I am using EF4 (Db First) and I have an entity with a number of non-nullable properties.
In an Edit form (Razor/MVC3), I want to allow the editing of only one of the properties, but not the others.
To get this to work, I am having to put #Html.HiddenFor(...) statements for each of my other properties that can't be nullable, otherwise I get an error on SaveChanges().
Is there a simple way to just have the ID hidden on the view, the property that can be edited, and then update ONLY that property?
All you need to do in this case is to include the ID of the entity you are editing as a hidden field as well as a text field for the property that you actually wanna edit:
#using (Html.BeginForm())
{
#Html.HiddenFor(x => x.ID)
#Html.EditorFor(x => x.PropertyYouWannaEdit)
<button type="submit">Update</button>
}
and then in the corresponding controller action you could retrieve the entity that needs to be edited from your database, update the value of the property that needs editing and save back the changes.
[HttpPost]
public ActionResult Update(SomeEntity model)
{
SomeEntity entityToEdit = db.GetEntity(model.ID);
entityToEdit.PropertyYouWannaEdit = model.PropertyYouWannaEdit;
db.Update(entityToEdit);
return RedirectToAction("Success");
}
But personally I would use a view model and AutoMapper to handle this situation. So I would start by designing a view model representing the requirements of my view and including the properties that needs to be edited only:
public class MyEntityViewModel
{
public int ID { get; set; }
public string Property1ToBeEdited { get; set; }
public string Property2ToBeEdited { get; set; }
...
}
and then have the corresponding view:
#model MyEntityViewModel
#using (Html.BeginForm())
{
#Html.HiddenFor(x => x.ID)
#Html.EditorFor(x => x.Property1ToBeEdited)
#Html.EditorFor(x => x.Property2ToBeEdited)
...
<button type="submit">Update</button>
}
and finally the 2 controller actions (GET and POST):
public ActionResult Update(int id)
{
// Fetch the domain model that we want to be edited from db
SomeEntity domainModel = db.GetEntity(id);
// map the domain model to a view model
MyEntityViewModel viewModel = Mapper.Map<SomeEntity, MyEntityViewModel>(domainModel);
// pass the view model to the view
return View(viewModel);
}
[HttpPost]
public ActionResult Update(MyEntityViewModel model)
{
if (!ModelState.IsValid)
{
// validation failed => redisplay view so that the user can fix the errors
return View(model);
}
// fetch the domain entity that needs to be edited:
SomeEntity entityToEdit = db.GetEntity(model.ID);
// update only the properties that were part of the view model,
// leaving the others intact
Mapper.Map<MyEntityViewModel, SomeEntity>(model, entityToEdit);
// persist the domain model
db.Update(entityToEdit);
// we are done
return RedirectToAction("Success");
}
Ok, I have read a bunch of articles, and I am still lost, so I figure I will put the question out here.
I am trying to create a dynamic dropdown in my "posts" create view. I would like to pull the selectList items from my Categories.sdf, which has a table called categories and two columns, "CategoryID" and "CategoryTitle".
I know I need to pull the items into the viewbag within by "postscontroller" so they can be passed to the view. But I am not sure what this would look like. Again, i'm new to MVC so if i sound like a dope, i apologize.
I know I need to pull the items into the viewbag within by "postscontroller"
Oh no, you don't need to do anything like that.
You could start by defining a view model:
public class PostViewModel
{
[DisplayName("Select a category")]
[Required]
public string SelectedCategoryId { get; set; }
public IEnumerable<SelectListItem> Categories { get; set; }
}
that you will populate in your controller:
public class PostsController: Controller
{
public ActionResult Index()
{
var model = new PostViewModel();
model.Categories = db.Categories.ToList().Select(c => new SelectListItem
{
Value = c.CategoryId,
Text = c.CategoryName
});
return View(model);
}
}
and then have a corresponding strongly typed view (~/views/posts/index.cshtml):
#model PostViewModel
#using (Html.BeginForm())
{
#Html.LabelFor(x => x.SelectedCategoryId)
#Html.DropDownListFor(x => x.SelectedCategoryId, Model.Categories, "-- select --")
#Html.ValidationMessageFor(x => x.SelectedCategoryId)
<button type="submit">OK</button>
}
I am doing the ASP.net MVC 3 (Empty type and not the internet type) with the Database First approach...
What i need is
Step 1:
I just used the dropdown to display the various locations where the company is located. The list comes from the Organization table and Location is only one string field in this Oranization Table,
Step 2:
While the user is doing registration, the dropdown list will show the locations.. Now, user selects India, then this value (Location Name) should store in the UserLogin Table...
Now how to read the value from the dropdown and i hope you understand my question and thanks in advance
I would use view models:
public class RegisterViewModel
{
public string LocationName { get; set; }
public IEnumerable<SelectListItem> Locations { get; set; }
}
then a controller action that will serve the view:
public ActionResult Index()
{
var model = new RegisterViewModel();
model.Locations = new SelectList(dbcontext.Organization_Details, "OName", "OLocation");
return View(model);
}
then the corresponding strongly typed view:
#model RegisterViewModel
#using (Html.BeginForm())
{
#Html.LabelFor(x => x.LocationName)
#Html.DropDownListFor(x => x.LocationName, Model.Locations)
<button type="submit">OK</button>
}
and finally the controller action that will be invoked when the form is submitted:
[HttpPost]
public ActionResult Index(RegisterViewModel model)
{
// model.LocationName will contain the selected location here
...
