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    <title>a2338123 (aidvld)</title>
    <link>https://ruby-china.org/a2338123</link>
    <description/>
    <language>en-us</language>
    <item>
      <title>想请教一个 ror 的问题</title>
      <description>&lt;p&gt;&lt;img src="https://l.ruby-china.com/photo/a2338123/2f7eea38-c0cd-48a3-ae35-24f4a0e66235.png!large" title="" alt=""&gt;&lt;/p&gt;

&lt;p&gt;在做 michael hartl 的 railstutorial 教程时出现了一个问题，好像是外键冲突？以下是我的代码&lt;/p&gt;
&lt;pre class="highlight ruby"&gt;&lt;code&gt;&lt;span class="k"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;CreateMicroposts&lt;/span&gt; &lt;span class="o"&gt;&amp;lt;&lt;/span&gt; &lt;span class="no"&gt;ActiveRecord&lt;/span&gt;&lt;span class="o"&gt;::&lt;/span&gt;&lt;span class="no"&gt;Migration&lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="mf"&gt;7.0&lt;/span&gt;&lt;span class="p"&gt;]&lt;/span&gt;
  &lt;span class="k"&gt;def&lt;/span&gt; &lt;span class="nf"&gt;change&lt;/span&gt;
    &lt;span class="n"&gt;create_table&lt;/span&gt; &lt;span class="ss"&gt;:microposts&lt;/span&gt; &lt;span class="k"&gt;do&lt;/span&gt; &lt;span class="o"&gt;|&lt;/span&gt;&lt;span class="n"&gt;t&lt;/span&gt;&lt;span class="o"&gt;|&lt;/span&gt; 
      &lt;span class="n"&gt;t&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;text&lt;/span&gt; &lt;span class="ss"&gt;:content&lt;/span&gt;
      &lt;span class="n"&gt;t&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;references&lt;/span&gt; &lt;span class="ss"&gt;:user&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="ss"&gt;foreign_key: &lt;/span&gt;&lt;span class="kp"&gt;true&lt;/span&gt;
      &lt;span class="n"&gt;t&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;timestamps&lt;/span&gt;
    &lt;span class="k"&gt;end&lt;/span&gt;
    &lt;span class="n"&gt;add_index&lt;/span&gt; &lt;span class="ss"&gt;:microposts&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="ss"&gt;:user_id&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="ss"&gt;:created_at&lt;/span&gt;&lt;span class="p"&gt;]&lt;/span&gt;
  &lt;span class="k"&gt;end&lt;/span&gt;
&lt;span class="k"&gt;end&lt;/span&gt;



&lt;/code&gt;&lt;/pre&gt;</description>
      <author>a2338123</author>
      <pubDate>Sat, 16 Apr 2022 19:31:55 +0800</pubDate>
      <link>https://ruby-china.org/topics/42314</link>
      <guid>https://ruby-china.org/topics/42314</guid>
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