My Model Is :
public class Product
{
public int id { get; set; }
public string Name { get; set; }
public string Color { get; set; }
public ICollection<Tag> Tags { get; set; }
}
public class Tag
{
public int id { get; set; }
public string Name { get; set; }
public int ProductId { get; set; }
[ForeignKey("ProductId")]
public virtual Product Product { get; set; }
}
And View Model Is :
public class ProductViewModel
{
public int id { get; set; }
public string Name { get; set; }
public string Color { get; set; }
public List<string> Tags { get; set; }
}
im using ExpressMapper To Mapping.
could it be map productviewModel List Tags To public ICollection Tags?
You can register your mappings like that:
Mapper.RegisterCustom<Tag, string>((tag) => tag.Name);
Mapper.Register<Product, ProductViewModel>();
Mapper.Compile();
Here is working example: https://dotnetfiddle.net/2r7l4z
Related
Here are Entities:
public class Entity
{
public int Id { get; set; }
public DateTime CreatedOn { get; set; }
public DateTime? ModifiedOn { get; set; }
}
public class EntityBase : Entity
{
[ForeignKey("CreatedBy")]
public int CreatedById { get; set; }
public User CreatedBy { get; set; }
[ForeignKey("ModifiedBy")]
public int? ModifiedById { get; set; }
public User ModifiedBy { get; set; }
}
public class ProjectRequest : EntityBase
{
public string RequestTitle { get; set; }
public string RequestType { get; set; }
...
public virtual ICollection<Material> Materials { get; set; }
public virtual ICollection<Translation> Translations { get; set; }
}
public class Material : EntityBase
{
[ForeignKey("ProjectRequest")]
public int ProjectRequestId { get; set; }
public virtual ProjectRequest ProjectRequest { get; set; }
...
public virtual ICollection<Translation> Translations { get; set; }
}
public class Translation:EntityBase
{
[ForeignKey("ProjectRequest")]
public int ProjectRequestId { get; set; }
public virtual ProjectRequest ProjectRequest { get; set; }
[ForeignKey("Material")]
public int MaterialId { get; set; }
public virtual Material Material { get; set; }
public string ProductMasterText { get; set; }
[MaxLength(40)]
public string ShortDescription { get; set; }
public string MasterDescriptionLine1 { get; set; }
public string MasterDescriptionLine2 { get; set; }
public string MasterDescriptionLine3 { get; set; }
public string LanguageCode { get; set; }
}
No modifications has been done to these entities using fluent API.
Now, whenever I try to insert object of type ProjectRequest with Materials and Translations nested in it, in Translation objects ProjectRequestId is set to 0.
Following is sample Change Tracker snapshot:
Can anyone help me on this? Why ProjectRequestId is 0 but MaterialId properly assigned in Transaltion objects?
I have a many-to-many relationship between Recipe and Item via a join table called Ingredient:
public class Recipe
{
public int RecipeId { get; set; }
public string Name { get; set; }
public ICollection<RecipeInstruction> RecipeInstructions { get; set; }
public ICollection<Ingredient> Ingredients { get; set; }
}
public class Ingredient
{
public Recipe Recipe { get; set; }
public int RecipeId { get; set; }
public Item Item { get; set; }
public int ItemId { get; set; }
public int Quantity { get; set; }
}
public class Item
{
public int ItemId { get; set; }
public string Name { get; set; }
public string Brand { get; set; }
public ICollection<Ingredient> Ingredients { get; set; }
}
I would like to present the data through this DTO:
public class RecipeForDetailedDto
{
public int RecipeId { get; set; }
public string Name { get; set; }
public ICollection<RecipeInstruction> RecipeInstructions { get; set; }
public ICollection<ItemForDetailedDto> Ingredients { get; set; }
}
Is there a way I can map this relationship to show a list of Ingredient names, which would be the Item Name?
It should look like this:
CreateMap<Ingredient, ItemForDetailedDto>();
CreateMap<Ingredient,RecipeForDetailedDto>()
.ForMember(dest=>dest.Name, opt=>opt.MapFrom(src=>src.Item?.Name));
var result = mapper.Map<ItemDetailedDto>(yourIngredientObject);
In the end this is what worked:
CreateMap<Ingredient, IngredientForDetailedDto>()
.ForMember(dest => dest.Name, opt => opt.MapFrom(src => src.Item.Name))
With IngredientForDetailedDto as:
public class IngredientForDetailedDto
{
public string Name { get; set; }
public int Quantity { get; set; }
public string QuantityType { get; set; }
}
I have two models using Entity Framework.
public class Player
{
public int PlayerId { get; set; }
public string Name { get; set; }
public string Sex { get; set; }
public string Plays { get; set; }
public string FavouriteSurface { get; set; }
}
public class SinglesMatch
{
public int SinglesMatchId { get; set; }
public int Player1Id { get; set; }
public int Player2Id { get; set; }
public int PlayerIdWinner { get; set; }
public DateTime Date { get; set; }
public string Venue { get; set; }
public string Score { get; set; }
public List<Player> Players { get; set; }
}
I am using the below code to attempt to display the Name of the player, based on the PlayerId in the SinglesMatch model matching the PlayerID from the Player model.
