Laravel 4 /显示带有类别标题的帖子（关系PB）

Question

This is what I'd like to display on a course index page.

• Category 1 -- Course 1 -- Course 2 -- Course 3
• Category 2 -- Course 4 -- Course 5 -- Course 6

Course Table

Schema::create('courses', function($table) {      
    $table->engine = 'InnoDB';
    $table->increments('id')->unsigned();
    $table->integer('user_id')->unsigned();
    $table->string('title');
    $table->string('slug');
    $table->integer('category_id')->unsigned();
    $table->text('content');
    $table->string('meta_title');
    $table->string('meta_description');
    $table->string('meta_keywords');
   $table->timestamps();
});

Category Table

Schema::create('categories', function($table) {   
    $table->engine = 'InnoDB';
    $table->increments('id')->unsigned();
    $table->integer('user_id')->unsigned();
    $table->string('title');
    $table->string('slug');
    $table->text('description');
    $table->timestamps();
});

Course Model

public function category()
{
    return $this->hasOne('Category', 'id');
}

Category Model

public function courses() {
    return $this->hasMany('Course', 'id');
}

Course Controller

public function getIndex()
{
    $categories = Category::all();
    $courses = Course::all();
    return View::make('site/eap/course/index', compact('categories', 'courses'));
}

Course Index View

@foreach($categories as $category)
<h3>{{ $category->title }}</h3>
    @foreach($courses as $course)
    <h4><a href="{{{ $course->url() }}}">{{ $course->title }}</a></h4>
    <p>{{ $course->content }}</p>
    @endforeach
@endforeach

This obviously returns all the courses under each category when I only want the courses of the corresponding category.

I tried everything possible but I think I'm missing the obvious. Where am I supposed to do the loop and where do I do it? In the controller, in the view, in both? How do we glue this together?

Answer 1

Your course doesn't have a categoy, it belongs to one:

public function category ()
{
    return $this->belongsTo('Category');
}

and then in your controller:

$categories = Category::with('courses')->get();

and in your view:

@foreach($categories as $category)

    <h3>{{ $category->title }}</h3>

    @foreach($category->courses as $course)

        <h4><a href="{{ $course->url() }}">{{ $course->title }}</a></h4>
        <p>{{ $course->content }}</p>

    @endforeach

@endforeach