Laravel Eloquent:用于关系的多个外键 [英] Laravel Eloquent: multiple foreign keys for relationship
问题描述
我正在将项目移植到Laravel.
我有两个彼此一对一关系的数据库表.它们通过三个条件结合在一起.如何在Eloquent中建立这种关系的模型?
我不应该修改数据库架构,因为它必须与其他事物保持向后兼容.
我已经尝试了以下方法,但是不起作用.
拥有方:
use Illuminate\Database\Eloquent\Model;
class Route extends Model
{
public function trips()
{
return $this->hasMany('Trip', 'route_name,source_file', 'route_name,source_file')
}
}
反面:
use Illuminate\Database\Eloquent\Model;
class Trip extends Model
{
public function routes()
{
return $this->belongsTo('Route', 'route_name,source_file', 'route_name,source_file');
}
}
示例Route
数据库值:
id | route_name | source_file
---------------------------------------
1 | Berlin - Paris | file1.xls
2 | Madrid - London| file2.xls
3 | Berlin - Paris | file3.xls
示例Trip
数据库值:
id | route_name | source_file | duration
---------------------------------------------------------
1 | Berlin - Paris | file1.xls | 78
2 | Madrid - London | file2.xls | 241
3 | Berlin - Paris | file3.xls | 65
1 | Berlin - Paris | file1.xls | 95
1 | Berlin - Paris | file1.xls | 65
Route
和Trip
具有其他属性,为简洁起见,在此未包括.
这在雄辩中有可能吗?
我不得不处理类似的问题. @fab提供的解决方案无法立即加载,因为在处理关系时, $ this-> source_fil e将为 null .我想出了此解决方案
在安装 Compoships 并在模型中对其进行配置之后,您可以定义与多个列匹配的关系. /p>
拥有方:
use Illuminate\Database\Eloquent\Model;
use Awobaz\Compoships\Compoships;
class Route extends Model
{
use Compoships;
public function trips()
{
return $this->hasMany('Trip', ['id', 'route_name', 'source_file'], ['route_id', 'route_name', 'source_file']);
}
}
反面:
use Illuminate\Database\Eloquent\Model;
use Awobaz\Compoships\Compoships;
class Trip extends Model
{
use Compoships;
public function route()
{
return $this->belongsTo('Route', ['route_id', 'route_name', 'source_file'], ['id', 'route_name', 'source_file']);
}
}
Compoships支持快速加载.
I am in the process of porting a project to Laravel.
I have two database tables which are in a One-To-Many relationship with each other. They are joined by three conditions. How do I model this relationship in Eloquent?
I am not supposed to modify the database schema, since it has to remain backwards compatible with other things.
I have tried the following, but it doesn't work.
The owning side:
use Illuminate\Database\Eloquent\Model;
class Route extends Model
{
public function trips()
{
return $this->hasMany('Trip', 'route_name,source_file', 'route_name,source_file')
}
}
The inverse side:
use Illuminate\Database\Eloquent\Model;
class Trip extends Model
{
public function routes()
{
return $this->belongsTo('Route', 'route_name,source_file', 'route_name,source_file');
}
}
Example Route
database values:
id | route_name | source_file
---------------------------------------
1 | Berlin - Paris | file1.xls
2 | Madrid - London| file2.xls
3 | Berlin - Paris | file3.xls
Example Trip
database values:
id | route_name | source_file | duration
---------------------------------------------------------
1 | Berlin - Paris | file1.xls | 78
2 | Madrid - London | file2.xls | 241
3 | Berlin - Paris | file3.xls | 65
1 | Berlin - Paris | file1.xls | 95
1 | Berlin - Paris | file1.xls | 65
Route
and Trip
have other attributes, which I did not include here for brevity.
Is this possible in Eloquent?
I had to deal with a similar problem. The solution provided by @fab won't work with eager loading because $this->source_file would be null at the time the relationship is processed. I came up with this solution
After installing Compoships and configuring it in your models, you can define your relationships matching multiple columns.
The owning side:
use Illuminate\Database\Eloquent\Model;
use Awobaz\Compoships\Compoships;
class Route extends Model
{
use Compoships;
public function trips()
{
return $this->hasMany('Trip', ['id', 'route_name', 'source_file'], ['route_id', 'route_name', 'source_file']);
}
}
The inverse side:
use Illuminate\Database\Eloquent\Model;
use Awobaz\Compoships\Compoships;
class Trip extends Model
{
use Compoships;
public function route()
{
return $this->belongsTo('Route', ['route_id', 'route_name', 'source_file'], ['id', 'route_name', 'source_file']);
}
}
Compoships supports eager loading.
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