Can a single controller function in ASP.NET MVC4 be used to send back two arrays to the view?

Continuing from my previous query here, I am working with a model called SchoolTestsPerModulePerStudent which looks like this:

public partial class SchoolTestsPerModulePerStudent
{
    public long StudentID { get; set; }
    public long ModuleID { get; set; }
    public System.DateTime TestDate { get; set; }
    public int TestResult { get; set; }
}

In the previous question, I shared a code snippet from a controller function:

    var query = from b in db.SchoolTestsPerModulePerStudent
                where b.StudentID.Equals(2)
                select b;
        return View(query.ToArray());

The issue I am facing now is the need to split the results from 'b' into two separate arrays that I can use in JavaScript within my view.

My current challenges are:

1. Is it possible to split the array of SchoolTestsPerModulePerStudent records into two separate arrays, one containing only TestDate and the other containing only TestResult? I am struggling to find a way to achieve this.

2. How can I return both of these new arrays using only one function? I aim to avoid running the query again (which may cause a delay) and ensure that the elements in both arrays are in the same order.

Furthermore, based on the advice I received in my previous query, I understand that the arrays should be returned as JSON using @Json.Encode(Model). Can I then use @Json.Encode(TestDatesArray) and @Json.Encode(TestResultsArray) in this scenario?

Answer №1

Hey Jim,

If you want to achieve this, you can create a new model class and easily extract the relevant data from your query results into an array. Based on your requirements, it seems like you are only interested in the properties TestDate and TestResult without any specific order.

New Model Structure:

public partial class SchoolTestResultsModel
{
    public int[] TestResults { get; set; }

    public DateTime[] TestDates { get;set; }
}

Updated Method:

var query = from b in db.SchoolTestsPerModulePerStudent
            where b.StudentID.Equals(2)
            select b;

var model = new SchoolTestResultsModel();
model.TestDates = query.Select(x => x.TestDate).ToArray();
model.TestResults = query.Select(x => x.TestResult).ToArray();
return View(model);

Next, you can encode the data into JSON format like this:

@Json.Encode(Model.TestResults)
@Json.Encode(Model.TestDates)

Make sure to update your view to utilize the new model structure.

@model SchoolTestResultsModel

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