Facebook api passing array param

Question

I want to get places by category by this request:

https://graph.facebook.com/v2.11/search?type=place&center={lat,lng}&categories=["FOOD_BEVERAGE"]

I'm sending categories as query with retrofit as List<String>

But it returns:

{
    "error": {
        "message":"(#100) For field 'placesearch': param categories must be an array.",
        "type":"OAuthException",
        "code":100,
    }
}

I was trying to do this by ArrayList , making this query as String literaly but it still return me that it need an array. How can I pass this ?

EDIT:

Retrofit interface

@GET("search")
fun getPlaces(
       @Query("center") center: String?,
       @Query("access_token") token: String?,
       @Query("type") type: String?,
       @Query("categories") categories: List<String>
): Observable<Places>

Answer 1

You can add a custom converter factory that converts a List<String> into a String of the correct format. Check out this example , instead of an Enum you have a List<String> and at the GetSerializedNameValue() method you would instead use:

value = categories_list.joinToString(
    separator = ", ",
    prefix = "[",
    postfix = "]"
)