Product.cs

    public class Product
    {
        public int Id { get; set; } 

        public string Name { get; set; }

        public decimal Price { get; set; }

        public DateTime CreationDate { get; set; }

        public int CategoryId { get; set; }

        public Category Category { get; set; }

        public virtual ICollection<FieldValue> FieldValues  { get; set; }

        public int ManufacturerId { get; set; }

        public Manufacturer Manufacturer { get; set; }

        public virtual ICollection<Discount> Discounts { get; set; }

        public virtual ICollection<RelatedProduct> RelatedProducts { get; set; }

        public virtual ICollection<Review> Reviews { get; set; }

        public virtual ICollection<ProductPicture> Pictures { get; set; }

        public virtual ICollection<OrderItem> OrderItems { get; set; }
        public virtual ICollection<RelatedProduct> ProductsRelatedTo { get; set; }
        public ICollection<Discount> DiscountsRelatedTo { get; set; }
    }

    public class Picture
    {
        public int Id { get; set; }

        public string Url { get; set; }
    }

    public class ProductPicture
    {
        public int Id { get; set; }

        public int ProductId { get; set; }

        public Product Product { get; set; }

        public int PictureId { get; set; }

        public Picture Picture { get; set; }

        public bool IsMain { get; set; }
    }

    public class OrderItem
    {
        public int Id { get; set; }

        public int ProductId { get; set; }

        public Product Product { get; set; }

        public int OrderId { get; set; }

        public Order Order { get; set; }
    }

    public class Order
    {
        public int Id { get; set; }

        public virtual IEnumerable<OrderItem> OrderItems { get; set; }


    }

    public class Manufacturer
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public Picture Picture { get; set; }

        public int PictureId { get; set; }
    }

    public class Review
    {
        public int Id { get; set; }

        public int UserId { get; set; }

        public User User { get; set; }

        public float Rating { get; set; }

        public DateTime CreateDate { get; set; }

        public int ProductId { get; set; }

        public Product Product { get; set; }
    }

    public class User
    {
        public int Id { get; set; }

        public string Name { get; set; }
    }

    public class RelatedProduct
    {
        public int Id { get; set; }

        public int MainProductId { get; set; }

        public Product MainProduct { get; set; }

        public int ProductId { get; set; }

        public Product Product { get; set; }
    }

    public class Discount
    {
        public int Id { get; set; }

        public int MainProductId { get; set; }

        public Product MainProduct { get; set; }

        public int ProductId { get; set; }

        public Product Product { get; set; }

        public float Value { get; set; }
    }
    
    public class Field
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public int CategoryId { get; set; }

        public Category Category { get; set; }

        public string Type { get; set; }
    }
    
    public class FieldValue
    {
        public int Id { get; set; }

        public int FieldId { get; set; }

        public Field Field { get; set; }

        public int ProductId { get; set; }

        public Product Product { get; set; }

        public int? IntegerValue { get; set; }

        public string StringValue { get; set; }
    }