hi I am trying to do a redirect like this (using `...

# ktor

[Rohan Maity]

hi
I am trying to do a redirect like this (using ktor-server-resources)

suspend fun ApplicationCall.redirect(resource: Any) {
    val path = application.href(resource)
    respondRedirect(path)
}

And here is the file where redirect is used

const val PHRASES = "/phrases"

@Serializable
@Resource(PHRASES)
class Phrases

fun Route.phrases(db: Repository) {
    authenticate("auth") {
        get<Phrases> {
            val user = call.authentication.principal as User
            val phrases = db.phrases().toTypedArray()
            call.respond(
                FreeMarkerContent(
                    "phrases.ftl",
                    mapOf("phrases" to phrases, "displayName" to user.displayName)
                )
            )
        }

        post<Phrases> {
            val params = call.receiveParameters()
            val action = params["action"] ?: throw IllegalArgumentException("Missing parameter: action")
            when(action) {
                "delete" -> {
                    val id = params["id"] ?: throw IllegalArgumentException("Missing parameter: id")
                    db.remove(id)
                }
                "add" -> {
                    val emoji = params["emoji"] ?: throw IllegalArgumentException("Missing parameter: emoji")
                    val phrase = params["phrase"] ?: throw IllegalArgumentException("Missing parameter: phrase")
                    db.add(EmojiPhrase(emoji, phrase))
                }
            }
            call.redirect(Phrases)
        }
    }
}

Initial page loads fine
But on redirect it fails
on browser console I see this 405 error

Now I am not sure what is wrong here


Update
Actually on further checking its POST method which is not working
I am not sure what's wrong
when I simply use post(StringUrl) it works but when server-resources it does not work


Solved
It was the issue of imports, I used the <http://server.routing.post|server.routing.post> instead of <http://server.resources.post|server.resources.post>
When using server-resources plugin in ktor, one needs to use HTTP methods from server.resources package and not from server.routing package

Thanks @Aleksei Tirman [JB] helping me here

[Aleksei Tirman [JB]]

Firstly, the kotlinx.serialization framework cannot serialize objects of Any type so you need to have a refied type parameter in the redirect method:

suspend inline fun <reified T: Any> ApplicationCall.redirect(resource: T) {
    val path = application.href(resource)
    respondRedirect(path)
}

Secondly, you have to instantiate your resource in the POST route to make a redirect:

post<Phrases> {
    // ...
    call.redirect(Phrases())
}

[Aleksei Tirman [JB]]

Also, there are some problems with imports generated by IntelliJ IDEA,

[Rohan Maity]

I have fixed these things
But POST method errors still persists

[Rohan Maity]

Also, there are some problems with imports generated by IntelliJ IDEA,

Can you please explain this?

[Aleksei Tirman [JB]]

Could you please share your imports (import statements) ?

[Rohan Maity]

here is whole file

[Rohan Maity]

package com.raywenderlich.webapp

import com.raywenderlich.model.EmojiPhrase
import com.raywenderlich.model.User
import com.raywenderlich.redirect
import com.raywenderlich.repository.Repository
import io.ktor.resources.*
import io.ktor.server.application.*
import io.ktor.server.auth.*
import io.ktor.server.freemarker.*
import io.ktor.server.request.*
import io.ktor.server.resources.*
import io.ktor.server.response.*
import io.ktor.server.routing.*
import <http://io.ktor.server.routing.post|io.ktor.server.routing.post>
import kotlinx.serialization.Serializable

const val PHRASES = "/phrases"

@Serializable
@Resource(PHRASES)
class Phrases

fun Route.phrases(db: Repository) {
    authenticate("auth") {
        get<Phrases> {
            val user = call.authentication.principal as User
            val phrases = db.phrases().toTypedArray()
            call.respond(
                FreeMarkerContent(
                    "phrases.ftl",
                    mapOf("phrases" to phrases, "displayName" to user.displayName)
                )
            )
        }

        post<Phrases> {
            println("Path $it")
            val params = call.receiveParameters()
            val action = params["action"] ?: throw IllegalArgumentException("Missing parameter: action")
            when(action) {
                "delete" -> {
                    val id = params["id"] ?: throw IllegalArgumentException("Missing parameter: id")
                    db.remove(id)
                }
                "add" -> {
                    val emoji = params["emoji"] ?: throw IllegalArgumentException("Missing parameter: emoji")
                    val phrase = params["phrase"] ?: throw IllegalArgumentException("Missing parameter: phrase")
                    db.add(EmojiPhrase(emoji, phrase))
                }
            }
            call.redirect(Phrases())
        }
    }
}

[Aleksei Tirman [JB]]

Please replace import <http://io.ktor.server.routing.post|io.ktor.server.routing.post> with import <http://io.ktor.server.resources.post|io.ktor.server.resources.post>

[Rohan Maity]

It worked thanks. I was under the impression Post method of routing will handle the resources

[Rohan Maity]

I think I should avoid wildcard imports it confused alot TBH

[Rohan Maity]

Thank you so much @Aleksei Tirman [JB]