Fluent API -> Mapping -> Entity Framework

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using ConsoleBlog.Models;

namespace ConsoleBlog.DataAccess
{
    public class BlogContext : DbContext
    {
        //call base class with connection string name
        public BlogContext()
        : base("ForumDb")
        {

        }

        //Fluent API
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            // class with configuratios for Tag table
            modelBuilder.Configurations.Add(new TagMappings());

            modelBuilder.Entity<Post>().Property(x => x.Content).IsFixedLength().HasMaxLength(255);
            base.OnModelCreating(modelBuilder);
        }

        public DbSet<Category> Categories { get; set; }
        public DbSet<Post> Posts { get; set; }
        public DbSet<PostAnswer> PostAnswers { get; set; }
        public DbSet<Tag> Tags { get; set; }
    }
}

namespace CodeFirst.DataAccess
{
    using System.Data.Entity.ModelConfiguration;

    using CodeFirst.Models;

    public class TagMappings : EntityTypeConfiguration<Tag>
    {
        public TagMappings()
        {
            this.HasKey(x => x.TagId);
            this.Property(x => x.Text).IsUnicode(true);
            this.Property(x => x.Text).HasMaxLength(255);
        }
    }
}