Develop Reference

How to insert data on tables created with UsingEntity - EF - c#

I have this models
public class Food
{
public int FoodId { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string Ingredients { get; set; }
public string PhotoPath { get; set; }
public ICollection<Menu> Menus { get; set; }
}
public class Menu
{
public int MenuId { get; set; }
[Column(TypeName = "date")]
public DateTime MenuDate { get; set; }
public bool IsPublished { get; set; }
public ICollection<Food> Foods { get; set; }
}
and added this in model builder
modelBuilder.Entity<Food>()
.HasMany(left => left.Menus)
.WithMany(right => right.Foods)
.UsingEntity(join => join.ToTable("menu_foods"));
this will create a table menu_foods that has food_id and menu_id
My question is, how can I insert the data for that table to link my menu to food?
current code that I have to insert:
var food = dbContext.Foods.First();
var menu = new Menu {
... // any data I set
}
menu.Foods.Add(food);
The code above throws PK error as it tries to insert new instance of food instead. My goal here is to create data on the linking table instead.

Related

I'm building a feature with a jquery datatable, the idea is to have a list of stores in the parent row, and then when expanding the parent to list all the licensed terminals in child rows that are linked to the store parent row by a StoreLicenseId column. The issue I am having is that I have a ViewModel with two models, one for the list of stores and one for the licensed terminals. I'm busy building the method into my controller, my problem is in the second part of the method where I new up "StoreLicenseDetails = sl.Select(tl => new TerminalListViewModel()", all the references to tl.terminalId and tl.Terminalname. I get this error "StoreListViewModel does not contain a definition for TerminalID and no accessible extension method". I can see why this is happening, so my question really is, how do I include this "second" TerminalListViewModel into my method to form part of the query ?
ViewModel
public partial class StoreListViewModel
{
public List<TerminalListViewModel> StoreLicenseDetails { get; set; } = null!;
public int Id { get; set; }
public Guid StoreLicenseId { get; set; }
[DisplayName("Store Name")]
public string StoreName { get; set; } = null!;
[DisplayName("App One Licenses")]
public int QtyAppOneLicenses { get; set; }
[DisplayName("App Two Licenses")]
public int QtyAppTwoLicenses { get; set; }
[DisplayName("Date Licensed")]
public DateTime DateLicensed { get; set; }
[DisplayName("Licensed Days")]
public int LicenseDays { get; set; }
[DisplayName("Is License Active")]
public bool LicenseIsActive { get; set; }
}
public partial class TerminalListViewModel
{
public int Id { get; set; }
public Guid StoreLicenseId { get; set; }
public Guid TerminalId { get; set; }
public string TerminalName { get; set; } = null!;
public string LicenseType { get; set; } = null!;
public int TerminalLicenseDays { get; set; }
public DateTime DateLicensed { get; set; }
public bool LicenseIsActive { get; set; }
public bool IsDecommissioned { get; set; }
public DateTime LastLicenseCheck { get; set; }
}
Controller Method
//sl = StoreList
//tl = TerminalList
public IEnumerable<StoreListViewModel> GetStoreList()
{
return GetStoreList().GroupBy(sl => new { sl.StoreLicenseId, sl.StoreName, sl.QtyAppOneLicenses,
sl.QtyAppTwoLicenses, sl.DateLicensed, sl.LicenseDays,
sl.LicenseIsActive })
.Select(sl => new StoreListViewModel()
{
StoreName = sl.Key.StoreName,
QtyAppOneLicenses = sl.Key.QtyAppOneLicenses,
QtyAppTwoLicenses = sl.Key.QtyAppTwoLicenses,
DateLicensed = sl.Key.DateLicensed,
LicenseDays = sl.Key.LicenseDays,
LicenseIsActive = sl.Key.LicenseIsActive,
StoreLicenseId = sl.FirstOrDefault().StoreLicenseId,
StoreLicenseDetails = sl.Select(tl => new TerminalListViewModel()
{
StoreLicenseId = tl.StoreLicenseId,
TerminalId = tl.TerminalId,
TerminalName = tl.TerminalName,
}).ToList()
}).ToList();
}

