JsonSchema: Validate type based on value of another property

Question

I am using the following schema to validate my json:

{
    \"$schema\": \"http://json-schema.org/schema#\",
    \"title\": \" Rules\",
    \"description\": \         


        

Answer 1

There may be a more concise way to do this, but this will work:

{
  "$schema": "http://json-schema.org/schema#",
  "title": "Rules",
  "description": "Describes a set of rules",
  "definitions": {
    "field": {
      "type": "string",
      "enum": ["Name", "Size"]
    }
  },
  "type": "object",
  "properties": {
    "rules": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "precedence": {
            "type": "number",
            "minimum": 0
          },
          "conditions": {
            "type": "array",
            "items": {
              "type": "object",
              "oneOf": [
                {
                  "properties": {
                    "field": {
                      "$ref": "#/definitions/field"
                    },
                    "relation": {
                      "type": "string",
                      "enum": ["is", "is not"]
                    },
                    "value": {
                      "type": ["string", "number"]
                    }
                  },
                  "required": ["field", "relation", "value"],
                  "additionalProperties": false
                },
                {
                  "properties": {
                    "field": {
                      "$ref": "#/definitions/field"
                    },
                    "relation": {
                      "type": "string",
                      "enum": ["is not one of", "is one of"]
                    },
                    "value": {
                      "type": ["array"]
                    }
                  },
                  "required": ["field", "relation", "value"],
                  "additionalProperties": false
                }
              ]
            }
          }
        },
        "required": ["precedence", "conditions"],
        "additionalProperties": false
      }
    }
  },
  "required": ["rules"],
  "additionalProperties": false
}