Add case_sensitive option for confirmation validation

Case :- 1. In case of email confirmation one needs case insensitive comparison
        2. In case of password confirmation one needs case sensitive comparison

[ci skip] Update Guides for case_sensitive option in confirmation validation

1 files changed, 10 insertions, 0 deletions

diff --git a/guides/source/active_record_validations.md b/guides/source/active_record_validations.md
index 1c1b863fe9..83eee4e0f4 100644
--- a/guides/source/active_record_validations.md
+++ b/guides/source/active_record_validations.md
@@ -327,6 +327,16 @@ class Person < ActiveRecord::Base
 end
 ```
 
+There is also a `:case_sensitive` option that you can use to define whether the
+confirmation constraint will be case sensitive or not. This option defaults to
+true.
+
+```ruby
+class Person < ActiveRecord::Base
+  validates :email, confirmation: { case_sensitive: false }
+end
+```
+
 The default error message for this helper is _"doesn't match confirmation"_.
 
 ### `exclusion`