How to update a pivot table using Eloquent in laravel 5 - mysql

Question

I am new to laravel. I am working on a laravel 5 app and I am stuck here. I have 2 models as such:
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');
}
}
There exist a many-to-many relationship between Message and User giving me a pivot table as such:
Table Name: message_user
Colums:
message_id
user_id
status
I have an SQL query as such:
update message_user
set status = 1
where user_id = 4 and message_id in (select id from messages where message_id = 123)
How can I translate this query to the laravel equivalent?

Answer 1

The code below solved my problem:
$messages = Message::where('message_id', $id)->get();
foreach($messages as $message)
$message->users()->updateExistingPivot($user, array('status' => 1), false);

Answer 2

You may use one of these two functions, sync() attach() and the difference in a nutshell is that Sync will get array as its first argument and sync it with pivot table (remove and add the passed keys in your array) which means if you got 3,2,1 as valued within your junction table, and passed sync with values of, 3,4,2, sync automatically will remove value 1 and add the value 4 for you. where Attach will take single ID value
The GIST: if you want to add extra values to your junction table, pass it as the second argument to sync() like so:
$message = Messages::find(123);
$user = User::find(4);
// using attach() for single message
$user->message()->attach($message->id, [
'status' => 1
]);
$message2 = Messages::find(456); // for testing
// using sync() for multiple messages
$user->message()->sync([
$message->id => [
'status' => 1
],
$message2->id => [
'status' => 1
],
]);

Answer 3

Here is a small example of how to update the pivot table column
$query = Classes::query();
$query = $query->with('trainees')
->where('user_id', Auth::id())
->find($input['classId']);
foreach ($query->trainees as $trainee) {
$trainee->pivot->status = 1 //your column;
$trainee->pivot->save();
}
Note: make sure your relation data must in an array
Hope its help you :)
happy coding

Answer 4

Laravel 5.8
First, allow your pivot columns to be searchable by chaining the withPivot method to your belongsToMany
Copied from my own code to save time
// 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
The caveat is that your pivot table needs to have a primary 'id' key.
If you don't want that then you can try the following:
$tasks=$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
4th July Update Update to above snippet.
//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
This will work for pivot table which doesn't have a primary auto increment id. without a auto increment id, user cannot update,insert,delete any row in the pivot table by accessing it directly.

Answer 5

For Updating your pivot table you can use updateExistingPivot method.