}
I have a model which contains a list of another model.
Let's say I have a MovieModel:
public class MovieModel
{
public int MovieId { get; set; }
public string Title { get; set; }
public string Director { get; set; }
}
Then I have the RentalModel:
public class RentalModel
{
public int RentalId { get; set; }
public string CustomerId { get; set; }
public List<MovieModel> Movies { get; set; }
}
Then I have a place where all the rentals are displayed, which by clicking on the rental, its details will be displayed, from the "ShowRentals.aspx" to "ShowRentalDetails.aspx"
<% using (Html.BeginForm()) { %>
<% foreach(var rent in Model) { %>
<div class="editor-label">
<div class="editor-field">
<%: rent.RentalId %>
<%: Html.ActionLink("Details", "ShowRentalDetails",
new {rentalId = rent.RentalId,
customerId = rent.CustomerId,
movies = rent.Movies,
})%>
When I debug, I see that the Movies list is always null. This is because only primitive parameters are passed successfully, such as the Ids. I was never able to pass complex types. I really need this list to be passed on to the controller. Is it maybe because the actionlink is not capable? What other work-arounds can I do? I've been stuck on this for a while.
Nevermind the bare code here, this is just to show you what I'm doing with the list. Please help.
(follow up)
In the Controller, here's the two actions, ShowRentals and ShowRentalDetails:
public ActionResult ShowRentals()
{
MembershipUser user = Membership.GetUser(User.Identity.Name, true);
Guid guid = (Guid)user.ProviderUserKey;
Entities dataContext = new Entities();
Member member = dataContext.Members.Where(m => m.UserID == guid).First();
IEnumerable<RentalModel> toReturn = from r in member.Rentals
select new RentalModel
{
RentalId = m.RentalID,
CustomerId = m.CustomerID,
};
return View(toReturn);
}
[Authorize]
public ActionResult ShowRentalDetails(RentalModel model, List<MovieModel> movies)
{
return View("ShowRentalDetails", model);
}
I can't set it in ShowRentals because the array of movies in the database is of Movie type and not MovieModel, so the two lists are not compatible. It is null in the model when passed from ShowRentals view and the model is reconstructed by mvc, and it also doesn't work when explicitly passed from the actionlink as a parameter. help!
I believe Html.ActionLink performs a GET and you can't pass complex data types using a GET.
If you could refetch the movie list in your ShowRentDetails controller by using the rental id I think that would be best.
Otherwise, you could look up EditorFor templates. If you make an editorfor template for MovieModel and post a RentalModel to ShowRentDetails then you could get the MovieModel list that way.
See http://weblogs.asp.net/shijuvarghese/archive/2010/03/06/persisting-model-state-in-asp-net-mvc-using-html-serialize.aspx for another way.
On a side note, theres no need to make
List<MovieModel> movies
a second parameter in ShowRentDetails when it's already included in the model
Source: ASP.NET MVC - Trouble passing model in Html.ActionLink routeValues
It is clear you cant pass complex view models through action link. There is a possibility to pass simple objects which does not have any complex properties. There is another way you can do as multiple submit buttons and do a post to controller. Through the submit you have possibilities to post complex view models
I have 2 models:
public class Person
{
public int PersonID { get; set; }
public string PersonName { get; set; }
}
public class Order
{
public int OrderID { get; set; }
public int TotalSum { get; set; }
}
I want edit objects of BOTH classes in SINGLE view, so I need something like:
#model _try2models.Models.Person
#model _try2models.Models.Order
#using(Html.BeginForm())
{
#Html.EditorFor(x => x.PersonID)
#Html.EditorFor(x => x.PersonName)
#Html.EditorFor(x=>x.OrderID)
#Html.EditorFor(x => x.TotalSum)
}
This, of course, don't work: Only one 'model' statement is allowed in a .cshtml file. May be there is some workaround?
Create a parent view model that contains both models.
public class MainPageModel{
public Model1 Model1{get; set;}
public Model2 Model2{get; set;}
}
This way you can add additional models at a later date with very minimum effort.
To use the tuple you need to do the following, in the view change the model to:
#model Tuple<Person,Order>
to use #html methods you need to do the following i.e:
#Html.DisplayNameFor(tuple => tuple.Item1.PersonId)
or
#Html.ActionLink("Edit", "Edit", new { id=Model.Item1.Id }) |
Item1 indicates the first parameter passed to the Tuple method and you can use Item2 to access the second model and so on.
in your controller you need to create a variable of type Tuple and then pass it to the view:
public ActionResult Details(int id = 0)
{
Person person = db.Persons.Find(id);
if (person == null)
{
return HttpNotFound();
}
var tuple = new Tuple<Person, Order>(person,new Order());
return View(tuple);
}
Another example : Multiple models in a view
Another option which doesn't have the need to create a custom Model is to use a Tuple<>.
