I'm working on an expression rule that takes two inputs: an integer value (f

robbier over 9 years ago

I'm working on an expression rule that takes two inputs: an integer value (fieldname is key), and a CDT array (AnyType) where one of the fields I want to search on is named Key..so MyCDT.Key. The expression rule is actually more complex then this but to isolate my issue I am giving only the specifics here. Anyhow, here is the rule:

= load(
wherecontains(
ri!key,
ri!MyCDT.Key
)
)

I'm getting the following error:
"There was an error testing the rule:
Expression evaluation error at function 'wherecontains' parameter 2 [line 2]:"

I'm pretty certain this has to do with the fact that something is lost in passing something over to the expression rule--that it has no clue what this AnyType is. Perhaps I need to do an explicit cast of my AnyType into a CDT array?

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0 robbier over 9 years ago

The big issue I was having was that I was passing in my CDT array from a rule that I had set up for testing. I was creating the array MyCDT using a data dictionary method (e.g. {{Key:1, Value: "A"},{Key: 2. Value: "B"}, etc etc}. This was some sort of casting issue I was having. When I started testing this rule through a SAIL form (and using a the true CDT array type as ultimately passed in from my process) this problem went away. The other thing I was having a problem with was when my array was either null or zero length. Those two edge conditions were problematic for me, so I needed to test the CDT array against them by using:

if(rule!lengthNullSafe(ri!MyCDT) > 0,
wherecontains(ri!Key,ri!MyCDT.Key),
0
)

The rule, rule!lengthNullSafe, is a simple null safe version of the length function where the array length gets returned as 0 if the array is null. Here is the rule that we created:

if (isnull(ri!input), 0, length(ri!input))

Pretty simple but by making those adjustments I was able to now test for both 0 and null in the array.
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0 robbier over 9 years ago

The big issue I was having was that I was passing in my CDT array from a rule that I had set up for testing. I was creating the array MyCDT using a data dictionary method (e.g. {{Key:1, Value: "A"},{Key: 2. Value: "B"}, etc etc}. This was some sort of casting issue I was having. When I started testing this rule through a SAIL form (and using a the true CDT array type as ultimately passed in from my process) this problem went away. The other thing I was having a problem with was when my array was either null or zero length. Those two edge conditions were problematic for me, so I needed to test the CDT array against them by using:

if(rule!lengthNullSafe(ri!MyCDT) > 0,
wherecontains(ri!Key,ri!MyCDT.Key),
0
)

The rule, rule!lengthNullSafe, is a simple null safe version of the length function where the array length gets returned as 0 if the array is null. Here is the rule that we created:

if (isnull(ri!input), 0, length(ri!input))

Pretty simple but by making those adjustments I was able to now test for both 0 and null in the array.
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