Mongoose: how to achieve multi-level schema inheritance or compose?

[anlexN]

i have read mongoose document once by once.
Summary:
there are 4 possible solution

• populate
• discriminators
• plugin
• loadClass
  i expect such like this relational schema , inspired by shema.org:

            |
  creativeworkSchema
            |
      ArticleSchema

So, @mongoosejs team, can you explain more much inheritance or compose with shcema?

[lineus]

Hi @anlexN a similar question came up not too long ago and I just recently had the time to look into it. check out this comment for a working example of multi-level schema inheritance using custom SchemaTypes.

[vkarpov15]

@anlexN populate and plugins aren't really a mechanism for inheritance. Discriminators are used if you want to have multiple types of documents in a single collection, but that's a special case of general schema inheritance. IMO the below would be the cleanest way to do generic schema inheritance:

const mongoose = require('mongoose');

class thingSchema extends mongoose.Schema {
  constructor(obj, options) {
    super(obj, options);
    this.add({ test: String });
  }
}

class creativeWorkSchema extends thingSchema {
  constructor(obj, options) {
    super(obj, options);
    this.add({ test2: String });
  }
}

const schema = new creativeWorkSchema();

const Model = mongoose.model('Test', schema);

console.log(new Model({ test: 'abc', test2: 'abc' }));