Ruby templates: How to pass variables into inlined ERB?

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I have an ERB template inlined into Ruby code:

require 'erb'

DATA = {
    :a => "HELLO",
    :b => "WORLD",
}

template = ERB.new <<-EOF
    current key is: <%= current %>
    current value is: <%= DATA[current] %>
EOF

DATA.keys.each do |current|
    result = template.result
    outputFile = File.new(current.to_s,File::CREAT|File::TRUNC|File::RDWR)
    outputFile.write(result)
    outputFile.close
end

I can't pass the variable "current" into the template.

The error is:

(erb):1: undefined local variable or method `current' for main:Object (NameError)

How do I fix this?

erb templates syntax ruby
10 Answers

Maybe the cleanest solution would be to pass specific current local variable to erb template instead of passing the entire binding. It's possible with ERB#result_with_hash method (introduced in Ruby 2.5)

DATA.keys.each do |current|
  result = template.result_with_hash(current: current)
...
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