A HashBinding class takes a simple ruby hash and uses a class's binding to create the context for the rendering of an ERB template.

hash_binding_example.rb

require 'erb'

class HashBinding
  def initialize(hash)
    hash.each do |key, value|
      singleton_class.send(:define_method, key) { value }
    end 
  end

  def context
    binding
  end
end

data = {
  weekday: Time.now.strftime('%A')
}

simple_template = "Today is <%= weekday %>."

renderer = ERB.new(simple_template)
hash_binding = HashBinding.new(data)

output = renderer.result(hash_binding.context)

puts output