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module Moneta
# This provides an each_key implementation that works in most cases.
# @api private
module EachKeySupport
def each_key
return enum_for(:each_key) unless block_given?
if @backend.respond_to?(:each_key)
@backend.each_key { |key| yield key }
elsif @backend.respond_to?(:keys)
if keys = @backend.keys
keys.each { |key| yield key }
end
elsif @backend.respond_to?(:each)
@backend.each { |key, _| yield key }
else
raise ::NotImplementedError, "No enumerable found on backend"
end
self
end
def self.included(base)
base.supports(:each_key) if base.respond_to?(:supports)
end
end
end
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