无法使用PostGIS/RGeo保存多边形

Question

如何使用适用于Rails的PostGIS适配器保存多边形？在我的模型中,我有:

self.rgeo_factory_generator = RGeo::Geos.factory_generator
set_rgeo_factory_for_column(:bounds, RGeo::Geographic.spherical_factory(:srid => 4326))

但是当我尝试将多边形保存到数据库时,它不会引发任何错误,但始终无法存储多边形:

1.9.3p194 :011 > n.bounds = "POLYGON(-149.737965876574 61.1952881991104, -149.71848377896 61.1953198415937, -149.718483761252 61.1952938698801, -149.718483872402 61.1951924591105)"
 => "POLYGON(-149.737965876574 61.1952881991104, -149.71848377896 61.1953198415937, -149.718483761252 61.1952938698801, -149.718483872402 61.1951924591105)" 
1.9.3p194 :012 > n.save
   (0.2ms)  BEGIN
   (0.3ms)  COMMIT
 => true 
1.9.3p194 :013 > n.bounds
 => nil 

我怎样才能让它发挥作用？

Answer 1

它是无效的WKT,无法解析有两个原因:

1. 没有戒指.您需要在坐标数组周围添加另一组括号.
2. 戒指未关闭.重复起点作为终点.

这就是有效的WKT应该是这样的:

POLYGON((-149.737965876574 61.1952881991104, -149.71848377896 61.1953198415937, -149.718483761252 61.1952938698801, -149.718483872402 61.1951924591105, -149.737965876574 61.1952881991104))