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Mastering the Arcane Art of JavaScript-Mancy for C# Developers - Chapter 7: Using LINQ in JavaScript

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using System;

namespace EFCoreDbFunctionsSample.Entities
{
    public class Person
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public DateTime AddDate { get; set; }
    }
}

var usersInfo = context.People.Where(person => (DateTime.Now - person.AddDate).Days <= 10).ToList();

'The LINQ expression 'DbSet<Person>.Where(p => (DateTime.Now - p.AddDate).Days <= 10)'
could not be translated. Either rewrite the query in a form that can be translated,
or switch to client evaluation explicitly by inserting a call to either
AsEnumerable(), AsAsyncEnumerable(), ToList(), or ToListAsync().
See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.'

SELECT [p].[Id], [p].[AddDate], [p].[Name]
FROM [People] AS [p]
WHERE DATEDIFF(Day, [p].[AddDate], GETDATE()) <= 10

namespace EFCoreDbFunctionsSample.DataLayer
{
    public enum SqlDateDiff
    {
        Year,
        Quarter,
        Month,
        DayOfYear,
        Day,
        Week,
        Hour,
        Minute,
        Second,
        MilliSecond,
        MicroSecond,
        NanoSecond
    }

    public static class SqlDbFunctionsExtensions
    {
        public static int SqlDateDiff(SqlDateDiff interval, DateTime initial, DateTime end)
            => throw new InvalidOperationException($"{nameof(SqlDateDiff)} method cannot be called from the client side.");
        public static readonly MethodInfo SqlDateDiffMethodInfo = typeof(SqlDbFunctionsExtensions)
            .GetRuntimeMethod(
                nameof(SqlDbFunctionsExtensions.SqlDateDiff),
                new[] { typeof(SqlDateDiff), typeof(DateTime), typeof(DateTime) }
            );
    }
}

 dotnet ef dbcontext scaffold "Data Source=(local);Initial Catalog=BloggingCore2016;Integrated Security = true" Microsoft.EntityFrameworkCore.SqlServer -o Entities --context MyDBDataContext --verbose

using System;
using System.Collections.Generic;

namespace Core1RtmEmptyTest.Entities
{
    public partial class Blog
    {
        public Blog()
        {
            Post = new HashSet<Post>();
        }

        public int BlogId { get; set; }
        public string Url { get; set; }

        public virtual ICollection<Post> Post { get; set; }
    }
}

using System;
using System.Collections.Generic;

namespace Core1RtmEmptyTest.Entities
{
    public partial class Post
    {
        public int PostId { get; set; }
        public string Content { get; set; }
        public string Title { get; set; }

        public virtual Blog Blog { get; set; }
        public int BlogId { get; set; }
    }
}

using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;

namespace Core1RtmEmptyTest.Entities
{
    public partial class MyDBDataContext : DbContext
    {
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer(@"Data Source=(local);Initial Catalog=BloggingCore2016;Integrated Security = true");
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Blog>(entity =>
            {
                entity.Property(e => e.Url).IsRequired();
            });

            modelBuilder.Entity<Post>(entity =>
            {
                entity.HasOne(d => d.Blog)
                    .WithMany(p => p.Post)
                    .HasForeignKey(d => d.BlogId);
            });
        }

        public virtual DbSet<Blog> Blog { get; set; }
        public virtual DbSet<Post> Post { get; set; }
    }
}

 public virtual Blog Blog { get; set; }

 public virtual ICollection<Post> Post { get; set; }

<primary key property name>
<navigation property name><primary key property name>
<principal entity name><primary key property name>

  public virtual Blog Blog { get; set; }
  public int BlogId { get; set; }

modelBuilder.Entity<Post>(entity =>
{
    entity.HasOne(d => d.Blog)
             .WithMany(p => p.Post)
             .HasForeignKey(d => d.BlogId);
});

 dotnet ef dbcontext scaffold "Data Source=(local);Initial Catalog=BloggingCore2016;Integrated Security = true" Microsoft.EntityFrameworkCore.SqlServer -o Entities --context MyDBDataContext --verbose -a

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Core1RtmEmptyTest.Entities
{
    public partial class Blog
    {
        public Blog()
        {
            Post = new HashSet<Post>();
        }

        public int BlogId { get; set; }

        [Required]
        public string Url { get; set; }

        [InverseProperty("Blog")]
        public virtual ICollection<Post> Post { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Core1RtmEmptyTest.Entities
{
    public partial class Post
    {
        public int PostId { get; set; }
        public string Content { get; set; }
        public string Title { get; set; }

        [ForeignKey("BlogId")]
        [InverseProperty("Post")]
        public virtual Blog Blog { get; set; }
        public int BlogId { get; set; }
    }
}

using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;

namespace Core1RtmEmptyTest.Entities
{
    public partial class MyDBDataContext : DbContext
    {
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer(@"Data Source=(local);Initial Catalog=BloggingCore2016;Integrated Security = true");
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
        }

        public virtual DbSet<Blog> Blog { get; set; }
        public virtual DbSet<Post> Post { get; set; }
    }
}

  [ForeignKey("BlogId")]
  [InverseProperty("Post")]
  public virtual Blog Blog { get; set; }
  public int BlogId { get; set; }

   [InverseProperty("Blog")]
  public virtual ICollection<Post> Post { get; set; }

public virtual Blog Blog { get; set; }

 var firstPost = context.Post.First();
Console.WriteLine(firstPost.Blog.Url);

 System.NullReferenceException
Object reference not set to an instance of an object.

 var firstPost = context.Post.Include(x => x.Blog).First();
Console.WriteLine(firstPost.Blog.Url);

var blogs = context.Blogs
                              .Include(blog => blog.Posts)
                              .Include(blog => blog.Owner)
                              .ToList();

var blogs = context.Blogs
                              .Include(blog => blog.Posts)
                                      .ThenInclude(post => post.Author)
                              .ToList();

var blogs = context.Blogs
                              .Include(blog => blog.Posts)
                                 .ThenInclude(post => post.Author)
                                        .ThenInclude(author => author.Photo)
                              .ToList();

var blogs = context.Blogs
                              .Include(blog => blog.Posts)
                                  .ThenInclude(post => post.Author)
                                      .ThenInclude(author => author.Photo)
                              .Include(blog => blog.Owner)
                                    .ThenInclude(owner => owner.Photo)
                              .ToList();

var blogs = context.Blogs
                              .Include(blog => blog.Posts)
                              .Select(blog => new
                               {
                                  Id = blog.BlogId,
                                  Url = blog.Url
                               })
                               .ToList();

 CONSTRAINT [FK_Post_Blog_BlogId] FOREIGN KEY ([BlogId]) REFERENCES [Blog] ([BlogId]) ON DELETE CASCADE

modelBuilder.Entity<Post>()
                    .HasOne(p => p.Blog)
                    .WithMany(b => b.Posts)
                    .OnDelete(DeleteBehavior.Cascade);

modelBuilder.Entity<Post>()
                    .HasOne(p => p.Blog)
                    .WithMany(b => b.Posts)
                    .IsRequired();