问题
I have an ASP.NET Core 2.1.0 application using EF Core 2.1.0.
How do I go about seeding the database with Admin user and give him/her an Admin role? I cannot find any documentation on this.
回答1:
As user cannot be seeded in a normal way in Identity just like other tables are seeded using .HasData() of .NET Core 2.1.
Seed Roles in .NET Core 2.1 using code given below in ApplicationDbContext Class :
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
// 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);
modelBuilder.Entity<IdentityRole>().HasData(new IdentityRole { Name = "Admin", NormalizedName = "Admin".ToUpper() });
}
Seed Users With Roles by Following the steps given below.
Step 1: New class creation
public static class ApplicationDbInitializer
{
public static void SeedUsers(UserManager<IdentityUser> userManager)
{
if (userManager.FindByEmailAsync("abc@xyz.com").Result==null)
{
IdentityUser user = new IdentityUser
{
UserName = "abc@xyz.com",
Email = "abc@xyz.com"
};
IdentityResult result = userManager.CreateAsync(user, "PasswordHere").Result;
if (result.Succeeded)
{
userManager.AddToRoleAsync(user, "Admin").Wait();
}
}
}
}
Step 2: Now Modify ConfigureServices method in Startup.cs class.
Before Modification:
services.AddDefaultIdentity<IdentityUser>()
.AddEntityFrameworkStores<ApplicationDbContext>();
After Modification:
services.AddDefaultIdentity<IdentityUser>().AddRoles<IdentityRole>()
.AddEntityFrameworkStores<ApplicationDbContext>();
Step 3: Modify parameters of Configure Method in Startup.cs class.
Before Modification :
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
//..........
}
After modification :
public void Configure(IApplicationBuilder app, IHostingEnvironment env, UserManager<IdentityUser> userManager)
{
//..........
}
Step 4 : Calling method of our Seed (ApplicationDbInitializer) class:
ApplicationDbInitializer.SeedUsers(userManager);
回答2:
Actually a User Entity can be seeded in OnModelCreating, one thing to consider: the IDs should be predefined. If type string is used for TKey identity entities, then there is no problem at all.
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
// any guid
const string ADMIN_ID = "a18be9c0-aa65-4af8-bd17-00bd9344e575";
// any guid, but nothing is against to use the same one
const string ROLE_ID = ADMIN_ID;
builder.Entity<IdentityRole>().HasData(new IdentityRole
{
Id = ROLE_ID,
Name = "admin",
NormalizedName = "admin"
});
var hasher = new PasswordHasher<UserEntity>();
builder.Entity<UserEntity>().HasData(new UserEntity
{
Id = ADMIN_ID,
UserName = "admin",
NormalizedUserName = "admin",
Email = "some-admin-email@nonce.fake",
NormalizedEmail = "some-admin-email@nonce.fake",
EmailConfirmed = true,
PasswordHash = hasher.HashPassword(null, "SOME_ADMIN_PLAIN_PASSWORD"),
SecurityStamp = string.Empty
});
builder.Entity<IdentityUserRole<string>>().HasData(new IdentityUserRole<string>
{
RoleId = ROLE_ID,
UserId = ADMIN_ID
});
}
回答3:
Here is how I did it in the end. I created a DbInitializer.cs class to do the seeding of all my data (including the admin user).
