Laravel 5 Saving the Selected input from a Form::Select - database

Question

I a struggling to save the chosen information from my selection box. I get the message:
"SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (clientpad_notes.notebooks, CONSTRAINT notebooks_contact_id_foreign FOREIGN KEY (contact_id) REFERENCES contacts (id) ON DELETE CASCADE) (SQL: insert into notebooks (name, contact_id, note_description, note_body, user_id, updated_at, created_at) values (assddsaasdadasasd, 3, saS, ssss, 2, 2018-03-03 19:18:51, 2018-03-03 19:18:51)
My problem is that I am bringing in information to notes create page from contacts table. So I have my tables linked with authentication with user_id and inside the notes tables I have contacts_id. I am aiming to select and save a contact name fetching it by it's id, when creating a new note. It is possible I have been going around doing this in a wrong way, I am a beginner at Laravel so any help would be appreciated.
Here is my notes controllers and create a note page.
NotesController.php
public function create()
{
$user_id = auth()->user()->id;
$user = User::find($user_id);
$contacts = Contact::find($user->contacts)->pluck('fullName');
return view('notebooks.create')->with('contacts', $contacts)->with('user', $user);
}
/**
* Store a newly created resource in storage.
*
* #param \Illuminate\Http\Request $request
* #return \Illuminate\Http\Response
*/
public function store(Request $request)
{
$this->validate($request,[
'name' => 'required',
'contact_id' => 'required',
'note_description' => 'required',
'note_body' => 'required',
]);
//Create a note
$notebook = new Notebook;
$notebook->name = $request->input('name');
$notebook->contact_id = $request->input('contact_id');
$notebook->note_description = $request->input('note_description');
$notebook->note_body = $request->input('note_body');
$notebook->user_id = auth()->user()->id; //currently logged in user show their notes
$notebook->save();
return redirect('/dashboard')->with('success', 'Your Note Was Created');
}
create.blade.php
<div class="col-6 col-sm-3">
{{Form::label('contact_id', 'Choose your Contact')}}
{{Form::select('contact_id', $user->contacts->pluck('fullName'), $contacts, ['class' => 'form-control'])}}
</div>
</div>
In the database which saved notes I have this:
Schema::create('notebooks', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id')->unsigned()->nullable();
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->integer('contact_id')->unsigned()->nullable();
$table->foreign('contact_id')->references('id')->on('contacts')->onDelete('cascade');
$table->string('name');
$table->mediumText('note_description');
$table->mediumText('note_body');
$table->timestamps();
});

Answer 1

You made small mistake when working with Id's from other tables. You should check if the ID actually exists in the target table.
$this->validate($request,[
'name' => 'required',
'contact_id' => 'required|exists:contacts', //This will validate that the contact ID actually exists.
'note_description' => 'required',
'note_body' => 'required',
]);
//Create a note
$notebook = new Notebook;
$notebook->name = $request->input('name');
$notebook->contact_id = $request->input('contact_id');
$notebook->note_description = $request->input('note_description');
$notebook->note_body = $request->input('note_body');
$notebook->user_id = auth()->user()->id; //currently logged in user show their notes
$notebook->save();
Laravel validation#rule-exists
Update
$this->validate($request,[
'name' => 'required',
'contact_id' => 'required|exists:contacts,id', //check contacts table, for column ID
'note_description' => 'required',
'note_body' => 'required',
]);

Answer 2

SO after lots of searching I found a solution. In Create I had to use mapping:
public function create(Contact $contact)
{
$user_id = Auth::user()->id;
$user = User::find($user_id);
$contacts = $user->contacts->mapWithKeys(function($contact){
return [$contact->id => $contact->fullName];
});
// dd ($contacts);
return view('notebooks.create')->with('contacts', $contacts)->with('user', $user);
}
Then in Select I just called for this:
{{Form::label('contact_id', 'Choose your Contact')}}
{{Form::select('contact_id', $contacts, null, ['class' => 'form-control'])}}
Works like a charm, in case anyone else finds this useful