How to add mappings by namespace in Fluent NHibernate

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In my application, I need to talk to multiple databases. I am handling this in NHibernate by creating one SessionFactory per database (I assume this is the correct thing to do). So I have two sets of models (one per database), and two sets of Fluent NHibernate ClassMap<> mappings. Both are in the same project (separated by namespace) and I'd like to keep it that way.

The problem comes when creating the SessionFactory. As far as I can see, Fluent NHibernate has basically two methods for adding mappings:

    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<UserClassMap>())
    .Mappings(m => m.FluentMappings.Add<UserClassMap>()

If I use the first overload, then my session factories get all the mappings for both databases. If I use the second, I have to specify each individual ClassMap. I'd like something like FluentMappings.AddFromNamespace(). Is there a way to do this?

It's odd that FluentNHibernate supports this type of filtering for automapping, but not for ClassMaps. It shouldn't be too hard to add this feature yourself, though, via the magic of extension methods. Try this:

public static FluentMappingsContainer AddFromAssemblyOf<T>(
    this FluentMappingsContainer mappings,
    Predicate<Type> where)
{
    if (where == null)
        return mappings.AddFromAssemblyOf<T>();

    var mappingClasses = typeof(T).Assembly.GetExportedTypes()
        .Where(x => (typeof(IMappingProvider).IsAssignableFrom(x)
                || typeof(IExternalComponentMappingProvider).IsAssignableFrom(x))
            && where(x));

    foreach (var type in mappingClasses)
    {
        mappings.Add(type);
    }

    return mappings;
}

... and use it like this:

m.FluentMappings.AddFromAssemblyOf<UserClassMap>(t => t.Namespace.StartsWith("One.Of.The.Two.Namespaces"));

nhibernate, It's odd that FluentNHibernate supports this type of filtering for automapping, but not for ClassMap s. It shouldn't be too hard to add this feature yourself, though,  NHibernate Fluent – How to Add Composite Keys for AutoMapping Convention Posted on September 8, 2018 September 8, 2018 by Robin Leave a comment .NET Core , NHibernate Post Views: 3,060

Fluent configuration, Add the reference of the Fluent NHibernate from Nuget on your project and add a class CustomerMap.cs: namespace Project.Mappings { public class  In this chapter, we will be covering fluent NHibernate. Fluent NHibernate is another way of mapping or you can say it is an alternative to NHibernate's standard XML mapping files. Instead of writing XML (.hbm.xml files) documents. With the help of Fluent NHibernate, you can write mappings in strongly typed C# code. In Fluent NHibernate mappings are compiled along with the rest of your application.

... AutoMap.AssemblyOf<Person>().Where(x => x.Namespace.EndsWith("Domain")) ...

How to use Fluent NHibernate with auto mappings, Store = this; Staff.Add( employee ); } } }. Here's an outline of the Program class: namespace FluentNHibernateConsole { public class Program  Normally, NHibernate uses XML files to determine how each entity in the domain model relates to each table in the database. Fluent NHibernate allows us to bypass this laborious step with auto mappings. We can add other conventions here, but all we need to get our application running is to turn cascading on.

There is no way to do this. I recommend separating the namespaces out into separate projects. Remember:

Separate namespaces, same project when logical separation makes sense. Separate namespaces, separate projects when physical separation makes sense.

In this case, since you can't separate by namespace in nhibernate mappings, physical separation makes sense. You can, however, get around this with with fluent automaps that use a .Where or a ShouldMap configuration. Look up fluent automaps and see if that can get you where you want to be.

Creating mappings fluently, Add a new folder named Mappings . Create a new class named ProductMapping with the following code: Copy. using FluentNHibernate.Mapping; namespace  The hibernate-mapping tag contains the namespace and assembly project information. The class tag contains the name of the entity on the project and the table which is been mapped. The id tag contains the mapping for the primary key where the column is specified by the column tag and generator tag define how the id is generated.

Chapter 5. Basic O/R Mapping, Mapping.ByCode available since NHibernate 3.2, or Fluent NHibernate. All XML mappings should declare the XML namespace shown. dynamic-insert (​optional - defaults to false): Specifies that INSERT SQL should be generated at  A custom mapping will be required to achieve these changes. Custom mappings can be added by: Creating a *. hbm. xml file for the saga data class; Fluent NHibernate (popular separate fluent API) NHibernate.Mapping.Attributes; Loquacious Configuration (native fluent API) There are other options, but these are the most frequently used.

How to work with Fluent NHibernate in C#, Fluent NHibernate provides a Fluent API also enables you to use LINQ ORM tool NHibernate that can be used to create mapping between you should ensure that the following namespaces have been added to your class. Contents[show] Fluent NHibernate has a concept called Auto Mapping, which is a mechanism for automatically mapping all your entities based on a set of conventions. Auto mapping utilises the principal of convention over configuration. Using this principal, the auto mapper inspects your entities

NHibernate 4.x Cookbook, Add a new folder named MappingWithFluent to the MappingRecipes project. Mapping.Model; using FluentNHibernate.Mapping; namespace MappingRecipes​  This of course was a snarky in the moment tweet as is the title of this post, but I do actually think that auto mapping is the best usage pattern for Fluent NHibernate. And I wanted to expand on that a bit and share my reasoning. The primary reason people use Fluent NHibernate is to get away from xml based mapping files that look like this.

Comments
  • +1 I discovered something similar, but this approach is more general.
  • This doesn't map SubClassMaps, as they aren't assignable from IMappingProvider. stackoverflow.com/a/6207141/206297 has an expanded list of MappingProviders that should be checked.
  • This is exactly what I needed - thank you! This should just be built into FNH.
  • I'm not using automappings, I'm specifying my mappings explicitly with ClassMap<> mappings.