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object CoproductEncoding

This object contains the options for how to encode coproduct JSON schemas.

The following Scala coproduct is the candidate example. Each encoding option includes the schema that it would generate for that example.

sealed trait Pet
case class Cat(name: String) extends Pet
case class Lizard(lovesRocks: Boolean) extends Pet
Source
JsonSchemas.scala
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  19. case object OneOf extends CoproductEncoding with Product with Serializable

    Strategy defining the base type schema in terms of oneOf and the variant schemas.

    Strategy defining the base type schema in terms of oneOf and the variant schemas. The variants themselves don't refer to the base type, but they do include the discriminator field.

    • simpler looking schemas in Swagger UI
    • some OpenAPI clients don't handle oneOf properly

    Using the Pet example above, this strategy yields the following:

    "schemas": {
  "Pet": {
    "oneOf": [
      { "$ref": "#/components/schemas/Cat" },
      { "$ref": "#/components/schemas/Lizard" }
    ],
    "discriminator": {
      "propertyName": "type",
      "mapping": {
        "Cat": "#/components/schemas/Cat",
        "Lizard": "#/components/schemas/Lizard"
      }
    }
  },

  "Cat": {
    "type": "object",
    "properties": {
      "type": {
        "type": "string",
        "enum": [ "Cat" ]
      },
      "name": {
        "type": "string"
      }
    },
    "required": [
      "type",
      "name"
    ]
  },

  "Lizard": {
    "type": "object",
    "properties": {
      "type": {
        "type": "string",
        "enum": [ "Lizard" ]
      },
      "lovesRocks": {
        "type": "boolean"
      }
    },
    "required": [
      "type",
      "lovesRocks"
    ]
  }
}
  20. case object OneOfWithBaseRef extends CoproductEncoding with Product with Serializable

    Strategy that extends OneOf so that each variant also refers back to the base type schema using allOf.

    Strategy that extends OneOf so that each variant also refers back to the base type schema using allOf. This approach is sometimes referred to in OpenAPI 3 as a way to model polymorphism.

    • compatible with OpenAPI clients that don't handle oneOf properly
    • more complex schemas in Swagger UI

    Using the Pet example above, this strategy yields the following:

    "schemas": {
  "Pet": {
    "oneOf": [
      { "$ref": "#/components/schemas/Cat" },
      { "$ref": "#/components/schemas/Lizard" }
    ],
    "discriminator": {
      "propertyName": "type",
      "mapping": {
        "Cat": "#/components/schemas/Cat",
        "Lizard": "#/components/schemas/Lizard"
      }
    }
  },

  "Cat": {
    "allOf": [
      { "$ref": "#/components/schemas/Pet" },
      {
        "type": "object",
        "properties": {
          "type": {
            "type": "string",
            "enum": [ "Cat" ]
          },
          "name": {
            "type": "string"
          }
        },
        "required": [
          "type",
          "name"
        ]
      }
    ]
  },

  "Lizard": {
    "allOf": [
      { "$ref": "#/components/schemas/Pet" },
      {
        "type": "object",
        "properties": {
          "type": {
            "type": "string",
            "enum": [ "Lizard" ]
          },
          "lovesRocks": {
            "type": "boolean"
          }
        },
        "required": [
          "type",
          "lovesRocks"
        ]
      }
    ]
  }
}

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