Creating template column in guvnor for attribute value?

[dunnlow]

I'm using Guvnor 5.4

I find myself sometimes wanting to use templates to map a string to a metadata value or timer.  For example, based upon a name, set a value for the timeout.  As far as I can tell however, the only way to create a template column in guvnor is to include the column identifier in the LHS.  

For example, I have a basic rule template that checks a name (there is only a "name" column in the template matrix).  Then, I click on options, add a timer and give it a value of "@{timeout}" I get an error - the timeout column does not exist in the template.  However, if I write a dummy expression on the LHS like "foo" not matches timeout, the timeout column is created and everything is great once I set the value.  If I delete the predicate that uses timeout, I get an error again for the timer attribute.

This gets really ugly because I end up having (seemingly) useless predicates.  Is there a clean way to support this functionality?

Thanks,
-J

[manstis]

Hi,

This is somewhere between a bug and an enhancement:

Currently the Template Editor does not support template keys for Metadata or Attributes; i.e. your requirement is an enhancement.

You can however provide literal values formatted as template keys (e.g. @{xx} as you have discovered); i.e. there is a bug.

The enhancement has already been reported here: https://issues.jboss.org/browse/GUVNOR-1907

Please note, with 5.4 you can use a web-guided Decision Table.

These support BRL fragments for columns (i.e. you can define a column that uses any feature in the BRL\Guided Rule Editor or Template Editor) and they already support interpolation of values for both Meta-data and Attributes.

With kind regards,

Mike

On 13 August 2012 18:38, dunnlow <[hidden email]> wrote:

I'm using Guvnor 5.4

I find myself sometimes wanting to use templates to map a string to a
metadata value or timer.  For example, based upon a name, set a value for
the timeout.  As far as I can tell however, the only way to create a
template column in guvnor is to include the column identifier in the LHS.

For example, I have a basic rule template that checks a name (there is only
a "name" column in the template matrix).  Then, I click on options, add a
timer and give it a value of "@{timeout}" I get an error - the timeout
column does not exist in the template.  However, if I write a dummy
expression on the LHS like "foo" not matches timeout, the timeout column is
created and everything is great once I set the value.  If I delete the
predicate that uses timeout, I get an error again for the timer attribute.

This gets really ugly because I end up having (seemingly) useless
predicates.  Is there a clean way to support this functionality?

Thanks,
-J




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