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テンプレートがあるかないか調べる

Posted at 2012-10-29

app/views/posts/_formのpartialがあるかどうか知りたい時

lookup_context.exists?('form', 'posts', true)

参考URLのstackoverflowでは例外を使ったやりかたも紹介されていた

<%= render :partial => "#{dynamic_partial}" rescue render :partial => 'partial_that_actually_exists' %>

参考
http://api.rubyonrails.org/classes/ActionView/LookupContext/ViewPaths.html#method-i-find_template
http://stackoverflow.com/questions/3559419/is-there-any-rails-function-to-check-if-a-partial-exists

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