在MySQL2中随机提供Rails 4应用

Question

I'm using @places = Place.all.limit(2).order("RANDOM()") for my app in production server and it working ok, but with passenger it showing me an error ActionView::Template::Error (Mysql2::Error: FUNCTION daysandnights.RANDOM does not exist: SELECT places .* FROM places ORDER BY RANDOM() LIMIT 2): .

How can i fix this issue? Thanks in advance

Answer 1

我认为您应该使用RAND() https://dev.mysql.com/doc/refman/5.0/en/mathematical-functions.html#function_rand

Answer 2

@gotva, your answer can work.

Specifically, when production I use rand(), when development I use random().

if Rails.env.production? 
  scope :random8, -> { limit(8).order("RAND()") }
elsif Rails.env.development? 
  scope :random8, -> { limit(8).order("RANDOM()") }
end