polymorph3.py

import jsonschema
import yaml

schema1 = yaml.safe_load("""
title: SCHEMA 1 (foo_node or bar_node)
$ref: '#/definitions/root_node'
$schema: http://json-schema.org/draft-07/schema#
definitions:
  bar_node:
    additionalProperties: false
    properties:
      type: {const: bar}
      flavor: {type: string}
    required: [flavor]
    type: object
  foo_node:
    additionalProperties: false
    properties:
      type: {const: foo}
      color: {type: string}
    required: [color]
    type: object
  root_node:
    allOf:
    - if:
        properties:
          type: {const: foo}
      then: {$ref: '#/definitions/foo_node'}
    - if:
        properties:
          type: {const: bar}
      then: {$ref: '#/definitions/bar_node'}
    properties:
      type:
        enum: [foo, bar]
    required: [type]
""")

data = yaml.safe_load("""
item1: 
  type: bar
  flavor: yummy
item2:
  type: foo
  color: red
item3:
  type: foo
  color: 0
item4:
  type: foo
  color: red
  zipcode: 12345
""")

print("jsonschema version: %s" % jsonschema.__version__)
for k in sorted(data.keys()):
    v = data[k]
    try:
      jsonschema.validate(instance=v, schema=schema1)
      print("%s: success" % k)
    except jsonschema.exceptions.ValidationError, e:
      print("=====\n%s: failure\nmessage: %s\npath: %s\nabsolute_schema_path: %s\n%s" % 
            (k,e.message,list(e.path),list(e.absolute_schema_path),e)
           )