ruby on rails - undefined method 'url' for "filename.png":String` -

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again in trouble. everythings works fine, reebot , got error undefined method 'url' "1503393906_pointer.png":string. error occurs when enter in property (view & edit).

part of _form.html.erb

<% if !@property.slider1.url.nil? %>     <%= content_tag :p, file.basename(@property.slider1.path)%>     <label><%= form.check_box :remove_slider1 %> remove slier #1 </label> <% end %>

part of property.rb (model)

class property < applicationrecord             mount_uploader :slider1, slideruploader end

part of slider_uploader.rb

class slideruploader < carrierwave::uploader::base      storage :file      def store_dir         "cdn"      end      def extension_whitelist           %w(jpg jpeg gif png avi mp4)      end       def content_type_whitelist           ['image/jpeg', 'image/gif', 'image/png', 'image/svg+xml',            'image/bmp', 'video/x-msvideo']      end      def filename           "#{time.now.to_i}_#{original_filename}" if original_filename      end  end





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