使用CI活动记录在数据库中动态插入值？

I have function which fetches data from external database and I get specific film information such as id, name, genre etc. Now if movie genre is for example Animation I want only this one genre to be added to db. Now I can solve issue using isset but then I will have db entries for genres null and I want to avoid this. What is best way to approach this problem? Using foreach loop?

$records = array(
    array('film_id' => $movies['id'], 'genre_id' => $movies['genre'][0]),
    array('film_id' => $movies['id'], 'genre_id' => $movies['genre'][1]),
    array('film_id' => $movies['id'], 'genre_id' => $movies['genre'][2])
);

$this->db->insert_batch('film_genre', $records);

You can also use array_filter

$arr = array(

    array("id"=>3, "genre"=>"action"),
    array("id"=>13, "genre"=>"comedy"),
    array("id"=>23, "genre"=>"action"),
    array("id"=>53, "genre"=>"comedy"),
    array("id"=>63, "genre"=>"drama"),
    array("id"=>73, "genre"=>"action"),
    array("id"=>83, "genre"=>"drama"),

);

function genre($var)
{
    if($var['genre'] == 'action')
    {
        return $var;
       // you can also do the insert here like $this->db->insert();
    }
}

$filtered = array_filter($arr, "genre");

print_r($filtered)

You could group your fetched data using Mysql's GROUP BY function