Entity Framework Feature Suggestions

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Entity Framework Feature Suggestions

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  1. Add polymorphic associations support

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

    9 votes
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      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
    • Clear, Complete, and Accurate Documentation

      Break the mold! Provide clear concise documentation that describes the API, the intended use for each API, the purpose and use (with examples of the arguments to each method), and explanatory samples and snippets that are both complete and clearly show the intened information.

      9 votes
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        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
      • Mapping n to n relation in a table with discriminator like TPH

        The most interesting side effect of TPH is that the DB need less tables and the overview is much better. Another interesting way to reduce the number of tables in a DB is to map the n to n relations in one table with a discriminator like the TPH.
        The xsd schema allow already to add a condition to the associated set mapping (n to n) but it's not supported from EF.
        This forum topic describe the problem and how it could be solved.
        http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/7144757d-c124-4932-b2bf-d0ab845597fd

        9 votes
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          0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
        • Allow only some CUD operations to map to stored procedures

          At present, mapping stored procedures is an all or nothing proposition. Either you map each of the Insert, Update and Delete procedures or none at all. It would be great to utilize the generated functionality as is but still have the option to override just one of the three.

          9 votes
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            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
          • Update model from database should update complex types returned by stored procedures

            When using option 'Update model from databes' VS should update complex types returned by SP - now every SP have to be updated manually

            9 votes
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              1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
            • 8 votes
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                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
              • let me save expensive intermediate LINQ results in temp table

                LINQ-to-Entities should offer an anaogous operator to AsEnumerable() but instead of materializing results on the client, it would materiailze results on the server (e.g. a temp table for SQL Server), allowing subsequent operators to re-use intermediate results without risking additional server recomputation or requiring a round-trip from client to server.

                The underlying requirement is to make it easier to build and maintain performant LINQ queries that use millions of rows, many complex joins, I/O intensive calculations like running totals or self-joins, or all of the above.

                For these kinds of queries in T-SQL, a good way to get predictable performance…

                8 votes
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                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • Allow "normally"/correctly formatted connection strings

                  Connection string sections now needs two connection strings: one for EF to use, and one for all other standard .Net Framework APIs utilising the same database.

                  This is kinda bizarre, violating DRY, KISS etc.

                  The requested change:
                  Have a config section for EF.
                  Have all non-standard connection string settings set here.
                  Have it reference the regular connection string section to get the standard settings for the database.
                  Combine the settings within the framework in order to make a connection.

                  Simple, no?

                  8 votes
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                    3 comments  ·  Flag idea as inappropriate…  ·  Admin →
                  • Support Pessimistic Concurrency

                    Allow a Select with UpdLock which locks all returned entities in the Database. This is a basic requirement to program for example a ticket sales portal with entity framework! So far it's not possible and I still have to stick to NHibernate :(

                    8 votes
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                      0 comments  ·  runtime  ·  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.

                      8 votes
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                        1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                      • Deprecate Timestamp annotation in favor of RowVersion

                        Considering that "timestamp" has been deprecated in SQL Server for some time and is a synonym for the more precise denomination "rowversion", introduce the RowVersion data annotation in EF as an alternative to Timestamp and mark the current Timestamp annotation as deprecated.
                        http://msdn.microsoft.com/en-us/library/ms182776.aspx

                        8 votes
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                          1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                        • Navigation properties in composite ids without need for the corresponding scaler property

                          If you have a class like

                          public class CustomerAddress
                          {
                          public virtual Customer Customer { get; set; }
                          public virtual Address Address { get; set; }
                          public virtual string AddressType { get; set; }
                          public virtual DateTime ModifiedDate { get; set; }
                          }

                          you should be able to create a composite id like this

                          HasKey(a => new { a.Customer, a.Address });

                          without defining CustomerId and AddressId properties

                          8 votes
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                            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                          • Self tracking

                            Allow using self tracking in case of "ApplyChanges" to object holding different references (same entitiy loaded from different context or pass using WCF) but actuality they are the same entity (have the same EntityKey) then the entities will be identify by the entity key and not the specific reference.

                            8 votes
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                              0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                            • WF / EF integration

                              It would be nice if you could somehow link the WF designer with the EF designer so that entities can more easily be integrated with workflows.

                              A form designer link would also be beneficial. Define the entities, start with a form generated is a similar way as is done today with ASP.Net Dynamic data but have the ability to make changes to the templates visually. Then allow us link everything together with workflow.

                              Have integrated templates for deployment as WPF, Silverlight, ASP.Net and SharePoint 2012 deployments.

                              8 votes
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                                0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                              • SqlDependency / query notification

                                in ADO.NET classic thers an option to get a notification from SQL when data changes in the database, using the SqlDependency class for specific queries. i would like to see this supported in the next EF

                                8 votes
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                                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • Allow commit only selected changes

                                  There are cases, when we would like to commit only selected changes from changeset. Let's say in complex hierachy ef is not able to resolve all relations and set correct id's, so we would save first parent items, then child items with correct parent id's.

                                  7 votes
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                                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • 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  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Improved API for Migrations

                                      The API for DbMigrator is lacking. I would like to see .UpOne(), .DownOne(), .Up(n), .Down(n) methods to attempt to perform that number of migrations.

                                      .Update("0") is an odd-looking way to completely thrash the DB. Something like .RollbackAll() would be a very simple implementation and have a much clearer name.

                                      Having .Update() take an additional optional parameter to completely rollback first, and apply all migrations from scratch might be very nice, especially in a test or development environment.

                                      Generating an SQL script for logging purposes and then performing the DB migration must currently (I believe) be done in two steps. A…

                                      7 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…

                                        7 votes
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                                          2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Allow adding fluent code to each entity, to minimize the mess in the context

                                          There should be a way (perhaps by implementing an interface), to add fluent code separately to each entity instead of adding it all in the OnModelCreating method.
                                          The OnModelCreating base method should call all the entities that implement that interface and call OnModelCreating(context) of it.
                                          In this way the bunch of fluent code in the main context, especially if it's a large one, would tidy up in the individual entities.
                                          Of course, this is already simply doable, but I think this should go out the box.

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