How to update multiple entries (one to many relationship laravel)

I keep getting the Call to a member function fill() on string error when I try and update my database. My store and edit functions in my controller work fine but I can't seem to be update multiple entries. I have one form that adds data to two different tables (Articles & Deals). An Article has many deals. A deal has one Article. I can populate the edit form with the data from the Deals table but the fill() function (if that's the correct thing to use) isn't working. The problem is in the foreach of Articles Controller I think.

I'm using Laravel 5.

The Articles Table has: id, title, image, description, address. The Deals table has: id, dealname, article_id, dayID.

Articles Controller- Update

 public function update(ArticleRequest $request, $id)
    {
     $article = Article::find($id);
      if( $request->hasFile('image') ){
            // photo saving stuff.
       }
    $article->fill($request->input())->save();

    $deals = $request->input('dealname');
    $articleID = $article->id;
    $n = 1;
foreach($deals as $deal) {
    $new_user_data = array('dealname' => $deal, 'article_id' => $articleID, 'dayID' => $n++);
    $deal->fill($new_user_data);
    $deal->save();
        }   
        return redirect('/');
    }

Form

{!! Form::model($article, ['route' => ['articleUpdate_path', $article->id], 'files' => true, 'method' => 'PATCH']) !!}

    {!! Form::label('title','TITLE') !!}
    {!! Form::text('title', null, ['class' => 'form-control']) !!}
    {!! $errors->first('title','<p class="error">:message</p>')!!}

    {!! Form::label('image','PHOTO') !!}
    {!! Form::file('image', null, ['class' => 'form-control']) !!}

    {!! Form::label('description','DESCRIPTION') !!}
    {!! Form::textarea('description', null, ['class' => 'form-control']) !!}

@foreach ($article->deals as $deal)

    @if($deal->dayID == '1' )
     {!! Form::label('dealname','Monday') !!}
     {!! Form::text('dealname[]', $deal->dealname, null, ['class' => 'form-control', 'id' => '1']) !!}
     @endif

    @if($deal->dayID == '2' )
     {!! Form::label('dealname','Tuesday') !!}
     {!! Form::text('dealname[]', $deal->dealname, null, ['class' => 'form-control', 'id' => '2']) !!}
    @endif
    @if($deal->dayID == '3' )
      {!! Form::label('dealname','Wednesday') !!}
      {!! Form::text('dealname[]', $deal->dealname, null, ['class' => 'form-control', 'id' => '3']) !!}
    @endif
@endforeach

    {!! Form::label('address','ADDRESS') !!}
    {!! Form::text('address', null, ['class' => 'form-control']) !!}

    {!! Form::close() !!}

Articles Controller -Store

    public function store(ArticleRequest $request)
    {
        $image_name = $request->file('image')->getClientOriginalName();
        $request->file('image')->move(base_path().'/public/images', $image_name);
        $article = ($request->except(['image']));
        $article['image'] = $image_name; 

        $article = Article::create($article);

// GET INPUT
        $deals = $request->input('dealname');

// GET ID OF ARTICLE
        $articleID = $article->id;
// N is the day id that increments
        $n = 1;
        foreach($deals as $deal) {

           Deal::create(['dealname' => $deal, 'article_id' => $articleID, 'dayID' => $n++]);

        }   

       return redirect()->route('articles_path');

    }

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