Create new DbContext constructor with external Options.

And install related packages.

EntityFrameworkCore.API/EntityFrameworkCore.API.csproj

@@ -10,4 +10,7 @@
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.3" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="../EntityFrameworkCore.Data/EntityFrameworkCore.Data.csproj" />
+  </ItemGroup>
 </Project>

EntityFrameworkCore.API/Program.cs

@@ -1,9 +1,31 @@
+using EntityFrameworkCore.Data;
+using Microsoft.EntityFrameworkCore;
+
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
 builder.Services.AddOpenApi();
 
+var sqliteDatabaseName = builder.Configuration.GetConnectionString("SqliteDatabaseName");
+var folder = Environment.SpecialFolder.LocalApplicationData;
+var path = Environment.GetFolderPath(folder);
+var dbPath = Path.Combine(path, sqliteDatabaseName);
+var connectionString = $"Data Source={dbPath}";
+
+builder.Services.AddDbContext<DeadBallZoneLeagueDbContext>(options => {
+    options.UseSqlite(connectionString)
+    .UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking)
+    .LogTo(Console.WriteLine, LogLevel.Information);
+
+    if (!builder.Environment.IsProduction())
+    {
+         // Do not allow this in Production.
+        options.EnableSensitiveDataLogging();
+        options.EnableDetailedErrors();
+    }
+});
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.

EntityFrameworkCore.API/appsettings.json

@@ -5,5 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "SqliteDatabaseName": "DeadBallZoneLeague_EFCore.db"
+  }
 }

EntityFrameworkCore.Data/DeadBallZoneLeagueDbContext.cs

@@ -1,36 +1,26 @@
 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
 {
-  private string DbPath;
+  public DeadBallZoneLeagueDbContext(DbContextOptions<DeadBallZoneLeagueDbContext> options) : base(options)
-  public DeadBallZoneLeagueDbContext()
   {
-    // In Ubuntu 24.04, the file is created here: /home/user/.local/share
+    // This constuctor allows it to accept the options set from other instances, such as in the API project.
-    var folder = Environment.SpecialFolder.LocalApplicationData;
-    var path = Environment.GetFolderPath(folder);
-    DbPath = Path.Combine(path, "DeadBallZoneLeague_EFCore.db");
   }
+
   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 OnConfiguring(DbContextOptionsBuilder optionsBuilder)
-  {
-    optionsBuilder.UseSqlite($"Data source={DbPath}")
-      // .UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking) // Do not use tracking, set globally on all queries.
-      .LogTo(Console.WriteLine, LogLevel.Information)
-      .EnableSensitiveDataLogging() // Do not allow this in Production.
-      .EnableDetailedErrors(); // Do not allow this in Production.
-  }
-
   protected override void OnModelCreating(ModelBuilder modelBuilder)
   {
     // modelBuilder.ApplyConfiguration(new TeamConfiguration());
@@ -54,3 +44,24 @@ public class DeadBallZoneLeagueDbContext : DbContext
 
   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);
+  }
+}

EntityFrameworkCore.Data/EntityFrameworkCore.Data.csproj

@@ -9,6 +9,9 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.3" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.3" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.3" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="9.0.3" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="9.0.3" />
   </ItemGroup>
 
   <ItemGroup>

README.md

@@ -100,6 +100,18 @@ Note that the [Microsoft.EntityFrameworkCore.Tools](https://www.nuget.org/packag
 
 * `dotnet add package Microsoft.EntityFrameworkCore.Sqlite --version 9.0.3`
 
+[Microsoft.Extensions.Configuration](https://www.nuget.org/packages/Microsoft.Extensions.Configuration/9.0.3)
+
+* `dotnet add package Microsoft.Extensions.Configuration --version 9.0.3`
+
+[Microsoft.Extensions.Configuration.FileExtensions](https://www.nuget.org/packages/Microsoft.Extensions.Configuration.FileExtensions/9.0.3)
+
+* `dotnet add package Microsoft.Extensions.Configuration.FileExtensions --version 9.0.3`
+
+[Microsoft.Extensions.Configuration.Json](https://www.nuget.org/packages/Microsoft.Extensions.Configuration.Json/9.0.3)
+
+* `dotnet add package Microsoft.Extensions.Configuration.Json --version 9.0.3`
+
 ## Tips for efficient querying
 
 * Use indexes.