Pastable version of Dynamic migrations for rails

<div style="overflow:auto;border:solid 1px #ccc;background:#000;color:#F8F8F8">
          <div class="section">
            
            <pre style="float:left;margin:0 10px;border-right:0;color:#666;">1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26</pre>
            <pre class="sunburst"><span style="color:#E28964;">require</span> <span style="color:#65B042;"><span style="color:#65B042;">'</span>erb<span style="color:#65B042;">'</span></span>
<span style="color:#E28964;">class</span> <span style="text-decoration:underline;">ClientMigrator</span>
  <span style="color:#E28964;">def</span> <span style="color:#89BDFF;">self.create</span>(<span style="color:#3E87E3;">fields</span>)
    erb_migration <span style="color:#E28964;">=</span> <span style="color:#3E87E3;">ERB</span>.<span style="color:#89BDFF;">new</span> <span style="color:#65B042;"><span style="color:#65B042;">&lt;&lt;-EOS</span></span>
<span style="color:#65B042;">  class AddClients &lt; ActiveRecord::Migration</span>
<span style="color:#65B042;">    def self.up</span>
<span style="color:#65B042;">      create_table :clients do |t|</span>
<span style="color:#65B042;">        &lt;% fields.each do |name, type| %&gt;t.column :&lt;%= name %&gt;, :&lt;%= type %&gt;</span>
<span style="color:#65B042;">        &lt;% end %&gt;</span>
<span style="color:#65B042;">      end</span>
<span style="color:#65B042;">    end</span>
<span style="color:#65B042;"></span>
<span style="color:#65B042;">    def self.down</span>
<span style="color:#65B042;">      drop_table :clients</span>
<span style="color:#65B042;">    end</span>
<span style="color:#65B042;">  end</span>
<span style="color:#65B042;">EOS</span>
<span style="color:#65B042;">    File.open(&quot;db/migrate/003_add_clients.rb&quot;, &quot;w+&quot;) do |f|</span>
<span style="color:#65B042;">      f.puts erb_migration.result(binding)</span>
<span style="color:#65B042;">    end</span>
<span style="color:#65B042;">    `rake db:migrate`</span>
<span style="color:#65B042;">  end</span>
<span style="color:#65B042;">end</span>
<span style="color:#65B042;"></span>
<span style="color:#65B042;"># Example call</span>
<span style="color:#65B042;">ClientMigrator.create(:name =&gt; :string, :phone =&gt; :string)</span>
</pre>
          </div>
        </div>

<a href="http://refactormycode.com/codes/78-dynamic-migrations-for-rails" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://refactormycode.com/images/small_logo.gif" style="border:0" /></a>

counter free hit invisible