def will_paginate(collection = nil, options = {})
options, collection = collection, nil if collection.is_a? Hash
unless collection or !controller
collection_name = "@#{controller.controller_name}"
collection = instance_variable_get(collection_name)
raise ArgumentError, "The #{collection_name} variable appears to be empty. Did you " +
"forget to pass the collection object for will_paginate?" unless collection
end
return nil unless WillPaginate::ViewHelpers.total_pages_for_collection(collection) > 1
options = options.symbolize_keys.reverse_merge WillPaginate::ViewHelpers.pagination_options
if options[:prev_label]
WillPaginate::Deprecation::warn(":prev_label view parameter is now :previous_label; the old name has been deprecated", caller)
options[:previous_label] = options.delete(:prev_label)
end
renderer = case options[:renderer]
when String
options[:renderer].to_s.constantize.new
when Class
options[:renderer].new
else
options[:renderer]
end
renderer.prepare collection, options, self
renderer.to_html
end