Entity Framework Core Feature Suggestions

Welcome! Use this web site to submit ideas and vote for what features you want to see in future versions of Entity Framework Core.

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  1. Future Queries

    I didn´t find any topic about this, but is very important.

    Its described here: https://github.com/loresoft/EntityFramework.Extended#future-queries

    // build up queries
    var q1 = db.Users
    .Where(t => t.EmailAddress == "one@test.com")
    .Future();

    var q2 = db.Tasks
    .Where(t => t.Summary == "Test")
    .Future();

    // this triggers the loading of all the future queries
    var users = q1.ToList();

    7 votes
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      0 comments  ·  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.

      7 votes
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        0 comments  ·  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  ·  Flag idea as inappropriate…  ·  Admin →
        • Support concurrency checks in derived types when using TPT inheritance

          Remove the limitation to perform concurrency checks on derived types. Now you may only use properties from the base type for concurrency checks.

          7 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; }

            7 votes
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              1 comment  ·  Flag idea as inappropriate…  ·  Admin →
            • 7 votes
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                1 comment  ·  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…

                7 votes
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                  2 comments  ·  Flag idea as inappropriate…  ·  Admin →
                • Support for SQL Server Change Data Capture (or at least tables with no primary keys)

                  Change Data Capture is one of the coolest features in SQL Server 2008+. I know it's not core to tailor things for one database technology, but this feature is completely unsupportable in the current EF because EF doesn't allow tables without PKs (and the tables SQL Server gens for CDC have no PKs). Ideally, some sort of real support would be allowed that would allow for some sort of Entity.CDC or something that would string together the tables that an entity uses ... but that is probably a bridge too far.\

                  7 votes
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                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                  • Support SQL Server Schemas/Owners as CLR namespace/classes

                    SQL Server schemas (or owners) should reflect into CLR namspace branches or inner classes.

                    If you have Sales.Customer and Orders.Customer on the database, that shouldn't be Customer and Customer1.

                    7 votes
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                      3 comments  ·  Flag idea as inappropriate…  ·  Admin →
                    • Improve Model First: allow choosing inheritance strategy on a case by case basis

                      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.

                      7 votes
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                        1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                      • Enable extending entity framework model wizard to be able to add new items

                        I want to be able to customize Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.ModelObjectItemWizard
                        So I can add my custom items to Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Gui.ModelBuilderWizardForm like I show on this updated screenshot
                        http://clip2net.com/clip/m407107/8fb72-entity-framework-wizard-customization2-35kb.png?nocache=1

                        In particular I want to add "ASP.NET Identity 2.0 EF Designer model" which will already contain all the entities required for ASP.NET Identity 2.0 to work.

                        6 votes
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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • Support lazy loading proxies on internal POCO classes

                          I'd really like to not have all my model classes declared as public. Please support classes declared as internal. Even if there is a requirement to add InternalsVisibleTo("EntityFramework") or similar to the AssemblyInfo that is fine.

                          6 votes
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                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                          • Cascade Delete and Update Attribute

                            It would be great to have attributes to indicate whether to cascade delete and updates rather than having to use the fluent api.

                            6 votes
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                              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                            • Add Support for custom Extension methods

                              Support extension methods to be defined for entities or generic extensions. As long as the extension returns an IQueryable or expression that only includes supported operations/extensions, then the provider should expand the extension method and replace it in the expression tree with the the returned iqueryable/expression.

                              Thus for the most part, any extension method encountered in the expression that is not supported, should be called to return an expression that can be inserted into the expression tree. So long as the process operators recursively as it is expanding the expression, eventually the expression tree will consist of supported expressions and…

                              6 votes
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                                2 comments  ·  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

                                6 votes
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                                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                • 6 votes
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                                    1 comment  ·  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.

                                    6 votes
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                                      0 comments  ·  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.

                                      6 votes
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                                        0 comments  ·  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.

                                        6 votes
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                                          0 comments  ·  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

                                          6 votes
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                                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
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                                          Entity Framework Core Feature Suggestions

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