64 lines
2.9 KiB
C#
64 lines
2.9 KiB
C#
using DataLayer.Configurations;
|
|
using Microsoft.EntityFrameworkCore;
|
|
|
|
namespace DataLayer
|
|
{
|
|
public class LibationContext : DbContext
|
|
{
|
|
// IMPORTANT: USING DbSet<>
|
|
// ========================
|
|
// these run against the db. linq queries against these MUST be translatable to sql. primatives only. no POCOs or this error occurs:
|
|
// Unable to create a constant value of type 'DataLayer.Contributor'. Only primitive types or enumeration types are supported in this context.
|
|
// to use full object-linq, load and use Local. HOWEVER, Local is only hashed/indexed on PK. All other searches are very slow
|
|
// load full table:
|
|
// List<Contributor> contributors = ...;
|
|
// Contributors.Load();
|
|
// Contributors.Local.Where(a => contributors.Contains(a));
|
|
// load only those in object:
|
|
// // overwrite collection
|
|
// Entry(product).Collection(x => x.Narrators).Load();
|
|
// product.Narrators = narrators;
|
|
public DbSet<LibraryBook> LibraryBooks { get; private set; }
|
|
public DbSet<Book> Books { get; private set; }
|
|
public DbSet<Contributor> Contributors { get; private set; }
|
|
public DbSet<Series> Series { get; private set; }
|
|
public DbSet<Category> Categories { get; private set; }
|
|
|
|
public static LibationContext Create(string connectionString)
|
|
{
|
|
var factory = new LibationContextFactory();
|
|
var context = factory.Create(connectionString);
|
|
return context;
|
|
}
|
|
|
|
// see DesignTimeDbContextFactoryBase for info about ctors and connection strings/OnConfiguring()
|
|
internal LibationContext(DbContextOptions options) : base(options) { }
|
|
|
|
// typically only called once per execution; NOT once per instantiation
|
|
protected override void OnModelCreating(ModelBuilder modelBuilder)
|
|
{
|
|
base.OnModelCreating(modelBuilder);
|
|
|
|
modelBuilder.ApplyConfiguration(new BookConfig());
|
|
modelBuilder.ApplyConfiguration(new ContributorConfig());
|
|
modelBuilder.ApplyConfiguration(new BookContributorConfig());
|
|
modelBuilder.ApplyConfiguration(new LibraryBookConfig());
|
|
modelBuilder.ApplyConfiguration(new SeriesConfig());
|
|
modelBuilder.ApplyConfiguration(new SeriesBookConfig());
|
|
modelBuilder.ApplyConfiguration(new CategoryConfig());
|
|
|
|
// seeds go here. examples in Dinah.EntityFrameworkCore.Tests\DbContextFactoryExample.cs
|
|
|
|
modelBuilder
|
|
.Entity<Category>()
|
|
.HasData(Category.GetEmpty());
|
|
modelBuilder
|
|
.Entity<Contributor>()
|
|
.HasData(Contributor.GetEmpty());
|
|
|
|
// views are now supported via "keyless entity types" (instead of "entity types" or the prev "query types"):
|
|
// https://docs.microsoft.com/en-us/ef/core/modeling/keyless-entity-types
|
|
}
|
|
}
|
|
}
|