c# - MVCCheckBoxList catering for a 1 to Many relationship -


i have class has 1 many relationship class. use class car , class gears. need create form, registers car , user needs specify choice of gears. 

public class car {    public int id { get; set; }    public string desc { get; set; }    public list<gear> gears { get; set; } } public class gear {    public int gid { get; set; }    public int gname { get; set; } }

using asp.net mvc 5, have create form, have scaffolded car model, , within form, wish have checkboxlist of gears,

i have viewmodel have provided checkboxlist below: 

public class gearsviewmodel {     public gear _gear {get; set; }     public bool _ischecked {get; set;} }

controller looks like:

gears fetched db context "gearr","gear1","gear2","gear3","gear4","gear5","gear6","gear7"

public action create() {     viewbag.gears = new selectlist(db.gears, "gid","gname");     list<gearviewmodel> _gears= new list<gearviewmodel>();     foreach(gear g in viewbag.gears)     {         _gears.add(new gearviewmodel(g, false));     }     viewbag.gearschecklist = _gears.tolist();     return view(); }

now, part i'm getting stuck at, how display , capture details in createview.

i need assistance on how design create form , how capture info.

firstly, view models should not contain data models when editing. view models should (add validation , display attributes appropriate)

public class carvm {     public int? id { get; set; }     public string description { get; set; }     public list<gearvm> gears { get; set; } } public class gearvm {     public int id { get; set; }     public string name { get; set; }     public bool isselected { get; set; } }

and method be

public actionresult create() {     var gears = db.gears;     carvm model = new carvm     {         gears = gears.select(x => new gearvm         {             id = x.gid,             name = x.gname         }).tolist()     };     return view(model); }

and view be

@model carvm .... @using (html.beginform()) {     ..... // elements editing id , description properties of carvm     @for (int = ; < model.gears.count; i++)     {         <div>             @html.hiddenfor(m => m.gears[i].id)             @html.hiddenfor(m => m.gears[i].name) // include if want in post method             @html.checkboxfor(m => m.gears[i].isselected)             @html.labelfor(m => m.gears.isselected, model.gears[i].name)         </div>     }     <input type="submit" .... /> }

then in post method

public actionresult create(carvm model) {     if (!modelstate.isvalid)     {         return view(model);     }     // id's of selected gears     ienumerable<int> selected = model.gears.where(x => x.isselected).select(x => x.id);     // initialize data models, save , redirect }

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