Question

我正在执行一个计算两个gps点之间距离的任务，我想将该距离转换为KM：

def distances
    site     = Site.find params[ :id ]
    stores   = Store.current
    distances = []

    stores.map do |store|
      distance = Haversine.distance(site.address.latitude, site.address.longitude, store.address.latitude, store.address.longitude)
      distances << {
        name: store.name,
        value: distance
      }
    end

    render json: {
      distances: distances.to_json
    }

  end

计算项目示例：

store2：5527.654499076738

在haversine gem的文档中，有一种转换方法：distance.to_kilometers，但对我不起作用！有帮助吗？

Answer 1

您可能需要在生成的to_kilometers上调用Haversine::Distance方法，否则将使用其to_s方法：

def distances
  site = Site.find params[ :id ]

  distances = Store.current.map do |store|
    {
      name: store.name,
      value: Haversine.distance(
               site.address.latitude,
               site.address.longitude,
               store.address.latitude,
               store.address.longitude
             ).to_kilometers
    }
  end

  render json: {
    distances: distances
  }
end

您真正想要做的是在您的distance_in_km类中添加一个Address ...

Ruby on rails Haversine gem：将计算出的距离转换为km

1 个答案: