小编don*_*ski的帖子

我正在尝试使用地理编码器宝石来查找地址和坐标.我希望它与我的PostGIS空间数据库和RGeo gem一起使用,它使用POINT功能而不是分别保存纬度和经度值.所以我尝试使用我的模型将地理编码器查找的结果保存到RGeo POINT功能中:

class Location < ActiveRecord::Base
  attr_accessible :latlon, :name, :address
  set_rgeo_factory_for_column(:latlon, RGeo::Geographic.spherical_factory(:srid => 4326))

  geocoded_by :name_and_address do |obj, results|
    if geo = results.first
      obj.latlon = Location.rgeo_factory_for_column(:latlon).point(geo.longitude, geo.latitude)
    end
  end

  after_initialize :init
  after_validation :geocode


  def init
    self.latlon ||= Location.rgeo_factory_for_column(:latlon).point(0, 0)
  end

  def latitude
    self.latlon.lat
  end

  def latitude=(value)
    lon = self.latlon.lon
    self.latlon = Location.rgeo_factory_for_column(:latlon).point(lon, value)
  end

  def longitude
    self.latlon.lon
  end

  def longitude=(value)
    lat = self.latlon.lat
    self.latlon = Location.rgeo_factory_for_column(:latlon).point(value, lat)
  end

  def name_and_address
    "#{self.name}, #{self.address}"
  end

end

在Rails控制台中,我现在可以:

test = Location.new(name: "Eiffel …

RGeo为POINT特征提供内置方法,例如getter方法lat()以及lon()从POINT对象中提取纬度和经度值.不幸的是,这些不适合作为制定者.例如:

point = RGeo::Geographic.spherical_factory(:srid => 4326).point(3,5)     // => #<RGeo::Geographic::SphericalPointImpl:0x817e521c "POINT (3.0 5.0)">

我可以做这个:

point.lat      // => 5.0
point.lon      // => 3.0

但我做不到:

point.lat = 4    // => NoMethodError: undefined method `lat=' for #<RGeo::Geographic::SphericalPointImpl:0x00000104024770>

有关如何实现setter方法的任何建议？你会在模型中扩展还是扩展Feature类？