Entity Framework Feature Suggestions

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Entity Framework Feature Suggestions

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  1. ColumnAttribute to set the name of a navigation property backing onto a real column

    [Column("OwnerId")]
    public virtual User Owner { get; set; }
    some interest was expressed by the team on this so it may be in...

    5 votes
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      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • Weak references in the object context

      Weak references would allow the context to cache objects but allow the caller can use a single context without wasting memory.

      Example:
      An embedded device where there is no clean unit of work. When something is loaded into the device it must process it, and when that something is done the user may remove it at some later point. It processes many somethings simultaneously, up to maximum capacity.

      For now, we either use NoTracking objects or create a context for each object. This induces a lot of unnecessary overhead.

      A weak reference would mean one context, no memory growth, but…

      4 votes
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        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
      • Provide means to clear the database

        Provide a method on the Database class to remove all data from the database without knowing anything about the underlying physical database schema, relationships and constraints.

        This is critical in order to effectively test EF related code. While one way is to recreate the database every test, it has security and performance implications.

        4 votes
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          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
        • EF ODBC Support

          I have seen NHibernate have the capability to connect ODBC data source. I could not do that in EF now. I want to connect Informix through EF with ODBC Driver. I did not want to use Informix data provider for this type of setup.

          4 votes
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            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
          • [DefaultValue(...)] is not handled by Code First migration

            In a column I can add [DefaultValue] attribute, but at the end it is ignored by the migration step. Confused. Please add support for this.

            4 votes
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              1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
            • Property to inform when entity is being materialized

              If you perform business logic in the entitys OnPropertyChanged event handler, eg. calculating some related properties or changing a state property when certain properties are changed, your code is also run when the entity is fetched from the database. This is not a real change of the entity, it is just being loaded. It would be nice if the EntityObject class had a property bool IsMaterializing that was true so you could break out of the OnPropertyChanged handler.

              4 votes
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                0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
              • Upgrade model to include FK

                I'd love a tool for upgrading the model from version 1 to version 4.

                4 votes
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                  0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                • Provide an Entity Framework Factory similar to the ADO.Net Provider which allows easy swapping betwe

                  Provide an Entity Framework Factory similar to the ADO.Net Provider which allows easy swapping between different Entity Framework models such as SQL Server, Oracle, MySQL, DB2 etc. simply by providing the appropriate database provider information in a manner similar to the current ADO.Net Database Provider Factory.

                  4 votes
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                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • Add attribute for federated tables

                    Add a "FederatedOn" attribute to the "Table" data annotation so Code First entities can be associated to a SQL Azure Federations federated member. For instance: [Table("Pessoas", FederatedOn = "TenantId=TenantId")]
                    As an alternative, allow an equivalent attribute to be declared on the entity property that is the federation distribution key (e.g. the TenantId property).

                    4 votes
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                      0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                    • Eager Loading With Filters

                      We should be able to specify what we want to include inside the include statement. This way, if we have a lot of information, we will not have a performance hit.

                      For example:

                      var blogs1 = context.Blogs
                      .Include(b => b.Posts)
                      .ToList();

                      This is fine, but imagine you have a LOT of posts. If you want to have only Posts from today, why not having something to filter it down directly from the SQL.
                      var blogs1 = context.Blogs
                      .Include(b => b.Posts, d=>d.Date>=DateTime.Now)
                      .ToList();

                      4 votes
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                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                      • Improve conditionals on Table-per-Hierarchy

                        It never works when your conditionals are based on a int column so where Type=1 etc. Only seems to work for when some column Is Null. It complains about mapping when you try and do this. Seems impossible to work around

                        4 votes
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                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                        • Add Entity Framework Releases to Microsoft Reference Source Server

                          Make it quick and easy to see the source code during debugging and allowing Visual Studio to load the source on demand as it does for the core .net framework.

                          4 votes
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                            0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                          • Better support for mainframe databases like DB2

                            Please add support for connecting to and using mainframe databases like DB2. We can't wait for IBM to get their act together and produce a usable EF provider.

                            4 votes
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                              0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                            • Create a convention to automatically convert null string properties on a model to empty strings

                              Create a convention to automatically convert null string properties on a model to empty strings

                              4 votes
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                                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • get context from entity

                                some times we need to know the context from entity

                                4 votes
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                                  1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • TPH should use Discriminator Expression

                                  Allow via DataAnnotation or Fluent API which column in an abstract class is the Discriminator. For example, in a Vehicle table you could identity a VehicleType [int] as the discriminator.

                                  Then in derived class (e.g., PassengerCar) you could identity what values (or set of values) distinguish the type in the table. For example, [DiscriminatorExpression("VehicleType in (1,4,7,10)")]

                                  4 votes
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                                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Persistant Ignorant Base Types

                                    Supporting base types that don't need database serialization would be ideal. For instance, an abstract class

                                    "Layout", and then the classes that inherit from it are persisted in the database, but the Layout class is just an abstract template.

                                    4 votes
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                                      3 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Suppress specific errors/warnings

                                      When doing "Model First" development THERE IS NO BACKING STORE. I don't want to create a phony one. I don't want a store or any mapping to one ... period. I'll deal with that when the time comes. But I should be able to model away w/o a map or store.

                                      Ok ... you should provide a warning ... as you do. during validation I get a raft of 11007 and 11008 "errors" and a 2062 error during compilation.

                                      But I should be able to suppress those warnings and errors as well.

                                      In Model First you do NOT specify mapping…

                                      4 votes
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                                        0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Make objectcontext work with multiple edmx definitions

                                        When using a framework with seperate database tables it is difficult the keep them apart. We have to merge them for each project to make joins possible but then we have to backport each change to the original framework database. It would cleaner if you can use one objectcontext for the 2 edmx files or make sub-edmx files or include them.

                                        4 votes
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                                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Support more validation rules

                                          Besides data annotations also make it possible to define custom annotations, inter entity rules, security and inter record rules and more. For example: http://www.softfluent.com/images/cfe-screens/07-cfe_addrule.png

                                          4 votes
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                                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
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