如何在rails中的group_by记录查询中进行订购

Question

This is my current code

cat = Category.select(:id, :name, :parent, :jobs_count).group_by{|p| p.parent}

cat.each do |parent, childs|
   = parent
   childs.each do |name|
     = name.name
   end
end

the results of this are,

Technology (The parent)

• Ruby
• Rails
• Programming

Now I want to order childs records by jobs_count , I am trying to do it using the code below,

childs.order(jobs_count: :desc).each do |name|
Error:
=> undefined method `order' for #<Array:0x007f11cc08a2c0>

also like that into main query

Category.select(:id, :name, :parent, :jobs_count).group_by{|p| p.parent}.order(jobs_count: :desc)
Error:
#=> undefined method `order' for #<Array:0x007f11cc242e50>

It not working for me, how can I order the records by jobs_count

Answer 1

You can be using sort_by method like on the childs.each block like the following

childs.sort_by{|j| - j.jobs_count }.each do |name|

So the full code is:

cat.each do |parent, childs|
   = parent
   childs.sort_by{|j| - j.jobs_count }.each do |name|
     = name.name
   end
end

It should work.