NOTE: Relevant to EF 6 You can use IndexAttribute as mentioned but with Fluent API instead of DataAnnotations which will do the trick: modelBuilder .Entity<Person>() .Property(t => t.Name) .HasColumnAnnotation( “Index”, new IndexAnnotation(new IndexAttribute(“IX_Name”) { IsUnique = true })); Unfortunately there is no other way to create unique indexes using Fluent API. There is an open … Read more
The single biggest challenge I have experienced as a consumer of fluent interfaces is that most of them aren’t really fluent intefaces — instead they are really instances of what I tend to refer to as ‘legible interfaces’. A fluent interface implies that its primary goal is to make it easy to SPEAK it whereas … Read more
Char is not valid primitive type for entity framework = entity framework doesn’t map it. If you check CSDL reference you will see list of valid types (char is not among them). Database char(1) is translated as string (SQL to CSDL translation). Char is described as non-unicode string with fixed length 1. The only ugly … Read more
Overwriting __new__() works if you want to modify the string on construction: class caps(str): def __new__(cls, content): return str.__new__(cls, content.upper()) But if you just want to add new methods, you don’t even have to touch the constructor: class text(str): def duplicate(self): return text(self + self) Note that the inherited methods, like for example upper() will … Read more
No, you cannot. In Python, all data (classes, methods, functions, etc) defined in C extension modules (including builtins) are immutable. This is because C modules are shared between multiple interpreters in the same process, so monkeypatching them would also affect unrelated interpreters in the same process. (Multiple interpreters in the same process are possible through … Read more
What I’d do is have NinjaBuilder keep the operations as a list of delegates, rather than applying them, and only apply them when .Build is called. This would allow you to make them conditional: public class NinjaBuilder { List<Action<Ninja>> builderActions = new List<Action<Ninja>>(); public Ninja Build() { var ninja = new Ninja(); builderActions.ForEach(ba => ba(ninja)); … Read more
Try to use some Extension methods. static class FluentManager { public static T WithFirstName<T>(this T person, string firstName) where T : FluentPerson { person.FirstName = firstName; return person; } public static T WithId<T>(this T customer, long id) where T : FluentCustomer { customer.ID = id; return customer; } } class FluentPerson { public string FirstName … Read more
After Migrations was introduced in EF 4.3 you can now add indexes when modifying or creating a table. Here is an excerpt from the EF 4.3 Code-Based Migrations Walkthrough from the ADO.NET team blog namespace MigrationsCodeDemo.Migrations { using System.Data.Entity.Migrations; public partial class AddPostClass : DbMigration { public override void Up() { CreateTable( “Posts”, c => … Read more
I agree that this is subjective. For the most part I avoid method chaining, but recently I also found a case where it was just the right thing – I had a method which accepted something like 10 parameters, and needed more, but for the most time you only had to specify a few. With … Read more
It’s rather simple, really. You have a series of mutator methods that all return the original (or other) object. That way, you can keep calling methods on the returned object. <?php class fakeString { private $str; function __construct() { $this->str = “”; } function addA() { $this->str .= “a”; return $this; } function addB() { … Read more