For instance, we could create a method to find all the people who have the same first name as the current instance. Here we define a property called email with a schema type String which maps to an internal validator that will be triggered when the model is saved to the database. It will fail if the data type of the value is not a string type. Object Mapping between Node and MongoDB managed via MongoDB is a schema-less NoSQL document database. It means you can store JSON documents in it, and the structure of these documents can vary as it is not enforced like SQL databases.
When it comes to schema validation, schwinn bicycles enforces it at the application layer as we’ve seen in the previous section. Download the file populatedb.js inside your express-locallibrary-tutorial directory (in the same level as package.json). For this tutorial, we’re going to use the MongoDB Atlas free cloud-hosted sandbox database.
For complete information on field validation see Validation . // You can also have an array of each of the other types too. A good example is a genre (e.g. fantasy, science fiction, etc.).
Field name and type as a key-value pair (i.e. as done with fields name, binary and living). We know that we need to store information about books and that we might have multiple copies available (with globally unique ids, availability statuses, etc.). We might need to store more information about the author than just their name, and there might be multiple authors with the same or similar names. We want to be able to sort information based on the book title, author, genre, and category.
Cats have a rounder head, pointed ears, longer legs, a flat nose, and usually have a jumping pounce. Large rats run low to the ground, like mongooses, but are usually spotted at night . Pheasants also run with a low profile and since sighting them lasts only seconds, they can easily be mistaken. Mongoose are opportunistic feeders that will eat birds, small mammals, reptiles, insects, fruits, and plants. They prey on the eggs and hatchlings of native ground nesting birds and endangered sea turtles. It was estimated in 1999 that mongoose cause $50 million in damages to Hawai`i and Puerto Rico annually.