我正在使用Laravel 5.1
。
我有两个表users
和medicines
,many-to-many
关系。相关的models
如下:
class User extends BaseModel {
use SoftDeletes;
protected $dates = ['deleted_at'];
protected $table = 'users';
public function medicines(){
return $this->belongsToMany('App\Models\Medicine')->withPivot('id', 'time','config' ,'start','end' );
}
}
和
class Medicine extends BaseModel{
use SoftDeletes;
protected $dates = ['deleted_at'];
protected $table = 'medicines';
public function users(){
return $this->belongsToMany('App\Models\User')->withPivot('id', 'time','config' ,'start','end' );
}
}
many-to-many
关系表user_medicine
有一些额外的pivot columns
,如下所示:
id(PK) user_id(FK users) medicine_id(FK medicines) time config start end
1 1 41 09:00 {dispense:2} 2015-12-01 2015-12-25
2 1 43 10:00 {dispense:1} 2015-12-10 2015-12-22
3 1 44 17:00 NULL 2015-12-10 2015-12-31
现在,我想改变特定药物的时间。我的代码如下:
public function updateMedicationTime($fields){
$result = array();
try {
$user = User::find($fields['user_id']);
$medicines = $user->medicines()->where('medicines.id',$fields['medicine_id'])->first();
if (!empty($medicines)){
$medicine_times = json_decode($medicines->pivot->time);
foreach ($medicine_times as $key=>$medicine_time ){
if ($medicine_time->time == $fields['oldtime']){
$medicine_time->time = $fields['newtime'];
}
}
// Update the time column of provided medicine id
$user->medicines()->where('medicines.id',$fields['medicine_id'])->sync(array($medicines->id , array("time"=>json_encode($medicine_times))), false);
// I also have tried
// $medicines->sync(array($medicines->id , array("time"=>json_encode($medicine_times))), false); OR
// $medicines->pivot->sync(array($medicines->id , array("time"=>json_encode($medicine_times))), false);
}
}
catch(Exception $e ){
throw $e;
}
return $result;
}
但不是updating
现有many-to-many
表格的时间列,而是inserting
新的记录,其中包含id = 1
和{{1}的药物time
其他列。任何人都可以建议我在哪里犯错误?
答案 0 :(得分:6)
您可以使用名为updateExistingPivot
的方法:
$user = User::find($id);
$user->medicines()->updateExistingPivot($medicine_id, ['time' => $time], false);
最后一个参数指定父表是否应该被触及",这意味着更新updated_at
字段的时间戳。