Interpolation of user input strings in Ruby

Question

I can't strongly formulate what I need now, but the idea is this:

User inputs some string that looks like a template

'Welcome to #{country}!' # or 'Welcome to %%country%%!', it's not essential

Is there some gem (or may be standard tool like Erb), that could do 2 things:

Validate given string (i.e. if I allow to pass only country as parameter, strings with another parameters will not be valid)
Interpolate given string with passed parameters (i.e. some_method('Welcome to #{country}!', country: 'Russia')) # => 'Welcome to Russia!')

sawa · Accepted Answer · 2013-03-12 19:44:56Z

9

"Welcome to %{country}!" % {country: "Russia"}
# => "Welcome to Russia!"

"Welcome to %{country}!" % {person: "John"}
# => KeyError: key{country} not found

answered Mar 12, 2013 at 19:44

sawa

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1 Comment

Arup Rakshit Over a year ago

I have never seen such code :). interesting one. what that % is called?

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