Apply remove on properties which contains "$ref" doesn't work

[jeremyraffin]

Hello @mavarazy,

Thanks for this useful project.

I'm trying to remove a schema property which contains "$ref" but the schema returned by the function fetchSchema (https://github.com/RxNT/react-jsonschema-form-conditionals/blob/master/src/utils.js#L40) is the "$ref" definition object.

So, the function doRemove (https://github.com/RxNT/react-jsonschema-form-conditionals/blob/master/src/actions/remove.js#L10), breaks.

You can reproduce the error by adding the test in remove.test.js (https://github.com/RxNT/react-jsonschema-form-conditionals/blob/master/test/actions/remove.test.js)

let origSchemaWithRef = {
  definitions: {
    address: {
      properties: {
        street: { type: "string" },
        zip: { type: "string" },
      },
    },
  },
  properties: {
    title: { type: "string" },
    firstName: { type: "string" },
    address: { $ref: "#/definitions/address" },
  },
};

let originUiSchemaWithRef = {
  title: {},
  firstName: {},
  address: {},
};

test("remove field which contains ref", () => {
  let schemaWithRef = deepcopy(origSchemaWithRef);
  let uiSchemaWithRef = deepcopy(originUiSchemaWithRef);
  remove({ field: ["address"] }, schemaWithRef, uiSchemaWithRef);

  let schemaWithoutAddress = {
    definitions: {
      address: {
        properties: {
          street: { type: "string" },
          zip: { type: "string" },
        },
      },
    },
    properties: {
      title: { type: "string" },
      firstName: { type: "string" },
    },
  };

  expect(schemaWithRef).toEqual(schemaWithoutAddress);

  let uiSchemaWithoutAddress = {
    title: {},
    firstName: {},
  };
  expect(uiSchemaWithRef).toEqual(uiSchemaWithoutAddress);

});

Tell me if you need more informations.

[mavarazy]

@jeremyraffin thank you for an exemplary issue example.

I've fixed the problem and it's in a new release.

[jeremyraffin]

@mavarazy It works, thank you for your reactivity.