[NODE-SERVER] Should generate multiple examples of same type

Description

NodeJS Server stub does not generate multiple entries for the same type when the reference type is placed at the same level. In such cases, codegen will only generate the stub for the first case.

Swagger-codegen version

2.2.1

Swagger declaration file content or url

The following swagger definition extract should produce a TransportVehicle json for airplanes, boats and cars.

                "airplanes": {
                    "type": "array",
                    "items": {
                        "$ref": "#/definitions/TransportVehicle"
                    }
                },
                "boats": {
                    "type": "array",
                    "items": {
                        "$ref": "#/definitions/TransportVehicle"
                    }
                },
                "cars": {
                    "type": "array",
                    "items": {
                        "$ref": "#/definitions/TransportVehicle"
                    }
                }

When executed we get:

"airplanes": [ {
  "name" : "abcdef",
  "description": "abcdef"
} ],
"boats": [
  ""
],
"cars": [
  ""
]

Command line used for generation

java -jar swagger-codegen-cli.jar generate -i swagger.json -l nodejs-server -o stub

Steps to reproduce

Create a swagger endpoint with more than one variable reference to the same type at the same field level. Generate stub using command above.

Related issues

None found.

Suggest a Fix

The issue seems to be in the mechanism used to prevent reference type recursion in ExampleGenerator.

This is not just preventing recursion, its also preventing other instances of the same type from being generated.

Start in modules/swagger-codegen/src/main/java/io/swagger/codegen/examples/ExampleGenerator.java around lines 137-139, where reference recursion is prevented. Reproduce with the supplied Swagger definition and the nodejs-server generation command. Done means airplanes, boats, and cars each receive a generated TransportVehicle example instead of empty entries.