Support serialization of DSL definitions to raw JSON Schema

[jacksmith15]

Problem Statement

Currently, parsing JSONSchema's to DSL objects is supported, but not the other direction. DSL Elements should expose methods which produce the equivalent JSON Schema dictionaries.

Example

class Choice(Object):
    choice_text: str = Property(String(maxLength=200), required=True)
    votes: int = Property(Integer(default=0))

class Poll(Object):
    question: str = Property(String(maxLength=200), required=True)
    choices: List[Choice] = Property(Array(Choice), required=True)

Poll.serialize() == {
  "type": "object",
  "title": "Poll",
  "required": ["question", "choices"],
  "properties": {
    "question": {"type": "string", "maxLength": 200},
    "choices": {
      "type": "array",
      "items": {
        "type": "object",
        "title": "Choice",
        "required": ["choice_text"],
        "properties": {
          "choice_text": {"type": "string", "maxLength": 200},
          "votes": {"type": "integer", "default": 0},
        }
      }
    }
  }
}

Technical notes

Some problem areas will likely include:

• How to manage schemas referenced in multiple places - do we support automatic referencing?
• Ensuring source names are mapped correctly.
• Error handling infinite schemas.
• Testing that the process is invertible against the parser.