show last post from each category

Question

I have two models Post and Category

// migration post

public function up()
{
    Schema::create(\'posts\', function (Blueprint $table) {
        $ta         


        

Answer 1

Hiren was close, but you need to go from the category since your post is owned by the category

$category->posts()->latest()->first();

Alternatively you could work backwards:

$post = Post::latest()->whereHas('category', function($q) use($category_id) {
    return $q->where('id', $category_id);
})->first();

For this to work you'll need to define your model relationships:

Category Model needs this function:

public function posts() 
{
    return $this->hasMany(App\Post::class);
}

Post Model needs this function:

public function category()
{
    return $this->belongsTo(App\Category::class);
}

To respond to Alexey Mezenin, we can just pass a callback to with() to define which posts we want to pull in for each category, performing the correct eager load.

Category::with(['posts' => function($q) {
    return $q->latest()->first();
})->get(); 

Answer 2

An Eloquent solution for loading categories with latest post is to create an additional hasOne() relationship in the Category model:

public function latestPost()
{
    return $this->hasOne(Post::class)->latest();
}

And then use eager loading:

Category::with('latestPost')->get();

This will generate just 2 queries to DB.

Answer 3

public function up()
{
    Schema::create('news', function (Blueprint $table) {
        $table->increments('id');
        $table->string('slug')->unique();
        $table->unsignedInteger('author_id');
        $table->unsignedInteger('category_id');
        $table->string('subject');
        $table->text('short');
        $table->text('content');
        $table->integer('view')->default(0);
        $table->integer('status')->default(0);
        $table->string('image');
        $table->timestamps();

        $table->foreign('author_id')
              ->references('id')->on('users')
              ->onDelete('cascade');
        // $table->foreign('category_id')
        //       ->references('id')->on('categories')
        //       ->onDelete('cascade');
    });
    // Schema::enableForeignKeyConstraints();
}
public function up()
{
    Schema::create('categories', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name')->unique();
        $table->timestamps();
    });
}

in contoller:

    $latestpostlist = News::whereIn('created_at',function($query){
            $query->select(DB::raw('max(created_at)'))
                      ->from('news')
                      ->groupBy('category_id');
    })->get();

in your case news will be post. this query worked for me