Python: jsonschema package to validate schema and custom error messages

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Given this schema:

{
    "type": "object",
    "properties": {
        "account": {
            "type": "object",
            "required": ["id"],
            "properties": {
                "id": {"type": "number"}
            }
        },
        "name": {"type": "string"},
        "trigger": {
            "type": "object",
            "required": ["type"],
            "properties": {
                "type": {"type": "string"}
            }
        },
        "content": {
            "type": "object",
            "properties": {
                "emails": {
                    "type": "array",
                    "minItems": 1,
                    "items": {
                        "type": "object",
                        "required": ["fromEmail","subject"],
                        "properties": {
                            "fromEmail": {"type": "string", "format": "email"},
                            "subject": {"type": "string"}
                        }
                    }
                }
            }
        }
    }
}

I am trying to use jsonschema.validate to validate a POSTed JSON object to check for validity, but I am having some issues trying to come up with better human readable messages from the returned errors.

Here is how I am validating:

from jsonschema import Draft4Validator

v = Draft4Validator(self.schema)
errors = sorted(v.iter_errors(autoresponder_workflow), key=lambda e: e.path)

if errors:
    print(', '.join(
        '%s %s %s' % (error.path.popleft(), error.path.pop(), error.message) for error in errors
    ))

The error message looks like:

content emails [] is too short, trigger type None is not of type u'string'

Im trying to create an error message that looks a little more like Please add at least one email to your workflow," "Please ensure that all of your emails contain subject lines,", etc

asked 48 secs ago

dennismonsewicz

4,557

Python: jsonschema package to validate schema and custom error messages