Using 1.5.8, we've been tracking down an issue that results in attributes/instance variables being added to NilClass?.
This manifests itself initially when encoding the response, as BasetypeFactory?_#obj2soap has an issue with a nil that has instance variables. This ends up with the error:
SOAP::Mapping::MappingError (Cannot map AdKeywordStruct to SOAP/OM.)
Tracking this down further, it appears that those instance variables are being added to NilClass? when the request is being decoded.
In particular, when RubytypeFactor#unknownstruct2obj? calls Mapping#create_empty_object, an exception gets thrown:
#<TypeError: allocator undefined for Struct>
This exception is rescued, leaving the obj variable as nil, when is then passed to setiv2obj, which then goes ahead and transfer the attributes of the node to instance variables of obj. Since obj is nil, this effectively corrupts NilClass?.
The request body that is resulting in this behavior is:
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:ns1="http://api-secure.sponsoredlistings.ask.com/api/v3"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:UpdateAdKeywordState><token
xsi:type="xsd:string">eef4ab456a9631957f272a7aaca20444</token><ad_keyword
xsi:type="SOAP-ENC:Struct"><ad_id
xsi:type="xsd:int">603504189</ad_id><match_type_id
xsi:type="xsd:int">2</match_type_id><ad_keyword_state
xsi:type="xsd:string">off</ad_keyword_state><keyword
xsi:type="xsd:string">[Contextual]</keyword><max_cpc
xsi:nil="xsd:double">+0.01</max_cpc><ad_keyword_id
xsi:type="xsd:int">262439024</ad_keyword_id></ad_keyword></ns1:UpdateAdKeywordState></SOAP-ENV:Body></SOAP-ENV:Envelope>
