Ruby on Rails - 选择日期范围内的记录（性能缓慢）

Question

I know how to find records within a date range, and have seen answers to similar questions. My question is how to reformat my date value from "mm/dd/yy" to a format which can be compared to a date range, all within one query.

I have a column in my database that contains a date in "mm/dd/yy" format. I am trying to write a query that will select all records within a date range defined by start_date and end_date variables, which are Ruby Date objects.

This is the best I have so far, but it's very slow:

date_records = Record.select { |r| ( (r.division == division) && (Date.strptime(r.date, "%m/%d/%y") >= start_date) && (Date.strptime(r.date, "%m/%d/%y") <= end_date) ) }

Answer 1

我发现在执行解析和比较日期的.select之前将我的记录转换为 JSON 极大地提高了性能（~35s 到~4s）：

division_records = Record.where(division: division).as_json date_range_records = division_records.select { |r| ((start_date..end_date).include? Date.strptime(r["date"], "%m/%d/%y")) }