fix the sql that is generated from scoping
Created an unscope method for removing relations from a chain of
relations. Specific where values can be unscoped, and the unscope method
still works when relations are merged or combined.
Merge pull request #9532 from neerajdotname/fix-sql-in-example

In example fix sql that is generated from scoping
Merge pull request #9200 from wangjohn/unscoping_activerecord_merging

Introduce relation #unscope
add prompt to 422 page to check logs
Merge pull request #9537 from NARKOZ/patch-6

add prompt to 422 page to check logs
Use 1.9 hash style in changelog and doc examples [ci skip]
Remove .all usage from unscope doc examples [ci skip]
Fix formats on xhr requests when HTTP_ACCEPT is empty string

Fix ActionDispatch::Request#formats on xhr requests when HTTP_ACCEPT
header is empty string. About issue #7774, same fix as in commit bebb02f
but for xhr requests.
Fixed typo in active record's changelog
Merge pull request #9540 from dimko/patch-1

Fixed typo in active record's changelog
Merge pull request #9541 from maximerety/fix_7774

Fix formats on xhr requests when HTTP_ACCEPT is empty string