In MVC4 there is a need to list a group of clients. I achieved this by creating 2 model ClientList and Client model. I made ClientList class as serializable. Now there is a need to apply filter condition for this model with various parameters. How to achieve this ? Here is my model.
public class Client : Paging
{
public virtual string CompanyName { get; set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
}
[Serializable]
public class ClientList : Paging
{
private Client _client;
public Client Client
{
get { return _client; }
set { _client = value; }
}
}
In Data Access, am using this
while (reader.Read())
{
var rCompanyName = reader.GetOrdinal("CompanyName");
var rFirstName = reader.GetOrdinal("FirstName");
var rLastName = reader.GetOrdinal("LastName");
var resultClientList = new Client
{
CompanyName = Convert.IsDBNull(rCompanyName) ? string.Empty : reader.GetString(rCompanyName),
FirstName = Convert.IsDBNull(rFirstName) ? string.Empty : reader.GetString(rFirstName),
LastName = Convert.IsDBNull(rLastName) ? string.Empty : reader.GetString(rLastName)
};
var clients = new ClientList();
admin.Client = resultClientList;
result.Data.Add(clients);
}
In view,
#model IEnumerable<Midlab.FreightOnce.BusinessObjects.ClientList
#*i need filter condition here*#
#foreach (var item in Model)
{
--rendering list here
}
Thanks
The easiest approach for a beginner I will suggest is, to make two different methods in controller, and two views associated with these controllers. First controller function will be a get function and the view associated with this will open filter lists, user will select the filter criteria and submit it, the second controller function which is a post function will receive the request, fetch records based on filter criteria and returns the response in IEnumerable list to the second view. The Other approach is to use JQuery.ajax calls.
Related
I am trying to write a specific value to a page in ASP.NET Core 6. I found multiple solutions with iterators but I am not able to write a single value from non-iteratable models / instances (no enumerators & lists) to a page.
public class UserViewModel
{
public string Id { get; set; }
public string UserName { get; set; }
public string Email { get; set; }
}
This models purpose is to get filled with values from the Identity Framework.
public UserViewModel umodel { get; set; }
Said model gets instanced, filled without any problems - it holds values (checked via console) in page.cshtml.cs:
var user = await _userManager.FindByIdAsync(id);
UserViewModel UserModel = new UserViewModel();
UserModel.UserName = user.UserName;
UserModel.Email = user.Email;
UserModel.Id = user.Id;
Console.WriteLine(UserModel.UserName);
Console.WriteLine(UserModel.Id);
Console.WriteLine(UserModel.Email);
If I try to access it on the corresponding page (page.cshtml) I can only access its name without any problems:
#Html.DisplayNameFor(model => model.umodel.Email)
When I want to access its content there is no value on the page.
#Html.DisplayFor(model => model.umodel.Email)
How can I access the values in this model on a razor page? All the solutions I found based on some kind of iterator and therefore models that had some kind of enumerator or where instanced and filled as a list.
From the code you posted, you aren't populating the page's UserViewModel property. You instantiated a different UserViewModel instance. You wrote the values of that to the Console, but the actual model property (umodel) has not been populated.
Try this in the OnGet method:
var user = await _userManager.FindByIdAsync(id);
umodel.UserName = user.UserName;
umodel.Email = user.Email;
umodel.Id = user.Id;
When rendering property values, you don't need the DisplayFor helper (unless you are using display templates). You just need to prefix the property with #:
#Model.umodel.UserName
I figured it out. There hast to be an instance of the model / class but in a specific way and naming. See following example:
Model:
public class IdentityUserModel
{
public string Id { get; set; }
public string ?UserName { get; set; }
public string ?Email { get; set; }
}
Reference to model in the Main class of the Page (page.cshtml.cs):
public IdentityUserModel IUserModel { get; set; }
Then the important part in the OnGet/OnGetAsync function(?) (page.cshtml.cs):
IUserModel = new(); // <-- instance
var user = [whatever...]
IUserModel.UserName = user.UserName;
IUserModel.Email = user.Email;
IUserModel.Id = user.Id;
Then to write on the page.cshtml:
#Model.IUserModel.Id
My understanding is that there has to be an instance of the class in die page context with exactly the same name (therefore = new() without instance name). I may have been blind but reading throug microsofts learn pages again this is was not clear at all to me.
Thanks to Mike Brind for sending me in the right direction with his input.
I have an index.chtml set up with about 10 ActionLinks. Those actionLinks trigger different ActionResult functions within the controller since each of them essentially perform unique queries on a data model.
I also have an entities object named db which has all the data. Instead of just displaying all the data, I want to perform complex filtering on the entities object to find where certain properties of records are null or where a property is greater than some input then returns a view of all columns on only those records that were filtered.
Find nulls:
public class printJobsController : Controller {
private PrintJobsEntities db = new PrintJobsEntities
public ActionResult IncompleteJobs {
//get jobs where processDate is null
...
}
}
Find where count is greater than 10:
public class printJobsController : Controller {
private PrintJobsEntities db = new PrintJobsEntities
public ActionResult JobsGreaterThan(int limit) {
//group by printerName and find counts greater than limit
...
