How to send array of objects in retrofit multipart request

问题

I want to send array objects with multipart data. I tried many ways but it is not working. My issue with the contributor parameter. Server says. contributor.0.id is required & contributor.0.role is required and so on for remaining items in the list. Server reads that there is a contributor array and it has items but he can't extract it for some reason.

Any help please?

@Multipart
@POST("project/create")
fun createProject(
    @Header("Authorization") token: String,
    @Part("title") title: String,
    @Part img: MultipartBody.Part,
    @Part("release_date") releaseDate: String,
    @Part("contributors[]") contributors: MutableList<Contributor>
): Single<Response<String>>

Class Contributor

class Contributor : Serializable{

@SerializedName("id")
@Expose
var id: Int = 0

@SerializedName("role")
@Expose
var role: String = ""

}

回答1:

Here is the only way worked for me.

First Created Hashmap and mapped my data on this way

val contributorsMap: HashMap<String, String> = HashMap()

    for((index, contributor) in contributorList.withIndex()){

        contributorsMap["contributors[${index}][id]"] = "${contributor.id}"
        contributorsMap["contributors[${index}][role]"] = contributor.role

    }

Then updated my function parameter to @PartMap instead

@Multipart
@POST("project/create")
fun createProject(
    @Header("Authorization") token: String,
    @Part("title") title: String,
    @Part img: MultipartBody.Part,
    @Part("release_date") releaseDate: String,
    @PartMap contributors: HashMap<String, String>,
): Single<Response<String>>

回答2:

Use @Field

@Field("contributors[]") contributors: MutableList<Contributor>

回答3:

You can use @partMap

@PartMap() Map<String, List<Contributor>> contibutors

来源：https://stackoverflow.com/questions/58949477/how-to-send-array-of-objects-in-retrofit-multipart-request

标签

android

kotlin

retrofit

rx-java