#foreach (var item in #Model)
{
<ul id="Players" class="bg-success"></ul>
<br/>
<h3>Date - #Html.DisplayFor(#modelItem => item.Date)</h3>
<li>Venue - #Html.DisplayFor(#modelItem => item.Venue)</li>
<li>Player 1 - #Html.DisplayFor(#modelItem => item.Players.First(p => p.PlayerId == item.Player1Id).Name)</li>
<li>Player 2 - #Html.DisplayFor(#modelItem => item.Players.First(p => p.PlayerId == item.Player2Id).Name)</li>
<li>Score- #Html.DisplayFor(#modelItem => item.Score)</li>
}
Upon debugging, the navigation property is always showing as null when the model is retrieved from my repository.
Am I using the navigation property in the correct fashion ? is there a problem with my query ?
Edit to include DbContext:
public TennisTrackerContext() : base("name=TennisTrackerContext")
{
}
public DbSet<Player> Players { get; set; }
public DbSet<PlayerRecord> PlayerRecords { get; set; }
public DbSet<SinglesMatch> SinglesMatches { get; set; }
public DbSet<DoublesMatch> DoublesMatches { get; set; }
public DbSet<Venue> Venues { get; set; }
}
}
You need to add a bridge table. Sql will create this automatically but you won't have access to the variables unless you create it in c#.
public class Player
{
public int PlayerId { get; set; }
public string Name { get; set; }
public string Sex { get; set; }
public string Plays { get; set; }
public string FavouriteSurface { get; set; }
List<PlayerInMatch> Matches { get; set; }
public Player()
{
Matches = new List<PlayerInMatch>();
}
}
public class PlayerInMatch
{
public int Id { get; set; }
public int PlayerId { get; set; }
[ForeignKey("PlayerId")]
public Player Player { get; set; }
public int SinglesMatchId { get; set; }
[ForeignKey("SinglesMatchId")]
public SinglesMatch SinglesMatch { get; set; }
}
public class SinglesMatch
{
public int SinglesMatchId { get; set; }
public int PlayerIdWinner { get; set; }
public DateTime Date { get; set; }
public string Venue { get; set; }
public string Score { get; set; }
public List<PlayerInMatch> Players { get; set; }
public SinglesMatch()
{
Players = new List<PlayerInMatch>();
}
}
static void Main(string[] args)
{
var match = new SinglesMatch();
match.Players.Select(c => c.Player.Name);
}
You need to make your navigation property virtual to enable lazy/eager loading:
public class SinglesMatch
{
public int SinglesMatchId { get; set; }
public int Player1Id { get; set; }
public int Player2Id { get; set; }
public int PlayerIdWinner { get; set; }
public DateTime Date { get; set; }
public string Venue { get; set; }
public string Score { get; set; }
public virtual List<Player> Players { get; set; }
}
Also, did you define the relationship between SinglesMatch and Singles in fluent api?
EDIT: I see you don't have any relations mapped through annotations or fluent api whatsoever, I suggest you take a look at this:
https://msdn.microsoft.com/en-us/data/jj591617.aspx
I have a many to one relationship between Categories and News.
The problem I'm having is that EF keeps adding a foreign key colum to my table which I dont want!
News class
public class News
{
public News()
{
}
[Key]
public int NewsID { get; set; }
public int PublishedByID { get; set; }
public string PublishedByFullName { get; set; }
public string PublishedByEmail { get; set; }
public DateTime DatePublished { get; set; }
public string Title { get; set; }
public string PreviewText { get; set; }
public string BlobName { get; set; }
public virtual Category Category { get; set; }
}
Categories class
public class Category
{
public Category()
{
News = new HashSet<News>();
}
[Key]
public int CategoryID { get; set; }
public string Name { get; set; }
public string CategoryTypeName { get; set; }
public virtual ICollection<News> News { get; set; }
}
Database
My question
How do I remove Category_CategoryID in News table?
I'm guessing i'm missing some code in my OnModelCreating method.
You need to add id field in News class to reference Category.
public class News
{
[Key]
public int NewsID { get; set; }
public int CategoryID { get; set; } // added
public int PublishedByID { get; set; }
public string PublishedByFullName { get; set; }
public string PublishedByEmail { get; set; }
public DateTime DatePublished { get; set; }
public string Title { get; set; }
public string PreviewText { get; set; }
public string BlobName { get; set; }
public virtual Category Category { get; set; }
}
hello I want to get the properties of the class as a dynamic
thank you
var result = GetAttributes("Student");
public class Student
{
public int StudentID { get; set; }
public string StudenName { get; set; }
public string StudenSurName{ get; set; }
public bool Active { get; set; }
List<Teacher> TeacherList { get; set; }
}
public class Teacher
{
public int TeacherID { get; set; }
public string TeacherName{ get; set; }
}