获取相邻区域

-[ ] 获取相邻都道府县 -[x] 获取相邻市区町村 -[ ] 获取相邻街名

数据来源

https://www.stat.go.jp/data/mesh/m_itiran.html

示例

let city = City::find_by_id(13101).unwrap();

println!("{:?}",city.relation_city_id);
// [13103, 13104, 13105, 13102, 13106]
println!("{:?}",city.relation_city_name
// ["港区", "新宿区", "文京区", "中央区", "台東区"]