如何在ruby中按多个属性对数组进行排序？

Question

I have list of user profiles. I need to sort the user profile based on following criteria as shown below:

profile_claimed(boolean) -> profile_complete_status(integer) -> No_of_friends(integer)

code:

user_profiles.sort { |x| [x.claim ? 0 : 1, x.complete_profile_status, x.no_of_friends] }

How to sort the user profile?

Answer 1

You could use sort_by :

user_profiles.sort_by do |x| 
  [(x.claim ? 0 : 1), x.complete_profile_status, x.no_of_friends]
end

Also it is worth noting that sort_by is usually faster than sort , because it caches the result of the comparison operation, which in this case is

(x.claim ? 0 : 1), x.complete_profile_status, x.no_of_friends

and does not recalculate the values for each comparison between two elements.

Answer 2

You need to use sort method with block:

ary.sort do |x,y|
  if x > y
    1
  elsif x < y
    -1
  else
    0
  end
end

Just make sure to return +1 when x follows y , -1 when y follows x , or 0 when they are equal.

http://ruby-doc.org/core-2.2.0/Array.html#method-i-sort