Re: Loosing assertions

Neil Stansbury wrote:
> Hi all,
> 
> I am loading a number of datasources from both local files and remote 
> URLs into a composite datasource.
> 
> The individual datasources are retrieved via:
> 
> nsIRDFService.GetDataSource( nsIIOService.NewfileUri )
> or
> nsIRDFService.GetDataSource( http URL )
> 
> I am now trying to assert changes manually into the composite ds rather 
> than refreshing the entire remote datasources.
> 
> 
> The odd thing is when I assert() into the composite DS, I know the 
> assertion works initially as I have CSS selectors that change as soon as 
> the assertion completes. But when I check the value immediately after, 
> it is as it was.
> 
> 
> 
> For example:
> 
> var nsIRDFService = 
> Components.classes["@mozilla.org/rdf/rdf-service;1"].getService();
> 
> var nsIRDFService =
>   nsIRDFService.QueryInterface(Components.interfaces.nsIRDFService);
> 
> var subject =
>   nsIRDFService.GetResource(subject);
> 
> var predicate =
>   nsIRDFService.GetResource(predicate);
> 
> var object = CompDS.GetTarget(subject, predicate, true);
> 
> var value = object.QueryInterface(Components.interfaces.nsIRDFLiteral);
> 
> alert( value );
> 
> 
> value = "new value"
> 
> var literal = nsIRDFService.GetLiteral(value);
> 
> CompDS.Assert(subject, predicate, literal, true);
> 
> // Check
> object = CompDS.GetTarget(subject, predicate, true);
> value = object.QueryInterface(Components.interfaces.nsIRDFLiteral);
> 
> alert( value );        // Still old value
> 

you end up with

  foo -> bar -> lit1
     |-> bar -> lit2

This does make foo -> bar -> lit2 true, but the first target is still lit1.

Do you want to Change instead of Assert? Or use GetTargets and pick the 
right one.

Axel