json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "additionalProperties": false,
      "properties": {
          "email": {
              "pattern": "^[\\w|-|.]+@[\\w]+\\.[A-Za-z]{2,4}$",
              "type": "string"
          },
          "firstName": {
              "type": "string"
          },
          "lastName": {
              "type": "string"
          },
          "postedSlides": {
              "type": "boolean"
          },
          "rating": {
              "oneOf": [
                  {
                      "maximum": 2
                  },
                  {
                      "maximum": 5
                  }
              ],
              "type": "number"
          }
      },
      "required": [
          "email",
          "firstName",
          "lastName",
          "postedSlides",
          "rating"
      ],
      "type": "object"
  }