MongoDB Collections

What’s a collection?

A collection in MongoDB is a group of MongoDB documents. MongoDB stores data as BSON documents. BSON is a binary representation of JSON.

Documents are composed of field-and-value pairs with the following structure: The { field1: value1, field2: value2, field3: value3, ... fieldN: valueN } structure says that a field’s value can contain any of the BSON data types, which includes other documents, arrays, and arrays of documents.

 const personDoc = {
    _id: ObjectId("5099803df3f4948bd75858581"),
    name: { first: "John", last: "Mansa" },
    dob: new Date('Jun 3, 1967'),
    hobbies: [ "Singing", "Playing Chess", "Skating" ],

    address : {
        lga: "Warri",
        state: "Delta",
        country: "Nigeria"
    }      
}

A database can have multiple collections.

Creating a collection in Meteor

A collection in Meteor is created inside the imports folder. Remember that the imports folder is where we place our application code so that it can be lazily loaded by Meteor.