Created
October 23, 2013 06:24
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Another enum-ish example
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class SomeTypes | |
@all = [ | |
["TypeA", "Type A"], | |
["Type B", "Type B"], | |
] | |
Type = Struct.new(:type, :name, :slug, :sym) do | |
alias_method :to_ary, :to_a | |
# allows Type to be used for ifnone option in .find | |
def self.call | |
new | |
end | |
end | |
Type.members.each do |member| | |
# define named helpers to return all i.e. .types, .names, .slugs | |
define_singleton_method member.to_s.pluralize do | |
all.map(&member) | |
end | |
# named finder i.e. .by_type, .by_name, .by_slug | |
define_singleton_method "by_#{member}" do |cond| | |
find(member => cond) | |
end | |
end | |
ALL = Array.new.tap do |all| | |
@all.each do |ary| | |
type = ary.first | |
name = ary.last | |
all << Type.new(type, name, type.parameterize, type.underscore.to_sym) | |
end | |
end | |
ALL.each do |t| | |
# define constant for each type | |
const_set(t.type.upcase, t.type) | |
end | |
def self.all | |
ALL | |
end | |
def self.each(&block) | |
all.each(&block) | |
end | |
def self.find(cond) | |
cond = { type: cond } if cond.is_a?(String) | |
cond = cond.first | |
all.find(Type){ |t| t.send(cond.first) == cond.last } | |
end | |
def self.[](cond) | |
find(cond) | |
end | |
def self.to_options | |
all.map{ |t| [t.name, t.type] } | |
end | |
end | |
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