Issues with search query - laravel

Question

I am trying to run a search query on all of my comments. I am encountering a number of problems. I would to have two search queries one that runs a search on the comment ID and another that runs a search on the username that is connected to the comment through the user_id FK.
Currently im getting the problem:
Too few arguments to function Illuminate\Support\Collection::get(), 0 passed in
Tables:
Comment- id, comment, user_id, timestamps
User - id, name, username
Models:
class Comment extends Model
{
public function author()
{
return $this->belongsTo('App\User','user_id');
}
}
Controller:
public function index(Request $request)
{
$comment =Comment::paginate(10);
$id=$request->input('id');
$name=$request->input('username');
if(!empty($id)){
$comment->where('id', $request->input('id') )->get();
}
if(!empty($name)){
$comment->where($comment->author->username, 'LIKE', '%'.$name.'%')->get();
}
return view('comments.index')->withComment($comment);
}
View:
<div class="panel-body">
{!! Form::open(['route' => 'comments.index', 'method' => 'GET']) !!}
<div class="col-md-5">
{!! Form::label('id', 'Search By ID:') !!}
{!! Form::text('id', null, array('class' => 'form-control')) !!}
</div>
<div class="col-md-5">
{!! Form::label('username', 'Search By Username:') !!}
{!! Form::text('username', null, array('class' => 'form-control')) !!}
</div>
<div class="col-md-2">
{!! Form::submit('Find Comments', array('class' => 'btn btn-send ')) !!}
</div>
{!!Form::close()!!}
</div>
#foreach($comment as $comments)
//data
#endforeach

Answer 1

The paginate function immediately executes the query for you, so you are using Collection functions after that. The get function on collections expects a key as a parameter, this is the problem.
To fix this, you can either remove the ->get() or use the paginate function at the end of your query as shown below.
$comment = Comment::query();
$id = $request->input('id');
$name = $request->input('username');
if (!empty($id)) {
$comment = $comment->where('id', $request->input('id'));
}
$result = $comment->paginate(10);

Answer 2

Since You have Paginated already
public function index(Request $request)
{
$comment = new Comment();
$id=$request->input('id');
$name=$request->input('username');
if(!empty($id)){
$comment->where('id', $request->input('id') )->get();
}
if(!empty($name)){
$comment->where($comment->author->username, 'LIKE', '%'.$name.'%');
}
return view('comments.index')->withComment($comment->paginate(10));
}
You cannot paginate and get it again, its like using SELECT statement twice on same object.