Don't care about the key, but what type its value should be

[barbaragomes]

Hey there,

not sure where to look for the answer so I'm posting it here.
I need to validate a JSON object that can contain any key name, but its value should be of type "string".
So basically I don't care about the key or how many keys I can have, but I must specify that the correspondent value should be a string.

Is there any way to specify that?

Thanks!

[edgarmueller]

Hi,
if I understood you correctly you want to have an object that can contain arbitrary properties but at least one of them (or all?) have to be of type string?

[barbaragomes]

Hi Edgar,

Thanks for the reply.
That is exactly what I'm looking for.
Just to give you an idea:

In this json, the parameters property is an object that can contain any property name (0 or more) but the type of the property must be string for all of them.

{
   "parameters":{
        "propertie1":"value1",
        "propertie2":"value2"
   }
}

For this other example, the edges properties is an array of objects where it must have only one property and the type must be an array of any string

"edges":[
   {"A":["B"]},
   {"B":["C","D","E"]},
   {"D":["F","C"]}
]

Thanks!

[edgarmueller]

I think both cases can be solved by using patternProperties, here's some example code for the first example:

val schema = JsonSource.schemaFromString(
      """{
        |  "properties": {
        |    "parameters": {
        |      "patternProperties": {
        |        ".*": {"type": "string"}
        |      }
        |    }
        |  }
        |}""".stripMargin).get

SchemaValidator.validate(schema,
  Json.obj(
    "parameters" -> Json.obj(
      "param1" -> "bar",
      "param2" -> "foo"
    )
  )
).isSuccess must beTrue

SchemaValidator.validate(schema,
  Json.obj(
    "parameters" -> Json.obj(
      "param1" -> 3,
      "param2" -> "foo"
    )
  )
).isError must beTrue

Your second example is a little bit more complex, but the following schema should cover that use case as well.

{
  "properties": {
    "edges": {
      "items": {
        "patternProperties": {
          ".*": {
            "type": "array",
            "items": { "type": "string" }
          }
        },
        "maxProperties": 1
      }
    }
  }
}

Does this answer your question?

[barbaragomes]

Cool!

That works perfectly.
Thank you very much!
I did not know about the patternProperties.

This is an awesome library. Thank you for open sourcing it.

Regards

[edgarmueller]

Glad I could help, if there's anything else, let me know.