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Editorial Team
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Asked: 2026-05-17T08:16:31+00:00

Ive got 3 tables, projects, devices and projectdevice (table that links the 2 for

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Ive got 3 tables, projects, devices and projectdevice (table that links the 2 for a many to many relation). A device is connected to an account and in the account management the device can be connected to a project. I want to do this by using checkboxes. When creating or editing a project there should be a list of all devices and the possibility to select them.
In other words, how do I fill the projectdevice table by using checkboxes?

I am using ActiveRecord to access my data

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1 Answer

  1. Editorial Team

    Well, I dont think this will automatically work, so you will have to build out the grid your self and then parse the results to re-persist them. Its not actually that hard. I have written a sample app for you below…

    Controller:

    public class HomeController : Controller
{

    [HttpGet]
    public ActionResult Index()
    {
        LinkDeviceAndProject Model = new LinkDeviceAndProject();
        Model.Devices = GetDevices();
        Model.Projects = GetProjects();
        return View(Model);
    }

    [HttpPost]
    public ActionResult Index(FormCollection SaveResults)
    {
        LinkDeviceAndProject Model = new LinkDeviceAndProject();
        Model.Devices = GetDevices();
        Model.Projects = GetProjects();

        foreach (var d in Model.Devices)
        {
            foreach (var p in Model.Projects)
            {
                string boxId = "d-" + d.Id.ToString() + "_p-" + p.Id.ToString();
                if (SaveResults[boxId] != null)
                {
                    string box = SaveResults[boxId];
                    bool boxValue = box == "true,false" ? true : false;
                    if (boxValue && d.Projects.Where(x => x.Id == p.Id).Count() == 0)
                        d.Projects.Add(p);
                    else if (!boxValue && d.Projects.Where(x => x.Id == p.Id).Count() > 0)
                        d.Projects.RemoveAll(x => x.Id == p.Id);
                }

            }
        }
        return View(Model);
    }

    private List<Device> GetDevices()
    {
        return new List<Device>() { new Device() { Id = 1, Name = "Device1" }, new Device() { Id = 2, Name = "Device2" } };
    }

    private List<Project> GetProjects()
    {
        return new List<Project>() { new Project() { Id = 1, Name = "Project1" }, new Project() { Id = 2, Name = "Project2" } };
    }

}

    Device Model:

      public class Device
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public List<Project> Projects = new List<Project>();
    }

    Project Model:

    public class Project
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Device> Devices = new List<Device>();
}

    LinkDeviceAndProject (View Model):

    public class LinkDeviceAndProject
{
    public List<Project> Projects = new List<Project>();
    public List<Device> Devices = new List<Device>();
}

    View:

    <%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<testchecks.Models.LinkDeviceAndProject>" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Index</title>
</head>
<body>
    <% using (Html.BeginForm())
       { %>
    <div>
        <table>
            <tr>
                <td></td>
                <% foreach (var p in Model.Projects)
                   {%>
                   <td><%: p.Name%></td>
                <%} %>
            </tr>

            <% foreach (var d in Model.Devices)
               { %>
               <tr>
                <td><%: d.Name%></td>
                    <% foreach (var p in Model.Projects)
                       { %>
                       <td><%: Html.CheckBox("d-" + d.Id.ToString() + "_p-" + p.Id, d.Projects.Where(x => x.Id == p.Id).Count() > 0 ? true : false)%></td>
                    <%} %>
               </tr>
            <%} %>
        </table>
        <input type="submit" value="Save" />
    </div>
    <%} %>
</body>
</html>
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