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| -rw-r--r-- | railties/guides/source/active_support_overview.textile | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/railties/guides/source/active_support_overview.textile b/railties/guides/source/active_support_overview.textile index 3f6e9b306d..fde50b08ec 100644 --- a/railties/guides/source/active_support_overview.textile +++ b/railties/guides/source/active_support_overview.textile @@ -884,6 +884,22 @@ invoices.index_by(&:number) WARNING. Keys should normally be unique. If the block returns the same value for different elements no collection is built for that key. The last item will win. +h4. +many?+ + +The method +many?+ is shorthand for +collection.size > 1+: + +<erb> +<% if pages.many? %> + <%= pagination_links %> +<% end %> +</erb> + +If an optional block is given +many?+ only takes into account those elements that return true: + +<ruby> +@see_more = videos.many? {|video| video.category == params[:category]} +</ruby> + h3. Extensions to +Array+ h4. Accessing |