Can a mapping class be created in Entity Framework similar to this one in Fluent NHibernate?

Question

I want to create a mapping class similar to the one mentioned below. I want to convert this Fluent NHibernate mapping class to Entity Framework.

Fluent NHibernate

using FluentNHibernate.Mapping;

using MyBlog.Core.Objects;


public class PostMap: ClassMap<Post>
{
    public PostMap()
    {
        Id(x => x.Id);

        Map(x => x.Title)
            .Length(500)
            .Not.Nullable();

        Map(x => x.ShortDescription)
            .Length(5000)
            .Not.Nullable();

        Map(x => x.Description)
            .Length(5000)
            .Not.Nullable();

        Map(x => x.Meta)
            .Length(1000)
            .Not.Nullable();

        Map(x => x.UrlSlug)
            .Length(200)
            .Not.Nullable();

        Map(x => x.Published)
            .Not.Nullable();

        Map(x => x.PostedOn)
            .Not.Nullable();

        Map(x => x.Modified);

        References(x => x.Category)
            .Column("Category")
            .Not.Nullable();

        HasManyToMany(x => x.Tags)
            .Table("PostTagMap");
    }
}

Is NHibernate support available with Hosting Services? Is it easily available with any ASP.NET Hosting or only selected services use it?

please fix the code formatting to include the **using** into the code. I can't edit the text (I need to add 6 words). stupid limitation. — magicandre1981, Dec 21 '13 at 07:20

Ilya Palkin · Accepted Answer · 2013-12-29T07:51:00.547

3

Yes, Entity Framework has the similar mappings.

NHibernate:

public PostMap()
{
    Map(x => x.Title)
        .Length(500)
        .Not.Nullable();
}

Entity Framework:

public class YourDomainModelContext : DbContext
{
    public YourDomainModelContext() { }
    ...
    public DbSet<Post> Posts { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<Post>()
            .Property(u => u.Title)
            .HasMaxLength(500);
    }
}

You can get more information in these blog-posts:

edited Dec 29 '13 at 07:51

answered Dec 22 '13 at 08:55

Ilya Palkin

14,687
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Thanks. I also want to know when is the need to create such a mapping. Is this mandatory? – RKh Dec 29 '13 at 05:31
No, this mapping is not mandatory. If it is needed to customise your DB, you can use either Fluent API within `OnModelCreating()` or Data Annotations on Domain Entities' properties. I prefer Fluent API. – Ilya Palkin Dec 29 '13 at 07:50

score 0 · Answer 2 · edited May 23 '17 at 12:07

0

For EF4 and EF5 there are Fluent API generators, but for EF6 not. I'm also searching for one that works.

edited May 23 '17 at 12:07

Community

1
1

answered Dec 21 '13 at 07:20

magicandre1981

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Can a mapping class be created in Entity Framework similar to this one in Fluent NHibernate?

2 Answers2