aspnetcore/src/MusicStore.Spa/Infrastructure/ApiResult.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.ModelBinding;
using Newtonsoft.Json;

namespace Microsoft.AspNet.Mvc
{
    public class ApiResult : ActionResult
    {
        public ApiResult(ModelStateDictionary modelState)
            : this()
        {
            if (modelState.Any(m => m.Value.Errors.Count > 0))
            {
                StatusCode = 400;
                Message = "The model submitted was invalid. Please correct the specified errors and try again.";
                ModelErrors = modelState
                    .SelectMany(m => m.Value.Errors.Select(me => new ModelError
                        {
                            FieldName = m.Key,
                            ErrorMessage = me.ErrorMessage
                        }));
            }
        }

        public ApiResult()
        {
            
        }

        [JsonIgnore]
        public int? StatusCode { get; set; }
        
        public string Message { get; set; }

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
        public object Data { get; set; }

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
        public IEnumerable<ModelError> ModelErrors { get; set; }

        public override void ExecuteResult(ActionContext context)
        {
            var json = new SmartJsonResult
            {
                StatusCode = StatusCode,
                Data = this
            };
            json.ExecuteResult(context);
        }

        public class ModelError
        {
            public string FieldName { get; set; }

            public string ErrorMessage { get; set; }
        }
    }
}