Imagine that you want to truncate a filename, but you want to keep showing the extension of the file. Like “A big file name that…awesome.pdf”. How would you do it?
With the :omission string the last characters will be replaced (defaults to “…”) for a total length not exceeding length:
string = "And they found that many people were sleeping better."
string.truncate(25, omission: '... (continued)')
# => "And they f... (continued)"
So, you can pass as the omssion string, the last characters of your string like this:
filename = "And they found that many people were sleeping better.pdf"
filename.truncate(25, omission: "... #{filename.last(10)}")
# => "And they fo... better.pdf"
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