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<TITLE>practical example of migrating from services to utilities</TITLE>
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<P><FONT SIZE=2 FACE="Arial">Hello All,</FONT>
<BR> <FONT SIZE=2 FACE="Arial">I have a method which is working well in zope3.0 but its not working well in Zope3.1 c2 version.</FONT>
<BR> <FONT SIZE=2 FACE="Arial">I am new to zope3 framework.I think services have no support in zope3.1.what do i need to do to make it work.</FONT>
<BR> <FONT SIZE=2 FACE="Arial">I think i have to use either adpaters or utilities for this task.</FONT>
<BR> <FONT SIZE=2 FACE="Arial">Somebody please send me a cod snippet to make it work.</FONT>
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<P> <FONT SIZE=2 FACE="Arial">I am putting my code snippet below</FONT>
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<P> <FONT SIZE=2 FACE="Arial">from zope.app.publisher.browser import BrowserView</FONT>
<BR> <FONT SIZE=2 FACE="Arial">from zope.app.exception.interfaces import UserError</FONT>
<BR> <FONT SIZE=2 FACE="Arial">from zope.app.pluggableauth.interfaces import IPluggableAuthentication</FONT>
<BR> <FONT SIZE=2 FACE="Arial">from zope.app.securitypolicy.interfaces import IPrincipalRoleManager</FONT>
<BR> <FONT SIZE=2 FACE="Arial">_ = MessageIDFactory('mynewsite')</FONT>
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<P> <FONT SIZE=2 FACE="Arial">from mynewsite.interfaces import ISignupPrincipalSource</FONT>
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<P> <FONT SIZE=2 FACE="Arial">def _getPrincipalSource(self):</FONT>
<BR> <FONT SIZE=2 FACE="Arial">#</FONT><FONT COLOR="#FF0000" SIZE=2 FACE="Arial"> I am getting error at below place when signing up</FONT>
<BR> <FONT COLOR="#0000FF" SIZE=2 FACE="Arial">pluggableauth = zapi.getService(zapi.servicenames.Authentication,context=self.context)</FONT>
<BR> <FONT SIZE=2 FACE="Arial">if not IPluggableAuthentication.providedBy(pluggableauth):</FONT>
<BR> <FONT SIZE=2 FACE="Arial">raise LookupError, "Signup requires a pluggableauth instance."</FONT>
<BR> <FONT SIZE=2 FACE="Arial">for principal_source in pluggableauth.values():</FONT>
<BR> <FONT SIZE=2 FACE="Arial">if ISignupPrincipalSource.providedBy(principal_source):</FONT>
<BR> <FONT SIZE=2 FACE="Arial">return principal_source</FONT>
<BR> <FONT SIZE=2 FACE="Arial">raise TypeError, "Signup requires a SignupPrincipalSource."</FONT>
<BR> <FONT SIZE=2 FACE="Arial">Thanks in advance</FONT>
<BR><FONT SIZE=2 FACE="Arial">Regards</FONT>
<BR><FONT SIZE=2 FACE="Arial">-Nagendra Kumar</FONT>
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