Mongoose Changing Schema Format

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We're rapidly developing an application that's using Mongoose, and our schema's are changing often. I can't seem to figure out the proper way to update a schema for existing documents, without blowing them away and completely re-recreating them from scratch.

I came across http://mongoosejs.com/docs/api.html#schema_Schema-add, which looks to be right. There's little to no documentation on how to actually implement this, making it very hard for someone who is new to MongoDB.

I simply want to add a new field called enabled. My schema definition is:

var sweepstakesSchema = new Schema({
    client_id: {
        type: Schema.Types.ObjectId,
        ref: 'Client',
        index: true
    },
    name: {
        type: String,
        default: 'Sweepstakes',
    },
    design: {
        images: {
            type: [],
            default: []
        },
        elements: {
            type: [],
            default: []
        }
    },
    enabled: {
        type: Boolean,
        default: false
    },
    schedule: {
        start: {
            type: Date, 
            default: Date.now
        },
        end: {
            type: Date,
            default: Date.now
        }
    },
    submissions: {
        type: Number,
        default: 0
    }
});

There's nothing built into Mongoose regarding migrating existing documents to comply with a schema change. You need to do that in your own code, as needed. In a case like the new enabled field, it's probably cleanest to write your code so that it treats a missing enabled field as if it was set to false so you don't have to touch the existing docs.

As far as the schema change itself, you just update your Schema definition as you've shown, but changes like new fields with default values will only affect new documents going forward.

Mongoose Changing Schema Format, We're rapidly developing an application that's using Mongoose, and our schema's are changing often. I can't seem to figure out the proper way  option: id. Mongoose assigns each of your schemas an id virtual getter by default which returns the documents _id field cast to a string, or in the case of ObjectIds, its hexString. If you don't want an id getter added to your schema, you may disable it passing this option at schema construction time.


  db.sweepstakesModel.find( { enabled : { $exists : false } } ).forEach(
   function (doc) {
       doc.enabled = false;
       db.sweepstakesModel.save(doc);
    }
  )

considering your mongoose model name as "sweepstakesModel", This code would add "enabled" field with boolean value "false" to all the pre-existing documents in your collection.

Mongoose v5.9.10: Schemas, For example, we've defined a property title which will be cast to the String To use our schema definition, we need to convert our blogSchema into a Model we  To migrate the data between the two schemas we can use the same approach as in the relational example from above: write a migration script to convert the data from the old to the new schema. We don't really have to do a schema change, but we do need to update each document.


I was also searching for something like migrations, but didn't find it. As an alternative you could use defaults. If a key has a default and the key doesn't exist, it will use the default.

Mongoose Defaults

Default values are applied when the document skeleton is constructed. This means that if you create a new document (new MyModel) or if you find an existing document (MyModel.findById), both will have defaults provided that a certain key is missing.

Mongoose Changing Schema Format - node.js - html, We're rapidly developing an application that's using Mongoose, and our schema's are changing often. I can't seem to figure out the proper way to update a  You can think of a Mongoose schema as the configuration object for a Mongoose model. A SchemaType is then a configuration object for an individual property. A SchemaType says what type a given path should have, whether it has any getters/setters, and what values are valid for that path.


I had the exact same issue, and found that using findOneAndUpdate() rather than calling save allowed us to update the schema file, without having to delete all the old documents first.

I can post a code snippet if requested.

Have to change schema in production, In MongoDB, we don't have to change schema, right? The Mongoose Node.js framework you are using includes a For example: db. When a schema is passed to mongoose.model() the init event will be emitted on the schema, passing in the model. This is helpful for some plugins that need to hook directly into the model. This is helpful for some plugins that need to hook directly into the model.


Mongoose models and ever changing schema. : node, This project will have datasets/schema that will change a lot over time. blob" design pattern works for you, then hell, you could just use Postgres? The main thing that sets Mongoose apart from other Mongo node libraries is the schemas. First, Mongoose looks for a valueOf() function on the given object, and calls valueOf() before casting the date. This means Mongoose can cast moment objects to dates automatically. const moment = require ( 'moment' ); const user = new User({ name: 'Jean-Luc Picard' , lastActiveAt: moment.utc( '2002-12-09' ) }); user.lastActiveAt; // "2002-12-09T00:00:00.000Z"


The Drastic Mistake Of Using Mongoose To Handle Your Big Data, Mongoose is an incredibly popular and well-done library in the NPM universe. in traditional formats that one requires a different method of thinking and change the Schema-Model for that collection to include the changes. Mongoose schema to JSON schema and back. Motivation. This library represents a practical approach to convert the schemas used in a Mongoose model so that they can conveyed to hypermedia clients that interact with the web service.


Introduction to Mongoose for MongoDB, model provides an interface to the database for creating, querying, updating, deleting records, etc. GeoJSON is a format for storing geographic points and polygons. MongoDB has excellent support for geospatial queries on GeoJSON objects. Let's take a look at how you can use Mongoose to store and query GeoJSON objects. Point Schema. The most simple structure in GeoJSON is a point.