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Swagger Play2 Module


This is a module to support the play2 framework from playframework. It is written in scala but can be used with either java or scala-based play2 applications.

To build from source

The play2 module is currently not available in a maven repo or the playframework modules. To use it, you'll have to build it from source, which is done by following these steps:

cd modules/swagger-play2

sbt play

That will put the swagger-play2 module in your local ivy repository for use in your play2 application. Now you just need to include it in your application like this:

val appDependencies: Seq[sbt.ModuleID] = Seq("com.wordnik" %% "swagger-play2" % "1.1-SNAPSHOT")

You can then add swagger support to your app.

Adding Swagger to your Play2 app

There are just a couple steps to integrate your Play2 app with swagger.

  1. Add the resource listing to your routes file (you can read more about the resource listing here

GET     /resources.json                         controllers.ApiHelpController.getResources

  1. Annotate your REST endpoints with Swagger annotations. This allows the Swagger framework to create the api-declaration automatically!

In your controller for, say your "pet" resource:

  @ApiOperation(value = "Find pet by ID", notes = "Returns a pet when ID < 10. " +
    "ID > 10 or nonintegers will simulate API error conditions", responseClass = "Pet", httpMethod = "GET")
    new ApiParamImplicit(name = "id", value = "ID of pet that needs to be fetched", required = true, dataType = "String", paramType = "path",
      allowableValues = "range[0,10]")))
    new ApiError(code = 400, reason = "Invalid ID supplied"),
    new ApiError(code = 404, reason = "Pet not found")))
  def getPetById(id: String) = Action { implicit request =>
    petData.getPetbyId(getLong(0, 100000, 0, id)) match {
      case Some(pet) => JsonResponse(pet)
      case _ => JsonResponse(new value.ApiResponse(404, "Pet not found"), 404)

What this does is the following:

  • Tells swagger that this API listens to /{id}

  • Describes the operation as a GET with the documentation Find pet by Id with more detailed notes Returns a pet ....

  • Takes the "implicit" param id, which is a datatype String and a path param, and allowableValues as a number between 0 and 10

  • Returns error codes 400 and 404, with the messages provided

In the routes file, you then wire this api as follows:

GET     /pet.json            controllers.ApiHelpController.getResource(path = "/pet")

GET     /pet.json/:id        controllers.PetApiController.getPetById(id)

This will "attach" the /pet.json api to the swagger resource listing, and the method to the getPetById method above

The ApiParam annotation

Swagger for play has two types of ApiParams--they are ApiParam and ApiParamImplicit. The distinction is that some paramaters (variables) are passed to the method implicitly by the framework. ALL body parameters need to be described with ApiParamImplicit annotations. If they are queryParams or pathParams, you can use ApiParam annotations.

Sample Application

Please take a look here for a full sample application using the Swagger Play2 module.

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