無法訪問postgis的方法

Question

我嘗試使用postgis構建我的rails env。以下是我分貝的擴展名：

         List of installed extensions 
     Name  | Version | Schema |        Description        
------------------+---------+------------+--------------------------------------------------------------------- 

plpgsql   | 1.0  | pg_catalog | PL/pgSQL procedural language 

postgis   | 2.1.3 | public  | PostGIS geometry, geography, and raster spatial types and functions 

postgis_topology | 2.1.3 | topology | PostGIS topology spatial types and functions 
(3 rows) 

我還可以看到 「t.spatial 」位置「，限制：{：SRID => 0，：類型=>」 幾何 「}」 在我schema.rb添加列並遷移數據庫後。

雖然在控制檯和RB文件，我無法訪問像PostGIS的方法：

> e.location = ST_GeomFromText('POINT(121.04238 24.777656)', 4326) 
NoMethodError: undefined method `ST_GeomFromText' for main:Object 
    from (irb):2 
    from /usr/local/rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/console.rb:90:in `start' 
    from /usr/local/rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/console.rb:9:in `start' 
    from /usr/local/rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:69:in `console' 
    from /usr/local/rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:40:in `run_command!' 
    from /usr/local/rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands.rb:17:in `<top (required)>' 

或者在ruby文件：

@data.location = ST_GeomFromText('POINT(' + params[:longitude] +' ' + params[:latitude] + ')', 4326) 

得到服務器錯誤：

NoMethodError (undefined method `ST_GeomFromText' for #<DataController:0x000000053ee388>): 

我嘗試了一些來自互聯網的想法，但無法弄清楚。

Answer 1

PostGIS的方法應該用於SQL，而不是Ruby代碼。見examples in the official document