Just to clarify the reason behind this, in Ruby 1.9 { foo:bar } translates into { :foo =&gt; bar }. Since you want a has using constants as keys, the shorthand notation doesn&#39;t work. In other words, your first example translates to:<div>
<br></div><div>psc_options = { :NSMigratePersistentStoresAutomaticallyOption =&gt; NSNumber.numberWithBool(true),</div><div>                        :NSInferMappingModelAutomaticallyOption =&gt; NSNumber.numberWithBool(true) }<br>
<br><div class="gmail_quote">On Sat, Mar 19, 2011 at 7:54 PM, Morgan Schweers <span dir="ltr">&lt;<a href="mailto:cyberfox@gmail.com">cyberfox@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Greetings,<div>I was trying to set up automatic migration, and did this brain-o, which will be obvious to most folks, but stumped me for a little bit:</div><div><br></div><div>







<p>    psc_options = { NSMigratePersistentStoresAutomaticallyOption:NSNumber.numberWithBool(<span>true</span>),</p><p>                    NSInferMappingModelAutomaticallyOption:NSNumber.numberWithBool(<span>true</span>) }</p>


<p>







</p><p>    fail(error) <span>unless</span> @persistentStoreCoordinator.addPersistentStoreWithType(NSSQLiteStoreType,</p>








<p>                                                                  configuration:<span>nil</span>, URL:url,</p>
<p>                                                                  options:psc_options, error:error)</p><p></p><p><span style="font-family:arial;font-size:small"><br>

</span></p><p><span style="font-family:arial;font-size:small">When what I</span><span style="font-family:arial;font-size:small"> should have been doing was something like:</span></p>

</div><div><br></div><div>







<p>    psc_options = {}</p>
<p>    psc_options[NSMigratePersistentStoresAutomaticallyOption] = NSNumber.numberWithBool(<span>true</span>)</p>
<p>    psc_options[NSInferMappingModelAutomaticallyOption] = NSNumber.numberWithBool(<span>true</span>)</p><p>    ...</p><p><br></p><p><span style="font-family:arial;font-size:small">...or even...</span></p>

<p><span style="font-family:arial;font-size:small"><br></span></p><p><span style="font-family:arial;font-size:small"></span></p>

<p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">    psc_options = { NSMigratePersistentStoresAutomaticallyOption =&gt; NSNumber.numberWithBool(<span style="color:rgb(186, 35, 159)">true</span>),</p>


<p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">                    NSInferMappingModelAutomaticallyOption =&gt; NSNumber.numberWithBool(<span style="color:rgb(186, 35, 159)">true</span>) }</p>


<p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"></p><p></p><p><span style="font-family:arial;font-size:small"><br>

</span></p><p><span style="font-family:arial;font-size:small">It&#39;s subtle bugs like these that make me slap my head...</span></p><p><span style="font-family:arial;font-size:small"><br>

</span></p><p><font face="arial" size="2">...but now Core Data automatic migration works!  W00t!</font></p><p><font face="arial" size="2"><br></font></p><font color="#888888">

<p><font face="arial" size="2">--  Morgan</font></p></font><p><font face="arial" size="2"><br></font></p><p><font face="arial" size="2">p.s. If you&#39;re trying to do Core Data migration, I found this article particularly useful: <a href="http://www.timisted.net/blog/archive/core-data-migration/" target="_blank">http://www.timisted.net/blog/archive/core-data-migration/</a></font></p>


<p><font face="arial" size="2"><br></font></p></div>
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<br></blockquote></div><br></div>