Web API返回嵌套的JSON值

Question

我正在使用由web api返回的JSON结构,但是有问题.

说,我有两张桌子,Teams和Players.他们加入了TeamID(PK on Teams and FK on Players).

我希望我的API调用返回一些类似如下的JSON格式:

[
    {
        TeamId: 1,
        TeamName: 'Chicago Bulls',
        TeamPlayers: [
            {PlayerId: 1, PlayerName: 'Pau Gasol'},
            {PlayerId: 2, PlayerName: 'Derrick Rose'},
            {PlayerId: 3, PlayerName: 'Joakim Noah'},
            {PlayerId: 4, PlayerName: 'Jimmy Butler'},
            {PlayerId: 5, PlayerName: 'Taj Gibson'}]
    },
    {
        TeamId: 2,
        TeamName: 'Cleveland Cavaliers',
        TeamPlayers: [
            {PlayerId: 1, PlayerName: 'Lebron James'},
            {PlayerId: 2, PlayerName: 'Kyrie Irving'},
            {PlayerId: 3, PlayerName: 'Anderson Varejao'},
            {PlayerId: 4, PlayerName: 'Dion Waiters'},
            {PlayerId: 5, PlayerName: 'Shawn Marion'}]
    },
    {
        TeamId: 3,
        TeamName: 'Los Angeles Clippers',
        TeamPlayers: [
            {PlayerId: 1, PlayerName: 'Chris Paul'},
            {PlayerId: 2, PlayerName: 'Blake Griffin'},
            {PlayerId: 3, PlayerName: 'DeAndre Jordan'},
            {PlayerId: 4, PlayerName: 'Jamal Crawford'},
            {PlayerId: 5, PlayerName: 'Matt Barnes'}]
    }
]

控制器:

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http;
using System.Web.Http.Description;
using MyApp.Models;

namespace MyApp.Controllers
{
    public class TeamsController : ApiController
    {
        private DataModel db = new DataModel();

        // GET: api/teams
        public IQueryable<TeamsWithPlayers> GetTeamsAndPlayers()
        {
            var query = from x in db.Teams
                        join y in db.Players on x.TeamId equals y.TeamId
                        select
                        {
                            // This is where I need some help...
                        }
        }
    }
}

TeamAndPlayer类:

namespace MyApp.Models
{
    public class TeamAndPlayers
    {
        public int TeamId { get; set; }
        public string TeamName { get; set; }
        public Players players { get; set; }
    }
}

球员类:

namespace MyApp.Models
{
    public class Players 
    {
        public int TeamId { get; set; }
        public int PlayerId { get; set; }
        public string PlayerName { get; set; }
    }
}

有人能提供一些见解吗？

Answer 1

• 我将假设JSON结构是真实的来源,而不是模型(TeamWithPlayers/Players) - 请参阅我的评论.

• 我的解决方案假设您正在使用Entity Framework从数据库中检索数据,因为我使用的是"Include"方法,但可以将其替换为使用"Join".

1-将TeamDto和PlayerDto类定义为:

public class TeamDto
{
    public int TeamId { get; set; }
    public string TeamName { get; set; }
    public IEnumerable<PlayerDto> TeamPlayers { get; set; }
}

public class PlayerDto
{
    public int PlayerId { get; set; }
    public string PlayerName { get; set; }
}

2-你的TeamsController将是这样的:

public class TeamsController : ApiController
{
    private readonly TeamDbContext _dbContext = new TeamDbContext();

    // GET api/teams
    public IEnumerable<TeamDto> GetTeamsAndPlayers()
    {
        var teams = _dbContext
            .Teams
            .Include("Players") // Load the players associated with each Team, (this depends on your declaration, but you mentioned that there is a FK from Player => TeamId)
            // you can use the join if you like or if you don't use entity framework where you cannot call Include, but the following code will stay the same 
            .Select(t => new TeamDto
            {
                TeamId = t.TeamId,
                TeamName = t.TeamName,
                TeamPlayers = t.Players.Select(p => new PlayerDto
                    {
                        PlayerId = p.PlayerId, 
                        PlayerName = p.PlayerName
                    })
            }).ToList();

        return teams;
    }
}

希望有所帮助.