What is the process by which MongoDB dynamically generates databases and collections?

Question

What is the process by which MongoDB dynamically generates databases and collections?

One interesting feature of Mongodb is its ability to create a database/collection on the fly by simply running a code like this:

db.store.save({a: 789});

When executing this code, Mongodb automatically creates the store collection and adds a document to it without any explicit setup.

According to my understanding of JavaScript, calling a method on an undefined property of the db object should result in an error or exception. However, that doesn't seem to be the case with Mongodb's dynamic creation of collections.

I am intrigued by the inner workings of this process and would appreciate any helpful links or resources for further exploration. My attempts at Googling for information have not yielded much insight so far.

javascript mongodb

Answer 1

Answer №1

If you're working with JavaScript, there's a unique method to define a function that triggers when an undefined method is called.

For instance:

var obj = {
  __noSuchMethod__: function(method, args) { console.log(method, '(' + args.join(', ') + ')'); }
};

obj.foo(1, 2, 3);
obj.bar(4, 5);
obj.baz();

// Output
// foo (1, 2, 3)
// bar (4, 5)
// baz ()

Keep in mind that this feature is not standard and currently only functional in Firefox.

I'm not familiar with the implementation of this feature in MongoDB, but I'm mentioning it as a possibility.

For further insights, check: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/noSuchMethod

Answer 2

If you're working with JavaScript, there's a unique method to define a function that triggers when an undefined method is called.

For instance:

var obj = {
  __noSuchMethod__: function(method, args) { console.log(method, '(' + args.join(', ') + ')'); }
};

obj.foo(1, 2, 3);
obj.bar(4, 5);
obj.baz();

// Output
// foo (1, 2, 3)
// bar (4, 5)
// baz ()

Keep in mind that this feature is not standard and currently only functional in Firefox.

I'm not familiar with the implementation of this feature in MongoDB, but I'm mentioning it as a possibility.

For further insights, check: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/noSuchMethod

Answer 3

Answer №2

If I remember correctly, when working in a NodeJS environment, you typically need to use syntax like this to create a record:

db.get('collectionName').insert({..something...});

or

db.get('collectionName').save({...something...});

. It's important to note that you can't directly access the collection name as a property of db.

The line you're referring to is specific to MongoDB shell, which isn't actually Javascript. It seems there may be some confusion between MongoDB shell and a MongoDB driver.

In short, the MongoDB driver won't be able to access an undefined property.

EDIT

In response to your comment..

The MongoDB JS driver's GitHub page provides guidance on how to insert a field using the syntax I mentioned: https://github.com/mongodb/node-mongodb-native

It's worth noting that the shell usage you are referencing doesn't involve standard Javascript commands. To better understand the language used with MongoDB, you can visit their official site: , where it mentions the system being developed in C++.

I hope this explanation clarifies your question.

Answer 4

If I remember correctly, when working in a NodeJS environment, you typically need to use syntax like this to create a record:

db.get('collectionName').insert({..something...});

or

db.get('collectionName').save({...something...});

. It's important to note that you can't directly access the collection name as a property of db.

The line you're referring to is specific to MongoDB shell, which isn't actually Javascript. It seems there may be some confusion between MongoDB shell and a MongoDB driver.

In short, the MongoDB driver won't be able to access an undefined property.

EDIT

In response to your comment..

The MongoDB JS driver's GitHub page provides guidance on how to insert a field using the syntax I mentioned: https://github.com/mongodb/node-mongodb-native

It's worth noting that the shell usage you are referencing doesn't involve standard Javascript commands. To better understand the language used with MongoDB, you can visit their official site: , where it mentions the system being developed in C++.

I hope this explanation clarifies your question.

What is the process by which MongoDB dynamically generates databases and collections?

Answer №1

Answer №2

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