<How to send custom array of objects with post bod...

# stackoverflow

[user]

How to send custom array of objects with post body?
There is data classes PlaylistInsertOperation, TrackId and function insertTracks via Retrofit Interface.
data class PlaylistInsertOperation(
val tracks: List,
)

data class TrackId(
val id: String,
val albumId: String
)

@FormUrlEncoded
@POST("/patch")
suspend fun insertTracks(
@Field("diff") diff: List
): PlaylistResponse

When I send request, field diff equals the next string
diff=PlaylistInsertOperation(tracks=[TrackId(id=39117009, albumId=5034819), TrackId(id=89341636,...