All queries should be empty! :). This can be run on a rails 3.2.x codebase to make sure ActiveRecords is prepared for rails 4. This does NOT handle rails4 methods that have no rails 3.2 counterpart.

rails-4-clean_guide.sh

# no find_all_by
grep -e "find_all_by" -r --include "*.rb" .

# no :conditions
grep -e ":conditions" -r --include "*.rb" .

# no naked scopes
grep -r -e "scope :" --include "*.rb" . | grep -v "lambda" | grep -v '\->'

# no naked default_scopes
grep -r -e "default_scope" --include "**/models/*.rb" . | grep -v "lambda" | grep -v '\->'