Rendering issue in views in ruby on rails

问题

The code in the view shall give the books in the database

<% @bookmark.each do |book| %> 

works only for multiple rows. If i had single row, it would show error like

" undefined method `each' for #<Bookmark:0x3e2e3f0> "

What should i do to print single row also. ?

回答1:

<% @array_bookmark = @bookmark.class == Array ? @bookmark : [@bookmark] %>
<% @array_bookmark.each do |book| %> 

回答2:

Just wrap @bookmark in Array(), like this:

<% Array(@bookmark).each do |book| %>

Incidentally you should really rename @bookmark to @bookmarks.

来源：https://stackoverflow.com/questions/13836591/rendering-issue-in-views-in-ruby-on-rails