EntitySetController多个导航属性

时间：2014-01-20 20:11:48

标签： c# asp.net-web-api odata

我有一个具有多个导航属性的类的控制器：

public partial class Fixture
{
    public int FixtureId { get; set; }

    //foreign key
    public int StageId { get; set; }
    //navigation properties
    public virtual Stage Stage { get; set; }

    //foreign key
    public int CityId { get; set; }
    //navigation properties
    public virtual City City { get; set; }

    public DateTime FixtureDate { get; set; }

    //foreign key
    public int AwayTeamId { get; set; }
    //navigation properties
    public virtual Team AwayTeam { get; set; }

    //foreign key
    public int HomeTeamId { get; set; }
    //navigation properties
    public virtual Team HomeTeam { get; set; }

    public byte? AwayTeamScore { get; set; }
    public byte? HomeTeamScore { get; set; }
}

我现在正在编写我的第一个EntitySetController，我希望包含3个导航属性。我知道如何包括这样的：

public IQueryable<Fixture> GetFixtures()
{
    return db.Fixtures.Include("Stage");
}

是否可以包含多个导航属性？

另外，在我的帖子中如何使用这些来获取相关对象？在以前的版本ApiController中，我编写了存储库方法来获取它们（见下文）。什么是EntitySetController等价物？

public override HttpResponseMessage Post(Fixture fixture)
{
    try
    {
        if (ModelState.IsValid)
        {
            Stage stage = _repository.GetStageByStageId(fixture.StageId);
            City city = _repository.GetCityByCityId(fixture.CityId);
            Team awayTeam = _repository.GetTeamByTeamName(fixture.AwayTeamName);
            Team homeTeam = _repository.GetTeamByTeamName(fixture.HomeTeamName);

            Fixture entity = new Fixture();
            entity.StageId = stage.StageId;
            entity.CityId = city.CityId;
            entity.FixtureDate = fixture.FixtureDate;
            entity.AwayTeamId = awayTeam.TeamId;
            entity.HomeTeamId = homeTeam.TeamId;
            entity.AwayTeamScore = fixture.AwayTeamScore;
            entity.HomeTeamScore = fixture.HomeTeamScore;

            db.Fixtures.Add(fixture);
            db.SaveChanges();
            var response = Request.CreateResponse(HttpStatusCode.Created, fixture);
            //response.Headers.Location = new Uri(Url.Link("DefaultApi", 
            //                                new { id = fixture.FixtureId }));

            return response;
        }
        else
        {
            return Request.CreateResponse(HttpStatusCode.BadRequest);
        }
    }
    catch
    {
        return Request.CreateResponse(HttpStatusCode.BadRequest);
    }
}

编辑：我使用了多个包含并引用了Post方法中的导航属性：

public override HttpResponseMessage Post(Fixture fixture)
{
    try
    {
        if (ModelState.IsValid)
        {
            Fixture entity = new Fixture();
            entity.StageId = fixture.Stage.StageId;
            entity.CityId = fixture.City.CityId;
            entity.FixtureDate = fixture.FixtureDate;
            entity.AwayTeamId = fixture.AwayTeam.TeamId;
            entity.HomeTeamId = fixture.HomeTeam.TeamId;
            entity.AwayTeamScore = fixture.AwayTeamScore;
            entity.HomeTeamScore = fixture.HomeTeamScore;

            db.Fixtures.Add(entity);
            db.SaveChanges();
            var response = Request.CreateResponse(HttpStatusCode.Created, fixture);

            return response;
        }
        else
        {
            return Request.CreateResponse(HttpStatusCode.BadRequest);
        }
    }
    catch
    {
        return Request.CreateResponse(HttpStatusCode.BadRequest);
    }
}

但是我收到400 Bad Request错误，当我查看传递的对象时，它看起来像这样

request: Object
body: "{"FixtureId":0,"StageId":0,"CityId":0,"FixtureDate":"2014-09-08T21:00:00.000","AwayTeamId":0,"HomeTeamId":0}"
callbackParameterName: "$callback"
data: Object
AwayTeam: undefined
AwayTeamId: 0
AwayTeamScore: undefined
City: undefined
CityId: 0
FixtureDate: "2014-09-08T21:00:00.000"
FixtureId: 0
HomeTeam: undefined
HomeTeamId: 0
HomeTeamScore: undefined
Stage: undefined
StageId: 0

