C# Core 2.0 - 根据另一个模型中的数据从一个模型获取数据？

Question

我正在使用 .NET Core 2.0

我有 2 张桌子：

Movies
ID | Name | AuthorId
----------------------
1  | AAAA | 1
2  | BBBB | 1
3  | CCCC | 1
4  | DDDD | 2

Reviews
ID | FilmId | AuthorId | SomeText
------------------------------------
1  | 1        | 1        | this is horror
2  | 1        | 2        | this is comendy
3  | 3        | 1        | it may be horror
4  | 3        | 2        | it is definitely comedy, not horror

我的模特是：

class Movie {
    [Key]
    public int ID { get; set; }
    public string Name { get; set; }
    public int AuthorId { get; set; }

    public List<Review> Reviews { get; set; }
}

class Review {
    [Key]
    public int ID { get; set; }
    public string SomeText { get; set; }
    public int AuthorId { get; set; }

    public int FilmId  { get; set; }
    public Movie Film { get; set; }
}

我的背景是：

public class MyContext : DbContext
    {
        public DbSet<Movie> Movie { get; set; }
        public DbSet<Review> Review { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Movie>().HasMany(m => m.Reviews).WithOne(r => r.Film);
        }
    }

现在我想做这样的查询：

SELECT * FROM Movies m JOIN Reviews r ON (m.ID == r.FilmId) WHERE m.AuthorId = 1 AND (r.AuthorID = 3 OR r.SomeText LIKE '%definitely%');

预期结果应该是CCCC.

目前我有：

List<Movie> movies = _context.Movie.Include(m => m.Reviews.Select(r => r.AuthorId == 3 || r.SomeText.Contains("definitely"))).ToList();

如何用这个符号表达上面的查询？

但是我确实得到了：

InvalidOperationException: The property expression 'm => {from Review r in m.Reviews select (([r].AuthorId == __user_ID_0) OrElse [r].SomeText.Contains("definitely"))}' is not valid. The expression should represent a property access: 'r => r.MyProperty'. For more information on including related data, see http://go.microsoft.com/fwlink/?LinkID=746393.

我已经阅读了这篇文章，但它没有给我任何帮助。

Answer 1

我认为这个 linq 查询 returns 是正确的结果（因为我无法测试它）

List<Movie> movies = _context.Movie.where(m => m.AuthorId == 1 && m.Reviews.Any(r => 
r.AuthorId == 3 ||  r.SomeText.Contains("definitely"))).ToList();

C# Core 2.0 - 根据另一个模型中的数据从一个模型获取数据？

C# Core 2.0 - get data from one model based on data in another model?

c#

linq

entity-framework

asp.net-core-2.0

.net-core-2.0