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That would be very useful. It would eliminate a few more places where I've needed the aws if function.<br>
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It would be good to keep the get_ prefix for consistency.<br>
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Id vote for seperate function. Its cleaner.<br>
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Thanks,<br>
Kevin <strong>
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<font face="Tahoma" size="2"><b>From:</b> Lee, Alexis<br>
<b>Sent:</b> Wednesday, November 05, 2014 6:46:43 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> [openstack-dev] [Heat] New function: first_nonnull<br>
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<p class="MsoNormal" style="text-indent:-5.25pt"><span style="font-size:9.5pt; font-family:Consolas; color:black">I’m considering adding a function which takes a list and returns the first</span></p>
<p class="MsoNormal" style="text-indent:-5.25pt"><span style="font-size:9.5pt; font-family:Consolas; color:black">non-null, non-empty value in that list.</span></p>
<p class="MsoNormal" style="text-indent:-5.25pt"><span style="font-size:9.5pt; font-family:Consolas; color:black"> </span></p>
<p class="MsoNormal" style="text-indent:-5.25pt"><span style="font-size:9.5pt; font-family:Consolas; color:black">So you could do EG:</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> some_thing:</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> config:</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> ControlVIP:</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> first_nonnull:</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> - {get_param: ControlVIP}</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> - {get_attr: [ControlVirtualIP, fixed_ips, 0, ip_address]}]}</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black">I’m open to other names, EG “some”, “or”, “fallback_list” etc.</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black">Steve Hardy suggested building this into get_attr or Fn::Select. My feeling</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black">is that those each do one job well right now, I’m happy to take a steer</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black">though.</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black">What do you think please?</span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:9.5pt; font-family:Consolas; color:black">Alexis (lxsli)</span></p>
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