I have the following Json request

{
    "id": "4",
    "imp": [{
        "id": "1",
        "banner": {
            "w": 300,
            "h": 250,
            "mimes": [
                "image/jpg",
                "image/gif",
                "text/html",
                "image/png",
                "image/jpeg",
                "application/javascript"
            ],
            
            "hmin": 250
        }, 
        "bidfloor": 0.01,
        "bidfloorcur": "USD",
    },
    {
        "id": "2",
        "banner": {
            "w": 300,
            "h": 250,
            "mimes": [
                "image/jpg",
                "image/gif",
                "text/html",
                "image/png",
                "image/jpeg",
                "application/javascript"
            ],
            
            "hmin": 250
        }, 
        "bidfloor": 0.033,
        "bidfloorcur": "USD",
    },],
  "tmax": 2000,
}

I want to receive this json request and update some of its field and return it

I tried the following code

def index(conn, params) do
    

    if (!params) do
      Plug.Conn.send_resp(204)
    else
      IO.puts "RRR"
      params=put_in(params["tmax"], params["tmax"]- 20)
      params=put_in(Enum.at(params["imp"],0)["bidfloor"],  Enum.at(params["imp"],0)["bidfloor"]+2)

      Enum.each params["imp"], fn x -> 
        IO.inspect x
        params=put_in(x["bidfloor"],  x["bidfloor"]+20)
      end

      json(conn,  params)
    end

but this line

      params=put_in(Enum.at(params["imp"],0)["bidfloor"],  Enum.at(params["imp"],0)["bidfloor"]+2)

is only returning part of the request (the “imp” part)

what should I do?