UI看起来像这样，并且所有下拉列表都已成功填充：

    <div data-ng-app="app" ng-controller="FixtureAddController">
    <form name="form" class="col-xs-2" id="form" class="form-horizontal">
        <div class="control-group" ng-class="{error: form.StageName.$invalid}">
            <label class="control-label" for="StageName">Stage Team</label>
            <div class="controls">
                <select class="form-control" ng-model="fixture.StageName" ng-options="stage.StageName as stage.StageName for stage in stages" required>
                    <option style="display:none" value="">Select</option>
                </select>
                <span ng-show="form.StageName.$dirty && form.StageName.$error.required">Stage required</span>
            </div>
        </div>
        <div class="control-group" ng-class="{error: form.CityName.$invalid}">
            <label class="control-label" for="CityName">City</label>
            <div class="controls">
                <select class="form-control" ng-model="fixture.CityName" ng-options="city.CityName as city.CityName for city in cities" required>
                    <option style="display:none" value="">Select</option>
                </select>
                <span ng-show="form.CityName.$dirty && form.CityName.$error.required">City required</span>
            </div>
        </div>
        <div class="control-group" ng-class="{error: form.FixtureDate.$invalid}">
            <label class="control-label" for="BirthDate">Fixture Date</label>
            <div class="controls">
                <input type='text' class="form-control" ng-model='fixture.FixtureDate' name='FixtureDate' title="FixtureDate" ng-pattern='/^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$/' required />
                <span ng-show='form.FixtureDate.$dirty && form.FixtureDate.$error.required'>Fixture Date required</span>
                <span ng-show='form.FixtureDate.$dirty && form.FixtureDate.$error.pattern'>Fixture Date invalid</span>
            </div>
        </div>
        <div class="control-group" ng-class="{error: form.HomeTeamName.$invalid}">
            <label class="control-label" for="HomeTeamName">Home Team</label>
            <div class="controls">
                <select class="form-control" ng-model="fixture.HomeTeamName" ng-options="team.TeamName as team.TeamName for team in teams" required>
                    <option style="display:none" value="">Select</option>
                </select>
                <span ng-show="form.HomeTeamName.$dirty && form.HomeTeamName.$error.required">Home Team required</span>
            </div>
        </div>
        <div class="control-group" ng-class="{error: form.AwayTeamName.$invalid}">
            <label class="control-label" for="AwayTeamName">Away Team</label>
            <div class="controls">
                <select class="form-control" ng-model="fixture.AwayTeamName" ng-options="team.TeamName as team.TeamName for team in teams" required>
                    <option style="display:none" value="">Select</option>
                </select>
                <span ng-show="form.AwayTeamName.$dirty && form.AwayTeamName.$error.required">Away Team required</span>
            </div>
        </div>
        <br />
        <div class="form-actions">
            <button ng-show="form.$valid" ng-click="save()" class="btn btn-primary">{{action}}</button>
            <a href="/Admin/Fixtures/List" class="btn btn-danger">Cancel</a>
        </div>
    </form>
</div>

我如何成功完成帖子？

编辑2：例如，当我将UI fixture.CityId更改为fixture.City.CityName以将下拉列表中的值绑定到fixture对象时，当我发布时，我收到以下错误：

Exception {name: "HTTP request failed", message: "{"$id":"1","Message":"No HTTP resource was found t…http://lovelyjubbly.cloudapp.net/odata/$batch'."}", data: Object, stack: (...), _getStackTrace: function…}
data: Object
message: "HTTP request failed"
request: Object
body: "
↵--batch_c20a-c604-4067
↵Content-Type: multipart/mixed; boundary=changeset_3cce-3259-213d
↵
↵--changeset_3cce-3259-213d
↵Content-Type: application/http
↵Content-Transfer-Encoding: binary
↵
↵POST Cities HTTP/1.1
↵Content-Id: 1
↵MaxDataServiceVersion: 3.0
↵DataServiceVersion: 3.0
↵Accept: application/atomsvc+xml;q=0.8, application/json;odata=verbose;q=0.5, */*;q=0.1
↵Content-Type: application/json;odata=verbose
↵
↵{"CityId":0,"CityName":"Brasilia"}
↵--changeset_3cce-3259-213d
↵Content-Type: application/http
↵Content-Transfer-Encoding: binary
↵
↵POST Fixtures HTTP/1.1
↵Content-Id: 2
↵MaxDataServiceVersion: 3.0
↵DataServiceVersion: 3.0
↵Accept: application/atomsvc+xml;q=0.8, application/json;odata=verbose;q=0.5, */*;q=0.1
↵Content-Type: application/json;odata=verbose
↵
↵{"FixtureId":0,"StageId":0,"CityId":0,"FixtureDate":"2012-11-10T22:00:00.000","AwayTeamId":0,"HomeTeamId":0,"City":{"__metadata":{"uri":"$1"}}}
↵--changeset_3cce-3259-213d--
↵
↵--batch_c20a-c604-4067--
↵"
callbackParameterName: "$callback"
data: Object
__batchRequests: Array[1]
0: Object
__changeRequests: Array[2]
0: Object
body: "{"CityId":0,"CityName":"Brasilia"}"
data: Object
headers: Object
method: "POST"
requestUri: "Cities"
__proto__: Object
1: Object
body: "{"FixtureId":0,"StageId":0,"CityId":0,"FixtureDate":"2012-11-10T22:00:00.000","AwayTeamId":0,"HomeTeamId":0,"City":{"__metadata":{"uri":"$1"}}}"
data: Object
headers: Object
method: "POST"
requestUri: "Fixtures"
__proto__: Object
length: 2

1 个答案:

答案 0 :(得分：0)

对于您的第一个问题 - 是的，您可以包含多个导航属性。

return db.Fixtures
    .Include("Stage")
    .Include("FixtureDate")
    .Include("AwayTeam");

等

EDIT 至于你的第二个问题 - 如果你已经将Fixtures类定义为具有这些导航属性，并且来自db的加载会带回包含所有相关“包含”的完整图形，那么该模型应该仍然完好无损。控制器＆gt;视图＆gt;控制器流程。 这意味着您应该只能访问Fixture.AwayTeam.Name之类的数据（或AwayTeam的任何属性）。

您还可以将完整模型/图表的更改提交给EntityFramework，但是如果使用这样的断开连接的图形，您将需要有一个策略如何为图形的每个部分正确设置EntityState，否则您可能会遇到错误做的事情如下： - 提交使用现有AwayTeam的新Fixture（EF将尝试创建新的AwayTeam，而不是将现有的AwayTeam链接到新的Fixture） - 提交编辑过的Fixture和编辑过的AwayTeam

编辑2 对不起，刚刚意识到我带来了EF，你的问题不是EF。忽略EF细节！

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