setReference doesn't add a $ref to models?

Hey everybody,

So my issue is that when modifying a swagger.json file, when I try to add a definition with it's own model,
When I create my own model and try to set a reference to it, it seems to work. However, when I get the output from the swagger file with the .yaml output the reference isn't there at all.

My code is something like this

    swaggerDefs = swagger.getDefinitions();
    ModelImpl model2 = new ModelImpl();
    model2.description("Placeholder");
    model2.setFormat("");
    model2.setType("object");
    model2.setReference("#/definitions/example");

    swaggerDefs.put("ex2, model2);

where swagger is the swaggerobj created from reading a swagger.json file.

I get an output like so in my yaml file with the reference not showing up.

ex2:
type: object
format: ""
description: PlaceHolder.

Is there something I'm doing wrong? Or is outputting the set reference broken?

Thank you.

Reproduce the example by reading swagger.json, creating a ModelImpl, calling setReference("#/definitions/example"), and serializing the result to YAML. Start at the getDefinitions/ModelImpl path involved in YAML output and compare the stored model with the emitted definition. Done means the ex2 definition preserves the expected $ref, or the issue is clarified with the observed limitation.