为什么 article.tag_list 不显示标签？

Question

我在 Gemfile 中添加了 gem 'acts-as-taggable-on' -v 2.3.1。 Rails 版本 3.2.13，Ruby -v 1.9.3

在article.rb,

class Article < ActiveRecord::Base
  acts_as_taggable_on :tags
  has_many :comments, dependent: :destroy

  validates :title, presence: true,
                length: { minimum: 5 }
end

在articles_controller.rb,

class ArticlesController < ApplicationController

before_filter :authenticate_author!, except: [:index, :show]

def index
  myarray = Article.all
  @articles = Kaminari.paginate_array(myarray).page(params[:page]).per(10)
end

def show
  @article = Article.find(params[:id])
end

def new
  @article = Article.new
end

def create
  @article = Article.new(article_params)

  if @article.save
    redirect_to @article
  else
    render 'new'
  end
end

def edit
  @article = Article.find(params[:id])
end

def update
  @article = Article.find(params[:id])

  if @article.update_attributes(article_params)
    redirect_to @article
  else
    render 'edit'
  end
end

def destroy
  @article = Article.find(params[:id])
  @article.destroy

  redirect_to articles_path
end

private

def article_params
  params.require(:article).permit(:title, :text, :tag_list => [])
end

end

在articles/_form.html.erb

<div class="field">
  <%= f.label :tag_list, "Tags (separated by commas)" %><br />
  <%= f.text_field :tag_list %>
</div>

安装acts-on-taggable-gem,

后我运行以下命令

rails generate acts_as_taggable_on:migration
rake db:migrate

在articles/index.html.erb

<% @articles.each do |article| %>
  <tr>
    <td><%= article.title %></td>
    <td><%= article.text %></td>
    <td><%= article.tag_list %></td>
    <td><%= link_to 'Show', article_path(article) %></td>
    <% if author_signed_in? %> 
      <td><%= link_to 'Edit', edit_article_path(article) %></td>
      <td><%= link_to 'Destroy', article_path(article),
            method: :delete,
            data: { confirm: 'Are you sure?' } %></td>
    <% end%>
  </tr>
<% end %>

标签没有显示在索引页中。但如果我这样做，

article = Article.new(:title => "Awesome")
article.tag_list = "awesome, cool"
article.save

t运行saction 被提交并且标签显示在浏览器上。

为什么标签没有保存并显示在索引页中？

Answer 1

标签列表是一个数组，这意味着您需要'loop'提取数据。每当我使用 acts_as_taggable 时，我都会通过循环运行来提取标签。像下面这样的东西应该可以工作：

<% @articles.each do |article| %>
  <tr>
    <td><%= article.title %></td>
    <td><%= article.text %></td>

    <td>
        <% article.tag_list.each do |tag| %>
                <%= tag %>
        <% end %>
    </td>

    <td><%= link_to 'Show', article_path(article) %></td>
    <% if author_signed_in? %> 
      <td><%= link_to 'Edit', edit_article_path(article) %></td>
      <td><%= link_to 'Destroy', article_path(article),
            method: :delete,
            data: { confirm: 'Are you sure?' } %></td>
    <% end%>
  </tr>
<% end %>

为什么 article.tag_list 不显示标签？

Why doesn't article.tag_list display the tags?

acts-as-taggable-on

ruby-1.9.3

ruby-on-rails-3.2

ruby-on-rails-4