Entity-Framework-DBZ/EntityFrameworkCore.Data/DeadBallZoneLeagueDbContext.cs

using Microsoft.EntityFrameworkCore;

using EntityFrameworkCore.Domain;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using System.Reflection;
using Microsoft.EntityFrameworkCore.Design;

namespace EntityFrameworkCore.Data;

public class DeadBallZoneLeagueDbContext : DbContext
{
  public DeadBallZoneLeagueDbContext(DbContextOptions<DeadBallZoneLeagueDbContext> options) : base(options)
  {
    // This constuctor allows it to accept the options set from other instances, such as in the API project.
  }

  public DbSet<Team> Teams { get; set; }
  public DbSet<Coach> Coaches { get; set; }
  public DbSet<League> Leagues { get; set; }
  public DbSet<Match> Matches { get; set; }
  public DbSet<TeamsAndLeaguesView> TeamsAndLeaguesView { get; set; }

  protected override void OnModelCreating(ModelBuilder modelBuilder)
  {
    // modelBuilder.ApplyConfiguration(new TeamConfiguration());
    // modelBuilder.ApplyConfiguration(new LeagueConfiguration());

    // This line can be used, then individual configurations do not need to be loaded.
    modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());

    // This database object does not have a Primary Key, so we state that here, otherwise an exception is thrown.
    modelBuilder.Entity<TeamsAndLeaguesView>().HasNoKey().ToView("vw_TeamsAndLeagues");

    // This is for user-defined functions.
    modelBuilder.HasDbFunction(
      typeof(DeadBallZoneLeagueDbContext)
      .GetMethod(
        nameof(GetEarliestTeamMatch),
        new[] {typeof(int)}
      ))
      .HasName("GetEarliestMatch");
  }

  protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder)
  {
    // These apply to all the settings for all models.
    configurationBuilder.Properties<string>().HaveMaxLength(100);
    configurationBuilder.Properties<decimal>().HavePrecision(16, 2);
  }

  public override Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
  {
    var entries = ChangeTracker.Entries<BaseDomainModel>().Where(
      λ => λ.State == EntityState.Modified || λ.State == EntityState.Added
    );
    // Whenever a save is made to an entity, these fields are now automatically updated:
    foreach (var entry in entries)
    {
      entry.Entity.ModifiedDate = DateTime.UtcNow;
      entry.Entity.ModifiedBy = "Sample User 1";

      if (entry.State == EntityState.Added)
      {
        entry.Entity.CreatedDate = DateTime.UtcNow;
        entry.Entity.CreatedBy = "Sample User";
      }
    }
    return base.SaveChangesAsync(cancellationToken);
  }

  public DateTime GetEarliestTeamMatch(int teamId) => throw new NotImplementedException();
}

public class DeadBallZoneLeagueDbContextFactory : IDesignTimeDbContextFactory<DeadBallZoneLeagueDbContext>
{
  public DeadBallZoneLeagueDbContext CreateDbContext(string[] args)
  {
    var folder = Environment.SpecialFolder.LocalApplicationData;
    var path = Environment.GetFolderPath(folder);

    IConfigurationRoot configuration = new ConfigurationBuilder()
      .SetBasePath(Directory.GetCurrentDirectory())
      .AddJsonFile("appsettings.json")
      .Build();

    var dbPath = Path.Combine(path, configuration.GetConnectionString("SqliteDatabaseName"));

    var optionsBuilder = new DbContextOptionsBuilder<DeadBallZoneLeagueDbContext>();
    optionsBuilder.UseSqlite($"Data Source={dbPath}");

    return new DeadBallZoneLeagueDbContext(optionsBuilder.Options);
  }
}