Question
I'm trying to figure out how to add and set the value of a custom column in the Migrations history table. I've figured out how to add the column with a custom SqlServerHistoryRepository like this:
class MyHistoryRepository : SqlServerHistoryRepository
{
public MyHistoryRepository(HistoryRepositoryDependencies dependencies) : base(dependencies)
{
}
protected override void ConfigureTable(EntityTypeBuilder<HistoryRow> history)
{
base.ConfigureTable(history);
history.Property<DateTime>("Applied").HasDefaultValue(DateTime.Now);
history.Property<string>("UserStamp");
}
}`
I'm creating my data layer in a library that targets .NET Standard. I've created an IDesignTimeDbContextFactory for the migrations that looks like this.
public class MyDbContextFactory : IDesignTimeDbContextFactory<MyContext>
{
public MyContext CreateDbContext(string[] args)
{
var optionsBuilder = new DbContextOptionsBuilder<MyContext>();
optionsBuilder.UseSqlServer("connectionString",
ob => ob.MigrationsAssembly(this.GetType().Assembly.GetName().Name))
.ReplaceService<IHistoryRepository, MyHistoryRepository>();
return new MyContext(optionsBuilder.Options);
}
}
How can I pass a value for UserStamp into the migrations history table?
Accepted Answer
You can use dependency injection to pass any service directly into your implementation of IHistoryRepository.
For instance, to read a value from a file you can do the following:
public class MyHistoryRepository : NpgsqlHistoryRepository
{
private readonly IConfiguration _config;
public MyHistoryRepository(
HistoryRepositoryDependencies dependencies,
IConfiguration config) : base(dependencies)
{
_config = config;
}
protected override void ConfigureTable(EntityTypeBuilder<HistoryRow> history)
{
base.ConfigureTable(history);
history.Property<DateTime>("Applied").HasDefaultValue(DateTime.Now);
history.Property<string>("UserStamp")
.HasDefaultValue(_config["UserStamp"] ?? "");
}
}
public class MyDbContextFactory : IDesignTimeDbContextFactory<MyContext>
{
public MyContext CreateDbContext(string[] args)
{
var services = new ServiceCollection();
IConfiguration config = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("config.json")
.Build();
// in your case this would probably be 'AddEntityFrameworkSqlServer'
services.AddEntityFrameworkNpgsql();
services.AddSingleton<IConfiguration>(config);
services.AddScoped<IHistoryRepository, MyHistoryRepository>();
var optionsBuilder = new DbContextOptionsBuilder<MyContext>();
optionsBuilder.UseNpgsql(config.GetConnectionString("DefaultConnection"))
.UseInternalServiceProvider(services.BuildServiceProvider());
return new MyContext(optionsBuilder.Options);
}
}
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