Ruby on Rails中的数据库查询

Question

我试图在应用程序中执行数据库搜索，但是，我一直无法使搜索正常工作。

在索引页面中，我可以选择搜索或显示数据库中的所有项目，但似乎总是调用return all而不是搜索。如果有人搜索，我想只在搜索完成时显示搜索到的项目。

但是，我遇到了一些问题。

articles_controller.rb：

class ArticlesController < ApplicationController 
    def index 
    if params[:id] 
     fun = Article.find_by(title: params[:id].search) 
    else 
     @articles = Article.all 
    end 
    end 

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

    def new 
    @article = Article.new 
    end 

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

    def create 
    @article = Article.new(params.require(:article).permit(:title, :text)) 

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

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

    if @article.update(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) 
    end 
end 

article.rb：

class Article < ActiveRecord::Base 

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

    def self.search(search) 
     if :search 
     Article.where('tite LIKE ?', "%#{search}%") 
     else 
     Article.all 
     end 
    end 

end 

index.html.erb：

<h1>Listing articles</h1> 

<%= link_to 'New article', new_article_path %> 

<table> 
    <tr> 
    <th>Title</th> 
    <th>Text</th> 
    <th colspan="3"></th> 
    </tr> 

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


    <%= form_tag articles_path, :method => 'get' do %> 
    <p> 
     <%= text_field_tag :search, params[:search] %> 
     <%= submit_tag "Search", :title => nil %> 
    </p> 
<% end %> 

</table> 

后端DB：

Started GET "/articles?search=asdfa&commit=Search&utf8=%E2%9C%93" for ::1 at 2016-03-14 15:01:12 -0400 
Processing by ArticlesController#index as HTML 
    Parameters: {"search"=>"asdfa", "commit"=>"Search", "utf8"=>"✓"} 
    Article Load (0.1ms) SELECT "articles".* FROM "articles" 
    Rendered articles/index.html.erb within layouts/application (1.4ms) 
Completed 200 OK in 19ms (Views: 18.6ms | ActiveRecord: 0.1ms) 

最新的错误/不正确调用是：

Started GET "/assets/application.self-3b8dabdc891efe46b9a144b400ad69e37d7e5876bdc39dee783419a69d7ca819.js?body=1" for ::1 at 2016-03-14 15:39:25 -0400 


Started GET "/articles?search=asdfa&commit=Search&utf8=%E2%9C%93" for ::1 at 2016-03-14 15:39:40 -0400 
Processing by ArticlesController#index as HTML 
    Parameters: {"search"=>"asdfa", "commit"=>"Search", "utf8"=>"✓"} 
    Article Load (0.1ms) SELECT "articles".* FROM "articles" 
    Rendered articles/index.html.erb within layouts/application (1.3ms) 
Completed 200 OK in 18ms (Views: 17.2ms | ActiveRecord: 0.1ms) 

我究竟在做什么错？我该如何修复/完成这项工作？

Answer 1

你已经在你的模型中定义search方法，但你是不是在你的控制器使用它：

def index 
    @articles = Article.search params[:search] 
end 

在你的模型，你有一些逻辑错误（符号:search代替search变量，泰特的代替title）：

def self.search search 
    search.present? ? where('title LIKE ?', "%#{search}%") : all 
end 

Answer 2

在你的控制器，你有：

def index 
    if params[:id] 
     fun = Article.find_by(title: params[:id].search) 
    else 
     @articles = Article.all 
    end 
end 

但是您绝对不会将任何ID通过窗体传递给控制器​​。

例如，您可以更改条件：

if params[:search] 

，然后发现：

Article.find_by(title: params[:search])