Symbol keys are not supported in objects within arrays

[jamiecobbett]

If you supply a data object which contains an array of objects with symbol keys, they are treated as being absent.

require 'json-schema'

schema = {
  "type" => 'object',
  "properties" => {
    "a" => {
      "type" => "array",
      "items" => {
        "properties" => {
          "awesomeness" => {
            "type" => "integer"
          }
        }
      }
    }
  }
}

data = {
  a: [
    {
      awesomeness: 1
    }
  ]
}

errors = JSON::Validator.fully_validate(schema, data)
if errors.any?
  puts 'Invalid:'
  p errors
else
  puts 'Valid'
end

This returns:

["The property '#/a/0/awesomeness' of type NilClass did not match the following type: integer in schema f092eaf2-bbef-50c6-8955-9cc93e53bbb6#"]

I believe this is the same bug as #101 and #94.

There were changes last year to address equivalent problems: 0146e33. The fix isn't obvious to us, but we are happy to provide a fix with test given a pointer to the problem.