Entity Framework Feature Suggestions

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Entity Framework Feature Suggestions

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  1. Navigation properties in composite ids without need for the corresponding scaler property

    If you have a class like

    public class CustomerAddress
    {
    public virtual Customer Customer { get; set; }
    public virtual Address Address { get; set; }
    public virtual string AddressType { get; set; }
    public virtual DateTime ModifiedDate { get; set; }
    }

    you should be able to create a composite id like this

    HasKey(a => new { a.Customer, a.Address });

    without defining CustomerId and AddressId properties

    8 votes
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      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • Self tracking

      Allow using self tracking in case of "ApplyChanges" to object holding different references (same entitiy loaded from different context or pass using WCF) but actuality they are the same entity (have the same EntityKey) then the entities will be identify by the entity key and not the specific reference.

      8 votes
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        0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
      • Allow commit only selected changes

        There are cases, when we would like to commit only selected changes from changeset. Let's say in complex hierachy ef is not able to resolve all relations and set correct id's, so we would save first parent items, then child items with correct parent id's.

        7 votes
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          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
        • Improved API for Migrations

          The API for DbMigrator is lacking. I would like to see .UpOne(), .DownOne(), .Up(n), .Down(n) methods to attempt to perform that number of migrations.

          .Update("0") is an odd-looking way to completely thrash the DB. Something like .RollbackAll() would be a very simple implementation and have a much clearer name.

          Having .Update() take an additional optional parameter to completely rollback first, and apply all migrations from scratch might be very nice, especially in a test or development environment.

          Generating an SQL script for logging purposes and then performing the DB migration must currently (I believe) be done in two steps. A…

          7 votes
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            1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
          • Use CTE (with clause) instead of derived tables in generated queries.

            SQL Generated code would be much more readeable if you would use common table expressions instead of derived table. Just choose the name you want for the CTE and move the code generated for the derived table into the CTE, and replace the derived table expression by the name of the CTE. The resulting code is then no more indented. You can also take the opportunity to properly name the CTE to give an hint about which part of the linq expression result in the CTE generation. This improvement should not be complex to implement, and would help us and…

            7 votes
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              0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
            • Support for multiple result sets in .ExecuteFunction() and .ExecuteQuery()

              public Tuple‹T1, T2› ExecuteQuery‹T1, T2›(string query) { ... }
              public Tuple‹T1, T2, T3› ExecuteQuery‹T1, T2, T3›(string query) { ... }

              7 votes
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                1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
              • Database VIEW creation support and specific mapping of entites to views.

                Currently, to get Code First to create a database with a VIEW, the CREATE VIEW sql statement must be hacked a couple of Context.Database.ExecuteSqlCommand's. One to drop the table that EF created for the entities you're mapping to it and another to create the view using the same name as the table EF assumes is still there.

                When mapping an entity to a view, you have to use modelBuilder.Entity<T>.ToTable and treat the view as a table. Entity Framework assumes the view is still a table and assumes it's read/write. A new method of .ToView might be added to tell EF…

                7 votes
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                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • Update database without seeding

                  It would be great to be able to do an "update-database" without having to execute the seeding commands as well. We are seeding quite a lot of meta data into our system, and it is a waste of time to wait for seeding each time we update/manipulate our model.

                  A flag in command prompt like

                  update-database -noseeding

                  would suffice.

                  7 votes
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                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • support tables with the same name but diffrent schema

                    assume we have a table named Transaction with a schema GL and another one named Transaction but belongs to AR schema,
                    until now , could not be mapped in code-first

                    7 votes
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                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Query serialization / deserialization

                      ** SUGGESTION **
                      Native support for query serialization and deserialization (to XML) decoupled from a concrete ObjectContext, including query parametrization and correct management of lambda expressions (e.g. using expression expansion as in LinqKit).

                      ** WHY **
                      We've developed a set of classes that allow a query to be written in the client layer and executed in the service layer via web services (with POCO entities). After the query is written normally using linq to entities and obtaining an IQueryable<T> object, this implementation transparently does the following:

                      CLIENT side:
                      - Expands the query expression tree to correctly manage lambda expressions.
                      -…

                      7 votes
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                        0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                      • Allow foreign key columns to be shared between a subset of TPH subclasses

                        Scenario in the post http://entityframework.codeplex.com/workitem/583 works only for columns that are not foreign keys.

                        For example we have BaseEntity and three inherited entities:
                        InheritedEntity1.Name
                        InheritedEntity2.SpecialStatus
                        InheritedEntity3.SpecialStatus

                        SpecialStatus is entity stored in separate table.

                        BaseEntity table will have columns 'Name', 'SpecialStatus_Id', 'SpecialStatus_Id1'

                        Try to change the name of the column:
                        modelBuilder.Entity<InheritedEntity2>().HasOptional(p => p.SpecialStatus).WithOptionalDependent().Map(i => i.MapKey("SpecialStatus_Id"))
                        modelBuilder.Entity<InheritedEntity3>().HasOptional(p => p.SpecialStatus).WithOptionalDependent().Map(i => i.MapKey("SpecialStatus_Id"))

                        and get an ModelValidationException:
                        "One or more validation errors were detected during model generation:
                        SpecialStatus_Id: Name: Each property name in a type must be unique. Property name 'SpecialStatus_Id' is already defined.
                        "

                        7 votes
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                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                        • Add support for dynamically extended queries as per LinqKit

                          LinqKit has shown that is possible to make the creation of queries much more dynamic, with them being composed at run time dependent on external conditions. nHibernate is good at this and LinqKit helps, but it would be nice to have an official solution.

                          7 votes
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                            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                          • Bulk Object Graph Persistence

                            I would like to see the ability to persist an entire object graph in one DB call. Currently it is way to chatty with the DB which makes it really slow to persist.

                            6 votes
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                              3 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                            • Allow adding fluent code to each entity, to minimize the mess in the context

                              There should be a way (perhaps by implementing an interface), to add fluent code separately to each entity instead of adding it all in the OnModelCreating method.
                              The OnModelCreating base method should call all the entities that implement that interface and call OnModelCreating(context) of it.
                              In this way the bunch of fluent code in the main context, especially if it's a large one, would tidy up in the individual entities.
                              Of course, this is already simply doable, but I think this should go out the box.

                              6 votes
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                                1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                              • Foreign key (from attribute and fluent) without navigation property

                                Right now you have to define a navigation property set a foreign key constraint on a column.
                                For people that want to achieve some independence from EF (using the repository pattern, for example, and a key-value store as a possible alternative), plainer POCOs with just ids are important.
                                For example, with the repository pattern, I am right now able to use the same data classes and the same IRepository for an EF backed data store and a Redis-backed one.

                                Defining a foreign key without the navigation property is still important and useful for data integrity.

                                If could be something like …

                                6 votes
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                                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • Support read-only mapping to tables without key

                                  Allow mapping of database views without requiring the Key Attribute

                                  When mapping entitis to Views, it´s common that no Key can be set, bescause the view does not provide it and you can´t map it. The idea is:

                                  * Make it possible to map to Views (or tables) in a read only fashion that does not require the Key Attribute

                                  6 votes
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                                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • 6 votes
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                                      1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Instantiate "many" nav properties with empty list

                                      I've found that in Code First entities, my "many" properties such as

                                      property List<People> SomePropertyName {get; set;}

                                      are null when the entity is instantiated. This breaks the common "convention" of just simply adding entities to the list:

                                      You can't just
                                      MyEntity.SomeManyProperty.Add(SomeOtherEntityInstance);

                                      You have to do
                                      MyEntity.SomeManyProperty = new List<SomeOtherEntity> { SomeOtherEntityInstance };

                                      but, of course, you can't just do that, because you might wipe out an existing list, if there is one, so you must then do a check first. Ugly.

                                      As a lesser evil, I've resorted to instantiating empty lists in the constructor of my entities but this is…

                                      6 votes
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                                        4 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Optional Convention that assigns Default Value to not nullable types

                                        When using code first with an existing database, the "can not assign null to a non nullable type" exception can be realy painfull, because the compiler gives no warning, when i project a int? to a int.

                                        It would be very usefull to have a Convention / Configuration that enables the automatic use of GetValueOrDefault for these cases.

                                        6 votes
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                                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • support for ordering in Include()

                                          using the include() with a 1 to many relationship, the data are loaded in the list without any specific order, forcing often to reload directly specifying the sort order

                                          5 votes
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                                            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
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