}
}
How do I go about doing this?
Seems you are trying to populate the View with filtered data as per your request parameter in controller action.
You could follow the below steps to achieve what you are trying to:
Your imaginary Data Model
public class PrinterJob
{
[Key]
public int PrinterId { get; set; }
public string PrinterName { get; set; }
public int PrintedBy { get; set; }
public int TotalPrint { get; set; }
}
Sample Data In Database:
Controller Action:
public ActionResult <PrinterJob> JobsGreaterThan(int limit) {
var printCountByGroup =
(from objPrint in _context.PrinterJobs group objPrint by new {
objPrint.PrinterName, objPrint.PrintedBy, objPrint.TotalPrint
}
into grp where grp.Sum(p => p.TotalPrint) > limit
select new {
PrinterName = grp.Key.PrinterName, PrintedBy = grp.Key.PrintedBy,
TotalPrint = grp.Key.TotalPrint
});
return View(printCountByGroup);
}
Output After Applying Filter:
Note: Here I am trying to filter printer information which printed more then 30 printing jobs.
Hope it would help you to achieve your goal. If you still have any problem feel free to let me know.
I have a class in Entity framework 5 (using MVC 4):
public class JobFunction
{
public int Id { get; set; }
public string JobFunctionName { get; set; }
public int StatusId { get; set; }
public Status JFStatus { get; set; }
}
In my OnModelCreating method, I establish a FK relationship with the Status table as follows:
modelBuilder.Entity<JobFunction>().HasRequired(a => a.JFStatus).
WithMany().HasForeignKey(u => u.StatusId).WillCascadeOnDelete(false);
In my controller, I get a list of JobFunction objects as follows:
List<JobFunction> jfList = uow.JobFunctionRepository.GetAll().ToList<Catalog>();
where uow is my Unit of Work object, and JobFunctionRepository is defined. When I examine any JobFunction object in jfList, I see the following in my watch window:
Id: 1
JfStatus: null
JobFunctionName: "Manager"
StatusId: 2
Note that JFStatus is null. My question is: what provisions do I make in my code to initialize JFStatus to the appropriate Status object (based on the value of StatusId), during my GetAll call?
Thanks in advance.
-Zawar
You need some instrument to apply eager loading when you load the data through your repository. For example you could give your GetAll method a parameter list of expressions for the navigation properties you want to include in your query:
using System.Data.Entity;
//...
public IQueryable<JobFunction> GetAll(
params Expression<Func<JobFunction, object>>[] includes)
{
IQueryable<JobFunction> query = context.JobFunctions;
foreach (var include in includes)
query = query.Include(include);
return query;
}
Then you call it like so:
List<JobFunction> jfList = uow.JobFunctionRepository
.GetAll(jf => jf.JFStatus)
.ToList();
The JFStatus property should be filled now.
I have a CustomerOrder-view where I would like to change an existing CustomerOrder.
I have a viewmodel that very simpliefied looks something like this:
public class CustomerOrderViewModel
{
public int ID { get; set; }
public Customer Customer { get; set; }
public DateTime Date { get; set; }
public IEnumerable<OrderRow> OrderRows { get; set; }
}
public class OrderRow
{
public int id { get; set; }
public int price { get; set; }
}
public class Customer
{
public string Name { get; set; }
}
I also have a database with mapping tables / fields.
In my GET Action Method I load the Order with the help of Automapper like this:
var customerOrder = using (var ctx = new My_Entities()) {
return ctx.CustomerOrders.
Include("Orderrows").
Include("Customer").
Single(o => o.CustomerOrderID == id);
}
var model= AutoMapper.Mapper.DynamicMap<DataAccessLayer.CustomerOrder, CustomerOrderViewModel>(customerOrder);
In the View I use Knockout to bind to a viewmodel there, where the user can update the CustomerOrder. That includes editing Customer information and adding new orderrows etc.
Then in the post back a map the ViewModel back to the ObjectContext CustomerOrder:
var customerOrderToBeSaved =
AutoMapper.Mapper.DynamicMap<CustomerOrderViewModel, CustomerOrder>(
customerOrderViewModel);
try
{
using (var ctx = new MyEntities())
{
ctx.CustomerOrders.Attach(customerOrderToBeSaved);
ctx.CustomerOrders.ApplyCurrentValues(customerOrderToBeSaved);
...
ctx.SaveChanges();
}
}
I get the error message: An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key.
OK, that I can understand. But how should I go about this? Can I get the existing object and apply Changes to that one, because that is really what I'd like. I've tried to look up the old one and detach it but I haven't got it to wrok.Perhaps I'm doing this in a completely wrong way. Please advice.
You should not attach customerOrderToBeSaved, see MSDN about the argument of ApplyCurrentValues.
The detached object that has property updates to apply to the original object.
So you've got to load the entity from the database into the context and then ApplyCurrentValues with the detached object that has the new values.
You don't have to load the row from the database to update it.
You can do something like this:
var entity = ctx.CustomerOrders.Attach(customerOrderToBeSaved);
ctx.Entry( entity ).State = EntityState.Modified;
ctx.SaveChanges();
This will tell EF to issue an UPDATE SQL statement that overwrites all the columns in the record.
