validate() doesn't handle required properly.

[sontek]

(Pdb) p params
{u'bar': u'foo'}
(Pdb) p flat_schema
{'type': 'object', 'properties': {'foo': {'required': True, 'type': 'string', 'value': 'bar'}}}
(Pdb) validate(params, flat_schema)
*** SchemaError: True is not of type u'array'

Failed validating u'type' in schema[u'properties'][u'properties'][u'additionalProperties'][u'properties'][u'required']:
    {u'items': {u'type': u'string'},
     u'minItems': 1,
     u'type': u'array',
     u'uniqueItems': True}

On instance[u'properties']['foo'][u'required']:
    True
(Pdb) from jsonschema import Draft4Validator
(Pdb) Draft4Validator(flat_schema).validate(params)

You see, with validate it thinks it needs to validate required as an array. Then if I use Draft4Validator it doesn't check the required flag.

[Julian]

Hey.

In draft 4, required must be an array, and goes topside. You're probably looking at a draft 3 example (jsonschema supports draft 3 but draft 4 is the default when your schema doesn't specify a version).

So:

{
"type": "object",
"properties":{"foo":{"type":"string"}},
"required": ["foo"],
}

And the reason why making a validator does not complain is that validate checks if a schema is valid first while passing a schema to a validator does not.