[英]Laravel Eager Loading, multiple same hasOne relations
I have 2 simple models. 我有2个简单的模型。 First, one is called Builds and the second one is called SlotOptions.
首先,一个叫做Builds,第二个叫做SlotOptions。 Each build can have like 5 assigned slots.
每个版本可以分配5个插槽。
class BuildDB extends Model
And has 5 such relations slot1-5 and id changes to slot1-5_id
并且有5个这样的关系
slot1-5 and id changes to slot1-5_id
public function slot1()
{
return $this->hasOne('\App\SlotOptions', 'id', 'slot1_id');
}
In the controller I call it such way; 在控制器中,我这样称呼它。
BuildDB::with([ 'slot1', 'slot2', 'slot3', 'slot4', 'slot5'])->find(5);
\\App\\SlotOptions
model doesn't contain any extra coding. \\App\\SlotOptions
模型不包含任何额外的编码。
This generates 5 "same" queries. 这将生成5个“相同”查询。 - atm the eager loading would work if I get a list of builds and each slot would have whereIn clause, is it possible to have it a one big
wherein
the clause, or does it require to change the DB schema. -atm急切的加载将在我获得构建列表的情况下起作用,并且每个插槽都具有whereIn子句,是否可以将
wherein
一个大的where子句放在wherein
,或者是否需要更改数据库架构。
It's not possible to optimize eager loading in this case. 在这种情况下,不可能优化紧急加载。
I recommend that you change your database schema to a many-to-many relationship . 我建议您将数据库架构更改为多对多关系 。
This design is more flexible, it allows you to easily add more slots in the future. 这种设计更加灵活,它使您将来可以轻松添加更多插槽。
Create a pivot table named build_slot_option
with these columns: build_id
, slot_option_id
使用以
build_slot_option
创建名为build_slot_option
的数据透视表: build_id
, slot_option_id
Add an additional column if you want to number/order the slots. 如果要编号/排序插槽,请添加其他列。
Then define a BelongsToMany
relationship: 然后定义一个
BelongsToMany
关系:
class BuildDB extends Model
{
public function slots()
{
return $this->belongsToMany(
SlotOptions::class, 'build_slot_option', 'build_id', 'slot_option_id'
);
}
}
BuildDB::with('slots')->find(5);
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