entity-framework-ctp5

Given a EF-Code First CTP5 entity layout like: public class Person { ... } which has a collection of: public class Address { ... } which has a single association of: public class Mailbox { ... } I want to do: PersonQuery.Include(x => x.Addresses).Include("Addresses.Mailbox") WITHOUT using a magic string. I want to do it using a lambda expression. I am aware what I typed above will compile and will bring back all Persons matching the search criteria with their addresses and each addresses' mailbox eager loaded, but it's in a string which irritates me. How do I do it without a string? Thanks

Attempting to cutover our EF4 solution to EF CTP5, and ran into a problem. Here's the relevant portion of the model: The pertinent relationship: - A single County has many Cities - A single City has a single State Now, i want to perform the following query: - Get all Counties in the system, and include all the Cities, and all the State's for those Cities. In EF4, i would do this: var query = ctx.Counties.Include("Cities.State"); In EF CTP5, we have a strongly typed Include, which takes an Expression<Func<TModel,TProperty>> . I can get all the Cities for the County no problem: var query = ctx

I have this class and table: public class Foo { public Guid Id {get;set;} public string Name {get;set;} } create table Foo ( id uniqueidentifier primary KEY DEFAULT (newsequentialid()), name nvarchar(255) ) the problem is that when i try to save new foo the first one goes with the 0000-000-00 ... id and the second also, so I get constraint exception anybody knows a fix ? Devart Have you set Identity StoreGeneratedPattern? You can do it in the OnModelCreating method: modelBuilder.Entity<Foo>().Property(o => o.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); or using the

I'm using Entity Framework CTP5 and Code First. I need to change the Collation for a specific column in SQL Server. I believe the default collation is SQL_Latin1_General_CP1_CI_AS, but I need to change this one column colllation to SQL_Latin1_General_CP1_CS_AS (Case Sensitive). Is there a way to use ModelBuilder in Code First to change a specific column collation? BarDev Ladislav Mrnka Model builder doesn't allow this but you can create custom database initializer and execute ALTER TABLE command. The example will be the same as this one creating custom index. 来源： https://stackoverflow.com

I'm having problems with a circular reference when i try and serialise an object returned via EF4 CTP5. Im using the code first approach and simple poco's for my model. I have added [ScriptIgnore] attributes to any properties that provide a back references to an object and annoyingly every seems to work fine if i manually instantiate the poco's, i.e. they serialise to JSON fine, and the scriptignore attribute is acknowledged. However when i try and serialise an object returned from the DAL i get the circular reference exception "A circular reference was detected while serializing an object of

I'm creating a POCO model to use with entity framework code first CTP5. I'm using the decoration to make a property map to a PK column. But how can I define a PK on more then one column, and specifically, how can I control order of the columns in the index? Is it a result of the order of properties in the class? Thanks! You can specify the column order in the attributes, for instance: public class MyEntity { [Key, Column(Order=0)] public int MyFirstKeyProperty { get; set; } [Key, Column(Order=1)] public int MySecondKeyProperty { get; set; } [Key, Column(Order=2)] public string

In this blog post: EF4 Code First Control Unicode and Decimal Precision, Scale with Attributes , Dane Morgridge used attributes to control the creation of different types on your database. ...And I found this pretty unique BTW!!! How do I generate money type fields in my resulting database using code first API of EF CTP5, if is possible to do it from your model, using conventions or attributes? Sorry about my English is not my main language. Thanks in advance. For example, consider this Invoice class: public class Invoice { public int InvoiceId { get; set; } public decimal Amount { get; set; }