public function hasMany(string $alias, string $entity): Relation {
    return $this->has_many[$entity] = new Relation($alias, $this->full_name, $entity);
  }
public function hasMany(string $alias, string $entity): Relation {
    return $this->has_many[$entity] = new Relation($alias, $this->full_name, $entity);
  }
public function hasMany ( string $ alias , string $ entity ) : Relation { return $ this -> has_many [ $ entity ] = new Relation ( $ alias , $ this -> full_name , $ entity ) ; }
Add a `has many` relationship

@param  string  $alias   The name of the local column
@param  string  $entity  The fully-qualified class name of the related `Entity`

@return  Relation  Options for the relation
Add a has many relationship