How to make post with data class

Question

I have this endpoint with this structure:

uri = http://127.0.0.1:9090/tables/mask

and this payload:

{
   "_id" : "5d66c9b6d5ccf30bd5b6b541",
   "connectionId" : "1967c072-b5cf-4e9e-1c92-c2b49eb771c4",
   "name" : "Customer",
   "columns" : [
       {
           "name" : "FirstName",
           "mask" : true
       },
       {
           "name" : "LastName",
           "mask" : false
       },
       {
           "name" : "City",
           "mask" : false
       },
       {
           "name" : "Phone",
           "mask" : false
       }
   ],
   "parentId" : null
}

in my Kotlin code I have this structure to deserialize:

data class ColumnsMaskModel (val name:String, val mask:Boolean )

data class TablesMaskModel (val _id:String, val name:String, val connectionId:String, val columns:MutableList<ColumnsMaskModel?> )

and how can I use TablesMaskModel to make a HTTP post in Kotlin

madhead · Accepted Answer · 2019-10-11 08:19:36Z

You'll need an HTTP client to do that. Data classes themselves has nothing to do with HTTP, they are just data structures. There are a lot of HTTP clients available on Kotlin for JVM:

Let's see how to make HTTP requests in Ktor:

data class ColumnsMaskModel(val name: String, val mask: Boolean)

data class TablesMaskModel(val _id: String, val name: String, val connectionId: String, val columns: MutableList<ColumnsMaskModel?>)

fun main() = runBlocking {
    val client = HttpClient {
        install(JsonFeature) {
            serializer = JacksonSerializer()
        }
    }

    val result = client.post<String> {
        url("http://httpbin.org/post")
        contentType(ContentType.Application.Json)
        body = TablesMaskModel(
            _id = "5d66c9b6d5ccf30bd5b6b541",
            connectionId = "1967c072-b5cf-4e9e-1c92-c2b49eb771c4",
            name = "Customer",
            columns = mutableListOf(
                ColumnsMaskModel(name = "FirstName", mask = true),
                ColumnsMaskModel(name = "LastName", mask = false),
                ColumnsMaskModel(name = "City", mask = false),
                ColumnsMaskModel(name = "Phone", mask = false)
            )
        )
    }

    println(result)

    client.close()
}

Note that Ktor uses suspending functions for HTTP requests, so you'll need a coroutine scope, runBlocking in this example.

Ktor supports various "backends" for HTTP clients – Apache, Coroutines IO, curl. It also has different "features" to enable on-the-flight payloads serializations and de-serializations, like in the example above.

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