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From "Jaron Schut (JIRA)" <j...@apache.org>
Subject [jira] Created: (WW-3140) <s:select> converts the "listKey" to String before comparing to the Object in "value"
Date Tue, 26 May 2009 16:16:43 GMT
<s:select> converts the "listKey" to String before comparing to the Object in "value"
-------------------------------------------------------------------------------------

                 Key: WW-3140
                 URL: https://issues.apache.org/struts/browse/WW-3140
             Project: Struts 2
          Issue Type: Improvement
          Components: Plugin - Tags
    Affects Versions: 2.0.6
         Environment: Jetty, all OS'es
            Reporter: Jaron Schut


Trying to get a populated and preselected select tag to work. Well, countries is a list of
country objects and country is a singular object of the preselected country. Data comes from
hibernate so are identified by Long objects:
<s:select list="countries" name="countryId" listKey="id" listValue="displayLabel" value="country.id"
/>

Now the preselecting does not work because the tag converts the listKey, which is a Long object
to a string before calling the equals method on the Long object in the value. So a Long object
and a String object are never equal.

Changing the tag to:
<s:select list="countries" name="countryId" listKey="id" listValue="displayLabel" value="%{country.id}"
/>
Still does not correctly preselect the value because struts2 call Long.toString() 2 separate
times and then compares the result by reference. Which obviously is String != String.

Conclusion: <s:select> tag is not able to correctly compare 2 objects that are the same
nor correctly compare a single object because it creates 2 new strings that apparently are
not compared by value but only by reference?

PS: changing the tag to:
<s:select list="countries" name="countryCode" listKey="countryCode" listValue="displayLabel"
value="country.countryCode" />
Did work correctly. Since but the list of countries and the singular country all come from
hibernate. The tag ends up comparing 2 exactly the same languageCode Strings (Same instance)
to correctly.


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