Hello, noob question for ktor and json via GSON (e...

# ktor

[waltermcq]

Hello, noob question for ktor and json via GSON (edit: solved)

[waltermcq]

as per the samples I added GSON for content negotiation

install(ContentNegotiation) {
        gson {
            setDateFormat(DateFormat.LONG)
            setPrettyPrinting()
        }
    }

I created an extension function to catch post requests to an endpoint

fun Route.phrase(db: Repository) {    //db param adheres to repository interface
    post(PHRASE_ENDPOINT) {
        // get request from call, then
        val request = call.receive<Request>()
        // add on db, then
        val phrase = db.add(EmojiPhrase(request.emoji, request.phrase))
        // respond to call, sending back emoji phrase that was added to repository
        println("post: ${phrase.phrase} ${phrase.emoji}}")
        call.respondText("post received", contentType = ContentType.Text.Plain)
    }
}

I made a post request using curl

curl -X POST -H "Content-Type: application/json" -d tmp/request2.json <http://localhost:8080/api/v1/phrase>

this is the json file I am POSTing

{
  "emoji": "1234",
  "phrase": "test"
}

I get a server error when I try this:

java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $%

It looks like this error is coming from the

call.receive<Request>()

call

What am I doing wrong?

[Alejandro Rios]

I think it's about the answer

[Alejandro Rios]

what you should get from that endpoint?

[waltermcq]

Well, in the above code it just responds with the same json that was sent

[waltermcq]

but if I comment out the respond I still get that error

[waltermcq]

so as I said above I think its the >call.receive<Request>()

[Alejandro Rios]

what if you use

call.receiveParameters()

instead

[Alejandro Rios]

aldo, receiveParameters are from web, not sure if you're doing the same

[waltermcq]

Wouldn't parameters here mean what is in the query string? I'm trying to send json data, how would I do that with parameters..?

[Alejandro Rios]

i think you can access params using for example parameters["emoji"] parameters["phrase"]

[waltermcq]

I can do this by POSTing a JSON object?

[Alejandro Rios]

🤔, not sure if you can, you could try

[waltermcq]

I think something is wrong with my curl command and/or the actual JSON file I was trying to send

[waltermcq]

which would explain the error since it is referencing that its expecting a { but is getting "

[waltermcq]

I changed my curl request and now it works!

[waltermcq]

(case closed)

[Alejandro Rios]

Cool, sorry i was offline

[Alejandro Rios]

what was the change with curl ?