Question

I have a few tables I’m dealing with regarding a “Goals” application (screen grab is below). I’m using MVC 3, razor and linq.

I am using a model, goalsModel, to retrieve my data:

public goals GetGoal(int id)
{
return qDB.goals.Single(g => g.goalID == id);
}


I’d like Activities to be available as well… where I could do something like:

public goals GetGoalActivities(int id)
{
return qDB.ilpActivities.Where(g => g.goalID == id);
}

However this returns an error. The smart tags for don’t show any columns available for ilpActivities. I’ve seen several methods of writing code in the controller where it’s a linq query – but I’d really like to use the format above if possible for consistency.

Here’s a link that I’ve been trying to follow that may do what I want. Keep in mind, however, I’ll eventually be editing existing activities, creating new ones, and deleting activities. The link: http://geekswithblogs.net/michelotti/archive/2007/12/30/118076.aspx

[Edit]
I couldn’t post an image as a new user. My tables consist of goalID as the primary key of goals and foreign key in ilpActivities. ilpActivities has a primary key of activityID.

[Update]

My tables look something like this (simplified to include relevant fields):
goals: goalID, goalName, goalDescr
ilpActivities: activityID, goalID, activityName

I have a dbml file: employeeDataClasses.dbml that was generated for me after dragging the tables in on design mode. It recognized ilpActivities as a child of goals

I have a goalsModel.cs file:

namespace ILP.Models
{
public class goalsModel
{
    #region services
    public interface IGoalsService
    {
        List<goals> GetAllGoals(string oprID);
        bool CreateGoal(goals poll);
        List<ilpGoalStatus> GetStatuses();
        goals GetGoal(int id);
        bool EditGoal(goals poll);
        List<ilpActivity> GetGoalActivities(goals goal);
    }

    public class AssetService : IGoalsService
    {
        private goalsDataClassesDataContext qDB;

        public AssetService()
        {
            qDB = new goalsDataClassesDataContext();
        }

        #region IGoalsService Members
            public List<ilpActivity> GetGoalActivities (goals goal) 
        {
            IEnumerable<ilpActivity> activities = from g in qDB.goals
                         join a in qDB.ilpActivities on g.goalID equals a.goalID
                         where a.goalID == goal.goalID
                         select a;

            return activities.ToList();
        } 

In my controller:

namespace ILP.Controllers
{
public class HomeController : Controller
{

    private goalsModel.IGoalsService qService;

    public HomeController()
    {
        qService = new goalsModel.AssetService();
    }
        [Authorize]
    public ActionResult _CreateActivity(int goalID)
    {
        //var status = qService.GetStatuses();
        ViewBag.Status = new SelectList(qService.GetStatuses().ToList(), "goalStatusID", "goalStatus");
// not sure what to do here to get activity model in....
        return PartialView();
    }

In my create activity partialview I’m only getting access to the goals model:

@model ILP.Models.goals

<script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")"     type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

@using (Html.BeginForm()) {
@Html.ValidationSummary(true)
<fieldset>
    <legend>Create an Activity</legend>

    <div class="editor-label">
        @Html.LabelFor(model => model.goalName)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.goalName)
        @Html.ValidationMessageFor(model => model.goalName)
    </div>
.... etc....

In my view I need to access activityName of ilpActivities – but the only options are coming from goals table.

Answer 1

Can you change:

public goals GetGoalActivities(int id) { return qDB.ilpActivities.Where(g => g.goalID == id); }

to:

public IEnumerable<ilpActivities> GetGoalActivities(int id) { return qDB.ilpActivities.Where(g => g.goalID == id); }

because qDB.ilpActivities.Where(g => g.goalID == id); returns an IEnumerable of activites, not a single goal like the previous method.