How add a migration to a EntityFramework 7 project - entity-framework

Question

I'm starting a new project using asp.net 5 and EF 7 VS2015.
I selected the project template with the user mangagement.
Now I want to add some classes to the dbContext and have a new schema created with my new classes.
This is wat my ApplicationDbContext looks like:
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public DbSet<Candidate> Candidates { get; set; }
public DbSet<Manager> Managers { get; set; }
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
// Customize the ASP.NET Identity model and override the defaults if needed.
// For example, you can rename the ASP.NET Identity table names and more.
// Add your customizations after calling base.OnModelCreating(builder);
builder.Entity<Candidate>().Key(x => x.Id);
builder.Entity<Manager>().Key(x => x.Id);
}
}
I have not been able to recreate or migrate my database to a version with my Candidates and Managers table.
Which commands do I have to enter where to make my DB appear? My friend Google and Bing have pointed me in every direction, but none of the things I found worked.

Answer 1

You need to use the new dnx commands, for example:
dnx . ef migration add NameOfMigration
And to run the migration:
dnx . ef migration apply

Answer 2

I found this CodeProject article that shows how to deal with migration on ASP .NET 5 project but in summary you need to apply the commands that #DavidG recommended in his answer.
I know this is not your case, but if you were working with a Class Library project, then the commands you would need to run are these:
Open the Package Manager Console:
Run Add-Migration MigrationName If it is the first time, it will to scaffold a migration to create the initial set of tables for your model, otherwise it will scaffold the next migration based on changes you have made to your model since the last migration was created.
Run Apply-Migration to apply the new migration to the database.
If your database doesn’t exist yet, it will be created for you
before the migration is applied.
To apply these commands you need to configure a database provider first. You can do this by overriding OnConfiguring in your DbContext class or in the AddDbContext method when setting up services.
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer(#"Server=(localdb)\mssqllocaldb;Database=EFGetStarted.ConsoleApp;Trusted_Connection=True;");
}

Answer 3

As per ASP.NET 5 and Entity 7 RC1 the steps would be:
Add a dependency to the Entity Commands nuget package in your main project. So in your project.json you should see this dependency
"EntityFramework.Commands": "7.0.0-rc1-final"
Add an alias command to use from console later on. So in your project.json you would have the following ef command:
"commands": {
"ef": "EntityFramework.Commands",
"web": "Microsoft.AspNet.Server.Kestrel"
}
Open a console and run the migration commands. For example:
D:\Projects\MyProject\src\MyProject.Web.Api>dnx ef migrations add Initial --targetProject MyProject.Data.SqlServer
Then review the Migration that ef will create in your project and apply the changes to your database (the database that is configured for your project) with the following command:
D:\Projects\MyProject\src\MyProject.Web.Api>dnx ef database update
Notice that the attribute --targetProject allows you to specify the project where your DbContext is and where the folder Migrations would be created. If your DbContext is in your main project you can omit that (but I recommend to have a class library project for everything persistance related so this command would be handy)
In your Startup.cs is where you usually would have the configuration for Entity including the connection string. This is a basic example:
public Startup(IHostingEnvironment env)
{
// Set up configuration sources.
var builder = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
builder.AddEnvironmentVariables();
Configuration = builder.Build();
}
public IConfigurationRoot Configuration { get; private set; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddEntityFramework()
.AddSqlServer()
.AddDbContext<KuneDbContext>(options => {
options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"]);
});
// Add identity here http://docs.asp.net/en/latest/tutorials/your-first-aspnet-application.html
services.AddMvc();
// Add application services
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
if (env.IsDevelopment())
{
app.UseBrowserLink();
app.UseDeveloperExceptionPage();
app.UseDatabaseErrorPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
// For more details on creating database during deployment see http://go.microsoft.com/fwlink/?LinkID=615859
try
{
using (var serviceScope = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>()
.CreateScope())
{
serviceScope.ServiceProvider.GetService<KuneDbContext>()
.Database.Migrate();
}
}
catch { }
}
app.UseIISPlatformHandler();
app.UseStaticFiles();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
//Seed Data if you want to load some test data in the DB
//SeedData.Initialize(app.ApplicationServices);
}
// Entry point for the application.
public static void Main(string[] args) => WebApplication.Run<Startup>(args);
}