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laravel 5でEloquentを使用してピボットテーブルを更新する方法

私はララベルに新しいです。私はlaravel 5アプリに取り組んでおり、ここで立ち往生しています。そのような2つのモデルがあります：

class Message extends Eloquent{

    public function user()
    {
        return $this->belongsTo('App\User', 'from');
    }

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

class User extends Eloquent {

    public function messages()
    {
        return $this->hasMany('App\Message', 'from');
    }

    public function receive_messages() {
        return $this->belongsToMany('App\Message')->withPivot('status');
    }
}

MessageとUserの間には多対多の関係があり、ピボットテーブルを提供しています。

Table Name: message_user
Colums:
message_id
user_id
status

そのようなSQLクエリがあります：

update message_user
set status = 1
where user_id = 4 and message_id in (select id from messages where message_id = 123)

このクエリをlaravel同等のものに変換するにはどうすればよいですか？

mysqllaravellaravel-5eloquent
28
Fokwa Best

以下のコードは私の問題を解決しました：

$messages  = Message::where('message_id', $id)->get();
foreach($messages as $message)
   $message->users()->updateExistingPivot($user, array('status' => 1), false);
25
Fokwa Best

これら2つの関数sync()attach()のいずれかを使用できます。簡単に言うと、Syncは最初の引数として配列を取得し、ピボットテーブルと同期します。 （渡されたキーを削除して配列に追加）つまり、ジャンクションテーブル内で3,2,1の値が取得され、値3,4,2の同期が渡された場合、自動的に同期が削除されます値1と値4を追加します。 Attachが単一のID値を取る場所

The Gist：ジャンクションテーブルに追加の値を追加する場合は、次のようにsync()の2番目の引数として渡します。

$message = Messages::find(123);
$user = User::find(4);

// using ->attach for single message
$user->message()->attach($message->id,['status' => 1 ]);



// using ->sync for multiple messages
$message2 = Messages::find(456); // for testing
$user->message()->sync([$message->id => ['status' => 1 ],$message2->id => ['status' => 1 ] ]);
11
Mohammad Kawsara

Laravel 5.8

まず、withPivotメソッドをbelongsToManyにチェーンして、ピボット列を検索できるようにします。

時間を節約するために自分のコードからコピーした

// I have 3 columns in my Pivot table which I use in a many-to-many and one-to-many-through scenarios

$task = $user->goalobjectives()->where(['goal_objective_id'=>$goal_objective_id,'goal_obj_add_id'=>$goal_obj_add_id])->first(); //get the first record

$task->pivot->goal_objective_id = $new; //change your col to a new value

$task->pivot->save(); //save

注意点は、ピボットテーブルにプライマリ'id'キー。

あなたがそれを望まないなら、あなたは以下を試すことができます：

$tasks=$user->posts()->where(['posts_id'=>$posts_id,'expires'=>true])->get()->pluck('id'); // get a collection of your pivot table data tied to this user

$key=join(",",array_keys($tasks->toArray(),$valueYouWantToRemove));

$tasks->splice($key,1,$newValueYouWantToInsert);

$c = array_fill(0,$tasks->count(),['expires'=>true]); //make an array containing your pivot data

$newArray=$tasks->combine($c) //combine the 2 arrays as keys and values

$user->posts()->sync($newArray); //your pivot table now contains only the values you want

7月4日更新上記のスニペットに更新。

//Ideally, you should do a check see if this user is new
//and if he already has data saved in the junction table
//or are we working with a brand new user

$count = $user->goalobjectives->where('pivot.goal_obj_add_id',$request->record)->count();

//if true, we retrieve all the ids in the junction table 
//where the additional pivot column matches that which we want to update

if($count) {

$ids = $user->goalobjectives->where('pivot.goal_obj_add_id',$request->record)->pluck('id');

//convert to array

$exists = $ids->toArray();

//if user exists and both saved and input data are exactly the same
//there is no need
//to update and we redirect user back

if(array_sum($inputArray) == array_sum($exists)) {

//redirect user back

}

//else we update junction table with a private function
//called 'attachToUser'

$res = $this->attachToUser($user, $inputArray, $ids, $request->record);

}//end if

elseif(!$count) {

//we are working with a new user
//we build an array. The third pivot column must have equal rows as
//user input array

$fill = array_fill(0,count($inputArray),['goal_obj_add_id'=>$request->record]);

//combine third pivot column with user input

$new = array_combine($inputArray,$fill);

//junction table updated with 'user_id','goal_objective_id','goal_obj_add_id'

$res = $user->goalobjectives()->attach($new);

//redirect user if success

}

//our private function which takes care of updating the pivot table

private function attachToUser(User $user, $userData, $storedData, $record) {

//find the saved data which must not be deleted using intersect method

$intersect = $storedData->intersect($userData);

if($intersect->count()) {

//we reject any data from the user input that already exists in the database

$extra = collect($userData)->reject(function($value,$key)use($intersect){

return in_array($value,$intersect->toArray());

});

//merge the old and new data

$merge = $intersect->merge($extra);

//same as above we build a new input array

$recArray = array_fill(0,$merge->count(),['goal_obj_add_id'=>$record]);

//same as above, combine them and form a new array

$new = $merge->combine($recArray);

//our new array now contains old data that was originally saved
//so we must remove old data linked to this user
// and the pivot record to prevent duplicates

$storedArray = $storedData->toArray();

$user->goalobjectives()->wherePivot('goal_obj_add_id',$record)->detach($storedArray);

//this will save the new array without detaching
//other data previously saved by this user

$res = $user->goalobjectives()->wherePivot('goal_obj_add_id',$record)->syncWithoutDetaching($new);

}//end if

//we are not working with a new user
//but input array is totally different from saved data
//meaning its new data

elseif(!$intersect->count()) {

$recArray = array_fill(0,count($userData),['goal_obj_add_id'=>$record]);

$new = $storedData->combine($recArray);

$res = $user->goalobjectives()->wherePivot('goal_obj_add_id',$record)->syncWithoutDetaching($new);

}

//none of the above we return false

return !!$res;

}//end attachToUser function

これは、プライマリ自動インクリメントIDを持たないピボットテーブルで機能します。自動インクリメントIDがない場合、ユーザーはピボットテーブルの行に直接アクセスして更新、挿入、削除することはできません。

1
Bruce Tong

ピボットテーブルを更新するには、updateExistingPivotメソッドを使用できます。

0
Babar Sajjad