Serializing and deserializing into json

[Matt-84]

Hello, I would like to use this API to save the downloaded content into a file for later use. I was wondering how I could serialize the @RedditModel annotated classes using existing methods into string/json and read it back.

I am sure there must be an easy way for this for the library already does that, I am just unable to find the implementation. Could anyone please help me with this?

[mattbdean]

See the FAQ

[Matt-84]

The Submission class works fine. I thought there would be some convenience functions to serialize the PublicContribution interface.

I tried to serialize this way, but I am skeptical if this is the right way to do:

val user = BotUser
        .redditClient
        .user("* USERNAME *")
        .history("overview")
        .limit(Paginator.RECOMMENDED_MAX_LIMIT)
        .sorting(UserHistorySort.NEW)
        .build()

val elems: Iterator<Listing<PublicContribution<*>>> = user.iterator()
val first = elems.next()

val submissionAdapter = JrawUtils.moshi.adapter(Submission::class.java).serializeNulls()
val commentAdapter = JrawUtils.moshi.adapter(Comment::class.java).serializeNulls()

for (elem in first) {
    when(elem) {
        is Submission -> {
            println("SUBMISSION")
            println(submissionAdapter.toJson(elem))
        }
        is Comment -> {
            println("COMMENT")
            println(commentAdapter.toJson(elem))  // Line 55 is this one
        }
        else -> {
            throw RuntimeException("Not handled!")
        }
    }
}

Though when serializing the Comment class, it finds an unimplemented function:

kotlin.NotImplementedError: An operation is not implemented: not implemented
    at net.dean.jraw.databind.RedditModelAdapterFactory$ListingAdapter.toJson(RedditModelAdapterFactory.kt:212)
    at net.dean.jraw.databind.RedditModelAdapterFactory$ListingAdapter.toJson(RedditModelAdapterFactory.kt:154)
    at net.dean.jraw.databind.RepliesAdapterFactory$RepliesAdapter.toJson(RepliesAdapterFactory.kt:48)
    at net.dean.jraw.databind.RepliesAdapterFactory$RepliesAdapter.toJson(RepliesAdapterFactory.kt:46)
    at net.dean.jraw.models.AutoValue_Comment$MoshiJsonAdapter.toJson(AutoValue_Comment.java:267)
    at net.dean.jraw.models.AutoValue_Comment$MoshiJsonAdapter.toJson(AutoValue_Comment.java:30)
    at com.squareup.moshi.JsonAdapter$1.toJson(JsonAdapter.java:106)
    at com.squareup.moshi.JsonAdapter.toJson(JsonAdapter.java:46)
    at com.squareup.moshi.JsonAdapter.toJson(JsonAdapter.java:52)
    at EntryKt.main(start.kt:55)

I added JRAW to gradle this way:

repositories {
    maven { url 'https://jitpack.io' }
}

dependencies {
    compile 'com.github.mattbdean:JRAW:dbbe319'
}

[mattbdean]

That NotImplementedError your seeing is from here. I'll take a look into it. All models implement Serializable, so you should be able to do something with that for now.

[Matt-84]

Okay, thank you for the answer.

[mattbdean]

Okay so the commit I've just pushed lets you serialize basic Listings, so something like Listing<Comment> or Listing<Submission> (classes that have the @RedditModel annotation) will probably work fine. The issue arises when you try to deserialize something like Listing<PublicContribution>. JRAW does some black magic to deserialize models like that but it's even harder to serialize them. I've closed the issue for now but I may take a swing at it at a later date.