This would need to be provided by the tooling; I don't think it's something that's even remotely possible at runtime (unless you stored the field name in a Fact and used reflection on the RHS). That said (and you're going to guess my next comment) this is not provided in the guided editors. Depending on how complex your DSLs are and whether users need to combine DSL Sentences; IDK if a "cheat" works: [when]Do something with {field} and {value}=$f : Fact({field}=={value} then $f.{field} = {value} I've not tried it; nor know whether it fits your requirements.. but a hack worth trying? On 3 June 2013 17:40, stephen.masters <stephen.masters(a)me.com&gt; wrote: Hi folks, Is there a decent way to set a value in the LHS of a rule so that it's available in the RHS? Reason being I have a DSL driving the guided rules editor which will pluck out the value of a field, where the name of that field is driven by a drop down menu enumeration. A change I now have would be a lot easier if I could assign a string to a variable in the LHS, which could be read by the RHS. Otherwise I might need to extend the RHS DSLs to include the same enumeration as the LHS. Which looks a bit redundant for a business user wondering why the need to write the same thing twice. Any thoughts? Steve Sent from Samsung Mobile _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

The usual (and only reasonable way) to "set" a variable in the LHS is to bind it to a Drools variable, including things like: ... $x : String() from /* expression here */ ... any usage of the "=" operator is generally suspicious.. but I'm not sure I have understood your use case completely.. :) On 06/04/2013 05:59 PM, Stephen Masters wrote: > Thanks for the cheat idea Mike. I wasn't really expecting any help from the tooling itself. Just hoping that there might be some trickery within the DSL that I could try, to generate some code which would set up a variable for me. > > Unfortunately I do need to combine LHS sentences and multiple RHS sentences, so your idea isn't really an option in this case. :( > > As it is I have created a little enumeration in the RHS sentence, and it's not looking too bad. At least, with some selective wording, it doesn't look completely redundant! > > Steve > > > > On 4 Jun 2013, at 16:33, Michael Anstis <michael.anstis(a)gmail.com&gt; wrote: > >> This would need to be provided by the tooling; I don't think it's something that's even remotely possible at runtime (unless you stored the field name in a Fact and used reflection on the RHS). >> >> That said (and you're going to guess my next comment) this is not provided in the guided editors. Depending on how complex your DSLs are and whether users need to combine DSL Sentences; IDK if a "cheat" works: >> >> [when]Do something with {field} and {value}=$f : Fact({field}=={value} then $f.{field} = {value} >> >> I've not tried it; nor know whether it fits your requirements.. but a hack worth trying? >> >> >> On 3 June 2013 17:40, stephen.masters <stephen.masters(a)me.com&gt; wrote: >> Hi folks, >> >> Is there a decent way to set a value in the LHS of a rule so that it's available in the RHS? >> >> Reason being I have a DSL driving the guided rules editor which will pluck out the value of a field, where the name of that field is driven by a drop down menu enumeration. >> >> A change I now have would be a lot easier if I could assign a string to a variable in the LHS, which could be read by the RHS. Otherwise I might need to extend the RHS DSLs to include the same enumeration as the LHS. Which looks a bit redundant for a business user wondering why the need to write the same thing twice. >> >> Any thoughts? >> >> Steve >> >> >> >> >> Sent from Samsung Mobile >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users