Laravel在更新之前使用数据库检查提交的值

Ive been trying to check the fields that a user submitted from the form with the database fields to see if there was any change made if it was let the save() query run, else send a message that no changes made

    public function update(Request $request,$id)
   {

        $this->validate($request, [
       'title' =>'required',
       'notes' =>'required',
            'description' =>'required'
              ]);
        $editinc = Editted::find($id);
        if($editinc > 0) {
            dd($editinc);
        }

   $data = $request->all();

        $post= Joborder::find($id);

 //before this query runs i want to check my fields with db            
 //if no changes has been this should not be executes

  $post->fill($request->input())->save();    


return redirect('/thehood')->with('success','WE DID IT.');
}

Additional Info : im a newbie in Laravel so take it easy on me.

if isDirty() is possible , how ? I checked lots of questions still have no clue how to use it.

if its not possible then is there a Laravel way? something that checks and if there are difference it will ONLY change their value NOT perform a full update on every field.

Edited : this could be a way but I'm pretty sure there is Laravel way that I just don't know about it??!

      $post= Joborder::find($id);
    $data = $request->all();
    foreach($data as $dat => $val) {
      if($dat=="_token" || $dat=="_method") continue;
   if($data[$dat] == $post->$dat) {
      continue;
      }else{
         $post->$dat = $data[$dat];
         $post->save();
         $flag=1;
      }
    }           

     if($flag == 0 )      {
       return redirect('/thehood')->with('success','NO EDIT HAS BEEN DoNE.');
    }else{
     return redirect('/thehood')->with('success','one or more Field has been edited .');

 }

Here is what you can do, please enter all the fields you want to compare in the query as I am not entering all of them.

$exist = Joborder::where('title', $request->input('title'))->where('notes', $request->input('notes'))->first();
if($exist)
{
  //Insert into database.
}