Question

我有以下查询：

Score.where("build_id => ? AND metric_id => ? ",params[:buildIds], params[:metricIds])

其中params [：buildIds]，params [：metricIds]是整数数组。我收到这个错误：

PG::Error: ERROR:  operator does not exist: integer => integer
LINE 1: SELECT "scores".* FROM "scores"  WHERE (build_id => 1,2 AND ...
                                                         ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT "scores".* FROM "scores"  WHERE (build_id => 1,2 AND metric_id => 1,13 )

任何帮助？

由于

Answer 1

最简单的方法是将两个where调用链接在一起，让ActiveRecord找出所需的SQL：

Score.where(:build_id => params[:buildIds]).where(:metric_id => params[:metricIds])

这将在SQL中为您生成IN，因此数据库应该看到如下内容：

where build_id in (1, 2) and metric_id in (1, 13)

错误消息告诉您PostgreSQL中没有=>运算符，两边都有整数。那是因为=>是Ruby语法，而不是PostgreSQL语法（当然，除非你安装了hstore，而hstore的=>需要两边的字符串）。

活动记录占位符/子集条件

1 个答案: