问题描述
* 更新: 能够follow this tutorial,现在我得到的错误是状态:
"message": "No HTTP resource was found that matches the request URI 'http://localhost:0000/api/v1/Pets('dog')/Color'."
"message": "No routing convention was found to select an action for the OData path with template '~/entityset/key/unresolved'."
有什么想法吗?*
尝试使用OData V4在我的Pet查询中检索颜色时出现错误。 我遇到了很多麻烦,理想情况下,我会在颜色上使用扩展功能(例如localhost:0000 / api / v1 / Pets('dog')?$ expand = Colors)
我需要返回的JSON类似于:
[
{
"_Key": "1","animalname": "dog","furcolorname": "black,white","color": {
"_Key": "1","colorname": "black"
},{
"_Key": "2","colorname": "white"
}
}
]
也许我走在完全错误的道路上,无论哪种方式都值得赞赏!
如果我查询localhost:0000 / api / v1 / Pets('dog'):
…
"Message\": \"Invalid column name 'Pet__Key'.\"
…
如果我查询localhost:0000 / api / v1 / Pets('dog')?$ exand = Colors:
…
"The query specified in the URI is not valid. Could not find a property named 'Colors' on type 'PetShop.Odata.Models.Pet'."
…
Pet.cs模型:
namespace PetShop.Odata.Models
{
[Table("pet")]
public class Pet
{
[Key]
public string _Key { get; set; }
public string AnimalName { get; set; }
[ForeignKey("Color")]
public string FurColorName { get; set; }
public virtual Color Color { get; set; }
public virtual ICollection<Color> Colors { get; set; }
}
}
Color.cs模型:
namespace PetShop.Odata.Models
{
[Table("color")]
public class Color
{
public Color()
{
new HashSet<Pet>();
}
[Key]
public string _Key { get; set; }
public string ColorName { get; set; }
}
}
PetsController.cs:
namespace PetShop.Odata.Controllers
{
[ApiVersion("1.0")]
[ODaTaroutePrefix("Pets")]
[ApiControllerMetricReport]
public class PetsController : ODataController
{
private readonly MyContext context = new MyContext ();
[HttpGet]
[ODaTaroute]
[EnableQuery]
[ResponseType(typeof(List<Pet>))]
public IHttpActionResult Get()
{
return Ok(context.Pets.AsQueryable());
}
[EnableQuery]
public IQueryable<Color> Get ([FromODataUri] string key)
{
return context.Pets.Where(m => m._Key == key).SelectMany(a => a.Colors);
}
protected override void dispose(bool disposing)
{
context.dispose();
base.dispose(disposing);
}
}
}
ColorsController.cs:
namespace PetShop.Odata.Controllers
{
[ApiVersion("1.0")]
[ODaTaroutePrefix("Colors")]
[ApiControllerMetricReport]
public class ColorsController : ODataController
{
private readonly MyContext context = new MyContext ();
[HttpGet]
[ODaTaroute]
[EnableQuery]
[ResponseType(typeof(List<Color>))]
public IHttpActionResult Get()
{
return Ok(context.Colors.AsQueryable());
}
protected override void dispose(bool disposing)
{
context.dispose();
base.dispose(disposing);
}
}
}
PetConfig.cs:
namespace PetShop.Odata.Configuration
{ public class PetModelConfiguration : IModelConfiguration
{
public void Apply(ODataModelBuilder builder,ApiVersion apiVersion)
{
builder.EntitySet<Pet>("Pets");
}
}
}
ColorConfig.cs:
namespace PetShop.Odata.Configuration
{ public class ColorModelConfiguration : IModelConfiguration
{
public void Apply(ODataModelBuilder builder,ApiVersion apiVersion)
{
builder.EntitySet<Color>("Colors");
}
}
}
MyContext.cs:
…
public DbSet<Pet> Pets { get; set; }
public DbSet<Color> Colors { get; set; }
…
Setup.cs:
…
public static HttpServer CreateHttpServer()
{
var httpConfig = new HttpConfiguration();
var webApiServer = new HttpServer(httpConfig);
httpConfig.AddApiVersioning(options => options.ReportApiVersions = true);
httpConfig.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
var modelBuilder = new VersionedODataModelBuilder(httpConfig)
{
ModelBuilderFactory = () => new ODataConventionModelBuilder().EnableLowerCamelCase(),ModelConfigurations =
{
new PetConfig(),new ColorConfig()
},};
var models = modelBuilder.GetEdmModels();
httpConfig.Count().Filter().OrderBy().Expand().Select().MaxTop(null);
…
解决方法
假设您使用的是默认路由约定,则PetsController.cs中的“获取颜色”方法与预期的OData路由格式不匹配。
代替以下内容:
[EnableQuery]
public IQueryable<Color> Get ([FromODataUri] string key)
{
return context.Pets.Where(m => m._Key == key).SelectMany(a => a.Colors);
}
您应该尝试:
[EnableQuery]
public IQueryable<Color> GetColors ([FromODataUri] string key)
{
return context.Pets.Where(m => m._Key == key).SelectMany(a => a.Colors);
}
此定义将使OData路由:http://localhost:0000/api/v1/Pets('dog')/Colors
有关路由约定的更多信息,请参见https://docs.microsoft.com/en-us/odata/webapi/built-in-routing-conventions。
也存在几种替代方法: