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<!DOCTYPE html>
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<title>Railstic</title>
<meta name="author" content="İ. Emre Kutlu">
<meta name="description" content="I’m using the collectiveidea fork of DelayedJob. There are two ways to create a DelayedJob record. First you can use the delay method. Second …">
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<h1><a href="/">Railstic</a></h1>
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<article>
<header>
<h1 class="entry-title"><a href="/2011/08/check-existence-of-delayedjob-records/">Check Existence of DelayedJob Records</a></h1>
<p class="meta">
<time datetime="2011-08-29T03:23:19+03:00" pubdate data-updated="true">Aug 29<span>th</span>, 2011</time>
| <a href="/2011/08/check-existence-of-delayedjob-records/#disqus_thread">Comments</a>
</p>
</header>
<div class="entry-content"><p>I’m using the collectiveidea fork of <a href="http://github.com/collectiveidea/delayed_job" target="_blank">DelayedJob</a>. There are two ways to create a DelayedJob record. First you can use the <code>delay</code> method.</p>
<script src="https://gist.github.com/1177431.js?file=dj_delay.rb"></script>
<p>Second way to create DelayedJob records is custom jobs.</p>
<script src="https://gist.github.com/1177431.js?file=dj_custom_job.rb"></script>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/2011/06/dynamically-defining-methods-with-define_method/">Dynamically Defining Methods with define_method</a></h1>
<p class="meta">
<time datetime="2011-06-11T02:08:08+03:00" pubdate data-updated="true">Jun 11<span>th</span>, 2011</time>
| <a href="/2011/06/dynamically-defining-methods-with-define_method/#disqus_thread">Comments</a>
</p>
</header>
<div class="entry-content"><p>If you have been hacking ruby for a while you should have heard that “Everything is an object”. To understand this concept knowing what a <strong>singleton class</strong> is important. <a href="http://yehudakatz.com/2009/11/15/metaprogramming-in-ruby-its-all-about-the-self/" target="_blank">Yehuda Katz’s post</a> is a good source for it.</p>
<p>My ruby version 1.9.2.</p>
<script src="https://gist.github.com/1009449.js?file=ruby_version.bash"></script>
<p>First I’m going to show you how to add methods to instances by using <code><strong>define_method</strong></code>.</p>
<script src="https://gist.github.com/1009449.js?file=add_instance_methods.rb"></script>
<p>You can also write an instance method to create instance methods. <code><strong>send</strong></code> must be used because <code><strong>define_method</strong></code> is private.</p>
<script src="https://gist.github.com/1009449.js?file=add_instance_methods_by_instance_method.rb"></script>
<p>Write a singleton method to create instance methods.</p>
<script src="https://gist.github.com/1009449.js?file=add_instance_methods_by_singleton_method.rb"></script>
<p>Now it is time to add singleton methods. When we call <code><strong>define_method</strong></code>, it creates an instance method. What we have to do is call <code><strong>define_method</strong></code> on class’ singleton class.</p>
<p>Getting singleton class of a class:</p>
<script src="https://gist.github.com/1009449.js?file=get_singleton_class.rb"></script>
<p>First defining singleton method to create singleton methods.</p>
<script src="https://gist.github.com/1009449.js?file=add_singleton_methods_by_singleton_method.rb"></script>
<p>Then defining instance method to create singleton methods.</p>
<script src="https://gist.github.com/1009449.js?file=add_singleton_methods_by_instance_method.rb"></script>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/2009/06/nested-object-forms-with-has_one-relation/">Nested Object Forms with has_one Relation</a></h1>
<p class="meta">
<time datetime="2009-06-15T15:40:30+03:00" pubdate data-updated="true">Jun 15<span>th</span>, 2009</time>
| <a href="/2009/06/nested-object-forms-with-has_one-relation/#disqus_thread">Comments</a>
</p>
</header>
<div class="entry-content"><p>Rails 2.3 has a good solution for multi model forms. But there is not much examples of how to use<code> <strong>accepts_nested_attributes_for</strong></code> with <code><strong>has_one</strong></code> relation.</p>
<p>Assume that we have a Book model which has one Author.</p>
<script src="http://snipt.net/embed/821f03288846297c2cf43c34766a38f7" type="text/javascript"><!--mce:0--></script>
<br />
<script src="http://snipt.net/embed/02bd92faa38aaa6cc0ea75e59937a1ef" type="text/javascript"><!--mce:1--></script>
<br />
<p>Controller :<script src="http://snipt.net/embed/f0ef6bf2d1b0bc59796999ff717bf149" type="text/javascript"><!--mce:2--></script></p>
<br />
<p>View:</p>
<script src="http://snipt.net/embed/2b2d98bcfa219f53623aa6c1f1301a01" type="text/javascript"><!--mce:3--></script>
<br />
<p>No special action is needed for <strong><code>create</code></strong> method of BooksController, <strong>attr_accessible</strong> is not necessary for Book model. Just don’t forget to add the second parameter (<strong><code>@book</code></strong>) of <strong><code>form_for</code></strong> and build your nested object (@book.build_author).</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/2009/01/tidbit-converting-strings-with-line-feed-to-array/">Tidbit: Converting Strings with Line Feed to Array</a></h1>
<p class="meta">
<time datetime="2009-01-21T10:08:02+02:00" pubdate data-updated="true">Jan 21<span>st</span>, 2009</time>
| <a href="/2009/01/tidbit-converting-strings-with-line-feed-to-array/#disqus_thread">Comments</a>
</p>
</header>
<div class="entry-content"><p>If you have trouble when converting string to array, check if your string includes any line feed (\n). Check how <code>Array("string")</code> behaves:</p>
<pre lang="bash">irb(main):001:0> Array("izzet emre \nkutlu")
=> ["izzet emre \n", "kutlu"]
</pre>
<p>This output is not what most of the people expected. Be careful!</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/2008/12/rails-22-inflector/">Rails 2.2 & Inflector</a></h1>
<p class="meta">
<time datetime="2008-12-14T22:14:52+02:00" pubdate data-updated="true">Dec 14<span>th</span>, 2008</time>
| <a href="/2008/12/rails-22-inflector/#disqus_thread">Comments</a>
</p>
</header>
<div class="entry-content"><p>If you have recently updated to Rails 2.2.2, you may encounter this error when you want to start your application:</p>
<pre lang="bash">/.gem/ruby/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:445:in
`load_missing_constant': uninitialized constant Inflector (NameError)</pre>
<p>As I learned from <a href="http://paulsturgess.co.uk/articles/show/76-load_missing_constant-uninitialized-constant-inflector-when-upgrading-to-ruby-on-rails-222" target="_blank">Paul’s post</a> usage of <code>Inflector</code> class is changed a bit. You can see the difference when you compare the inflections.rb files. Path of the file is <em>yourApp/config/initializers/inflections.rb</em></p>
<p>inflections.rb (Rails 2.1.0)</p>
<pre lang="ruby"> Inflector.inflections do |inflect|
.
.
.
end</pre>
<p>inflections.rb (Rails 2.2.2)</p>
<pre lang="ruby"> ActiveSupport::Inflector.inflections do |inflect|
.
.
.
end</pre>
<p>In my situation changing <code>Inflector</code> to <code>ActiveSupport::Inflector</code> was enough to solve the problem.</p>
</div>
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<a href="/2011/08/check-existence-of-delayedjob-records/">Check Existence of DelayedJob Records</a>
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<a href="/2011/06/dynamically-defining-methods-with-define_method/">Dynamically Defining Methods with define_method</a>
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<a href="/2009/06/nested-object-forms-with-has_one-relation/">Nested Object Forms with has_one Relation</a>
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<a href="/2009/01/tidbit-converting-strings-with-line-feed-to-array/">Tidbit: Converting Strings with Line Feed to Array</a>
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