Hello, My question is related with the model. When i was using ef 6 i was using Microsoft.Linq.Translations package to filter and create calculated properties inside the model. With the help of this library i could create where queries to filter. As an example.
I have Associate, Company and Person model.
Person has FirstName and LastName
Company has only the Name Property and
Associate has Type property which holds the information if it is a person or company
sth like this.
Associate
public class Associate : FullAuditedEntity, IMayHaveTenant
{
public int? TenantId { get; set; }
public AssociateType Type { get; set; }
private static readonly CompiledExpression<Associate, string> NameExpression
= DefaultTranslationOf<Associate>.Property(a => a.Name).Is(a => a.Type == AssociateType.Person ? a.Person.FirstName + " "+ a.Person.LastName : a.Company.Name);
private static readonly CompiledExpression<Associate, string> EmailExpression
= DefaultTranslationOf<Associate>.Property(a => a.Email).Is(a => a.Type == AssociateType.Person ? a.Person.Email : a.Company.Email);
public string Name
{
get
{
return NameExpression.Evaluate(this);
}
}
public string Email
{
get
{
return EmailExpression.Evaluate(this);
}
}
public virtual Person Person { get; set; }
public virtual Company Company { get; set; }
}
As you can see readonly properties are not created in db but i can do the filtering and sorting through iqueryable. I was achieving this with the help of the library but now with the update ef core doesn't support it. Do you have any idea how can i achieve the same behavior with ef core. Thanks in advance.
3 Answer(s)
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0
Also i want to ask sth else related. when i try to get the entity with an id for the associate, it does not get the model person or company which is lazy loaded normally in ef6. Now when i call getasync method i can not load the other models in an easy way so instead in my app service i coded like this.
public async Task<GetAssociateForEditOutput> GetAssociateForEdit(NullableIdDto input) { Associate associate = null; if (input.Id.HasValue) { associate = await _associateRepository.GetAll().Include(a => a.Person).Include(a => a.Company).Where(a => a.Id == input.Id.Value).FirstOrDefaultAsync(); } var output = new GetAssociateForEditOutput(); //Associate output.Associate = associate != null ? associate.MapTo<AssociateEditDto>() : new AssociateEditDto() { Person = new AssociateEditPerson(), Company = new AssociateEditCompany() }; return output; }is there an easy extension to load this child models with getasync ?this was my previous code.
public async Task<GetAssociateForEditOutput> GetAssociateForEdit(NullableIdDto input) { Associate associate = null; if (input.Id.HasValue) { associate = await _associateRepository.GetAsync(input.Id.Value); } var output = new GetAssociateForEditOutput(); //Associate output.Associate = associate != null ? associate.MapTo<AssociateEditDto>() : new AssociateEditDto() { Person = new AssociateEditPerson(), Company = new AssociateEditCompany() }; return output; } -
0
Hi,
For your first question, have you tried ignoring that field in your DbContext's onModelCreating ?
modelBuilder.Entity<MyEntity>().Ignore(e => e.NotMappedProperty);For your second question, EF Core does not support lazy loading at the moment. Instead, you can use EnsureLoadedAsync of generic repositories like this:
await _personRepository.EnsureLoadedAsync(person, p => p.Phones);Thanks.
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0
Hello @ismcagdas For the first answer. Yes i have tried it but you can only select it. You can not do filtering and sorting. My quick fix for that is i am relating the properties to db and everytime i create or update i am also rewriting the values to the parent associate table.
For the second answer. EnsureLoadedAsync doesn't support only one entity it expects icollection or ienumerable i guess. for my example i can not use it.
