Laravel Eloquent のための重要な実践的なヒント

$article = Article::find($article_id); $article->read_count++; $article->save();

$article = Article::find($article_id); $article->increment('read_count');

Article::find($article_id)->increment('read_count'); Article::find($article_id)->increment('read_count', 10); // +10 Product::find($produce_id)->decrement('stock'); // -1

$user = User::find($id); if (!$user) { abort (404); }

$user = User::findOrFail($id);

$user = User::where('email', $email)->first(); if (!$user) { User::create([ 'email' => $email ]); }

$user = User::firstOrCreate(['email' => $email]);

class User extends Model { public static function boot() { parent::boot(); static::updating(function($model) { // 写点日志啥的 // 覆盖一些属性，类似这样 $model->something = transform($something); }); } }

public static function boot() { parent::boot(); self::creating(function ($model) { $model->uuid = (string)Uuid::generate(); }); }

public function users() { return $this->hasMany('App\User'); }

public function approvedUsers() { return $this->hasMany('App\User')->where('approved', 1)->orderBy('email'); }

class User extends Model { protected $table = 'users'; protected $fillable = ['email', 'password']; // 可以被批量赋值字段，如 User::create() 新增时，可使用字段 protected $dates = ['created_at', 'deleted_at']; // 需要被Carbon维护的字段名 protected $appends = ['field1', 'field2']; // json返回时，附加的字段 }

protected $primaryKey = 'uuid'; // 更换主键 public $incrementing = false; // 设置 不自增长 protected $perPage = 25; // 定义分页每页显示数量（默认15） const CREATED_AT = 'created_at'; const UPDATED_AT = 'updated_at'; //重写 时间字段名 public $timestamps = false; // 设置不需要维护时间字段

$user = User::find(1);

$users = User::find([1,2,3]);

$users = User::where('approved', 1)->get();

$users = User::whereApproved(1)->get();

User::whereDate('created_at', date('Y-m-d')); User::whereDay('created_at', date('d')); User::whereMonth('created_at', date('m')); User::whereYear('created_at', date('Y'));

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

$users = Topic::with('latestPost')->get()->sortByDesc('latestPost.created_at');

if (request('filter_by') == 'likes') { $query->where('likes', '>', request('likes_amount', 0)); } if (request('filter_by') == 'date') { $query->orderBy('created_at', request('ordering_rule', 'desc')); }

$query = Author::query(); $query->when(request('filter_by') == 'likes', function ($q) { return $q->where('likes', '>', request('likes_amount', 0)); }); $query->when(request('filter_by') == 'date', function ($q) { return $q->orderBy('created_at', request('ordering_rule', 'desc')); });

$query = User::query(); $query->when(request('role', false), function ($q, $role) { return $q->where('role_id', $role); }); $authors = $query->get();

{{ $post->author->name }}

{{ $post->author->name ?? '' }}

public function author() { return $this->belongsTo('App\Author')->withDefault(); }

public function author() { return $this->belongsTo('App\Author')->withDefault([ 'name' => 'Guest Author' ]); }

function getFullNameAttribute() { return $this->attributes['first_name'] . ' ' . $this->attributes['last_name']; }

$clients = Client::orderBy('full_name')->get(); //没有效果

$clients = Client::get()->sortBy('full_name'); // 成功!

protected static function boot() { parent::boot(); // 按照 name 正序排序 static::addGlobalScope('order', function (Builder $builder) { $builder->orderBy('name', 'asc'); }); }

// whereRaw $orders = DB::table('orders') ->whereRaw('price > IF(state = "TX", ?, 100)', [200]) ->get(); // havingRaw Product::groupBy('category_id')->havingRaw('COUNT(*) > 1')->get(); // orderByRaw User::where('created_at', '>', '2016-01-01') ->orderByRaw('(updated_at - created_at) desc') ->get();

$task = Tasks::find(1); $newTask = $task->replicate(); $newTask->save();

$users = User::all(); foreach ($users as $user) { // ...

User::chunk(100, function ($users) { foreach ($users as $user) { // ... } });

php artisan make:model Company

php artisan make:model Company -mcr

$product = Product::find($id); $product->updated_at = '2019-01-01 10:00:00'; $product->save(['timestamps' => false]);

$result = $products->whereNull('category_id')->update(['category_id' => 2]);

... WHERE (gender = 'Male' and age >= 18) or (gender = 'Female' and age >= 65)

$q->where('gender', 'Male'); $q->orWhere('age', '>=', 18); $q->where('gender', 'Female'); $q->orWhere('age', '>=', 65);

$q->where(function ($query) { $query->where('gender', 'Male') ->where('age', '>=', 18); })->orWhere(function($query) { $query->where('gender', 'Female') ->where('age', '>=', 65); })

$q->where('a', 1); $q->orWhere('b', 2); $q->orWhere('c', 3);

$q->where('a', 1); $q->orWhere(['b' => 2, 'c' => 3]);