Trying to update a non-declared field should fail loudly.

[sdeframond]

Given:

class Case < ActiveForce::SObject
  field :id, from: 'Id'
end

kase = Case.find 123

kase.update_attributes! foo: 'bar' # This should fail loudly.

When trying to update an attribute not declared, ActiveForce should fail loudly. Instead it just ignores the parameter, without even sending it to Salesforce API (which would at least complain).

[eloyesp]

It is related to #95 or may be to ActiveModel (I'm not sure if that works the same in Rails).