Ruby on Rails

In my Rails 4 application, when I have a form including a password, i.e.

<%= password_field_tag 'admpwd', nil, size:32, maxlength: 32, class:
'admentry' %>

I don't like the fact that the password is shown plain text in the log
file, and would like to disable this. I found several suggestions to
place the call

filter_parameter_logging "password"

into application.rb, but when I do it, I get the error message

undefined method `filter_parameter_logging' for
Tamsin::Application:Class

How can I do this correctly?

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