Я следовал руководству Hartl, чтобы создать ToDoList с системой тегов, также с помощью этого словесного руководства и RailsCast Tutorial .Однако я не очень понимаю, как система тегов работает с точки зрения фильтрации, поэтому я просто скопировал ее и импровизировал.Мое лучшее предположение состоит в том, что он должен использовать метод tagged_with, но консольный тест по-прежнему отображает все микросообщения.
У меня проблема с моей системой фильтрации, поскольку теперь она просто перенаправляет на совершенно новыйстраница, которая содержит все задачи, включая те, которые не имеют тега clicked.Этот эксперимент проводится на моем локальном компьютере при нажатии tag2.
До 
После 
Вот журнал, который возникает, и некоторые вопросы, которые у меня есть о журналах, прокомментированных внутри
Started GET "/tags/try2" for 127.0.0.1 at 2019-01-27 17:33:53 +0800
Processing by MicropostsController#index as HTML
Parameters: {"tag"=>"try2"}
User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2 [["id", 101], ["LIMIT", 1]]
↳ app/helpers/sessions_helper.rb:10
Tag Load (0.3ms) SELECT "tags".* FROM "tags" WHERE "tags"."name" = $1 LIMIT $2 [["name", "try2"], ["LIMIT", 1]]
↳ app/models/micropost.rb:13
Rendering microposts/index.html.erb within layouts/application
(0.6ms) SELECT COUNT(*) FROM "microposts" INNER JOIN "taggings" ON "microposts"."id" = "taggings"."micropost_id" WHERE "taggings"."tag_id" = $1 [["tag_id", 10]]
↳ app/views/microposts/index.html.erb:2
Micropost Load (0.3ms) SELECT "microposts".* FROM "microposts" WHERE "microposts"."user_id" = $1 ORDER BY "microposts"."created_at" DESC [["user_id", 101]]
↳ app/views/microposts/index.html.erb:3
Tag Load (0.3ms) SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."micropost_id" = $1 [["micropost_id", 62]]
↳ app/views/microposts/index.html.erb:5
##The taggings.micropost_id = $1 for some reason here
##It's strange why the next even tag loads again for the 2nd time, when there are only 2 tags
Tag Load (0.3ms) SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."micropost_id" = $1 [["micropost_id", 61]]
↳ app/views/microposts/index.html.erb:5
Rendered microposts/index.html.erb within layouts/application (7.1ms)
Rendered layouts/_rails_default.html.erb (58.5ms)
Rendered layouts/_shim.html.erb (0.3ms)
Rendered layouts/_header.html.erb (0.8ms)
Rendered layouts/_footer.html.erb (1.3ms)
Completed 200 OK in 96ms (Views: 84.1ms | ActiveRecord: 2.4ms)
Вот мой код контроллера:
MicropostsController
class MicropostsController < ApplicationController
before_action :logged_in_user, only: [:index, :show, :create, :destroy]
before_action :correct_user, only: :destroy
def index
@microposts = current_user.microposts
@microposts = @microposts.tagged_with(params[:tag]) if params[:tag]
@microposts = @microposts.paginate(page: params[:page])
end
def show
@micropost = Micropost.find(params[:id])
end
def create
@micropost = current_user.microposts.build(micropost_params)
if @micropost.save
flash[:success] = "Micropost created!"
redirect_to root_url
else
@feed_items = []
render 'static_pages/home'
end
end
def destroy
@micropost.destroy
flash[:success] = "You have deleted a task!"
redirect_to request.referrer || root_url
end
private
def micropost_params
params.require(:micropost).permit(:content, :tag_list, :tag,
{tag_ids: [] }, :tag_ids)
end
def correct_user
@micropost = current_user.microposts.find_by(id: params[:id])
redirect_to root_url if @micropost.nil?
end
end
SessionsController
class SessionsController < ApplicationController
def new
end
def create
@user = User.find_by(email: params[:session][:email].downcase)
if (@user && @user.authenticate(params[:session][:password]))
log_in @user
flash[:success] = "Welcome back, #{@user.name}!"
params[:session][:remember_me] == '1' ? remember(@user) : forget(@user)
redirect_back_or root_path
else
flash.now[:danger] = 'Invalid email/password combination'
render 'new'
end
end
def destroy
log_out if logged_in?
redirect_to root_url
end
end
StaticPagesController
class StaticPagesController < ApplicationController
def home
if logged_in?
