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    copied!<p>I'm the creator of acts_as_api. I tried your use case with a minimal Rails app and it worked for me. Here is an example response in xml:</p> <pre><code>&lt;users type="array"&gt; &lt;user&gt; &lt;first-name&gt;Me&lt;/first-name&gt; &lt;recieved-date type="datetime"&gt;2011-10-07T08:20:02Z&lt;/recieved-date&gt; &lt;/user&gt; &lt;user&gt; &lt;first-name&gt;Me2&lt;/first-name&gt; &lt;actual-date type="datetime"&gt;2011-10-07T08:20:52Z&lt;/actual-date&gt; &lt;/user&gt; &lt;/users&gt; </code></pre> <p>The api template in the model looks like this:</p> <pre><code>api_accessible :test_dates do |t| t.add :first_name t.add :common_date, :as =&gt; :recieved_date, :if =&gt; lambda{|u|u.date_type_code=="RECVD"} t.add :common_date, :as =&gt; :actual_date, :if =&gt; lambda{|u|u.date_type_code=="ARRIV"} end </code></pre> <p>And this is a dump of User.all:</p> <pre><code>[ [0] #&lt;User:0x0000010b859308&gt; { :id =&gt; 1, :first_name =&gt; "Me", :last_name =&gt; "Too", :age =&gt; nil, :active =&gt; nil, :created_at =&gt; Fri, 07 Oct 2011 08:20:19 UTC +00:00, :updated_at =&gt; Fri, 07 Oct 2011 08:20:19 UTC +00:00, :date_type_code =&gt; "RECVD", :common_date =&gt; Fri, 07 Oct 2011 08:20:02 UTC +00:00 }, [1] #&lt;User:0x0000010b858688&gt; { :id =&gt; 2, :first_name =&gt; "Me2", :last_name =&gt; "Too2", :age =&gt; nil, :active =&gt; nil, :created_at =&gt; Fri, 07 Oct 2011 08:20:45 UTC +00:00, :updated_at =&gt; Fri, 07 Oct 2011 08:20:53 UTC +00:00, :date_type_code =&gt; "ARRIV", :common_date =&gt; Fri, 07 Oct 2011 08:20:52 UTC +00:00 } ] </code></pre> <p>Did you check that you use the controller helpers correctly?</p> <pre><code>def index @users = User.all respond_to do |format| format.html # index.html.erb format.xml { render_for_api :test_dates, :xml =&gt; @users, :root =&gt; :users } format.json { render_for_api :test_dates, :json =&gt; @users, :root =&gt; :users } end end </code></pre> <p>I hope this helps. :)</p> <p>Further debugging could include: * What happens if you remove the :if options? * What does 'puts u.date_type_code' say if you put it in the :if options blocks?</p>
 

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