Based on the error,I suppose your GetStoreList() method returns List<OrderListViewModel> ,but your OrderListViewModel doesn't contains properties of TerminalListViewModel,So you got the error
GetStoreList() method should return List<SourceModel>( Source is the model which contains all the properties of StoreListViewModel and TerminalListViewModel)
For example,the link your provided:Multiple child rows in datatable, data from sql server in asp.net core
public class OrderList
{
//source of properties of OrderListViewModel(parent rows)
public int OrderId { get; set; }
public string Customer { get; set; }
public string OrderDate { get; set; }
//source of properties of OrderListDetailViewModel(child rows)
public int KimlikId { get; set; }
public string Product { get; set; }
public string Color { get; set; }
public int Qntty { get; set; }
}
public class OrderListViewModel
{
public int OrderId { get; set; }
public string Customer { get; set; }
public string OrderDate { get; set; }
public List<OrderListDetailViewModel> OrderListDetails { get; set; }
}
public class OrderListDetailViewModel
{
public int KimlikId { get; set; }
public string Product { get; set; }
public string Color { get; set; }
public int Qntty { get; set; }
}
Orderlist contains all columns OrderListViewModel and OrderListDetailViewModel needs.
When it comes to your case,you should
create 3 models (source,parentrow,childrows)
model for parentrows contains the properties
StoreLicenseId,StoreName, QtyAppOneLicenses,QtyAppTwoLicenses, DateLicensed, LicenseDays,LicenseIsActive
and model for childrows contains the other properties of source model
If you still have questions,please show the data you pulled form db,and I'll write a demo for you

My parent class is
public class Restaurant
{
public int RestaurantId { get; set; }
public string RestaurantName { get; set; }
public string Location { get; set; }
public string Type { get; set; }
public virtual List<Food> Foods { get; set; }
}
My child class
public class Food
{
public int FoodId { get; set; }
public string FoodName { get; set; }
public string FoodType { get; set; }
public int RestaurantId { get; set; }
public virtual Restaurant Restaurant { get; set; }
}
I want to save a food item with a restaurant.
This is my create controller
var restaurants = db.Restaurants.ToList();
ViewBag.restaurant =
restaurants.Select(x => new SelectListItem() { Value = x.RestaurantId.ToString(), Text = x.RestaurantName });
if (ModelState.IsValid)
{
db.Foods.Add(food);
db.SaveChanges();
return RedirectToAction("Index");
}
But in the display list it only shows the restaurantID.
I want to show corresponding restaurentName for each RestaurantId from the Restaurant table.
How can I do this ?

I believe you need to change your field name in the view from restaurantID to Restaurant.RestaurantName

I have two models:
public class Project
{
public int ProjectID { get; set; }
public string Name { get; set; }
public string ShortDesc { get; set; }
public string LongDesc { get; set; }
public int Status { get; set; }
public DateTime StartDate { get; set; }
public DateTime EndDate { get; set; }
public string Image { get; set; }
public List<Note> Notes { get; }
}
and:
public class Note
{
public int NoteID { get; set; }
public int ProjectID { get; set; }
public string Name { get; set; }
public string Content { get; set; }
public int Status { get; set; }
public DateTime Timestamp { get; set; }
public string Tags { get; set; }
}
My goal is to be able to easily relate Note and Project objects in view.
To store ProjectID in Note object I do:
// GET: Notes/Create
public ActionResult Create() {
ViewBag.Projects = db.Projects.ToList();
return View();
}
And later in Create view:
#Html.DropDownListFor(model => model.ProjectID, new SelectList(ViewBag.Projects, "ProjectID", "Name"))
Which allows me to pick related project by it's name.
How to correctly swap ProjectID with Project.Name on Index page (where all my notes are shown)?
Also I would like to see related Notes column in Project Index (where all my Projects are listed). Is it possible with use of Notes List from ProjectModel?

You can add a Project property to your Note class.
public class Note
{
public int NoteID { get; set; }
public int ProjectID { get; set; }
public string Name { get; set; }
public string Content { get; set; }
public int Status { get; set; }
public DateTime Timestamp { get; set; }
public string Tags { get; set; }
public virtual Project Project {set;get;}
}
And now you can access this project property in your view
#model List<Note>
#foreach(var item in Model)
{
<p>#item.Name</p>
<p>#item.Project.Name</p>
}

