Added `rewhere` usage to AR querying guides
Merge pull request #13026 from vipulnsward/document_rewhere

Added `rewhere` usage to AR querying guides
Better error message for typos in assert_response argument.

This commit makes it really easy to debug errors due to typos like
"assert_response :succezz".
Merge pull request #13025 from pwnall/nice_test

Better error message for typos in assert_response argument.
`delgated` => `delegated`
Merge pull request #13029 from akshay-vishnoi/documentation

`delgated` => `delegated`
avoiding calling of #option_value_selected? two times
Merge pull request #13027 from akshay-vishnoi/f-refactor

avoiding calling of #option_value_selected? two times
Revert "Merge pull request #13027 from akshay-vishnoi/f-refactor"

This reverts commit f4a5a9ea4d183f4102796215d4502c46dbe3e52b, reversing
changes made to 7ccb482181ee6c47c765406009018a15172812de.

Reason:

The logic is different, the first call to #option_value_selected? is for
the :selected option (the argument is the "selected" variable), the second
call is for the :disabled option (the argument is the "disabled" variable).