Question

I’m in the console and I have a model called line with a fontsize field.

I want to normalise my font sizes so that fonts between 20-25 are set to 24 and any above are set to 28 and any fonts in the 30s is set to 32.

How do I go about mass updating my database from the console like this?

Answer 1

(I’m reading this as something you only want to do once, so I’ve gone for readability over performance or brevity)

Assuming Rails >3 and that your model is called Line (with a capital “L”), the following should do you:

Line.where(:fontsize => (20..25).each {|x| x.update_attribute :fontsize, 24)
Line.where(:fontsize => (26..29).each {|x| x.update_attribute :fontsize, 28)
Line.where(:fontsize => (30..39).each {|x| x.update_attribute :fontsize, 32)