LazyRecord\Schema\DeclareColumn::refer PHP Метод

    public function refer($schemaClass)
    {
        if (!preg_match('/Schema$/', $schemaClass)) {
            $schemaClass = "{$schemaClass}Schema";
        }
        // try classes
        if (!class_exists($schemaClass, true)) {
            $schemaClass = $this->schema->getNamespace() . '\\' . $schemaClass;
        }
        if (!class_exists($schemaClass, true)) {
            throw new SchemaRelatedException($this->schema, "Can't find referred schema class '{$schemaClass}'.");
        }
        $this->attributes['refer'] = $schemaClass;
        // get the primary key from the refered schema
        if (get_class($this->schema) === ltrim($schemaClass, '\\')) {
            $schema = $this->schema;
        } else {
            $schema = new $schemaClass();
        }
        if ($primaryKey = $schema->findPrimaryKeyColumn()) {
            $this->applyType($primaryKey);
        }
        return $this;
    }