• Why an instance method not available in class method?

because you need an object of the class to call an instance method

  • where to change home directory and shell?

/etc/passwd on your machine

  • why do operation in migration instead of database level?

Because it is more flexible using validations, and more important, is to change active records correctly! It is dangerous to change db without testing.

  • CLN = chang list number, VFI = version filter instance

soggy adj, soft, wet: the bag of cookies will become soggy if we don’t zip it.

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