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| author | Xavier Noria <fxn@hashref.com> | 2011-07-20 12:17:01 +0200 |
|---|---|---|
| committer | Xavier Noria <fxn@hashref.com> | 2011-07-20 12:17:37 +0200 |
| commit | 0e6f19cc9bbad22543223550afb3e321309fe07f (patch) | |
| tree | ae68e49aa8d4f47c5e4d5ba308c4bad9bdaf52a6 /railties/guides/source/active_support_core_extensions.textile | |
| parent | e175117eaff267badfa6000382cdfd1a85eef945 (diff) | |
| download | rails-0e6f19cc9bbad22543223550afb3e321309fe07f.tar.gz rails-0e6f19cc9bbad22543223550afb3e321309fe07f.tar.bz2 rails-0e6f19cc9bbad22543223550afb3e321309fe07f.zip | |
documents the changes to String#blank? in the AS guide
Diffstat (limited to 'railties/guides/source/active_support_core_extensions.textile')
| -rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index a0ed85cf01..b35e04d7e1 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/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: |