Rails: How to Solve devise error undefined method failure

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I bumped into the following error when I was creating API program. The origin was devise gem.

NoMethodError (undefined method `failure_app’ for nil:NilClass)

Environment

Ruby 2.2.3p173
Rails 4.2.4
devise 3.5.2

Origin

I used sign_in method for unauthorized user.

The API in construction, we have to make unauthorized user able to login, so I wrote logging in procedure for all users, including unauthorized users. Then, devise and warden rejected unauthorized user and raised error.

Solution

Write the following setting into config/initializer/devise.rb.

config.allow_unconfirmed_access_for = 2000.years

1	config.allow_unconfirmed_access_for = 2000.years

Or write the following method into the model class that is used by devise for authentication. User class for example.

private
def confirmation_period_valid?
return true
end

private

def confirmation_period_valid?

return true

end

I recommend latter solution.

`confirmation_period_valid?`

confirmation_period_valid? method is defined at the module Devise::Models::Confirmable of devise gem.

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Rails: How to Solve devise error undefined method failure_app for nil class