Default values over merged schemas

[burak-koksal-jotform]

Hello,
I'm trying to build a mechanism to versioning default values for my app over ajv backed separated JSON files.

TL; DR:

I couldnt generate default values from a merged schema. Please elaborate on what i'm missing or doing wrong.

Details:

You can find the sandbox here

My concerns are:

• Use default values and validate the data only related props according to the version
• Use v0 as a base JSON and struct upcoming versions via $merge/$patch keywords (Dont repeat unchanged props and definitions)
• Use a separeted common definitions JSON file to feed the base or merged/patched schemas.

A simple example goes like this:

/schemas/v0/App.json:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://some.domain.com/schemas/v0/App.json#",
  "title": "App Schema v0",
  "description": "App Properties",
  "type": "object",
  "additionalProperties": false,
  "definitions": {
    "yesNo": {
      "$ref": "https://some.domain.com/schemas/commonDefinitions.json#/definitions/yesNo"
    },
    "description": {
      "$ref": "https://some.domain.com/schemas/commonDefinitions.json#/definitions/description"
    },
    "color": {
      "$ref": "https://some.domain.com/schemas/commonDefinitions.json#/definitions/color"
    },
    "URL": {
      "$ref": "https://some.domain.com/schemas/commonDefinitions.json#/definitions/color"
    }
  },
  "properties": {
    "appVersion": {
      "type": "string",
      "const": "0",
      "default": "0"
    },
    "appBgColor": {
      "$ref": "#/definitions/color",
      "description": "App bg color",
      "default": "#ffffff"
    },
    "name": {
      "type": "string",
      "default": "New App"
    },
    "description": {
      "$ref": "#/definitions/description",
      "default": "my app"
    },
    "logoURL": {
      "$ref": "#/definitions/URL",
      "description": "Logo asset URL",
      "default": "https://source.unsplash.com/random/50x50"
    }
  },
  "required": ["appVersion"]
}

/schemas/v1/App.json:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://some.domain.com/schemas/v1/App.json#",
  "$merge": {
    "source": {
      "$ref": "https://some.domain.com/schemas/v0/App.json#"
    },
    "with": {
      "properties": {
        "appVersion": {
          "const": "1",
          "default": "1"
        },
        "showItemIcons": {
          "$ref": "#/definitions/yesNo",
          "default": "Nope"
        }
      }
    }
  }
}

/schemas/commonDefinitions.json:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://some.domain.com/schemas/commonDefinitions.json#",
  "title": "App Schema Common Definitions",
  "description": "Common Definitions",
  "type": "object",
  "additionalProperties": false,
  "definitions": {
    "yesNo": {
      "type": "string",
      "enum": ["Yes", "No"]
    },
    "alignment": {
      "type": "string",
      "enum": ["left", "center", "right"]
    },
    "description": {
      "type": "string",
      "maxLength": 5
    },
    "color": {
      "type": "string"
    },
    "URL": {
      "type": "string"
    },
    "empty": {
      "type": "string",
      "maxLength": 0
    }
  }
}

I couldn't make ajv to produce correct data with defaults on v1/App.json:

{}

However it's ok for v0/App.json:

{"appVersion":"0","appBgColor":"#ffffff","name":"New App","description":"my app","logoURL":"https://source.unsplash.com/random/50x50"}

Additional problems:

• It seems validation ignore default values. See v0/App.json#properties.description shouldn't exceed 5 length value. But validator tells it's valid for 'my app'.
• I couldn't make codesandbox work by referencing relatively within schemas. Is it ok to access other schemas as:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://www.jotform.com/portal/schemas/v1/App.json#",
  "$merge": {
    "source": {
      "$ref": "../v0/App.json"
    },
    "with": {
      ......
    }
}

• And finally please see that i need 'yesNo' definition starting from v1. However it seems it needs to be defined in also v0. I got MissingRefErrors if i dont include it to v0. What is the correct way to extend definitions and required?