[rules-users] Double Handling

[Wolfgang Laun]

I guess we'll have to see class IndividualDecision, at least everything in
connection with that loanToValue: field declaration and getter and setter.
-W



2010/4/12 Ade Timi <adeyinka.timi at nathean.com>

>  This is precisely how I expect it to be expressed. When I express in this
> way I get this error message:
>
>
>
> BuildError: Unable to create Field Extractor for 'loanToValue' of
> '[ClassObjectType class=com.nathean.rules.IndividualDecision]' in rule 'G2
> Equity in Asset'
>
>
>
> even though it is a variable in my IndividualDecision class. I have 3 other
> rule files that have expression in this simple manner and they produce no
> errors and are fine.
>
> But for this, It only lets me use eval or have something like this:
>
> *rule* "G2 Equity in Asset"
>
>       *ruleflow-group* "goods"
>
>       *when*
>
>             $d : IndividualDecision()
>
>             Individual($d.loanToValue < 85.0)
>
>       *then*
>
>             …
>
>             //System.out.println((Double.valueOf("85")).doubleValue());
>
>             System.out.println("loanToValue: " + ($d.getLoanToValue()));
>
> *End*
>
>
>
> I understand that it is pointless having that 2nd line in the when
> section, but it’s the only way it picks up the variables in the
> IndividualDecision class with no errors. I don’t know why I can’t do this
> with this particular rules file. I am using Eclipse. Could there be some
> drools configuration issue with this file?
>
>
>
> -A
>
>
>  ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Wolfgang Laun
> *Sent:* 12 April 2010 14:30
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Double Handling
>
>
>
> Well, then drop the
>   dialect "mvel"
> and write the pattern as
>    $d : IndividualDecision( loanToVal < 85.0 )
>
> There's no visible need to use mvel.
>
> Or eval: the simplest form for constraints is always best.
>
> -W
>
>
>
> 2010/4/12 Ade Timi <adeyinka.timi at nathean.com>
>
> Many thanks for the response!
>
> Yes it fires when I use 85.0 instead, but it obviously shouldn’t as the
> condition is false. My code now looks like this:
>
>
>
> *rule* "G2 Equity in Asset"
>
>       *ruleflow-group* "goods"
>
>       *dialect* "mvel"
>
>       *when*
>
>             $d : IndividualDecision(*eval*($d.getLoanToValue() < 85.0))
>
>       *then*
>
>             $d.setGoodCount($d.incGoodCount());
>
>             $d.setMessage("0065: G2: Good: Good Equity in Deal");
>
>             //System.out.println((Double.valueOf("85")).doubleValue());
>
>             System.out.println("loanToValue: " + ($d.getLoanToValue()));
>
> *end*
>
>
>
> I still get the print output of 92000.0, which is as I expect but I don’t
> expect the rule to be fired at all. The weird thing is that when I change
> the condition to ‘>’ which is the true condition it never fires! I’m at a
> loss as to why this is happening.
>
>
>
> - Ade
>
>
>  ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Wolfgang Laun
> *Sent:* 11 April 2010 09:11
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Double Handling
>
>
>
> You are comparing a double to a String ("85"). Although MVEL might convert
> strings to numbers, I wouldn't use this without some cogent reason.
>
> Do you have this unexpected firing also when you use a double literal,
> i.e., 85.0 ?
>
> -W
>
> 2010/4/9 Ade Timi <adeyinka.timi at nathean.com>
>
> Hi,
>
>
>
> I am new to Drools. I am having a problem comparing 2 double values. I have
> a Java class with a double attribute called loanToValue. The loanToValue is
> been read from an XML file and the value is 92000.0. Based on this value I
> do not expect this rule to be fired, but for some reason it does. And the
> print statement returns 92000.0. Does anyone know what I’m doing wrong? My
> rule looks as follows:
>
>
>
> *rule* "G2 Equity in Asset"
>
>       *ruleflow-group* "goods"
>
>       *dialect* "mvel"
>
>       *when*
>
>             $d : IndividualDecision()
>
>             Individual(*eval*($d.getLoanToValue() < "85"))
>
>       *then*
>
>             System.out.println("loanToValue: " + ($d.getLoanToValue()));
>
> *end*
>
> * *
>
> Thanks,
>
> Ade
>
>
>
> *Adeyinka Timi* | Technical Supprt | *Nathean Technologies Ltd*
>
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