ruby - how to solve undefined local variable or method `has_mailbox'? -

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i following this tutorial add messaging functionality between users in rails app, got error in user model.

class user < activerecord::base   has_mailbox end

this gives me following error:

undefined local variable or method `has_mailbox' #<class:0xb60f6f84>

any ideas?

i've checked gem, try run

rails g has_mailbox:install

when install gem in rails app, idea check generators available

rails g //list of available generators

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