Complex Linq to Entities Query - linq

Question

I have done simple LINQ queries but I am stumped on the 2 I need to create now. Basically I am going to get a class ID sent in. I will post the classes the entities are based on below.
public class ScheduledClass
{
public ScheduledClass()
{
Attendees = new List<ClassAttendee>();
}
[HiddenInput(DisplayValue = false)]
public int ID { get; set; }
[HiddenInput(DisplayValue = false)]
[Required(ErrorMessage = "Please enter a topic")]
public int ClassTopicID { get; set; }
[Display(Name = "Topic")]
public virtual ClassTopic ClassTopic { get; set; }
[HiddenInput(DisplayValue = false)]
public int ClassTypeID { get; set; }
[Display(Name = "Class Type")]
public virtual ClassType ClassType { get; set; }
[Required]
[DataType(DataType.Date)]
[Display(Name = "Class Date")]
public DateTime ClassDate { get; set; }
[Display(Name = "Attendees")]
public virtual ICollection<ClassAttendee> Attendees { get; set; }
}
public ClassTopic()
{
Products = new List<ClassTopicProduct>();
}
[HiddenInput(DisplayValue = false)]
public int ID { get; set; }
[Required(ErrorMessage = "Please enter a title")]
public string Title { get; set; }
[DataType(DataType.MultilineText)]
public string Description { get; set; }
[Display(Name = "Products")]
public virtual ICollection<ClassTopicProduct> Products { get; set; }
}
public class ClassTopicProduct
{
[HiddenInput(DisplayValue = false)]
public int ID { get; set; }
[HiddenInput(DisplayValue = false)]
public int ClassTopicID { get; set; }
[ForeignKey("ClassTopicID")]
public ClassTopic ClassTopic { get; set; }
[HiddenInput(DisplayValue = false)]
public int ProductID { get; set; }
[ForeignKey("ProductID")]
public ProductType ProductType { get; set; }
}
public class CustomerEmail
{
public CustomerEmail()
{
CustomerEmailModules = new List<CustomerEmailModule>();
}
[HiddenInput(DisplayValue = false)]
public int ID { get; set; }
[HiddenInput(DisplayValue = false)]
public int CustomerID { get; set; }
public virtual Customer Customer { get; set; }
public string Name { get; set; }
public string Email { get; set; }
[DataType(DataType.PhoneNumber)]
public string PhoneNumber { get; set; }
[Display(Name = "Product Update")]
public Boolean SendProductUpdateEmail { get; set; }
[Display(Name = "Expiration ")]
public Boolean SendExpirationEmail { get; set; }
[Display(Name = "Products")]
public virtual ICollection<CustomerEmailModule> CustomerEmailModules { get; set; }
}
public class CustomerEmailModule
{
[HiddenInput(DisplayValue = false)]
public int ID { get; set; }
[HiddenInput(DisplayValue = false)]
public int CustomerEmailID { get; set; }
public CustomerEmail CustomerEmail { get; set; }
[HiddenInput(DisplayValue = false)]
public int? ProductID { get; set; }
[ForeignKey("ProductID")]
public ProductType ProductType { get; set; }
}
EDIT___________________________
public class ProductType
{
[HiddenInput(DisplayValue = false)]
public int ID { get; set; }
[Required(ErrorMessage = "Please enter a product type description")]
public string Description { get; set; }
public virtual ICollection<ProductTypeDetail> ProductDetails { get; set; }
}
EDIT_________________________________
So I am basically trying to send emails to people who might be interested in an upcoming class. Each class has a class topic. The class topic has 1 or more products associated with them. When I get the Class ID I need to go get all of the products associated with the class topic for the class. Once I have that I need to go look at CustomerEmails. Each CustomerEmail has any number of products that they are interested in associated with them. I need to find any CustomerEmail that has CustomerEmailModules where the PRoductID = Any of the product IDs in the Class Topic Products results. Here is what I tried to do below that is not working.
public JsonResult GetEmailClassInterest(int id)
{
var classprods = UoW.ScheduledClasses
.Where(o => o.ID == id)
.Select(p => new
{
p.ClassTopic.Products
});
var customeremails = from p in UoW.CustomerEmails where classprods.Any(z => z.Products.Any(x => x.ID == p.ID)) select p.Email;
return Json(customeremails, JsonRequestBehavior.AllowGet);
}
The query seems to run through ok but I get no results and there shoudl be base don the data I have. If anyone can tell me what I am doing wrong I would appreciate it.
Thanks

Answer 1

Try doing this:
var classprods = UoW.ScheduledClasses
.Where(o => o.ID == id)
.SelectMany(sched => sched.ClassTopic.Products.Select(prod => prod.ProductID));
var customerEmails = UoW.CustomerEmailModules.Include("CustomerEmails")
.Where(mod => mod.ProductID != null && classprods.Contains(mod.ProductID)
.Select(mod => mod.CustomerEmail.Email);