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