Null is equal to string-CodePudding

Im using Angular ts.

My request looks like:

getOrders(this.value.id, null, null).subscribe((s) => {
  this.ordersArray = s
})

For some reason. null is converted to "null" on the server, what could be the reason for this?

backend console

    Started GET "/admin/api/as_supplier/orders.json?start=null&end=null" for ::1 at 2022-04-19 11:01:32  0300
Processing by Admin::Api::AsSupplier::OrdersController#index as JSON
  Parameters: {"start"=>"null", "end"=>"null"}
Completed 500 Internal Server Error in 30ms (ActiveRecord: 0.0ms)

Or is the problem not on the frontend, but on the backend?

upd:

 public getOrders(supplierId?: any, start?: any, end?: any): Observable<IOrders>  {
    return this.http
      .get<IOrders>(`${environment.apiUrl}/admin/api/as_supplier/orders.json`, {
        params: {
          start,
          end
        }
      })
      .pipe(tap(response => this.orders = response))
  }

CodePudding user response：

you should do something like this:

let params = new HttpParams();
if (start !== null && start !== undefined) {
    params = params.set('start', start);
}
if (end !== null && end !== undefined) {
    params = params.set('end', end);
}

return this.http.get<IOrders(`${environment.apiUrl}/admin/api/as_supplier/orders.json`, {params})

CodePudding user response：

@Alex i think the problem in your server side, try to parse params before you use it in the rest of your code in API