如何从包含数据库行的Ruby变量中查找唯一行

Question

I have these line of code in Ruby:

connection = ActiveRecord::Base.connection()
@mastertest = connection.execute("select code_ver, suite, date from mastertest order by date desc limit 30")

So mastertest contains all the rows from my database table.

I want only all rows which have a unique value of code_ver from the results. How do I find that ?

Answer 1

您可以尝试以下方法：

@mastertest = connection.execute("select distinct code_ver, suite, date from mastertest where code_ver = "#{@variable}")