How to handle one to many relationship in controller

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Hello Programmers, Please bear with me with the way i am going to ask my question because i am learning ASP.NET MVC on my own.

I have two class : Shoe and color.

A shoe will have many colors.

Shoe Entity

C#

public string shoeId{get;set;}
public string BrandName {get;set;}
public string Size {get;set:}
public virtual string ColorId {get;set:}
[ForeignKey("ColorId")]
public virtual ICollection(Color) Colors {get;set;}

Color Entity

C#

public string ColorId {get;set;}
public string ColorName {get;set;}
public string PictureSamnple {get;set;}
public virtual string shoeId {get;set:}

If i scaffold both entitys in the controller, i will have problem with the create method when trying to Create a new Shoe.
If i use @Html.HiddenFor(e => e.ColorId)
@Html.HiddenFor(e => e.shoeId) in the Create view of SHoe, i will get an error when trying to submit.

what i am trying to achive is that when you re creating the shoe, you will also create a color before submitting it but it is kind of difficult. please, help me.

Posted 14-Oct-15 0:07am

Member 10285969

Updated 14-Oct-15 0:32am

Suvendu Shekhar Giri

v2

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[no name] 14-Oct-15 6:22am

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "ShoeId,BrandName,Size,ShoeColorId")] Shoe shoe)

from the properties to bind here... how am i going to handle that of the 'ShoeColorId' because i want that items in shoecolor can only be created when creating s 'Shoe'.
That is , you can't create shoecolor on its own except you are creating a new shoe.

Please, programmer help me out.

Suvabrata Roy 14-Oct-15 6:34am

What kind off error you are facing?
Do you have any property named ShoeColorId?

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Anupam Shukla 2009 · Answer 1 · 2015-10-14T03:43:00

Solution 1

Use fluent api for mapping entities in efficient way. For example you can map the one to many relationship between shoe and colors in following way -

C#

public class ShoeMapper : EntityTypeConfiguration<Shoe>
    {
        public ShoeMapper()
        {
            HasMany(x => x.Colors).WithRequired().HasForeignKey(x => x.ShoeId);
        }
    }

Apart from this you should create a separate table

SQL

tbl_Colors

SQL

[int_Id, varchar_Name]

then a junction table

SQL

tbl_Shoes_Colors

SQL

[fk_Shoes_Id, fk_Colors_Id, varchar_SampleImage]

to map relation as per normalization recommendation.

Posted 14-Oct-15 3:43am

Anupam Shukla 2009

Comments

[no name] 14-Oct-15 11:12am

@model TestingSHOE.Models.Shoe

@{
ViewBag.Title = "Create";
Layout = "~/Views/Shared/_Layout.cshtml";
}

Create

@using (Html.BeginForm())
{
@Html.AntiForgeryToken()

<div class="form-horizontal">

Shoe

@Html.ValidationSummary(true, "", new { @class = "text-danger" })
@Html.HiddenFor(model => model.ShoeId)
@Html.HiddenFor(model => model.ShoeColorId)

<div class="form-group">
@Html.LabelFor(model => model.BrandName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.BrandName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.BrandName, "", new { @class = "text-danger" })
</div>
</div>

<div class="form-group">
@Html.LabelFor(model => model.Size, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Size, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Size, "", new { @class = "text-danger" })
</div>
</div>

<div class="form-group">
@Html.LabelFor(model => model.Trekable, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
<div class="checkbox">
@Html.EditorFor(model => model.Trekable)
@Html.ValidationMessageFor(model => model.Trekable, "", new { @class = "text-danger" })
</div>
</div>
</div>

<div class="form-group">
@Html.LabelFor(model => model.Comfortable, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
<div class="checkbox">
@Html.EditorFor(model => model.Comfortable)
@Html.ValidationMessageFor(model => model.Comfortable, "", new { @class = "text-danger" })
</div>
</div>
</div>

<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create new Shoe" class="btn btn-primary" />
</div>
</div>
</div>
}

<div>
@Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}

What i mean to say is that i want to both create the shoe and shoeColor together. Just like in viewModel but how will i handle the foreignKey in the Create method in Controller.