const cities = coreApp.odm.newModel("city", locationPure, {
  country: {
    schemaName: "country",
    type: "single",
    optional: false,
    relatedRelations: {
      cities: {
        type: "multiple",
        limit: 5,
        sort: {
          field: "_id",
          order: "asc",
        },
      },
    },
  },
});
      
const getCityPureFromMainRelations = coreApp.schemas.getPureFromMainRelations("city");
    
  

    
{
  "country": {
    "type": "object",
    "schema": {
      "_id": {
        "type": "union",
        "schema": null
      },
      "name": {
        "type": "string",
        "schema": null
      },
      "population": {
        "type": "number",
        "schema": null
      },
      "abb": {
        "type": "string",
        "schema": null
      }
    }
  }
}