Entity Framework Feature Suggestions

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  1. 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 →
    • Persistent caching of auto-compiled queries

      I know that EF code first automatically compiles queries and caches the results. But "Cold" queries are so slow.. Is possible to persist auto-compiled queries somewhere in the database so EF won't need to re-compile them again if that cache is lost (app restarted).

      6 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 →
        • Improve performance of adding many entities to DbContext (DetectChanges, AutoDetectChangesEnabled)

          The performance hit of adding (and possibly other operations) many entities to the context is so big, that you've introduced the AutoDetectChangesEnabled switch https://msdn.microsoft.com/en-gb/data/jj556205.aspx. This increases the code complexity and leads to nasty bugs. This is not ok and should be redesigned to work fast out-of-box. E.g. by upgrading from EF5 to EF6, due to this feature, the performance of some code has degraded by many orders of magnitude

          6 votes
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            0 comments  ·  runtime  ·  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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              1 comment  ·  Flag idea as inappropriate…  ·  Admin →
            • Show diagram nodes under the EDMX node in solution explorer

              At the moment if I want to work on a specific diagram, I have to open the default diagram in the solution explorer, open the model browser, then open the diagram I'm interested in. Can we have diagrams listed as nodes underneath the EDMX nodes in solution explorer, allowing us to go straight to the diagram we are actually interested in?

              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 →
                • 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 →
                    • Custom identity generator support

                      I'd like to have a custom identity generator support which would allow more advanced ID generation like HiLo-generator (or even sequence based hi/lo ID gneration). This would (for example) help reducing the amount of database accessed/communication which should result in a speed up when adding a batch of new records through EF.

                      6 votes
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                        0 comments  ·  runtime  ·  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 →
                        • Make Data Annotations more flexible to use and to customize

                          DataAnnotations are only really useful when the rules and the error messages can buble the whole way up to the ui. Some modern ui frameworks already make use of this - e.g. Breeze. But DataAnnotations are just not as flexible as we need them. Some known problems are:

                          - you can define your own error messages within the DataAnotation - but those are not easy to localize. To my mind the decission about displaying the content error message should be left to the client. As the client could possibly be a web page, a smartphone or even a coffee machine…

                          6 votes
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                            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                          • Create method should initializer collection navigation properties

                            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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                              5 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 generic complex types

                                You should support for using generic complex types. Consider scenerio where I would like to create Rage<T> type. Now I must create RangeOfInt32, RangeOfInt64, RangeOfDecimal, etc. It will be also great if that class could be defined outside of the model.

                                6 votes
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                                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • Cross Model Navigation Properties

                                  I've read http://blogs.msdn.com/b/adonet/archive/2008/11/25/working-with-large-models-in-entity-framework-part-2.aspx

                                  but, it's a total mission and I haven't had enough time to get it working. I'd like to add an association which bridges two models using the designer. Both models contain tables from the same database.

                                  6 votes
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                                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Sort and autoformat xml inside .edmx files before saving via EF Designer

                                    Need the EF designer to generate nodes inside .edmx file in exactly the same order they are present in the database (currently a list of entity properties is saved in reverse order in mappings section, also when you update the model from the database schema the ordering is messed up). Also before saving .edmx file EF Designer should auto format the document. This would help significantly with branching, merging and resolving conflicts during merge operations of .edmx files.

                                    Steps to reproduce: (1) Generate EF data model based on an existing database (2) Add a couple of new columns, indexes, foreign…

                                    6 votes
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                                      0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Designer support for user-defined functions (UDFs, including scalar-valued functions)

                                      Scalar function is used usually some custom function to retrieve some only one value.
                                      eg.custom ID not Guid

                                      5 votes
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                                        1 comment  ·  tools  ·  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 →
                                        • Auto Create CRUD stored procedure

                                          EF should have the ability to automatically create basic CRUD stored procedures for every table. These basic CRUD stored procedures will only focus on a single table and all it's columns.

                                          An advanced feature would be the ability to auto generate CRUD stored procedures that take into account parent and child tables or many to many scenarios, etc.

                                          Other features would be to create stored procedures that allow for paging and streaming of large amounts of data. Say you have a web page that list contacts and you want ot show the 10th page. It would be ice to autogenerate…

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