How do I model the following using Castle ActiveRecord?
I have two classes, Customer and Task.
I would like to reuse a third class, Note, stored in a Collection in each of the Customer and Task classes.
public class Note
{
public int ID { get; set; }
public string Subject { get; set; }
public string Body { get; set; }
}
public class Customer
{
public int ID { get; set; }
public IList<Note> Notes { get; set; }
}
public class Task
{
public int ID { get; set; }
public IList<Note> Notes { get; set; }
}
I would then like to be able to pass the Notes collection to a Gridview, Listview or Repeater in the relevant ASP.Net page for the Customer or Task classes.
I think what you need is to implement a type hierarchy. You can read about it here.
We settled on the following pattern:
[ActiveRecord]
public class Note
{
[PrimaryKey]
public int ID { get; set; }
[Property]
public string Subject { get; set; }
[Property]
public string Body { get; set; }
[BelongsTo]
public Customer Customer { get; set; }
[BelongsTo]
public Customer Task{ get; set; }
}
[ActiveRecord]
public class Customer
{
[PrimaryKey]
public int ID { get; set; }
[HasMany]
public IList<Note> Notes { get; set; }
}
[ActiveRecord]
public class Task
{
[PrimaryKey]
public int ID { get; set; }
[HasMany]
public IList<Note> Notes { get; set; }
}
Related
How I can get book AsQueryable with category name in bookParams?
It can be implemented in any way as long as it returns AsQueryable to I can do pagination.
Thanks for any help.
BookService.cs
public async Task<PagedList<Book>> GetBooksAsync(BookParams bookParams)
{
var query = repository.context.Books.AsQueryable();
// query to get books with category name
return await PagedList<Book>.CreateAsync(query, bookParams.pageNumber, bookParams.pageSize);
}
Book.cs
public class Book: IEntity
{
public int Id { get; set; }
public string Title { get; set; }
public virtual ICollection<BookCategory> BookCategories { get; set; }
}
Category.cs
public class Category: IEntity
{
public int Id { get; set; }
public string Name { get; set; }
public virtual List<BookCategory> BookCategories { get; set; }
}
BookCategory.cs
public class BookCategory: IEntity
{
public int Id { get; set; }
public int BookId { get; set; }
public virtual Book Book { get; set; }
public int CategoryId { get; set; }
public virtual Category Category { get; set; }
}
Is there someone who will listen to me and help me solve my problem?
I have 3 classes (Product, Lot and Rem):
Each Product has many Lot and each Lot has many Rem.
public class Product {
public int id { get; set; }
public string name { get; set; }
}
public class Lot {
public int id { get; set; }
public decimal price { get; set; }
}
public class Rem {
public int id { get; set; }
public string note { get; set; }
}
From what you described above this is a simple way for related entities in EF.
public class Product {
public int id { get; set; }
public string name { get; set; }
public Lot LotId {get; set; }
public ICollection<Lot> Lots { get; set; }
}
public class Lot {
public int id { get; set; }
public decimal price { get; set; }
public Product ProductId {get; set; }
public Product Product {get; set; }
public Rem RemId {get; set; }
public ICollection<Rem> Rems { get; set; }
}
public class Rem {
public int id { get; set; }
public string note { get; set; }
public Lot LotId {get; set; }
public Lot Lot { get; set; }
}
And the dbcontext class
public class AppDbContext: DbContext
{
public AppDbContext(DbContextOptions<AppDbContext> options): base(options)
{
}
public DbSet<Product> Products { get; set; }
public DbSet<Lot> Lots { get; set; }
public DbSet<Rem> Rems { get; set; }
}
You can find further explanation about relationships in EF from relationships in EF
I have an model like this:
public class EquipmentEmployee
{
public int EquipmentEmployeeID { get; set; }
public int EmployeeID { get; set; }
public Employee Employee { get; set; }
public int EquipmentID { get; set; }
public Equipment Equipment { get; set; }
public int RequisitionID { get; set; }
public Requisition Requisition { get; set; }
public DateTime From { get; set; }
public DateTime To { get; set; }
public string Comment { get; set; }
}
I use Mvc scaffolding for creating my controllers, repositories and views. Int the create View I'm not able to POST since I dont have values for "to" and "RequisitionID". I have not added [Required] to them. Is this possible? To POST and have those two null?
You should declare optional fields using a nullable type
public int? RequisitionID { get; set; }
To accept the null values you can use the following solution.
public int? RequisitionID { get; set; }
I think, I've read everything about this error and I tried everything. Here are my models:
Main:
public class Trip
{
public int TripId { get; set; }
public string Name { get; set; }
public string ShortDescription { get; set; }
public string Country { get; set; }
public float BasicPrice { get; set; }
public virtual ICollection<ApartmentType> ApartmentType { get; set; }
public virtual ICollection<TransportMethod> TransportMethod { get; set; }
public virtual ICollection<FeedingType> FeedingType { get; set; }
}
ApartmentType:
public class TransportMethod
{
public int TransportMethodId { get; set; }
public int TripId { get; set; }
public string Name { get; set; }
public float Price { get; set; }
}
FeedingType:
public class FeedingType
{
public int FeedingTypeId { get; set; }
public int TripId { get; set; }
public string Description { get; set; }
public float Price { get; set; }
}
TransportType:
public class TransportMethod
{
public int TransportMethodId { get; set; }
public int TripId { get; set; }
public string Name { get; set; }
public float Price { get; set; }
}
When serializng the Trip entity I get a circular dependency error. Things i tried:
Disable lazy loading in DbContext.
Adding
json.SerializerSettings.PreserveReferencesHandling=Newtonsoft.Json.PreserveReferencesHandling.All; to GLobal.asax
Adding a decorator [IgnoreDataMember] to TripId in every child entity.
Mapping this entity to a ViewModel which doesn't contain the ICollection members. - This worked ok, but at some point I will want to get those lists to the client.
I really don't know what's going on. What am I missing? I really can't spot any circular dependency.
Have you tried adding the [JsonIgnore] attribute to the TripId to the children entities?
http://james.newtonking.com/projects/json/help/html/T_Newtonsoft_Json_JsonIgnoreAttribute.htm
or setting
json.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
I have the following model:
public class Member
{
public int Id { get; set; }
public string Username { get; set; }
public int MainEmailId { get; set; }
public virtual Email MainEmail { get; set; }
public virtual ICollection<Email> MemberEmails { get; set; }
}
public partial class Email
{
public Int32 Id { get; set; }
public String Email { get; set; }
public int MemberId { get; set; }
public virtual Member Member { get; set; }
}
As you can see I wish to create a:
one-to-one relation from the Member to MemberEmail (the main email address)
one-to-many relation from Member to MemberEmail
I know how to do this with Code First Fluent API. However I need to do it with DataAnnotations only. Is this possible?
Thanks a lot.