我遇到了一个奇怪的问题,我创建了一个基于this suggestion的自定义SQL函数。我有一个模型Route
,其控制器操作create
可以在模型上调用此方法
def get_route(startx, starty, endx, endy)
query = "SELECT seq, cost, slope::double precision, designacao::character varying(192), length::double precision," +
"ST_AsGeoJSON(geom) FROM pgr_dijkstra('" +
"SELECT gid AS id," +
"source::integer," +
"target::integer," +
"length AS cost " +
"FROM ways WHERE CAST(classif as int) <> 2'," +
"get_nearest_vertex_to_lon_lat(CAST(#{startx} as float) , CAST(#{starty} as float)), " +
"get_nearest_vertex_to_lon_lat(CAST(#{endx} as float), CAST(#{endy} as float)), false, false) a LEFT JOIN ways b ON (a.id2 = b.gid);"
results = ActiveRecord::Base.connection.execute(query)
return results
end
这适用于开发,但不适用于生产,它提供了一个
PG::UndefinedFunction: ERROR: function get_nearest_vertex_to_lon_lat(double precision, double precision) does not exist
还有
ActiveRecord::StatementInvalid (PG::UndefinedFunction: ERROR: function get_nearest_vertex_to_lon_lat(double precision, double precision) does not exist
奇怪的部分是我在postgres上执行此查询并且它有效。
答案 0 :(得分:0)
事实证明,尽管我的配置database.yml
用于制作,但我并不知道Heroku创建了自己的生产数据库,因此显然不知道任何自定义sql函数,甚至表格。
为了将来参考,如果您要部署到heroku并且您正在使用远程数据库,则必须执行this first,然后设置自己的DATABASE_URL