show last post from each category - laravel

Question

I have two models Post and Category
// migration post
public function up()
{
Schema::create('posts', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->string('body');
$table->string('image');
$table->integer('category_id')->unsigned();
$table->foreign('category_id')->references('id')->on('categories');
$table->timestamps();
});
}
// migration category
public function up()
{
Schema::create('categories', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->timestamps();
});
}
How can I display only the last post from each category in home page?

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