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-rw-r--r--actionpack/lib/action_dispatch/routing/mapper.rb15
1 files changed, 9 insertions, 6 deletions
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 7c0404ca62..e676c837b4 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -600,17 +600,20 @@ module ActionDispatch
def mount(app, options = nil)
if options
path = options.delete(:at)
- else
- unless Hash === app
- raise ArgumentError, "must be called with mount point"
- end
-
+ elsif Hash === app
options = app
app, path = options.find { |k, _| k.respond_to?(:call) }
options.delete(app) if app
end
- raise "A rack application must be specified" unless path
+ raise ArgumentError, "A rack application must be specified" unless app.respond_to?(:call)
+ raise ArgumentError, <<-MSG.strip_heredoc unless path
+ Must be called with mount point
+
+ mount SomeRackApp, at: "some_route"
+ or
+ mount(SomeRackApp => "some_route")
+ MSG
rails_app = rails_app? app
options[:as] ||= app_name(app, rails_app)