帮助请写orm-request。
表:
users:
id: integer
name: varchar
posts:
id: integer
title: varchar
user_id: integer
views: integer
模型:
User:
class User < ActiveRecord::Base
has_many :posts, dependent: :destroy
end
Posts:
class Post < ActiveRecord::Base
belongs_to :user
end
控制器:
def popular_diary
@users = User.joins(:posts).group_by(:user_id).order('SUM(posts.views)')
end
HTML:
<% @users.each do |user| %>
<div class="row">
<%= link_to user_posts_url(user.id) do %>
<div><%= user.name %></div>
<% end %>
</div>
<% end %>
我需要所有用户按特定顺序孵化。 order ('SUM (posts.views)
问题是屏幕显示以下错误消息:
错误的参数数量(0表示1)
答案 0 :(得分:1)
它是group
,而不是group_by
def popular_diary
@users = User.joins(:posts).group(:user_id).order('SUM(posts.views)')
end