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POASP.NET MVC 3, Entity Framework 4. Update entity with relation to many
 

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    <p>I want to update a "Post" and change relationships with "Categories" that already created before. Post entity has ICollection of Categories. But categories are not changed. It seems, that EF does not track entity relations. By the way I have no problem with creating of new Posts with assigning of Categories.</p> <p>There are two models:</p> <pre><code>public class Post { public virtual int PostId { get; set; } ... public virtual ICollection&lt;Category&gt; Categories { get; set; } } public class Category { public virtual int CategoryId { get; set; } ... public virtual ICollection&lt;Post&gt; Posts { get; set; } } </code></pre> <p>The Add controller, that works as expected:</p> <pre><code>public ActionResult Create(Post model) { var c = Request.Form["CategoryID"].Split(','); model.Categories = c.Select ... .ToList(); //here I assign relationships with attached objects _repository.Add(model); _repository.SaveChanges(); ... } </code></pre> <p>Repository Add method:</p> <pre><code>T IRepository.Add&lt;T&gt;(T entity) { return Set&lt;T&gt;().Add(entity); } </code></pre> <p>The Edit controller does not save changed categories, only post props.</p> <pre><code>public ActionResult Edit(Post model) { var c = Request.Form["CategoryID"].Split(','); model.Categories = c.Select ... .ToList(); //here I update relationships with attached objects _repository.Attach(model); _repository.SaveChanges(); ... } </code></pre> <p>Repository Edit method:</p> <pre><code>T IRepository.Attach&lt;T&gt;(T entity) { var entry = Entry(entity); entry.State = System.Data.EntityState.Modified; return entity; } </code></pre> <p>Am I doing something wrong?</p> <p>Thanks in advance</p>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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