code: function (optionModel, key, model) {
          return optionModel ? (strTo(optionModel, model, Model) || model) : strTo(key, model, Model) || model;
      }
docs: Utility function used by FormView to determine what model the options object should use. Looks to see if options.model is already a Backbone Model, but if its a string, tries to find sub model of the parent model. If that doesn't work, uses the parent model. If the options doesn't specify a model to use, then we do the same thing with the schema key (the field key)