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. 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<>).

    13 votes
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      1 comment  ·  runtime  ·  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…

      13 votes
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        2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
      • Add option to update model from database project

        It would be great to update the EDMX from a database project. Currently we are working with an database project containing the tables, indexes, stored procedures, types etc... If we are able to update the EDMX directly from the database project, it would remove an extra step to connect with a database. In this way, we don't even need a hosted SQL server to update the EDMX.

        13 votes
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          1 comment  ·  tools  ·  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…

          13 votes
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            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
          • Foreign Key Constraints on Views

            The "create/update modell from database" functions of the EF designer should support foreign key constraints on views.
            As a result of the foreign keys we get navigation properties on the views.

            (In Oracle database it is possible to create (disabled) foreign keys between views.)

            13 votes
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              1 comment  ·  Flag idea as inappropriate…  ·  Admin →
            • Support ignoring columns with database provided default value

              If a database defines a default for a column then the column does not need to be mapped to a conceptual schema property anymore. The column is optional (like nullable columns) and the model should validate even if no mapping for the column is defined.

              12 votes
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                1 comment  ·  runtime  ·  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()…

                12 votes
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                  1 comment  ·  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 →
                  • 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…

                    12 votes
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                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Allow interception of the creation of dynamic proxies

                      At the moment, the creation of a dynamic proxy for a POCO class is an internal process. I'd like to be able to intercept this proxy creation event (possibly through the service locator) in order to be able to emit additional properties / methods into the dynamic proxy class or to customize the functionality of the existing change tracking / lazy loading code.

                      12 votes
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                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                      • Improve Database First Support

                        Code First is no match for real life situations and also Proxies create lot of runtime problems.

                        We use Dictionary<Type,object> to store Lambda Expressions that are designed to act as Filters for one type. Here is the problem, at runtime code first entity type is a dynamic type leading to following problems.

                        1. Dynamic Type implementation is hidden.
                        2. It does not support INotifyPropertyChanged
                        3. It does not allow us to inspect/validate property with partial methods which we were able to do with Database First (EDMX) Model.
                        4. CreateSourceQuery is hidden, sometimes we want to only execute Any or inspect…

                        12 votes
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                          1 comment  ·  runtime  ·  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 →
                          • 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.

                            11 votes
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                              1 comment  ·  tools  ·  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.

                              10 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

                                10 votes
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                                  0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                • Add polymorphic associations support

                                  Add support for polymorphic associations like <any> and <many-to-any> in NHibernate.

                                  10 votes
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                                    0 comments  ·  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 →
                                    • Visual Studio Database Project integration

                                      Support for updating a Visual Studio Database Project(s) instead of updating the db directly with an ad-hoc file.

                                      Currently 4.0 allows us to generate our database schema from the model but its capabilities are limited and destructive:
                                      unique keys – no support
                                      schema generation – destructive

                                      Database Projects for Visual Studio has already matured and more importantly has the capability of updating schemas without being destructive to the data. It would be nice to see the next designer integrate fully with this product rather than re-invent the wheel. For those of us that manage our databases using Database Projects this…

                                      10 votes
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                                        0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Migrations: Reset migrations function

                                        Currently, people are hacking a way around the issue of needing to Reset migrations: http://stackoverflow.com/questions/11679385/reset-entity-framework-migrations

                                        The current solution means deleting the migration folder and then deleting the migration history table in the DB, and then adding a brand new migration - but then having to comment out the code in the UP()... which works but isn't optimal for example to check db consistency or when having new developers onboard the team and just being able to run Update-Database on their machine.

                                        10 votes
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                                          0 comments  ·  tools  ·  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.
                                          -…

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