Re: ParamPrepareParamsStack interceptor , how does this work???

[akoo <og...@yahoo.com>]

thanks I think I figured out the problem. I had implemented the model driven
interface, but  had it returning a new Product() object instead. It works
now. 


  
The OP's approach is appropriate when using the param-prepare-params 
pattern.  Sometimes it's essential that the domain objects are 
instantiated/loaded in a prepare method prior to setting their params. 
eg. #1. if it's impossible for S2 to instantiate it (when there's no 
default constructor or an unknown concrete type).
eg. #2.where a parameter is required to load the domain object prior to 
setting its it's params

For the OP:
You haven't indicated whether you're using a getter (getProduct()) or 
ModelDriven<Product>. It appears to me that your problem is unrelated to 
the paramsPrepareParams stack and more related to your parameters name.

The first invocation of the params interceptor will set all params of 
your action (productId, name, color etc).  In this case, a Product does 
not exist but the productId is set.
The prepare method is invoked and your Product created loaded.
The second invocation of the params interceptor will set all params of 
your action again (productid, name, color).  In this case a Product does 
exist, but you're not setting its own parameters.

I suspect you haven't applied the ModelDriven<Product> interface.  You 
need to use that if you want to call your parameter "name".

Otherwise you need a getProduct() method with param names such as 
"product.name" and "product.color".

regards,
 Jeromy Evans


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