ActiveRecord :: StatementInvalid：PG :: InvalidTextRepresentation：ERROR：整数的输入语法无效：“”

Question

rails - 5.2

MyModel.order("(data ->> 'position')::Integer ASC").each {|x| puts x.position}

我收到以下错误

  

ActiveRecord :: StatementInvalid：PG :: InvalidTextRepresentation：ERROR：整数的输入语法无效：“”

任何帮助将不胜感激