CODEWITHSUNDEEP
rubyinstance-variables
B Seven
B Seven

Reputation: 45943

How to create a variable name from the value of a string in Ruby on Rails?

I want to create an instance variable in a controller to be used in the view:

foo = "bar"
instance_variable_set("#{foo}", "cornholio")

In the view, use @bar so that:

@bar => "cornholio"

This generates an error: 'bar' is not allowed as an instance variable name

Working in Rails 3.1

Upvotes: 30

Views: 15568

Answers (3)

D4v1dW3bb
D4v1dW3bb

Reputation: 68

I was looking for the answer for the same question but with an other thought. Because other people might ending up here looking for my answer here my question and solution:

I want to cal t(key, interpolation_var: value) in a method. where interpolation _var: is different per translation. solution(I have removed all non important information so only the solution to the problem is available. that's why the method looks unusefull :) ):

def some_function(key, interpolation_var, value)
  t(key, :#{interpolation_var} => value)
end

Upvotes: 0

Jörg W Mittag
Jörg W Mittag

Reputation: 369458

In Ruby, instance variable names always have to start with an @ sigil.

Upvotes: 7

ScottJShea
ScottJShea

Reputation: 7111

This instance_variable_set("#{foo}", "cornholio") needs to read instance_variable_set("@#{foo}", "cornholio")

Based on this post. Just tried it in my irb for Ruby 1.93; the post is from 2009.

Upvotes: 39

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