Retrofit POST with empty array

Question

I need to send a POST with Retrofit:

Retrofit.Builder()
  .baseUrl(API_BASE_URL)
  .addConverterFactory(
      GsonConverterFactory.create(
          GsonBuilder().serializeNulls().create()
      ))
  .client(okHttpClient)
  .build()

    @POST(endpoint)
    @FormUrlEncoded
    fun partialPickupsDelivery(
            @HeaderMap headers: Map<String, String>,
            @Field("userId") userId: String,
            @Field("purchaseIds[]") purchases: ArrayList<String>
    ): Call<ResponseBody>

The server is waiting something like this: purchaseIds=["1234", "2345", "3456"]

The problem comes when I try to send an empty array (not null) because the server is waiting: purchaseIds=[] But I'm sending only the first param userId (I think retrofit is removing the second one because the array is empty).

Is there any way to send purchaseIds=[]?

Thx

Can you show how this function partialPickupsDelivery is called? — Antonio
– Antonio, Commented May 21, 2020 at 8:52
@Field("purchaseIds[]") this is not the way of calling array. — Rahul Agrawal
– Rahul Agrawal, Commented May 21, 2020 at 8:54
Try this @Field("purchaseIds") purchases = emptyList<String> — Công Hải
– Công Hải, Commented May 21, 2020 at 8:56
service.partialPickupsDelivery( headers, userId, purchaseId ) where headers: Map<String, String> userId: String purchaseIds: ArrayList<String> — David Mendaño
– David Mendaño, Commented May 21, 2020 at 8:57

David Mendaño · Accepted Answer · 2020-05-25 15:16:26Z

1

I finally found a solution that works for me:

@POST(endpoint)
fun partialPickupsDelivery(
   @HeaderMap headers: Map<String, String>,
   @Body params: HashMap<String, Any>
): Call<ResponseBody?>

where params is:

val params = HashMap<String, Any>().apply {
    this["purchaseIds"] = destinationsId
    this["userId"] = deliverId
}

and it's called this way:

val call: Call<ResponseBody> =
      service.partialPickupsDelivery(
          headers,
          params
      )

I hope this can help someone

answered May 25, 2020 at 15:16

David Mendaño

1941 silver badge6 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jassem Ben Hamida · Accepted Answer · 2020-05-21 09:28:58Z

0

you can use List instead of ArrayList

answered May 21, 2020 at 9:28

Jassem Ben Hamida

5242 silver badges8 bronze badges

Collectives™ on Stack Overflow

Retrofit POST with empty array

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related