Hello,

It looks like you are nesting one too many maps deep. You shouldn't need to 
explicitly set the :xsi_type of the AdGroupCriterionOperation, since 
there's only one type of operation accepted by the AdGroupCriterionService.

Notice how your :operand in the operation variable also has an :operand 
specified.

Try this:
ad_group_criterion = {
:xsi_type => 'BiddableAdGroupCriterion',
:ad_group_id => 'xxxxxx',
:criterion => {
   :xsi_type => 'Keyword',
   :match_type => 'BROAD',
   :id => 'xxxxxx'
}
}
operation = {
  :operator => 'ADD',
  :operand => ad_group_criterion
}

Regards,
Mike, AdWords API Team

On Wednesday, June 24, 2015 at 10:17:37 AM UTC-4, Johnny wrote:
>
> I'm trying to create an experiment via the API using the ruby client 
> library. Creating the experiment works ok but when I try to add a keyword I 
> get:
>
> /home/johnny/.rvm/gems/ruby-2.1.6/gems/google-ads-common-0.9.8/lib/ads_common/savon_service.rb:113:in
>  
> `handle_errors': Unknown exception with error: Unmarshalling Error: 
> cvc-elt.4.3: Type 'AdGroupCriterionOperation' is not validly derived from 
> the type definition, 'AdGroupCriterion', of element 'operand'. 
>  (AdsCommon::Errors::ApiException)
> from 
> /home/johnny/.rvm/gems/ruby-2.1.6/gems/google-ads-common-0.9.8/lib/ads_common/savon_service.rb:83:in
>  
> `execute_action'
> from 
> /home/johnny/.rvm/gems/ruby-2.1.6/gems/google-adwords-api-0.13.2/lib/adwords_api/v201409/ad_group_criterion_service.rb:25:in
>  
> `mutate'
> from ../adwords_play.rb:52:in `<main>'
>
> Any ideas why? The relevant part of my code follows.
>
> ad_group_criterion_srv = adwords.service(:AdGroupCriterionService, 
> API_VERSION)
> ad_group_criterion = {
> :xsi_type => 'AdGroupCriterionOperation',
> :operand => {
> :xsi_type => 'BiddableAdGroupCriterion',
> :ad_group_id => 'xxxxxx',
> :criterion => {
>    :xsi_type => 'Keyword',
>    :match_type => 'BROAD',
>    :id => 'xxxxxx'
> }
> }
> }
> operation = {
>   :operator => 'ADD',
>   :operand => ad_group_criterion
> }
>
> # Update criterion.
> response = ad_group_criterion_srv.mutate([operation])
>
>

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