How to manage complex schema database with JSON Schema

[Superdev]

When I export a service, I can't export complex schema information into Sequelize or Mongoose schema. Example : relationship information or constraint are ignored, so Sequelize and Mongoose are missing some parameters.

Here I submit a PR to solve a part of this issue for Mongoose : #236
BUT I'm not sure is good solution, so guys, how do you manage this kind of problem ?
There is an example project with complex database schema ?

Steps to reproduce

If you need a relationship like this:

let schema = {
//...  
  properties: {
    //foreign key or ref to another model in order to join or populate
    parentId:  { type: 'ID', ref: 'User' },
  }
}

Expected behavior

You expect something like this :

//sequelize
parent_id: {
   type: Sequelize.INTEGER,
   references: {
     model: User,
     key: 'id',
     deferrable: Sequelize.Deferrable.INITIALLY_IMMEDIATE
   }

//or mongoose
parentId: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "User"
    },

Actual behavior

But actually you get :

//sequelize
parentId: {
      type: DataTypes.INTEGER
    },
//mongoose
parentId:  mongoose.Schema.Types.ObjectId,

System configuration

Module versions (especially the part that's not working):
0.8.3
NodeJS version:
v10

[Eddyystop]

You can add to or overwrite parts of the generated Mongoose schema with a custom object placed in serviceName.mongoose.?s at // !code: moduleExports // !end.

Its better to do this than remove <DEFAULT> on the generated schema and customizing it because the moduleExports way still regenerates the schema if you make any changes to the JSON-schema.