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class Object
# Returns true if this object is included in the argument. Argument must be
# any object which responds to +#include?+. Usage:
#
# characters = ["Konata", "Kagami", "Tsukasa"]
# "Konata".in?(characters) # => true
#
# This will throw an ArgumentError if the argument doesn't respond
# to +#include?+.
def in?(another_object)
another_object.include?(self)
rescue NoMethodError
raise ArgumentError.new("The parameter passed to #in? must respond to #include?")
end
# Returns the receiver if it's included in the argument otherwise returns +nil+.
# Argument must be any object which responds to +#include?+. Usage:
#
# params[:bucket_type].presence_in %w( project calendar )
#
# This will throw an ArgumentError if the argument doesn't respond to +#include?+.
#
# @return [Object]
def presence_in(another_object)
self.in?(another_object) ? self : nil
end
end
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