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Problem
When trying to use the acts_as_ferret plugin in a search page by using the find_by_contents method then the following error appears:

undefined method `find_by_contents'

Solution
It seems that the API of the plugin has changed, and the

find_by_contents

method should be replaced with the:

find_with_ferret

method

Problem
After a recent upgrade to a newer rails version the gem package manager seems to be broken. Everytime you try to use gem install gem_name, you get the following error:

ERROR:  While executing gem ... (Gem::GemNotFoundException)

Deleting the cached files as suggested in other posts results in the error:

ERROR:  While executing gem ... (ArgumentError)

Solution
As suggested here, you need to do:

gem install rubygems-update
update_rubygems

which should be updating the gem version to the latest one, ie 1.3.0