loads.

If you opt to sort by date and then by ID, you can implement the following query:

.find(
  {
    date:{
      $lte:lastDate
    },
    _id:{ 
      $lt: lastId 
    }
  }
).limit(n)

Answer 2

The advice provided is accurate - it's safe to skip unless you anticipate dealing with a large volume of documents. However, in the event that your application unexpectedly gains immense popularity, it's crucial to ensure that your code remains robust and doesn't break under high user loads.

If you opt to sort by date and then by ID, you can implement the following query:

.find(
  {
    date:{
      $lte:lastDate
    },
    _id:{ 
      $lt: lastId 
    }
  }
).limit(n)

Using MongoDB to efficiently paginate results

Answer №1

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