How to Assign Additional Pivot Table Values in Laravel when Syncing an Array?

Syncing an Array with Additional Pivot Fields in Laravel

The Laravel sync() method allows you to synchronize a model's relationship with an array of related IDs. But what if you need to associate additional pivot table values with these IDs?

Assigning Pivot Values for Multiple Models

The documentation example only shows how to assign pivot values for a single model. To assign values for multiple models, use the following syntax:

<code class="php">$user->roles()->sync([
    1 => ['expires' => true],
    2 => ['expires' => false],
    ...
]);</code>

This syntax allows you to specify pivot values for each related model using the array key-value pairs.

Example with Dynamic Pivot Values

Consider a scenario where you're handling form input to assign speakers to an event. The input is an array of speaker IDs and you need to set the is_speaker column in the pivot table to true.

Here's how you can achieve this:

<code class="php">$speakers = (array) Input::get('speakers'); // related ids
$pivotData = array_fill(0, count($speakers), ['is_speaker' => true]);
$syncData = array_combine($speakers, $pivotData);

$user->roles()->sync($syncData);</code>

By using array_fill() and array_combine(), you can create an array of pivot values with the desired key-value pairs and then sync them with the model's relationship.

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