@new_micropost = Micropost.new
@feed_items = current_user.microposts.paginate(page: params[:page])
end
end
def help
end
def about
end
def contact
end
end
UsersController
class UsersController < ApplicationController
before_action :logged_in_user, only: [:edit, :update, :destroy]
before_action :correct_user, only: [:edit, :update]
before_action :admin_user, only: [:destroy]
def show
@user = User.find(params[:id])
@microposts = @user.microposts.paginate(page: params[:page])
end
def new
@user = User.new
end
def index
@users = User.paginate(page: params[:page])
end
def create
@user = User.new(user_params)
if @user.save
log_in @user
flash[:info] = "Welcome to the to-do app, #{@user.name}"
redirect_to @user
else
render 'new'
end
end
def admin
@users = User.paginate(page: params[:page])
end
def destroy
a = User.find(params[:id]).name
User.find(params[:id]).destroy
flash[:success] = "#{a} has been deleted!"
redirect_to users_url
end
def admin_user
redirect_to(root_url) unless current_user.admin?
end
def edit
@user = User.find(params[:id])
end
def update
@user = User.find(params[:id])
if @user.update_attributes(user_params)
flash[:success] = "Profile for @user.name has been updated"
redirect_to(@user)
else
flash[:danger] = "Update Failed."
render 'edit'
end
end
private
def user_params
params.require(:user).permit(:name, :email, :password,
:password_confirmation, :admin)
end
def logged_in_user
unless logged_in?
store_location
flash[:danger] = "You are not logged in. Please log in."
redirect_to login_url
end
end
def correct_user
@user = User.find(params[:id])
if !current_user?(@user)
flash[:danger] = "You are not authorized to visit this page."
redirect_to(root_url)
end
end
end
microposts / index.html.erb
<h1>Filtered Tasks</h1>
<%= will_paginate %>
<% @current_user.microposts.each do |micropost| %>
<p><%= truncate(micropost.content, length: 50) %></p>
<p><small>Tags: <%= raw micropost.tags.map(&:name).map { |t| link_to t, tag_path(t) }.join(', ') %></small></p>
<span class="timestamp">
Posted <%= time_ago_in_words(micropost.created_at) %> ago.
<% if current_user?(micropost.user) %>
<%= link_to "Done", micropost_path(micropost), method: :delete, data: { confirm: "Keep up the good work!" } %>
<% end %>
</span>
<br><br>
<% end %>
<%= will_paginate %>
Модель микросообщений
class Micropost < ApplicationRecord
belongs_to :user
has_many :taggings
has_many :tags, through: :taggings, :dependent => :delete_all
default_scope -> { order(created_at: :desc) }
validates :user_id, presence: true
validates :content, presence: true, length: {maximum: 140 }
attr_accessor :tag_list
def self.tagged_with(name)
Tag.find_by!(name: name).microposts
end
def self.tag_counts
Tag.select('tags.*, count(taggings.tag_id) as count')
.joins(:taggings).group('taggings.tag_id')
end
def tag_list
tags.map(&:name).join(', ')
end
def tag_list=(names)
self.tags = names.split(',').map do |n|
Tag.where(name: n.strip).first_or_create!
end
end
end
Кто-нибудь знает, как работает система тегирования и, в частности, почему tagged_with возвращает все микросообщения?Сообщите мне, если нужна дополнительная информация.Большое спасибо заранее.