#model Tuple<Person,Order>
It's not as clean as creating a new class which contains both, as per Andi's answer, but it is viable.
If you are a fan of having very flat models, just to support the view, you should create a model specific to this particular view...
public class EditViewModel
public int PersonID { get; set; }
public string PersonName { get; set; }
public int OrderID { get; set; }
public int TotalSum { get; set; }
}
Many people use AutoMapper to map from their domain objects to their flat views.
The idea of the view model is that it just supports the view - nothing else. You have one per view to ensure that it only contains what is required for that view - not loads of properties that you want for other views.
ok, everyone is making sense and I took all the pieces and put them here to help newbies like myself that need beginning to end explanation.
You make your big class that holds 2 classes, as per #Andrew's answer.
public class teamBoards{
public Boards Boards{get; set;}
public Team Team{get; set;}
}
Then in your controller you fill the 2 models. Sometimes you only need to fill one. Then in the return, you reference the big model and it will take the 2 inside with it to the View.
TeamBoards teamBoards = new TeamBoards();
teamBoards.Boards = (from b in db.Boards
where b.TeamId == id
select b).ToList();
teamBoards.Team = (from t in db.Teams
where t.TeamId == id
select t).FirstOrDefault();
return View(teamBoards);
At the top of the View
#model yourNamespace.Models.teamBoards
Then load your inputs or displays referencing the big Models contents:
#Html.EditorFor(m => Model.Board.yourField)
#Html.ValidationMessageFor(m => Model.Board.yourField, "", new { #class = "text-danger-yellow" })
#Html.EditorFor(m => Model.Team.yourField)
#Html.ValidationMessageFor(m => Model.Team.yourField, "", new { #class = "text-danger-yellow" })
And. . . .back at the ranch, when the Post comes in, reference the Big Class:
public ActionResult ContactNewspaper(teamBoards teamboards)
and make use of what the model(s) returned:
string yourVariable = teamboards.Team.yourField;
Probably have some DataAnnotation Validation stuff in the class and probably put if(ModelState.IsValid) at the top of the save/edit block. . .
In fact there is a way to use two or more models on one view without wrapping them in a class that contains both.
Using Employee as an example model:
#model Employee
Is actually treated like.
#{ var Model = ViewBag.model as Employee; }
So the View(employee) method is setting your model to the ViewBag and then the ViewEngine is casting it.
This means that,
ViewBag.departments = GetListOfDepartments();
return View(employee);
Can be used like,
#model Employee
#{
var DepartmentModel = ViewBag.departments as List<Department>;
}
Essentially, you can use whatever is in your ViewBag as a "Model" because that's how it works anyway. I'm not saying that this is architecturally ideal, but it is possible.
Just create a single view Model with all the needed information in it, normaly what I do is create a model for every view so I can be specific on every view, either that or make a parent model and inherit it. OR make a model which includes both the views.
Personally I would just add them into one model but thats the way I do it:
public class xViewModel
{
public int PersonID { get; set; }
public string PersonName { get; set; }
public int OrderID { get; set; }
public int TotalSum { get; set; }
}
#model project.Models.Home.xViewModel
#using(Html.BeginForm())
{
#Html.EditorFor(x => x.PersonID)
#Html.EditorFor(x => x.PersonName)
#Html.EditorFor(x => x.OrderID)
#Html.EditorFor(x => x.TotalSum)
}
You can use the presentation pattern http://martinfowler.com/eaaDev/PresentationModel.html
This presentation "View" model can contain both Person and Order, this new
class can be the model your view references.
Another way that is never talked about is
Create a view in MSSQL with all the data you want to present. Then use LINQ to SQL or whatever to map it. In your controller return it to the view. Done.
you can't declare two model on one view, try to use Html.Action("Person", "[YourController]") & Html.Action("Order", "[YourController]").
Good luck.
Beside of one view model in asp.net you can also make multiple partial views and assign different model view to every view, for example:
#{
Layout = null;
}
#model Person;
<input type="text" asp-for="PersonID" />
<input type="text" asp-for="PersonName" />
then another partial view Model for order model
#{
Layout = null;
}
#model Order;
<input type="text" asp-for="OrderID" />
<input type="text" asp-for="TotalSum" />
then in your main view load both partial view by
<partial name="PersonPartialView" />
<partial name="OrderPartialView" />
I hope you find it helpfull !!
i use ViewBag For Project and Model for task so in this way i am using two model in single view and in controller i defined viewbag's value or data
List<tblproject> Plist = new List<tblproject>();
Plist = ps.getmanagerproject(c, id);
ViewBag.projectList = Plist.Select(x => new SelectListItem
{
Value = x.ProjectId.ToString(),
Text = x.Title
});
and in view tbltask and projectlist are my two diff models
#{
IEnumerable<SelectListItem> plist = ViewBag.projectList;
}
#model List