How to add hash containing list in multipart entity?

Question

I need my HTTP params should be

Parameters: {"MainHash"=>{"MyArray"=>[one,two,three]}}

For that I have tried

Try (1)

   for (String item : array_items) {
       entity.addPart("MainHash[MyArray[]]", new   StringBody(item));
   }

Result

Parameters: {"MainHash"=>{"MyArray"=>[nil,nil,nil]}} //nil for each item

Try (2)

entity.addPart("MainHash[MyArray[]]", new   StringBody("["+items_string+"]"));

Result

Parameters: {"MainHash"=>{"MyArray"=>"[one,two,three]"}} //quotes added to array

When I tried it with list with out hash it is working.

But I need to append list inside hash.

Any suggestions on the same are highly appreciated.

Answer 1

I believe you want your MainHash with same key in MainArray.

So, you can try,

 for (String item : array_items) {
   entity.addPart("MainHash[MyArray][]", new   StringBody(item));
 }

It will create,

[one,two,three]    

as an array.