System.Collections.Generic.IEnumerable<MyBlogSite.Models.BlogPost>' does not contain a definition for 'Categories' - asp.net-mvc-4

Question

Here is my BlogPost Model class:
public class BlogPost
{
public int Id { get; set; }
public string Title { get; set; }
[AllowHtml]
public string ShortDescription { get; set; }
[AllowHtml]
public string PostBody { get; set; }
public string Meta { get; set; }
public string UrlSlug { get; set; }
public DateTime PostedOn { get; set; }
public DateTime? Modified { get; set; }
public virtual ICollection<BlogPostCategory> Categories { get; set; }
public virtual ICollection<BlogPostTag> Tags { get; set; }
}
Here is my BlogPostCategory Model class:
public class BlogPostCategory
{
public int Id { get; set; }
public string Name { get; set; }
public string UrlSlug { get; set; }
public string Description { get; set; }
// Decared virtual because the data must be returned from another table.
public virtual ICollection<BlogPost> BlogPosts { get; set; }
}
Each class belongs to a separate Controller/View.
Finally, here is the top port of the Index View for Blog:
#model IEnumerable<MyBlogSite.Models.BlogPost>
#{
ViewBag.Title = "Index";
}
#Html.RenderPartial("~/Views/Category/_Categories.cshtml", Model.Categories );
<p>
#Html.ActionLink("New Blog Post", "Create")
</p>
<table>
<tr>
<th>
#Html.DisplayNameFor(model => model.Title)
</th>
....
In the View where Model.Categories is being passed in is where I am getting the exception from the title of this post. It seems to me that I have defined Categories within the BlogPost Model. What am I doing wrong?

Answer 1

The Model on your Razor page is an IEnumerable<MyBlogSite.Models.BlogPost>. It seems you're trying to display the information about each of the items in your collection. If so, then you can loop through them or create a display/editor template and use #Html.DisplayFor(x => x) or #Html.EditorFor(x => x), respectively.
#foreach(var post in Model) {
<p>Do stuff here with the local "post" variable.</p>
}
Here's a link to Scott Gu's blog talking about the #model directive in Razor views.