Hi every one I want to save complex data using Entity Framework and C#. I have 2 classes Product and Order defined as follows
Product Class
public class Product
{
[Key]
public int Id { get; set; }
public string SKU_Code { get; set; }
public string Product_Name { get; set; }
public string Quantity { get; set; }
public string Price { get; set; }
public string Image { get; set; }
public DateTime Created_Date { get; set; }
public DateTime Modified_Date { get; set; }
}
Order Class
public class Order
{
[Key]
public long ID { get; set; }
public string Order_Id { get; set; }
public string Payment_Type { get; set; }
public string Customer_Name { get; set; }
public string Shipping_Address { get; set; }
public DateTime Order_Date { get; set; }
public DateTime Modified_Date { get; set; }
public bool Flag { get; set; }
public List<Product> ProductDetails { get; set; }
}
And I want to save data Order details and my piece of code is as follows.
public Order Add(Order odrerDetails)
{
using (var context = new EcommerceDBContext())
{
var MyOrder_Id = Helper.Random(7); //Generate random orderID from my class
foreach (var detail in odrerDetails.ProductDetails)
{
odrerDetails.Order_Id = MyOrder_Id;
odrerDetails.Quantity = Convert.ToInt32(detail.Quantity);
odrerDetails.Amount = Convert.ToDouble(detail.Price);
//Other Details
context.objOrderListing.Add(odrerDetails);
}
context.SaveChanges();
return odrerDetails;
}
}
This gives me perfect data but when it comes to context.SaveChanges(); it return's me error.
An error occurred while saving entities that do not expose foreign key properties for their relationships. The EntityEntries property will return null because a single entity cannot be identified as the source of the exception. Handling of exceptions while saving can be made easier by exposing foreign key properties in your entity types.

To me you domain model seems all wrong. The order should just be used for grouping, its a typical e-commerce scenario.
When you get a receipt of your purchases, you get one receipt with every Item and price listed next to it. Its considered as one order of multiple things, not multiple orders of multiple things.
Reading your last comment, you cant have multiple orders with the same order id. Try to understand the domain first before trying to solve it with code. Also,you have no notion of a Customer with an Order.
public class Product
{
[Key]
public int Id { get; set; }
public string SKU_Code { get; set; }
public string Product_Name { get; set; }
public string Price { get; set; }
public string Image { get; set; }
public DateTime Created_Date { get; set; }
public DateTime Modified_Date { get; set; }
}
public class Order
{
[Key]
public long ID { get; set; }
public string Order_Id { get; set; }
public string Payment_Type { get; set; }
public string Customer_Name { get; set; }
public string Shipping_Address { get; set; }
public DateTime Order_Date { get; set; }
public DateTime Modified_Date { get; set; }
public bool Flag { get; set; }
public List<OrderLineItem> Items { get; set; }
}
public class OrderLineItem
{
[Key]
public long ID { get; set; }
public long Order_Id { get; set; }
public long Product_Id {get; set;}
public int Quantity {get; set;}
}

I'm using asp.net mvc 3 and EF 4.1 with visual studio 2010 and im new to it.
i have a problem about last inserted id. i have two table in my db "points_Order" and "points_OrderDetails".
db.Order.Add(po);
db.SaveChanges();
//second thing i have tried
var orderID = (from oi in db.Order
select oi.ID)
.Max(i => i);
// and this first thing
pod.OrderID = po.ID;
pod.OrderID = orderID;
db.OrderDetails.Add(pod);
db.SaveChanges();
context class:
public class points_Order {
[Key]
public int ID { get; set; }
public string Owner { get; set; }
public DateTime Date { get; set; }
public byte Status { get; set; }
public int Total { get; set; }
//public virtual points_OrderDetails OrderDetail { get; set; }
}
public class points_OrderDetails {
[Key]
public int OrderID { get; set; }
public string OrderType { get; set; }
public int Amount { get; set; }
public int ItemID { get; set; }
public int ItemRecord { get; set; }
public string ItemCode { get; set; }
public byte Plus { get; set; }
public byte Degree { get; set; }
public string Kind { get; set; }
public string Sex { get; set; }
public string Race { get; set; }
public string Tier { get; set; }
public string SetItem { get; set; }
public string SOX { get; set; }
//public Blues Blue { get; set; }
}
public DbSet<points_Order> Order { get; set; }
public DbSet<points_OrderDetails> OrderDetails { get; set; }
im getting the error "{"Cannot insert the value NULL into column 'OrderID', table 'db.dbo.points_OrderDetails'; column does not allow nulls. INSERT fails.\r\nThe statement has been terminated."}"
what can i do? am i doing something wrong?

If you define a relationship from order -> order details in your model, it should work like this:
po.Details.Add(pod); // or pod.Order = po;
db.Order.Add(po);
db.SaveChanges();
EF should figure out the relations for you, no need to set ID's manually.
UPDATE: you're trying to do something that is not supported. You have a one-to-one mapping; EF does not support it the way you intend to (shared primary key). See http://weblogs.asp.net/manavi/archive/2011/05/01/associations-in-ef-4-1-code-first-part-5-one-to-one-foreign-key-associations.aspx for an explanation on how to model one-to-one in EF.