[英]Sorting and searching a single table inheritance structure with Eloquent
I've implemented single table inheritance using Eloquent models and now I want to be able to sort and search the database based on the parent model and the child model. 我已经使用Eloquent模型实现了单表继承,现在我希望能够基于父模型和子模型对数据库进行排序和搜索。 I've used polymorphic relations to accomplish this.
我使用多态关系来完成此任务。
The base model only has the morphing method. 基本模型仅具有变形方法。
class Item extends Model
{
public function extended()
{
return $this->morphTo();
}
}
All models that extends the item has some basic properties 所有扩展项目的模型都具有一些基本属性
abstract class ExtendedItem extends Model
{
/**
* The relationships to always load with the model
*
* @var array
*/
protected $with = ['item'];
/**
* The accessors to append to the model's array form.
*
* @var array
*/
protected $appends = ['title'];
/**
* The attributes that should be hidden for arrays.
*
* @var array
*/
protected $hidden = ['item'];
public function getTitleAttribute()
{
return $this->item->title;
}
public function item()
{
return $this->morphOne('App\Item', 'extended');
}
}
Example child classes 子类示例
class Foo extends ExtendedItem
{
public function bars()
{
return $this->hasMany('App\Bar')->orderBy('bar_col1')->orderBy('bar_col2');
}
}
class Bar extends ExtendedItem
{
public function foo()
{
return $this->belongsTo('App\Foo');
}
}
If I want to list all the items I use $items = Item::with('extended')->get();
如果要列出所有项目,请使用
$items = Item::with('extended')->get();
and if I only want the Foo objects I use $foos = Foo::all();
如果我只想要Foo对象,则使用
$foos = Foo::all();
. 。
I can order a list of all items using 我可以使用以下命令订购所有物品的清单
$items = return Item::with('extended')->orderBy('title')->get();
but how can I order a list of foos by title? 但是如何按标题排序foos列表? How can I search foos by title?
如何按标题搜索foos? Preferably this would be done on the database with a generated query and not done on an Eloquent collection.
最好是使用生成的查询在数据库上完成,而不是在Eloquent集合上完成。
If following the default database structure for polymorphic relations in Laravel, I believe you can use whereHas to limit your results to only foo instances. 如果遵循Laravel中默认的多态关系数据库结构,我相信您可以使用whereHas将结果限制为仅foo实例。
I don't have access to a machine to test right now, but this is what I would try: 我目前无法使用机器进行测试,但这是我会尝试的方法:
$items = Item::whereHas('extended' => function ($q) {
$q->where('extended_type', 'foo');
})->with('extended')->orderBy('title')->get();
To sort the related table, the table must first be joined. 要对相关表进行排序,必须首先将表连接在一起。
return Foo::with('item')
->join('items', 'items.extended_id', '=', 'foos.id')
->orderBy('title', 'DESC')
->get();
Searching can be done using whereHas
可以使用
whereHas
进行搜索
return Foo::whereHas('item', function ($q) {
$q->where('title', 'LIKE', '%baz%');
})->get();
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