Laravel：如何获取外键并将其传递给控制器

Question

I'm trying to get a the id from the category table which is the foreign key in the article table and placing it in a hidden field in a view when creating an article, I then want to pass it to the article controller , i've had a go at trying but unsure how to do this. The error that is displaying is

Too few arguments to function App\\Http\\Controllers\\ArticleController::create(), 0 passed and exactly 1 expected

Answer 1

Don't pass anything in create method, instead display dropdown list of category in your article view so that you can select any category, then get Category id from that dropdown to your store method.

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Category;


class ArticleController extends Controller
{
/**
 * Display a listing of the resource.
 *
 * @return \Illuminate\Http\Response
 */

public function index()
{
}

/**
 * Show the form for creating a new resource.
 *
 * @return \Illuminate\Http\Response
 */
public function create()
{
  $categories = Category::pluck('title', 'id')
  return view('article.create', ['categories' => $categories]);
}

/**
 * Store a newly created resource in storage.
 *
 * @param  \Illuminate\Http\Request  $request
 * @return \Illuminate\Http\Response
 */
public function store(Request $request)
{
  $input = $request->all();
  Article::create($input);
  return redirect('article');
}

/**
 * Display the specified resource.
 *
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function show($id)
{

}

/**
 * Show the form for editing the specified resource.
 *
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function edit($id)
{
}

/**
 * Update the specified resource in storage.
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function update(Request $request, $id)
{

}

/**
 * Remove the specified resource from storage.
 *
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function destroy($id)
{

}

}

And in your View

{!! Form::open(array('action' => 'ArticleController@store', 'id' => 'createArticle')) !!}
@csrf


    <div class="row large-12 columns">
         {!! Form::label('', 'Category:') !!}
         {!! Form::select('category_id', $categories, null, ) !!}

        {!! Form::label('', 'Title:') !!}
        {!! Form::text('title', null, ['class' => 'large-8 columns']) !!}
    </div>
{!! Form::close() !!}