Storing Select Query result in Variable Ruby on Rails

Question

I wanted to know how we could store the result of my select query on a variable.

@ppt2 = Ppt.select('slide_name').where('id=?',4)
@ppt1 = Ppt.update_all({:time2=>@ppt2},['id like ?','1'])

Here, slide_name and time2 are both text attributes of the same table ppt .

What happens on the above execution is that the time2 field in id=1 gets the value " @ppt2 " whereas I want it to get the value of slide_name from id=4 which does not get stored in @ppt1 .

In other words, how do I store the value of the select query in @ppt2 so that it can be used in the next line?

Any help is appreciated.

Answer 1

在第一个结果上调用slide_name方法。

@ppt2 = Ppt.select('slide_name').find(4).slide_name