Question

使用Rails 4和Ruby 2.2，我有主题列表页面，我需要为主题的名称，用户名，活动和与主题相关的书籍添加过滤器。所有三个模型，即

主题，书籍和用户

关联如下：

user.rb

class User < ActiveRecord::Base
  has_many :subjects, dependent: :destroy
  has_many :books, dependent: :destroy
end

book.rb

class Book < ActiveRecord::Base
    belongs_to :subject, dependent: :destroy
    belongs_to :user, dependent: :destroy
    has_many :images, dependent: :destroy
end

subject.rb中

class Subject < ActiveRecord::Base
  belongs_to :user
  has_many :books
  validates :name, presence: true,
                length: { minimum: 3 }


  def self.names(name)
    subject = all
    subject = subject.where("name LIKE ?", "%#{name}%")
    return subject
  end


  def self.actives(active)
    subject = all
    subject = subject.where("active = ?", "%#{active}%")
    return subject
  end


  def self.usernames(username)
    user = all
    user = user.where("username LIKE ?", "%#{username}%")
    return user
  end

end

现在我正尝试使用以下列

在主题列表页面上进行过滤

用户名（从用户表下拉）

主题名称（主题表中的文本字段）

有效（从主题表下拉）

有书（复选框，与书籍的关联，如果选中，只显示那些有书籍的科目）

我的主题索引如下：

subjects_controller.rb

def index

   @subjects = Subject.page(params[:page]).per(10)
   @users = User.all
   @subjects = @subjects.names(params[:name]) if params[:name].present?
   @subjects = @subjects.actives(params[:active]) if params[:active].present?
   @users = @users.usernames(params[:username]) if params[:username].present?
end

和我的

index.html.erb

为：

<h1>Listing Subjects</h1>
<%= link_to 'New Subject', new_subject_path %>

<%= form_tag subjects_path, :method=> "get" do %>

  <%= label_tag :username, "Username" %>
  <%= select_tag :username, options_from_collection_for_select(User.all, "id", "username", username) %>

  <%= label_tag :name, "Subject Name"%>
  <%= text_field_tag :name %>


  <%= label_tag :active, "Active" %>
  <%= select_tag :active, options_for_select([['Active', true], ['Inactive', false]]) %>


  <%= submit_tag "submit" %>
  <%= link_to "Clear Search", request.path, class:"cancel-button" %>
<% end %>


<div id="subjects"><%= render "index" %></div>

<%= paginate @subjects %><br>

我的控制台日志如下：

Started GET "/subjects?utf8=%E2%9C%93&username=11&name=&active=false&commit=submit" for ::1 at 2016-04-19 10:20:06 +0530
Processing by SubjectsController#index as HTML
  Parameters: {"utf8"=>"✓", "username"=>"11", "name"=>"", "active"=>"false", "commit"=>"submit"}
  User Load (0.4ms)  SELECT  `users`.* FROM `users` WHERE `users`.`id` = ?  ORDER BY `users`.`id` ASC LIMIT 1  [["id", 11]]
  User Load (0.6ms)  SELECT `users`.* FROM `users`
  Subject Load (0.5ms)  SELECT  `subjects`.* FROM `subjects` WHERE (active = '%false%') LIMIT 10 OFFSET 0
  Rendered subjects/_index.html.erb (5.1ms)
   (0.5ms)  SELECT COUNT(*) FROM `subjects` WHERE (active = '%false%')
  Rendered subjects/index.html.erb within layouts/application (34.9ms)
Completed 200 OK in 99ms (Views: 94.1ms | ActiveRecord: 2.1ms)

问题：

如何在过滤器列表
如何制作过滤清单，是否有书籍？
主题（布尔数据类型）列表的活动如何工作？
如何完成图书可用性的复选框，意味着，如果标记了复选框，我只需要显示那些有书籍的主题。

如果我需要提供更多详情，请告诉我

过滤与其他模型

0 个答案: