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POWhy am I getting "unrecognized selector" errors when subclassing GDataEntryBase from Google Data Objective-C Client Library?
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copied!<p>I've built the <a href="http://code.google.com/p/gdata-objectivec-client/" rel="nofollow">Google Data APIs Objective-C Client Library</a> and have it linking and working with my application (incl. GTMOAuth2) and can pull data back. I need to work with the <a href="https://developers.google.com/google-apps/provisioning/" rel="nofollow">Provisioning API</a> (still XML-only) so am building out the additions I need within my own application. I think I have finally figured out how all of this works and I'm <em>very</em> close to reading custom elements, but I'm missing something.</p> <p>I've subclassed <code>GDataServiceGoogle</code>, <code>GDataEntryBase</code>, and <code>GDataFeedBase</code> and am getting correct data back. I'm starting with a simple & straightforward element type: <code>quota</code>. In the Users feed, the quota element looks like this:</p> <pre><code><apps:quota limit="2048"/> </code></pre> <p>So, I've added the following value construct:</p> <pre><code>@interface GDataQuotaProperty : GDataValueConstruct <GDataExtension> + (NSString *)extensionElementURI; + (NSString *)extensionElementPrefix; + (NSString *)extensionElementLocalName; @end @implementation GDataQuotaProperty + (NSString *)extensionElementURI { return kGDataNamespaceGApps; } + (NSString *)extensionElementPrefix { return kGDataNamespaceGAppsPrefix; } + (NSString *)extensionElementLocalName { return @"quota"; } @end </code></pre> <p>And I've added the following methods to my <code>GDataEntryBase</code> subclass:</p> <pre><code>- (GDataQuotaProperty *)quota; - (void)setQuota:(GDataQuotaProperty *)val; </code></pre> <p>Implemented as follows:</p> <pre><code>- (GDataQuotaProperty *)quota { return [self objectForExtensionClass:[GDataQuotaProperty class]]; } - (void)setQuota:(GDataQuotaProperty *)val { [self setObject:val forExtensionClass:[GDataQuotaProperty class]]; } </code></pre> <p>As <a href="http://code.google.com/p/gdata-objectivec-client/source/browse/trunk/Source/BaseClasses/GDataObject.h" rel="nofollow">documented in the comments in <code>GDataObject.h</code></a> (and I've been working off of <code>GDataServiceGoogleCalendar</code>, <code>GDataEntryCalendar</code>, and <code>GDataFeedCalendar</code> as a reference implementation), in my <code>GDataBaseEntry</code> subclass I've implemented <code>addExtensionDeclarations</code> as follows:</p> <pre><code>- (void)addExtensionDeclarations { [super addExtensionDeclarations]; Class entryClass = [self class]; // User extensions [self addExtensionDeclarationForParentClass:entryClass childClasses:[GDataQuotaProperty class], nil]; } </code></pre> <p>However, when I try to call the <code>quota</code> method as follows in my callback:</p> <pre><code>GDataTextConstruct *titleTextConstruct = [user title]; NSString *title = [titleTextConstruct stringValue]; GDataQuotaProperty *quotaConstruct = [user quota]; NSString *quota = [quotaConstruct stringValue]; </code></pre> <p>I get an exception and this error:</p> <pre><code>2012-11-19 12:42:22.667 Google Apps Open Directory Sync[47679:903] -[GDataEntryBase quota]: unrecognized selector sent to instance 0x2836d0 </code></pre> <p>In the above example I do get the user's name (the element's <code>title</code>) back correctly without error. Also, the <code>user</code> object is actually of the type of my <code>GDataEntryBase</code> subclass, not <code>GDataEntryBase</code> itself (verified in the debugger), plus the <code>classForEntries</code> method in my <code>GDataFeedBase</code> subclass correctly returns the class of my subclass of <code>GDataEntryBase</code>) so between the two of those it <em>really</em> has to be the correct class. I have a breakpoint on my <code>GDataEntryBase</code> subclass's <code>quota</code> method which is never being tripped, so what am I missing here?</p> <p>As mentioned, I've been comparing with the Service/Feed/Entry implementation for Calendar (specifically the <code>accessLevel</code> & <code>color</code> elements and methods) and am just not seeing what I'm missing.</p> <p>Thanks in advance for any assistance you can provide.</p>

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