const coreApp = lesan();
      const locationPure = {
        name: string(),
        population: number(),
        abb: string(),
      };
      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 getCityMainRelations = coreApp.schemas.getMainRelations("city");
    
  

    
{
  "country": {
    "schemaName": "country",
    "type": "single",
    "optional": false
  }
}