2017-10-18 197 views
0

在下面的代碼,你會看到在ProducesResponseType一件T型(通用),但我不能讓它工作,因爲它不是一個特定類型:如何在ProducesResponseType Swagger上返回泛型?

public class ApiController<T> : ApiBaseController where T : class, IDocument 
    {  
    protected IDataService<T> data = null; 

    [HttpGet("{id}")] 
    **[ProducesResponseType(typeof(T), 201)]** 
    [ProducesResponseType(typeof(void), 500)]   
    public async Task<IActionResult> Get(string id) 
    { 
     var result = await data.Get(id); 

     return Ok(result); 
    } 
} 

有什麼建議?

+0

您無法通過屬性。但是你可以編寫你自己的'ISchemaFilter'或者'IDocumentFilter'來修改打開的api文件,在它被序列化爲json之前 – Tseng

+0

@Tseng你有沒有這方面的示例? – Jude

回答

1

經過仔細觀察,似乎可以(並且更容易)使用操作過濾器。

沿着這個線應該工作(未經測試,只是確保它沒有編譯錯誤)。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Reflection; 
using System.Text; 
using System.Threading.Tasks; 
using Microsoft.AspNetCore.Mvc.Controllers; 
using Swashbuckle.AspNetCore.Swagger; 
using Swashbuckle.AspNetCore.SwaggerGen; 

namespace MyCompany.Common.Web.Swagger.OperationFilters 
{ 
    public class GenericOperationFilter : IOperationFilter 
    { 
     public void Apply(Operation operation, OperationFilterContext context) 
     { 
      if (context.ApiDescription.ActionDescriptor is ControllerActionDescriptor controllerDescriptor) 
      { 
       var baseType = controllerDescriptor.ControllerTypeInfo.BaseType?.GetTypeInfo(); 
       // Get type and see if its a generic controller with a single type parameter 
       if (baseType == null || (!baseType.IsGenericType && baseType.GenericTypeParameters.Length == 1)) 
        return; 

       if (context.ApiDescription.HttpMethod == "GET" && !operation.Responses.ContainsKey("200")) 
       { 
        var typeParam = baseType.GenericTypeParameters[0]; 

        // Get the schema of the generic type. In case it's not there, you will have to create a schema for that model 
        // yourself, because Swagger may not have added it, because the type was not declared on any of the models 
        string typeParamFriendlyId = typeParam.FriendlyId(); 

        if (!context.SchemaRegistry.Definitions.TryGetValue(typeParamFriendlyId, out Schema typeParamSchema)) 
        { 
         // Schema doesn't exist, you need to create it yourself, i.e. add properties for each property of your model. 
         // See OpenAPI/Swagger Specifications 
         typeParamSchema = context.SchemaRegistry.GetOrRegister(typeParam); 

         // add properties here, without it you won't have a model description for this type 
        } 

        // for any get operation for which no 200 response exist yet in the document 
        operation.Responses.Add("200", new Response 
        { 
         Description = "Success", 
         Schema = new Schema { Ref = typeParamFriendlyId } 
        }); 
       } 
      } 
     } 
    } 
} 

它能做什麼?每個操作(Get,Post,Put等)都會調用IOperationFilter。在它裏面,你檢查它是否是ControllerActionDescriptor,如果是,請檢查控制器類型。

如果您願意,您可以縮小爲一種特定類型。我剛剛採取了從另一個類繼承的每個控制器,它的基類型與通用參數通用。然後檢查它是否爲「Get」操作(post,put,delete通常不返回模型,只是狀態碼/錯誤響應),然後檢查該類型是否已經在Swagger/OpenAPI中模式定義。如果模型在那裏,請閱讀它的模式並在響應中引用它。

如果模型未在模式註冊表中註冊,則會變得更加複雜。您需要使用反射並構建模式文件,將其添加到存儲庫(在調用context.SchemaRegistry.GetOrRegister(typeParam)期間已發生),然後按照上面的方法引用它。

當模型沒有用作任何其他控制器中的響應或動作參數時,會發生這種情況。

您可以獲得關於OpenAPI 2.0規範的更多信息。