从外键表 Laravel 中获取第一张图片

Question

Reference: Fetch first image from foreign key table but this time in Laravel.

I started playing with Laravel and I want to take first image from every post and show these in my blade.

$secondpost = DB::table('posts')
        ->orderBy('id', 'desc')
        ->skip(1)
        ->take(8)
        ->get();

foreach ($secondpost as $spost)
$secondph = DB::table('post_images')
        ->select('filename')
        ->where('post_id', $spost->id)
        ->limit(1)
        ->get()
        ->pluck('filename');

return view ('pages.index', compact('firstp', 'fph', 'secondpost', 'secondph'));

<div class="row">
 @foreach ($secondpost as $secondp)
 <div class="col-lg-3 col-md-3 col-sm-6 col-xs-6 post-ab">
  <div class="row">
   @foreach ($secondph as $sph);
    <img src="{{url($sph)}}" class="imgpost" alt="">
   @endforeach
    <div class="bottomleft">
      <p class="ab-desc">{{$secondp->marca}} {{$secondp->model}}</p>
      <p class="ab-desc">{{$secondp->pret}} Eur</p>
    </div>
    </div>
   </div>
 @endforeach
</div>

This code load only one image for every img src. Post_id is foreign key for posts table id.

Answer 1

There are few things you need to confirm.

1. You have created models for the table like Post for posts table and PostImages for post_images table. If not, follow the documentation. https://laravel.com/docs/5.8/eloquent

2. You have created the hasMany relationship in your post model with post_images . Like:

In Post model.

/**
* Get the images for the post.
*/
public function images()
{
    return $this->hasMany('App\PostImage');
}

3. Then change in your controller to use early loading, Like:

$secondpost = \App\Post::with("images")
        ->orderBy('id', 'desc')
        ->skip(1)
        ->take(8)
        ->get();

And now the view looks like:

<div class="row">
 @foreach ($secondpost as $secondp)
 <div class="col-lg-3 col-md-3 col-sm-6 col-xs-6 post-ab">
  <div class="row">
    @php
        $image = $secondp->images->first();
    @endphp
    <img src="{{url($image->filename)}}" class="imgpost" alt="">
    <div class="bottomleft">
      <p class="ab-desc">{{$secondp->marca}} {{$secondp->model}}</p>
      <p class="ab-desc">{{$secondp->pret}} Eur</p>
    </div>
    </div>
   </div>
 @endforeach
</div>

Solution: 2

You can create another relationship with hasOne to get a single image like:

// In your Post model.

/**
* Get the default image for post.
*/
public function default_image()
{
    return $this->hasOne('App\PostImage')->orderBy("id");
}

Make change in controller to use ->with("default_image") .

And in view you can just use like:

    $secondp->default_image->filename