Question

我想在一个数据库列中使用唯一的玩家ID存储多个问题和答案。

数据库列player_answer应该看起来像 -

player_id |问题|答案

1 |印度|新德里

1 |美国|华盛顿特区。

1 |英国|伦敦

......等等。

这是我的/views/player_answers/_form.html.erb

<%= form_for(@player_answer) do |f| %>
  <% if @player_answer.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@player_answer.errors.count, "error") %> prohibited this player_answer from being saved:</h2>

      <ul>
      <% @player_answer.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :player_id %><br />
    <%= f.text_field :player_id, :readonly => true, :value => Player.find(params[:playerid]).id %>
    <!--<#%= f.text_field :player_id %>-->
  </div>

<% (1..10).each do |i| puts i %>

<table>
  <tr>

    <td>
  <div class="field">

    <%= f.label :question_id %><br />
    <%= f.text_field :question_id %>

  </div>
    </td>
    <td>
  <div class="field">
    <%= f.label :answer %><br />
    <%= f.text_field :answer, :readonly => true, :value => params[:playeranswerid].to_i %>
  </div>
      </td>

  </tr>
</table>


<% end  %>


  <div class="field">
    <%= f.label :answer_after_self_scoring %><br />
    <%= f.text_field :answer_after_self_scoring %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

这是我的player_answers_controller.rb文件代码 - class PlayerAnswersController＆lt; ApplicationController的 #GET / player_answers #GET /player_answers.xml def指数 @player_answers = PlayerAnswer.all

respond_to do |format|
  format.html # index.html.erb
  format.xml  { render :xml => @player_answers }
end

端

＃GET / player_answers / 1 #GET /player_answers/1.xml def show @player_answer = PlayerAnswer.find（params [：id]）

respond_to do |format|
  format.html # show.html.erb
  format.xml  { render :xml => @player_answer }
end

端

＃GET / player_answers / new #GET /player_answers/new.xml def new @player_answer = PlayerAnswer.new

respond_to do |format|
  format.html # new.html.erb
  format.xml  { render :xml => @player_answer }
end

端

#GET / player_answers / 1 /编辑 def编辑 @player_answer = PlayerAnswer.find（params [：id]）端

#POST / player_answers #POST /player_answers.xml def创建 @player_answer = PlayerAnswer.new（params [：player_answer]）

respond_to do |format|
  if @player_answer.save
    format.html { redirect_to(@player_answer, :notice => 'Player answer was successfully created.') }
    format.xml  { render :xml => @player_answer, :status => :created, :location => @player_answer }
  else
    format.html { render :action => "new" }
    format.xml  { render :xml => @player_answer.errors, :status => :unprocessable_entity }
  end
end

端

＃PUT / player_answers / 1 #PUT /player_answers/1.xml def更新 @player_answer = PlayerAnswer.find（params [：id]）

respond_to do |format|
  if @player_answer.update_attributes(params[:player_answer])
    format.html { redirect_to(@player_answer, :notice => 'Player answer was successfully updated.') }
    format.xml  { head :ok }
  else
    format.html { render :action => "edit" }
    format.xml  { render :xml => @player_answer.errors, :status => :unprocessable_entity }
  end
end

端

#DELETE / player_answers / 1 #DELETE /player_answers/1.xml def destroy @player_answer = PlayerAnswer.find（params [：id]） @ player_answer.destroy

respond_to do |format|
  format.html { redirect_to(player_answers_url) }
  format.xml  { head :ok }
end

端端

请让我知道如何继续解决这个问题。

P.S。我刚刚开始使用rails，这可能是我正在进行的第一个项目。请帮忙!!

Answer 1

如果要在一列中添加多个数据，请使用'serialize'。

根据您的喜好，这会将所有内容存储为哈希或数组。

请参阅此处的文档：http://api.rubyonrails.org/classes/ActiveRecord/Base.html

Answer 2

从你的问题中不清楚你有什么麻烦

当您尝试使用相同的player_id创建新记录时是否会出错？如果是这样 - 确保player_id没有uniq索引或不是主键

为你的布局创建表/模型试试这个：

script/generate migration create_player_answers player_id:integer question:string answer:string

或rais generate - 因为您没有指定您正在使用的导轨版本

如何使用rails在一个数据库列中保存多个字段

2 个答案: