Entity Framework Feature Suggestions

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Entity Framework Feature Suggestions

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  1. 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 →
        • namespace complex types

          Place complex types generated by the database in their own namespaces. Right now, when a stored procedure is imported, a complex type is generated and placed in no particular namespace, so all of the complex types are floating about.

          Perhaps instead, use the namespace that's been given to the model.

          6 votes
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            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
          • Native support for defining filtered unique and/or nonclustered indexes

            IndexAttribute does not allow me to definite filtered indexes. Instead, I have to execute raw SQL.

            6 votes
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              0 comments  ·  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 →
              • Keep verbose naming scheme (avoid 'DbContext', etc)

                It sounds kind of silly, I know, but one thing that is attractive about the .NET Framework is how verbose and organized it is. 'Shortcut names' like 'DbContext' and the like that we're seeing in CTP4 are really annoying, because they make me look back at other languages where you sit down to read the code and half of it feels like a poorly written text message.

                6 votes
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                  1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                • 6 votes
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                    1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                  • Add the ability to persist TimeSpan values (and others) as strings

                    The immediate need is to be able to map between TimeSpan values on the CLR side and their equivalent string representations on the database side.

                    Currently TimeSpan can only be mapped to the SQL time datatype, which does not make much sense since the time SQL type is meant for storing time-of-day while TimeSpan is meant to represent an arbitrary amount of time. Mapping between the two limits the TimeSpan to a 24 hours interval, which rarely makes sense.

                    In our current DAL we do this by persisting TimeSpan values as strings, calling TimeSpan.ToString() on the way down and TimeSpan.Parse()…

                    6 votes
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                      0 comments  ·  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 →
                      • Allow stored procedures to be used to navigate relationships

                        There are many developers who are in shops that don't allow non-stored procedure calls to SQL Server. It would be really nice if there was something in EF where we could select a relationship in the EF designer, go to its mapping and select a stored procedure for each role in the relationship. It might go something like this:

                        1.We would create a relationship between two entitties, say Author and Book. Both entities would be required to expose foreign keys (the developer can make them private if they want).
                        2.A stored procedure would be created that would navigate from each…

                        6 votes
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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • Provide Refactor Into Existing Complex Type

                          In the designer we can Refactor Into New Complex Type, but once we have done this we cannot Refactor all other instances into Existing Complex Type.

                          6 votes
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                            0 comments  ·  tools  ·  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 →
                            • Add Language Pack's or the possibility to create your own.

                              At this moment there are no Language Pack's available for EF5. (found a link for version 4.1 but none higher)

                              As a workaround I'm implementing custom Data Annotation's on the entities.

                              It would be great if I could create my own language pack for Dutch.

                              6 votes
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                                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • create an secondary index from edmx designer tool for generate database

                                when create a database from model some times need create secondary index for restrict some case of data

                                6 votes
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                                  1 comment  ·  tools  ·  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 →
                                      • Use names defined in linq query in generated sql

                                        Currently if you have something like

                                        select new { Year = c.DateEntered.Year }

                                        the generated sql uses C1 for the column name. I would find it very useful if the used Year.

                                        6 votes
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                                          0 comments  ·  tools  ·  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 →
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