Unfortunately, defining class methods as private is a bit more involved than simply defining them after private.
The incorrect way
module Operations
private
def self.private_operation
"secret"
end
end
Operations.private_operation #=> "secret" # oh, no!
The correct way
module Operations
private_class_method def self.private_operation
"secret"
end
end
Operations.private_operation
#=> private method `private_operation' called for Operations:Module (NoMethodError)
It's probably a good practice to place these private class methods right after private, even though it does nothing for them, just to have a consistent class structure:
class Operations
def self.public_class_method
...
def public_instance_method
...
private
private_class_method def self.private_operation
"secret"
def private_instance_method
...
end
The Rails option
Rails' extend ActiveSupport::Concern provides the class_methods block which will honour private definitions:
module Operations
extend ActiveSupport::Concern
class_methods do
def public_operation
"yay!" + private_operation
end
private
def private_operation
"secret"
end
end
end
includer = Class.new do
include Operations
end
includer.private_operation
#=> private method `private_operation' called for Class ... (NoMethodError)
includer.public_operation #=> "yay!secret"
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