[yast-devel] WebYaST: how to pass empty string to rest-service?

16 Sep 2009

      Hi,
in administrator module I have a POST request from client that contains the 
information about root password and mail aliases. Sometimes I would like to 
pass an empty value (for mail aliases, to reset it to no alias) and to 
distinguish the empty value from nil (nil has a meaning do not try to save 
this, while empty means save empty).

So, for example I have this object in webclient controller:
@administrator.password = nil
@administrator.aliases = ""

and I'm calling POST with @administrator.save

However, on the server part, I get this as parameters:

{"format"=>"xml", "action"=>"create", "administrator"=>{"aliases"=>nil, "password"=>nil}, "controller"=>"administrator"}

So both values are set to nil.
When debugging, we saw that the RAW_POST_DATA has a value 

"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<administrator>\n  
<aliases></aliases>\n  </password>\n</administrator>\n"

which is converted by from_xml this way even if aliases tag looks differently 
from password tag:

Hash.from_xml("<?xml?>\n<administrator>\n  <aliases></aliases>\n  </password>\n</administrator>\n")
{"administrator"=>{"aliases"=>nil, "password"=>nil}}

It would work if the request would contain 

<aliases type='string'></aliases> instead of <aliases></aliases>,

however I don't know how to achieve this; using

xml.aliases aliases, {:type => "string"}

in models/administrator.rb's to_xml doesn't seem to help.

Jiri

-- 
Jiri Suchomel

SUSE LINUX, s.r.o.                            e-mail: jsuchome@suse.cz
Lihovarská 1060/12                            tel: +420 284 028 960
190 00 Praha 9, Czech Republic                http://www.suse.cz
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Jiří Suchomel

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Martin Vidner

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