Here's the code for the methods relating to the seeding of the user accounts:
private static async Task CreateRole(RoleManager<IdentityRole> roleManager,
ILogger<DbInitializer> logger, string role)
{
logger.LogInformation($"Create the role `{role}` for application");
IdentityResult result = await roleManager.CreateAsync(new IdentityRole(role));
if (result.Succeeded)
{
logger.LogDebug($"Created the role `{role}` successfully");
}
else
{
ApplicationException exception = new ApplicationException($"Default role `{role}` cannot be created");
logger.LogError(exception, GetIdentiryErrorsInCommaSeperatedList(result));
throw exception;
}
}
private static async Task<ApplicationUser> CreateDefaultUser(UserManager<ApplicationUser> userManager, ILogger<DbInitializer> logger, string displayName, string email)
{
logger.LogInformation($"Create default user with email `{email}` for application");
ApplicationUser user = new ApplicationUser
{
DisplayUsername = displayName,
Email = email,
UserName = email
};
IdentityResult identityResult = await userManager.CreateAsync(user);
if (identityResult.Succeeded)
{
logger.LogDebug($"Created default user `{email}` successfully");
}
else
{
ApplicationException exception = new ApplicationException($"Default user `{email}` cannot be created");
logger.LogError(exception, GetIdentiryErrorsInCommaSeperatedList(identityResult));
throw exception;
}
ApplicationUser createdUser = await userManager.FindByEmailAsync(email);
return createdUser;
}
private static async Task SetPasswordForUser(UserManager<ApplicationUser> userManager, ILogger<DbInitializer> logger, string email, ApplicationUser user, string password)
{
logger.LogInformation($"Set password for default user `{email}`");
IdentityResult identityResult = await userManager.AddPasswordAsync(user, password);
if (identityResult.Succeeded)
{
logger.LogTrace($"Set password `{password}` for default user `{email}` successfully");
}
else
{
ApplicationException exception = new ApplicationException($"Password for the user `{email}` cannot be set");
logger.LogError(exception, GetIdentiryErrorsInCommaSeperatedList(identityResult));
throw exception;
}
}
My Program.cs looks like this:
public class Program
{
public static async Task Main(string[] args)
{
var host = BuildWebHost(args);
using (var scope = host.Services.CreateScope())
{
var services = scope.ServiceProvider;
Console.WriteLine(services.GetService<IConfiguration>().GetConnectionString("DefaultConnection"));
try
{
var context = services.GetRequiredService<PdContext>();
var userManager = services.GetRequiredService<UserManager<ApplicationUser>>();
var roleManager = services.GetRequiredService<RoleManager<IdentityRole>>();
var dbInitializerLogger = services.GetRequiredService<ILogger<DbInitializer>>();
await DbInitializer.Initialize(context, userManager, roleManager, dbInitializerLogger);
}
catch (Exception ex)
{
var logger = services.GetRequiredService<ILogger<Program>>();
logger.LogError(ex, "An error occurred while migrating the database.");
}
}
host.Run();
}
public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.Build();
}
回答4:
If you are referring to Identity users, the way we did was to add hardcoded values in DbContext.OnModelCreating:
builder.Entity<Role>().HasData(new Role { Id = 2147483645, Name = UserRole.Admin.ToString(), NormalizedName = UserRole.Admin.ToString().ToUpper(), ConcurrencyStamp = "123c90a4-dfcb-4e77-91e9-d390b5b6e21b" });
And user:
builder.Entity<User>().HasData(new User
{
Id = 2147483646,
AccessFailedCount = 0,
PasswordHash = "SomePasswordHashKnownToYou",
LockoutEnabled = true,
FirstName = "AdminFName",
LastName = "AdminLName",
UserName = "admin",
Email = "admin@gmail.com",
EmailConfirmed = true,
InitialPaymentCompleted = true,
MaxUnbalancedTech = 1,
UniqueStamp = "2a1a39ef-ccc0-459d-aa9a-eec077bfdd22",
NormalizedEmail = "ADMIN@GMAIL.COM",
NormalizedUserName = "ADMIN",
TermsOfServiceAccepted = true,
TermsOfServiceAcceptedTimestamp = new DateTime(2018, 3, 24, 7, 42, 35, 10, DateTimeKind.Utc),
SecurityStamp = "ce907fd5-ccb4-4e96-a7ea-45712a14f5ef",
ConcurrencyStamp = "32fe9448-0c6c-43b2-b605-802c19c333a6",
CreatedTime = new DateTime(2018, 3, 24, 7, 42, 35, 10, DateTimeKind.Utc),
LastModified = new DateTime(2018, 3, 24, 7, 42, 35, 10, DateTimeKind.Utc)
});
builder.Entity<UserRoles>().HasData(new UserRoles() { RoleId = 2147483645, UserId = 2147483646 });
I wish there was some better/cleaner way to do it.
来源：https://stackoverflow.com/questions/50785009/how-to-seed-an-admin-user-in-ef-core-2-1-0