JSON Schema OneOf Cascading - json

Question

What I am asking myself is if I can cascade multiple 'oneOf' or maybe there is a better way to make my Cases Valid.
I am Trying to validate the following:
Use definition of ObjectA or ObjectB as Single Objects or an Array of a them
Case 1:
Using only definition of ObjectA
{
"X": "test"
}
Case 2:
Using only definition of ObjectB
{
"Y": "test"
}
Case 3:
Using definition of ObjectA or ObjectB in an Array
[
{
"X": "test"
},
{
"Y": "test"
}
]
Case 4:
Using definition of ObjectA twice in an Array
[
{
"X": "test"
},
{
"X": "test"
}
]
Schema:
I tryed using this schema, the IntelliSense of MonacoEditor is working well but I still get the Error/Warning: "Matches multiple schemas when only one must validate."
{
"definitions": {
"objectA": {
"type": "object",
"properties": {
"X": {
type: "string"
}
}
},
"objectB": {
"type": "object",
"properties": {
"Y": {
type: "string"
}
}
}
},
"oneOf":
[
{
"oneOf":
[
{
"$ref": "#definitions/objectA"
},
{
"$ref": "#definitions/objectB"
}
]
},
{
"type": "array",
"items":
{
"oneOf":
[
{
"$ref": "#definitions/objectA"
},
{
"$ref": "#definitions/objectB"
}
]
}
}
]
}
Error/Warning:
"Matches multiple schemas when only one must validate."

Answer 1

The problem is that your X property in objectA and Y property en objectB are not required, so an empty object, that is { }, validates against both.
Also, if you want an array with objectA and objectY to be valid, you need to use anyOf instead of oneOf.
{
"definitions": {
"objectA": {
"type": "object",
"properties": {
"X": {
"type": "string"
}
},
"required": ["X"]
},
"objectB": {
"type": "object",
"properties": {
"Y": {
"type": "string"
}
},
"required": ["Y"]
}
},
"oneOf":
[
{"$ref": "#/definitions/objectA"},
{"$ref": "#/definitions/objectB"},
{
"type": "array",
"minItems": 1,
"items":
{
"anyOf":
[
{"$ref": "#/definitions/objectA"},
{"$ref": "#/definitions/objectB"}
]
}
}
]
}
I added the minItems if you don't want an empty array to validate.