Savon 3 distinguishing between required and optional elements

[DavidB]

Per the documentation for the operation.example_body method:

This looks at the parts defined for the SOAP body and returns a Hash that follows the structure expected by Savon (needs to be formalized) to call the operation. Keys are matching parameter-/ element-names and values indicate the simple types. Currently this Hash contains both required and optional elements without a good way to indicate what's required and what's not. If you can think of a nice way to accomplish this, please let me know.

I like the idea of returning a clean hash for this, without meta-keys like attributes! to define additional information.

What I'd like to see as a solution for this would be something like subclassing the Hash class as, for example, HashWithSavonData, which could include the required_parameters? and optional_parameters? methods, for usage as below.

 > body = operation.example_body
=>  {
      updateStatus: {
        accountID: 'string',
        accountStatus: 'string'
      }
      openCase: {
        accountID: 'string',
        subject: 'string',
        message: 'string'
      }
    }

 > body[:openCase].required_parameters?
=> [:accountID, :message]

 > body[:openCase].optional_parameters?
=> [:subject]