JSON: Allow null value in reference to object

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How can i allow null values in reference to object?

{
  "type" : "object",
  "properties" : {
    "foreign-key-field" : {
        "type" : ["object", "null" ], 
        "$ref" : "object-schema.json"
    },
  },
  "additionalProperties" : false 
}

This is my schema, but it does not allow me to do that. it throws "Validation error: None is not of type u'object' (at [u'foreign-key-field'])" in validator.

asked 1 min ago

aabele

88

JSON: Allow null value in reference to object