更新开始优化红宝石查询
这个问题是与再现的形式对每一个项目,而不是与SQL查询。为了优化我将根据需要添加表单与JavaScript。
好像我没看过miniprofiler日志正确的。我道歉,但留下可能有类似问题的其他人的问题。
更新结束
我使用miniprofiler找到我的应用程序的瓶颈。我找到了一个!
SELECT "projects".* FROM "projects" INNER JOIN "memberships" ON
"projects"."id" = "memberships"."project_id" WHERE
"memberships"."user_id" = 1 AND (active = 't')
1059.50 ms
Rendering: projects/_index — 1023.18 ms
它在1秒内发现了185个项目。
我怎样才能进行查询,这是否更有效?
我有这个在我的projects_controller指数
@projects = current_user.projects.is_active
在项目模型IS_ACTIVE范围
scope :is_active, where(["active = ?", true])
的项目和用户有一个多对多的关系,有一个会员连接表
的会员制模式
class Membership < ActiveRecord::Base
attr_accessible :project_id,:user_id,:created_at,:updated_at
belongs_to :user
belongs_to :project
end
成员表
def self.up
create_table :memberships do |t|
t.integer :project_id
t.integer :user_id
t.timestamps
end
add_index :memberships, [:project_id, :user_id], :unique => true
end
我在生产环境中的本地计算机在PostgreSQL作为数据库
添加由吉里·波斯皮西尔要求解释运行此。在控制台中,它看起来并不慢。这个解释是在开发中完成的。有同样的问题还有
User.first.projects.is_active.explain
User Load (0.3ms) SELECT "users".* FROM "users" LIMIT 1
Project Load (2.3ms) SELECT "projects".* FROM "projects" INNER JOIN "memberships" ON "projects"."id" = "memberships"."project_id" WHERE "memberships"."user_id" = 1 AND (active = 't')
EXPLAIN (0.2ms) EXPLAIN QUERY PLAN SELECT "projects".* FROM "projects" INNER JOIN "memberships" ON "projects"."id" = "memberships"."project_id" WHERE "memberships"."user_id" = 1 AND (active = 't')
=> "EXPLAIN for: SELECT \"projects\".* FROM \"projects\" INNER JOIN \"memberships\" ON \"projects\".\"id\" = \"memberships\".\"project_id\" WHERE \"memberships\".\"user_id\" = 1 AND (active = 't')\n0|0|1|SEARCH TABLE memberships USING INDEX index_memberships_on_user_id (user_id=?) (~10 rows)\n0|1|0|SEARCH TABLE projects USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)\n"
视图
<% @projects.each do |project| %>
<li class="tab_list" id="project_<%= project.id.to_s %>">
<div class="tab_list_text"><%= link_to project.name, project_path(project) %></div>
<span class='open_project_update button edit' id="project_update" data-id="<%= project.id %>" data-object="project" title="Edit project">Edit</span>
<div class="dialog_form" id="project_update_<%= project.id %>_form" title="Update project" style="display:none;">
<%= form_for(project) do |f| %>
<ul>
<li><%= f.label :name %><%= f.text_field :name %></li>
<li><%= f.label :description %><%= f.text_field :description %></li>
<li><%= f.label :due %><%= f.text_field :due, :value => project.due.strftime("%Y-%m-%d"), :id => "date_project_#{project.id}" %></li>
<li><%= f.label :customer_id %><%= f.select(:customer_id, @customers.map {|customer| [customer.name, customer.id]}, {:include_blank => 'None'})%></li>
<li><%= f.submit 'Save', :class => 'submit' %></li></ul>
<% end %>
</div>
<a class="activate_project button" data-object="project" data-id="<%= project.id.to_s %>">Archive</a>
</li>
<% end %>
你能解释一下运行查询吗? –
我已经用解释 –
更新了这个问题。项目负载只需要2.3ms。呈现项目/ _index的时间是1秒。查询不是你的瓶颈。或者,也许我错了......我整晚都在睡觉。 –