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-rw-r--r--actionview/app/assets/javascripts/rails-ujs/start.coffee3
1 files changed, 2 insertions, 1 deletions
diff --git a/actionview/app/assets/javascripts/rails-ujs/start.coffee b/actionview/app/assets/javascripts/rails-ujs/start.coffee
index 55595ac96f..32a915ac0b 100644
--- a/actionview/app/assets/javascripts/rails-ujs/start.coffee
+++ b/actionview/app/assets/javascripts/rails-ujs/start.coffee
@@ -9,7 +9,8 @@
} = Rails
# For backward compatibility
-if jQuery? and jQuery.ajax? and not jQuery.rails
+if jQuery? and jQuery.ajax?
+ throw new Error('If you load both jquery_ujs and rails-ujs, use rails-ujs only.') if jQuery.rails
jQuery.rails = Rails
jQuery.ajaxPrefilter (options, originalOptions, xhr) ->
CSRFProtection(xhr) unless options.crossDomain