[FIXED] Java Json map object child as id

Issue

I am creating a JSON mapper that will create JSON schema for my JPA database classes. I am using mbknor-jackson-jsonSchema that works great, but I need to serialize my subclasses as id only.

So far my structure is:

public class ModelPojo{
    private List<Table> table;
    private List<Table2> table2;
}

Both table classes look similar to this:

@Table(name = "TABLE")
public class Table extends BaseEntity {
    @Column(name = "SMTH")
    private String smth;

    @JoinColumn(name = "TABLE2")
    private Table2 table2;   //now this is where is the problem

}

BaseEntity contains integer id field.

The question is, is there a way to write custom std serializer that serializes table entity to have property id_table2: "integer", but not the whole object?

I tried to override serialize method for StdSerializer<BaseEntity> which does not work, it is not called when creating the schema

Edit: I now get

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "Model Pojo",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "Table": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Table"
      }
    }
    "Table2": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Table2"
      }
    }
  },
  "definitions": {
    "Table": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "id": {
          "type": "integer"
        },
        "table2": {
          "$ref": "#/definitions/Table2"
        },
        "smth": {
          "type": "string"
        }
      }
    },
    "Table2": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "id": {
          "type": "integer"
        },
        "foo": {
          "type": "string"
        }
      }
    }
  }
}

and i want to change

"table2": {
          "$ref": "#/definitions/Table2"
        },

to

"table2_id": {
              "type": "integer"
            },

The structure of joined tables is much more complex, so I am trying to not manually add @JsonIgnore and changing it manually, but write some type of serializer that retypes the child instances of BaseEntity to id, hope it's understandable.

Solution

I made some changes, I changed JSON serialization framework to victools/jsonschema-generator, which allowed me to heavily modify its serialization

I then serialized with customDefinitionProvider. It helped me to change JsonNode names and most importantly I could chose what I want to serialize through code not via Json tags.

Thanks @Carsten for great work :)

Answered By - konselik
Answer Checked By - David Marino (JavaFixing Volunteer)