class RenderWithView::HalfOpenStruct

Like OpenStruct but doesn’t let you read a non-assigned value (raises instead of returning nil). This avoids issues where you read the wrong value due to a typo and don’t notice.

Borrowed from @henrik, gist.github.com/henrik/19c68b2a41ab4d098ce8

Public Class Methods

new(hash = {}) click to toggle source
# File lib/render_with_view/half_open_struct.rb, line 10
def initialize(hash = {})
  @hash = hash
end

Public Instance Methods

fetch(name, fallback) click to toggle source
# File lib/render_with_view/half_open_struct.rb, line 18
def fetch(name, fallback)
  @hash.fetch(name, fallback)
end
include?(name) click to toggle source
# File lib/render_with_view/half_open_struct.rb, line 14
def include?(name)
  @hash.include?(name)
end
method_missing(name, *args) click to toggle source
# File lib/render_with_view/half_open_struct.rb, line 22
def method_missing(name, *args)
  if name.to_s.end_with?("=")
    write(name.to_s.chop.to_sym, *args)
  elsif args.length == 0
    read_or_raise(name)
  else
    raise NoMethodError
  end
end

Private Instance Methods

read_or_raise(name) click to toggle source
# File lib/render_with_view/half_open_struct.rb, line 38
def read_or_raise(name)
  @hash.fetch(name) { raise "Unknown key: #{name}" }
end
write(name, value) click to toggle source
# File lib/render_with_view/half_open_struct.rb, line 34
def write(name, value)
  @hash[name] = value
end