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documents the changes to String#blank? in the AS guide

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commit 0e6f19cc9bbad22543223550afb3e321309fe07f 1 parent e175117
@fxn fxn authored
Showing with 3 additions and 1 deletion.
  1. +3 −1 railties/guides/source/active_support_core_extensions.textile
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4 railties/guides/source/active_support_core_extensions.textile
@@ -78,12 +78,14 @@ The following values are considered to be blank in a Rails application:
* +nil+ and +false+,
-* strings composed only of whitespace, i.e. matching +/\A\s*\z/+,
+* strings composed only of whitespace (see note below),
* empty arrays and hashes, and
* any other object that responds to +empty?+ and it is empty.
+INFO: In Ruby 1.9 the predicate for strings uses the Unicode-aware character class <tt>[:space:]</tt>, so for example U+2029 (paragraph separator) is considered to be whitespace. In Ruby 1.8 whitespace is considered to be <tt>\s</tt> together with the ideographic space U+3000.
+
WARNING: Note that numbers are not mentioned, in particular 0 and 0.0 are *not* blank.
For example, this method from +ActionDispatch::Session::AbstractStore+ uses +blank?+ for checking whether a session key is present:

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