You can select which columns you want to update like this:
var entity = ctx.CustomerOrders.Attach(customerOrderToBeSaved);
var entry = ctx.Entry( entity );
entry.Property( o => o.<ColumnPropertyToUpdate> ).IsModified = true;
entry.Property( o => o.<ColumnPropertyToUpdate> ).IsModified = true;
...
ctx.SaveChanges();
If you do this, EF will only include the columns you've marked as modified in the UPDATE statement.
I am relatively new to REST and WebAPI by Microsoft. We are implementing a hub REST service that will house several types of object gets and sets. Being the lead on the project, I am being tasked with coming up with the proper Uri design we are going with. I was wondering what thoughts were on war is better. Yes I specifically phased that without using the word "standard".
Here are the options my team and I are currently entertaining:
Http://servername/API/REST/Ldap/AD/employees?username=jsmith
Http://servername/API/REST/Ldap/AD/employee/UserName?searchTerm=jsmith (this seems RPC to me)
Http://servername/API/REST/Ldap/AD/employees/getusername?searchterm?jsmith
We are also creating a Soap version hence the rest in the Uri.
Thanks for the input
I recommend you take a look at Web API Design from Brian Mulloy. He has several recommendations when it comes to searching and filtering.
Simplify associations - sweep complexity under the ‘?’
Most APIs have intricacies beyond the base level of a resource.
Complexities can include many states that can be updated, changed,
queried, as well as the attributes associated with a resource. Make it
simple for developers to use the base URL by putting optional states
and attributes behind the HTTP question mark. Keep your API intuitive
by simplifying the associations between resources, and sweeping
parameters and other complexities under the rug of the HTTP question
mark.
Tips for search
While a simple search could be modeled as a resourceful API (for
example, dogs/?q=red), a more complex search across multiple resources
requires a different design. If you want to do a global search across
resources, we suggest you follow the Google model:
Global search
/search?q=fluffy+fur
Here, search is the verb; ?q represents the query.
Scoped search
To add scope to your search, you can prepend with the scope of the
search. For example, search in dogs owned by resource ID 5678
/owners/5678/dogs?q=fluffy+fur
Notice that the explicit search has been dropped from the URL and
instead it relies on the parameter 'q' to indicate the scoped query.
Pagination and partial response
Support partial response by adding optional fields in a comma
delimited list.
/dogs?fields=name,color,location
Use limit and offset to make it easy for developers to paginate
objects.
/dogs?limit=25&offset=50
To Oppositional's comment, this is what I put together some time ago.
https://groups.google.com/d/msg/servicestack/uoMzASmvxho/CtqpZdju7NcJ
public class QueryBase
{
public string Query { get; set; }
public int Limit { get; set; }
public int Offset { get; set; }
}
[Route("/v1/users")]
public class User : IReturn<List<User>>
{
public string Id { get; set; }
public string FirstName { get; set; }
public string MiddleName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
}
public class RequestFilterAttribute : Attribute, IHasRequestFilter
{
#region IHasRequestFilter Members
public IHasRequestFilter Copy()
{
return this;
}
public int Priority
{
get { return -100; }
}
public void RequestFilter(IHttpRequest req, IHttpResponse res, object requestDto)
{
var query = req.QueryString["q"] ?? req.QueryString["query"];
var limit = req.QueryString["limit"];
var offset = req.QueryString["offset"];
var user = requestDto as QueryBase;
if (user == null) { return; }
user.Query = query;
user.Limit = limit.IsEmpty() ? int.MaxValue : int.Parse(limit);
user.Offset = offset.IsEmpty() ? 0 : int.Parse(offset);
}
#endregion
}
[Route("/v1/users/search", "GET")]
[RequestFilter]
public class SearchUser : QueryBase, IReturn<PagedResult<User>> { }
public class UsersService : Service
{
public static List<User> UserRepository = new List<User>
{
new User{ Id="1", FirstName = "Michael", LastName = "A", Email = "michaelEmail" },
new User{ Id="2", FirstName = "Robert", LastName = "B", Email = "RobertEmail" },
new User{ Id="3", FirstName = "Khris", LastName = "C", Email = "KhrisEmail" },
new User{ Id="4", FirstName = "John", LastName = "D", Email = "JohnEmail" },
new User{ Id="4", FirstName = "Lisa", LastName = "E", Email = "LisaEmail" }
};
public PagedResult<User> Get(SearchUser request)
{
var query = request.Query;
var users = request.Query.IsNullOrEmpty()
? UserRepository.ToList()
: UserRepository.Where(x => x.FirstName.Contains(query) || x.LastName.Contains(query) || x.Email.Contains(query)).ToList();
var totalItems = users.Count;
var totalPages = (int)Math.Ceiling((decimal)totalItems / (decimal)request.Limit);
var currentPage = request.Offset;
users = users.Skip(request.Offset * request.Limit).Take(request.Limit).ToList();
var itemCount = users.Count;
return new PagedResult<User>
{
TotalItems = totalItems,
TotalPages = totalPages,
ItemCount = itemCount,
Items = users,
CurrentPage = currentPage
};
}
}