We have been using ledgers for a long time to keep track of financial transactions. But with the development of blockchain technology, the traditional ledger has changed a lot. Let’s understand what a ledger means in blockchain and how it…
In today’s world where AI is gaining too much popularity, suppose, you have created a website to show AI-generated articles on tending topics. These articles are stored in a MongoDB collection named “Articles”. Each document has a field “AI” containing…
In our previous tutorial, we learned everything about MongoDB findOneAndUpdate() and findAndModify() methods, but these methods can only update one document at a time and can be suitable for cases like updating a particular post, updating a single user information,…
In MongoDB, two popular methods for updating documents are findOneAndUpdate() and findAndModify(). In this article, we will explain both methods, demonstrate them on different datasets, find the differences and discover which one is best suited for your needs. MongoDB findOneAndUpdate()…
The term “is not null” means that there is some value present, except for null. It can be anything, like an empty string, zero, or any other value but not null. The null values are useless in terms of any…
It’s easy to find documents in a collection in the MongoDB database using methods like find() and findOne(), but when there is a need to find and in the meantime update a document, we have a special method findOneAndUpdate(). This…
In MongoDB, we use arrays to store different types of values like strings, numbers, objects, and even arrays. Now if we want to add a new element to an array present inside the documents, we usually use the $push operator…
If you want to check if a field exists in a collection or filter out documents based on a certain field for either including or excluding them, you can use the $exists operator. Let’s quickly learn about it. MongoDB $exists…
When handling a large database, we generally use operators like $match and $filter to filter selections. However, MongoDB provides a more powerful operator called $elemMatch that can query arrays and embedded documents. Using $elemMatch, we can match specific conditions within…
When developing web applications, we don’t actually build everything from scratch. We may sometimes want to “outsource” certain tasks. For this, we can use APIs from other websites that offer services that we integrate into our application without lifting a…