Converting snake case to normal sentence in Ruby

Question

I'm trying to convert a string in snake case to normal case(Eg: "hello_world" to "Hello world")

I'm pretty new to ruby, and I'm using it with Rails. I found this question Converting string from snake_case to CamelCase in Ruby, and it seems like there is a function for that usecase (.camelize). Is there anything that I can use inbuilt like that? If not, how can I achieve this?

did you also look at this answer? https://stackoverflow.com/a/11411200/8340945 — Diana, May 21 '19 at 13:50
Looks like it can be modded to the purpose, but I prefer something more precise. — Dani Vijay, May 21 '19 at 13:53

score 17 · Accepted Answer · answered May 21 '19 at 17:26

17

humanize is your thing:

[4] pry(main)> "hello_world".humanize
"Hello world"

answered May 21 '19 at 17:26

CAmador

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This requires Rails. – Sash Jul 26 '20 at 13:46

score 12 · Answer 2 · answered May 21 '19 at 15:46

12

Rails has a method called titleize

"hello_world".titleize # => "Hello World"

Ruby has a method called capitalize

"hello_world".capitalize # => "Hello_world"

If you want "Hello world" with only the "H" capitalized, combine them both (in Rails).

"hello_world".titleize.capitalize # => "Hello world"

answered May 21 '19 at 15:46

Cruz Nunez

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This isn't working for me. When I do `> "hello_world".titleize` I get `"Hello_world"` with Rails 5.2. However `.humanize` does the trick (see below). – lucas Nov 16 '21 at 22:02

score 4 · Answer 3 · answered May 21 '19 at 13:51

4

"hello_world".capitalize.gsub("_"," ")
=> "Hello world"

answered May 21 '19 at 13:51

Max Williams

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score 1 · Answer 4 · answered May 21 '19 at 13:50

1

Rails 5 brought in a new upcase_first method: https://glaucocustodio.github.io/2016/05/19/rails-5-new-upcase-first-method/

Combine this with subbing all underscores with spaces and you should be good:

text = 'hello_world'

text.upcase_first.gsub('_', ' ')
=> 'Hello world'

answered May 21 '19 at 13:50

Mark

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shouldn't it be like this for camel case? text.upcase_first.gsub('_', '') – Diana May 21 '19 at 13:51

Converting snake case to normal sentence in Ruby

4 Answers4