bootstrap-vue not passing array in checkbox - laravel-5

Question

I'm using bootstrap-vue in my laravel project to pass data from the view to the database with checkboxes (b-form-checkbox), i want to select from the permissions passed from the database and assign it to a role, which means a role can have more than one permission, unfortunately the data is not persisting to the database as an array because if i select more than one in the checkbox it only shows the first one clicked. Please i need help as i have spent too much time on this issue. This is my code:
edit.blade.php
#extends('layouts.master')
#section('content')
<!-- Content Header (Page header) -->
<section class="content-header">
<h1>
Admin
<small>Edit</small>
</h1>
<ol class="breadcrumb">
<li><i class="fa fa-dashboard"></i> Home</li>
<li>Role</li>
<li class="active">Edit</li>
</ol>
</section>
<!-- Main content -->
<section class="content">
#include('layouts.partials.message')
<div class="row">
<div class="col-xs-12">
<div class="box">
<div class="box-header with-border">
<h3 class="boxtitle">Edit Role</h3>
</div>
<!-- /.box-header -->
<div class="box-body">
<form action="{{ route('role.update', ['id' => $role->id]) }}" enctype="multipart/form-data" method="post" accept-charset="utf-8">
{{csrf_field()}}
<div class="row">
<div class="col-md-12">
<div class="form-group">
<input type="text" name="display_name" value="{{ old('display_name', $role->display_name) }}" class="form-control" placeholder="Name (Human Readable)" required>
<span class="help-block text-red">
#if($errors->has('display_name'))
{{ $errors->first('display_name')}}
#endif
</span>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div class="form-group">
<input type="text" name="name" value="{{ old('name', $role->name) }}" class="form-control" placeholder="Slug (can not be edited)" disabled>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div class="form-group">
<input type="text" name="description" value="{{ old('description', $role->description) }}" class="form-control" placeholder="Role Description">
</div>
</div>
</div>
<div class="row">
<div class="col-md-6">
<h2>Permissions:</h2>
<b-form-group>
<b-form-checkbox-group v-model="permissionsSelected">
#foreach ($permissions as $permission)
<div class="form-group">
<b-form-checkbox id="permissions" name="permissions" value="{{ $permission->id }}">
<div class="form-group">
{{ $permission->display_name }} <em> ({{ $permission->description }})</em>
</div>
</b-form-checkbox>
</div>
#endforeach
</div>
</div>
<hr>
<div class="row">
<div class="col-md-1">
<div class="form-group">
<button class="btn btn-primary" type="submit" id="submit">
<i class="fa fa-check"></i> Submit
</button>
<input type="hidden" name="_token" value="{{ csrf_token() }}">
</div>
</div>
<div class="col-md-11">
<div class="form-group">
<div class="checkbox">
<label>
<input name="redirect" type="checkbox" checked> Redirect to role list after submission
</label>
</div>
</div>
</div>
</div>
<div class="clearfix"></div>
</form>
</div>
</div>
</div>
</div>
</section>
#endsection
#section('vue')
<script>
var app = new Vue ({
el: '#app',
data: {
permissionsSelected: {!!$role->permissions->pluck('id')!!}
}
});
</script>
#endsection