Answers for "has many with many eloquent"

laravel has many

public function comments()
 {
   return $this->hasMany(Comment::class);
 }

laravel has many through relationship

projects
    id - integer
    name - string

environments
    id - integer
    project_id - integer
    name - string

deployments
    id - integer
    environment_id - integer
    commit_hash - string