Entity Framework Feature Suggestions

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Entity Framework Feature Suggestions

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  1. Columns' uniqueness awareness. (Unique Indexes)

    Several DataBases give you the possibility to create UNIQUE INDEXES, both to support Unique Constraint on it or just to ensure the uniqueness of some kind of data.

    In both cases, this kind of information doesn't have a proper place into the model and this makes the DbContext unable to determine the proper order of the Insert/Update/Delete commands within the commands tree.

    The reason is pretty clear to me, if within the same SaveChanges() you delete a row or you update a index column(s) value of a row and you add a brand new row with the same original index…

    12 votes
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      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • Add FILEGROUP Support

      It should be possible to create tables, indices, etc. on different file groups in order to improve performance.

      12 votes
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        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
      • Write EntitySet as XML like DataTable.WriteXML()

        Ability to save contents of a loaded entity set into an xml file to persist into hard disk then load again like is possible in data tables

        12 votes
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          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
        • Improve Model First: allow user choosing inheritance strategy on a case by c

          In my models, there are hierarchies that are persisted using TPT while others are persisted using TPH. It would be great if we could choose the strategy and then have Generate Database From Model create the tables depending on our choice.

          12 votes
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            1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
          • Object graph deep clone and object shallow Clone

            It would make sense to allow shallow and deep cloning as a default requirement. There are currently some work-arounds, like serializing and then deserializing or even detach and re-attach, but each has their downfalls and it makes sense to me to include such functionality in by default to ensure highest performance and stability

            11 votes
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              0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
            • Encryption of Columns

              Would be nice to be able to map encryption to a column. have a convention based or override using a
              function (Func<>).

              11 votes
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                1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
              • Interchangeable Backing Database

                I would like to write my code against the EF and have it work with SqlServer Express and SQlServer Compact (or even MySQL and Oracle). It would be great if I could swap these out at runtime, even, pointing to different databases as needed. This would require some improvements to SQLServer Compact, but also some improvements to EF.

                11 votes
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                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • Stop DefiningQuery being overwritten by edmx designer

                  The defining query element in the edmx XML needs adding by hand, but when reusing the update model from database it is overwritten.

                  It was be very useful if the defining queries are not overwritten, as we primarily work in a database first way... so the team isn't familiar with the edmx xml... however we have specific features requiring DefiningQuery which could be overwritten often... it means that DefiningQuery couldn't be a long term solution for us as it'll cause to much pain to producitvity & gotcha bugs.

                  11 votes
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                    0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                  • Define RelatedProperty on an inherited foreign key

                    Allow mapping to entity in a derived class based on a property in base class.

                    Normally, we create a [RelatedTo] property for a foreign key defined in the same class.

                    But it would be quite handy to be able to define [RelatedTo] on a Foreign Key defined in the base class.

                    11 votes
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                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Merge EDMX designer with Class Designer

                      Visual Studio already contains Class Designer and UML Class Desinger. I don't need another so merge all them

                      10 votes
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                        2 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                      • Support all mapping inheritance strategies

                        Support all mapping inheritance strategies, well documented, as mentioned here: http://www.agiledata.org/essays/mappingObjects.html

                        10 votes
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                          0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                        • 10 votes
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                            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                          • Better auditing interception

                            Together will all the fabulous features you are introducing I think it could be find room also for a sort of Audit System more business oriented.
                            We love the new Log & Interceptor hooks but we also need to pull out of the DbContext an easy POCO object based on 3 level of entities like this:

                            (S)avedChangset (1 instance for every SaveChanges() call with at least Time, User, Application & Session Info)
                            (E)ntities (a collection of the Entities changed within the same "Saved Changset" with at least TableName & PK)
                            (A)ttributes (a collection of Attributes changed within the same "Entity",…

                            10 votes
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                              0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                            • Generate the Association objects based on the Foriegn Key Column Name

                              Generate the Association objects in a model based on the Foriegn Key Column Name rather than "Association1", "Association2" etc

                              10 votes
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                                2 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • Ability To Create Read-Only Entities

                                There are times I want to show data like a report where I don't need all the required fields from the DB because I will NEVER write the data back. It would be nice to be able to create an entity, limit which CRUD operations it supports, and allow some required fields to not be present in the entity if I don't support CREATE or UPDATE...

                                10 votes
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                                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                • Code First better attributes

                                  * Decimal Scale/Precision
                                  [Column(DecimalScale=18, DecimalPrecision=2)]

                                  * Nullable indication (For string is essential):
                                  [Column(NotNull = true)]

                                  * All in one:
                                  [Column("TestName", NotNull = false, MaxLength = 250, MinLength = 3, Default = ""])
                                  public String Name { get; set; }

                                  [Column(NotNull = true, MaxLength = 0, Default = 0])
                                  public int Count { get; set; }

                                  10 votes
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                                    1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Custom Accessors (Getters/Setters) in CodeFirst

                                    I should be able to put basic data validation on all of my public fields.

                                    9 votes
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                                      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Option to use Inner Join SQL when Eager Loading (AKA IncludeRequired method)

                                      When trying to load related entities using the "Include" eager loading feature of EF, it always generates SQL that uses an LEFT OUTER JOIN e.g.

                                      from m in Customer.Includes("Orders")

                                      will always generate the SQL:

                                      SELECT ......
                                      FROM Customers
                                      LEFT OUTER JOIN Orders....

                                      This is not always desirable, especially when you only want to retrieve Customers that have at least one or more related Orders. By forcing the generated SQL to always use LEFT OUTER JOIN, it's going to load all Customers regardless of whether they have related Orders or not. This can become extremely inefficient, especially when there are lots…

                                      9 votes
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                                        1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Updating the F# SqlEntityConnection Type Provider for EF 6

                                        The F# SqlEntityConnection Type Provider is a third way to interact with Entity framework (with the other two being an .edmx file and Code First).
                                        http://msdn.microsoft.com/en-us/library/hh362322.aspx

                                        This Type Provider doesn't support the updated low-level API changes that EF 6 requires, as far as I can tell. I'd love to have an updated version that supports the async features of EF 6.

                                        9 votes
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                                          1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Entity Designer: custom metadata editor

                                          I would like to add my custom metadata using Entity Designer and then use it within T4 templates. To achive it with current version I must write my own extension for Visual Studio - it is not convenient.

                                          9 votes
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                                            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
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