Method Illuminate\Support\Collection::save does not exist - php

Question

I want to create update function, but the error keep shown. Is it because of the join query or the get() or first() method. I dont know how to solve this.
Method Illuminate\Support\Collection::save does not exist.
Controller:
public function update(Request $request, $id)
{
// dd($request);
$request->validate([
'first_name' => 'max:150',
'last_name' => 'max:150',
'userD_ic' => 'max:12',
'userD_position' => 'max:50',
'userD_epf' => 'max:20',
'userD_socso' => 'max:20',
'userD_passport' => 'max:30',
'user_id' => 'numeric',
'ea_serial_no' => 'required|numeric',
'ea_employer_id' => 'required|numeric',
'ea_employee_income_tax_no' => 'required|numeric',
'ea_lhdn_branch' => 'required|max:255',
]);
$eaforms = DB::table('ea')
->join('users', 'ea.user_id', '=', 'users.id')
->join('user_details', 'ea.user_id', '=', 'user_details.user_id')
->where('ea.id', $id)
->select('ea.*', 'users.first_name', 'users.last_name', 'user_details.userD_position', 'user_details.userD_ic', 'user_details.userD_passport', 'user_details.userD_epf', 'user_details.userD_socso')
->get();
$eaforms->first_name = $request->first_name;
$eaforms->last_name = $request->last_name;
$eaforms->userD_ic = $request->userD_ic;
$eaforms->userD_position = $request->userD_position;
$eaforms->userD_epf = $request->userD_epf;
$eaforms->userD_socso = $request->userD_socso;
$eaforms->userD_passport = $request->userD_passport;
$eaforms->user_id = $request->user_id;
$eaforms->ea_serial_no = $request->ea_serial_no;
$eaforms->ea_employer_id = $request->ea_employer_id;
$eaforms->ea_employee_income_tax_no = $request->ea_employee_income_tax_no;
$eaforms->ea_lhdn_branch = $request->ea_lhdn_branch;
$eaforms->save();
return redirect()->route('ea.view', $eaforms->id)->with('update', 'add');
}
Model:
class EaForms extends Model
{
protected $table = 'ea';
use HasFactory, SoftDeletes;
protected $fillable = [
'user_id',
'ea_year',
'ea_serial_no',
'ea_employer_id',
'ea_employee_income_tax_no',
'ea_lhdn_branch',
'created_at',
'updated_at',
'deleted_at',
];
public function users()
{
return $this->belongsTo(User::class);
}
}

Answer 1

Can you try this (With your relationship method called users)
$eaforms = EaForms::where('id',$id)->first();
// Update user data
$eaforms->first_name = $request->first_name;
$eaforms->last_name = $request->last_name;
$eaforms->userD_ic = $request->userD_ic;
$eaforms->userD_position = $request->userD_position;
$eaforms->userD_epf = $request->userD_epf;
$eaforms->userD_socso = $request->userD_socso;
$eaforms->userD_passport = $request->userD_passport;
// Update EA Forms
$eaforms->users->user_id = $request->user_id;
$eaforms->users->ea_serial_no = $request->ea_serial_no;
$eaforms->users->ea_employer_id = $request->ea_employer_id;
$eaforms->users->ea_employee_income_tax_no = $request->ea_employee_income_tax_no;
$eaforms->users->ea_lhdn_branch = $request->ea_lhdn_branch;
$eaforms->users->save();
$eaforms->save();