[Ruby on Rails] Ranking display (total, average value)


Ranking display

Development environment

ruby 2.5.7 Rails OS: macOS Catalina


--Only controller and view changed --user model --post model (: body,: score) --Like function implementation --Comment sentiment analysis by Google Natural Language API has been introduced (post scoring)

controller If you can do it with a controller, it's almost possible!

Mean ranking: app/controllers/users_controller.rb

  def rank
    @users = User.
                    order('avg(score) desc').
Supplement [email protected] = User.find (): Enter the value obtained from the User model in @user under the following conditions. -Post.group (: score): Group by score column from Post model -Order ('avg (score) desc'): Sort in descending order by average score -Pluck (: user_id): Arrange all the ones with the above value user_id

Total ranking: app/controllers/posts_controller.rb

  def rank
    @posts = Post.
                    order('count(post_id) desc').
Supplement [email protected] = Post.find (): Enter the value obtained from the Post model under the following conditions in @post -Favorite.group (: post_id): Group by post_id column from Favorite model -Order ('count (post_id) desc'): Sort in descending order by the number of post_ids -Pluck (: post_id): Arrays of all post_ids with the above values

view Can be displayed in descending order of each as shown below


<% @users.each do |user| %>
<% end %>
<% @posts.each do |user| %>
<% end %>

When using Kaminari

If you add Kaminari.paginate_array () in front and .page (params [: page]) in the end, it's OK.


@posts = Kaminari.paginate_array(Post.find(Favorite.group(:post_id).order('count(post_id) desc').pluck(:post_id))).page(params[:page])

Reference site

[Easy ranking function with Rails] (https://qiita.com/mitsumitsu1128/items/18fa5e49a27e727f00b4) [Rails] Implementation of ranking function

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