replace all older rocket sign to new ":" from examples of active record and active models
Merge pull request #11067 from rajars2576/fix_older_rocket

replace all older rocket sign to new ":" from examples of active record ...
test-case to prevent regressions described in #10901.
Fix `another_contract` not being used warning
Merge pull request #11075 from vipulnsward/remove_record

Remove `another_contract` as it isn't being used