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POBreeze Expand not working on WebAPI with EF
 

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  1. POBreeze Expand not working on WebAPI with EF
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    <p>I have published a WebAPI service which returns a list of items. I am implementing Breeze and have managed to get it basically working with filtering/sorting. However, the Expand is not working.</p> <p><a href="http://www.ftter.com/desktopmodules/framework/api/dare/dares?%24expand=ToUser" rel="nofollow">http://www.ftter.com/desktopmodules/framework/api/dare/dares?$expand=ToUser</a></p> <p>You can see the ToUserId ForeignKey in the response above, but the ToUser properties are NULL (the user definitely exists)</p> <p>You can see the ToUser EF navigation property in the metadata.</p> <p>When I use <strong>.Include</strong> on the server side I can populate it with EF, but I don't want to do this.</p> <p>I checked the Breeze Tutorial 2 here on Expand: <a href="http://learn.breezejs.com/" rel="nofollow">http://learn.breezejs.com/</a> Here is it without expand: <a href="http://learn.breezejs.com/api/northwind/Products" rel="nofollow">http://learn.breezejs.com/api/northwind/Products</a></p> <p>and here it is with Expand (And you can see the additional Category info): <a href="http://learn.breezejs.com/api/northwind/Products?%24expand=Category" rel="nofollow">http://learn.breezejs.com/api/northwind/Products?$expand=Category</a></p> <p>This is what I am trying to do but mine does not fill it...</p> <p><strong>UPDATE:</strong> I downloaded the <a href="http://www.breezejs.com/documentation/download" rel="nofollow">Breeze 1.3.6 Samples</a> and loaded the DocCode solution in VS2011. I ran it and saw that the client-side expand works; e.g. <code>http://localhost:47595/breeze/Northwind/Orders?$top=1</code> (no expand) <code>http://localhost:47595/breeze/Northwind/Orders?$top=1&amp;$expand=Customer</code> (expands customer correctly).</p> <p>I checked the WebAPI controller code and it looks the same, except they use EF Code First instead of Model First. The Foreign key is decorated with a property:</p> <p><strong>Breeze Sample that Works</strong></p> <pre><code>[ForeignKey("CustomerID")] [InverseProperty("Orders")] public Customer Customer {get; set;} </code></pre> <p>It just doesn't make sense... it is something to do with my WebAPI controller or EntityFramework relationship...</p> <p><strong>UPDATE 2</strong> I downloaded the most basic ToDo Knockout Breeze sample and added this line to the ToDoItem class: <code>public User ToUser { get; set; }</code> I am then able to Expand the WebAPI call <code>with http://localhost:63030/breeze/todos/Todos?$expand=ToUser</code></p> <p>So I have come to the conclusion that it is something to do with the fact that I am using EntityFramework DB First and not Code First. It definitely does seem possible to do in the current version of the WebAPI with Breeze and EF.</p> <p><strong>UPDATE 3</strong> I have narrowed it down to my database, EF Database First and Code First differences, but still not identified the issue. I have changed from a Model to a Code First approach with the exact same result (ie. no expand).</p> <p>For example: if you look at this Expand on the Breeze site that works, <a href="http://learn.breezejs.com/api/northwind/Products?%24expand=Category" rel="nofollow">http://learn.breezejs.com/api/northwind/Products?%24expand=Category</a>, try change the last param to an invalid field and it throws an error, e.g. : <a href="http://learn.breezejs.com/api/northwind/Products?%24expand=Category1" rel="nofollow">http://learn.breezejs.com/api/northwind/Products?%24expand=Category1</a></p> <p>However, in my code, it always ignores this param and returns ALL the records, and never throws an exception if the Expand param is incorrect: <a href="http://www.ftter.com/desktopmodules/framework/api/dare/dares?%24expand=To4657657User" rel="nofollow">http://www.ftter.com/desktopmodules/framework/api/dare/dares?$expand=To4657657User</a></p> <p>Hence I am stumped.. I have no idea why this is not working.</p> <p><strong>My Code</strong></p> <pre><code> [HttpGet] [Queryable(AllowedQueryOptions = AllowedQueryOptions.All)] public HttpResponseMessage Dares() { var response = Request.CreateResponse(HttpStatusCode.OK, (IQueryable&lt;Dare&gt;)contextProvider.Context.Dares); return ControllerUtilities.GetResponseWithCorsHeader(response); } </code></pre> <p>and here is the generated class from my EF model (using Database First)</p> <pre><code>public partial class Dare { public int DareId { get; set; } public int ToUserId { get; set; } public virtual User ToUser { get; set; } } </code></pre>
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