英孚核心。 从多对多关系中获取数据

Question

I'm new to EF Core. I have many-many relationship between 2 tables. In total, I have these 3 tables:

1. Tenant.
2. UserTenant.
3. User.

User has property "email". I want to get all tenants that are related to user by given user email. How to do that? I would do something like this but I think is bad approach.

var user = await dbContext.Users.FirstAsync(u => u.Email == userEmail);
var userTenants = dbContext.UserTenants.Where(u => u.UserId == user.Id);
etc...

Answer 1

What you could do is to create a Class ex:

   public class UserEmailViewModel
{
    public int Id { get; set; }
    public string Email{ get; set; }

}

and Then

var userEmail = await dbContext.SqlQuery<UserEmailViewModel>("select Id, Email from User U , Tenant T , UserTenant UT where u.id=ut.Userid and t.Id=UT.TenantId ")

Note That you should add Properties to UserEmailViewModel if you want to add column to the query