Compare Data Changes in CDT

RE: Compare Data Changes in CDT

viveku3486 — Tue, 26 Dec 2017 13:00:24 GMT

I think you can try difference() function, May be it will help you

RE: Compare Data Changes in CDT

aswinb608 — Fri, 22 Dec 2017 12:56:03 GMT

Consider creating audit history tables in db using triggers....doing it the appian way is complicated with lot of expression rule logic which can cause performance issues

RE: Compare Data Changes in CDT

anjup — Thu, 21 Dec 2017 05:11:31 GMT

Hi... I have similar requirement to fetch the CDT field names, I am getting the error below
"An error occurred while trying to parse the XML stream" while using "xpathsnippet". Please help me on this.

RE: Compare Data Changes in CDT

Stefan Helzle — Fri, 07 Oct 2016 13:50:11 GMT

You are welcome :-)

RE: Compare Data Changes in CDT

Shashank — Fri, 07 Oct 2016 13:34:11 GMT

@stefanh , thanks a lot it was very helpful, the "xpathsnippet" would be of great use to me , never thought of xpathsnippet for getting the field names

RE: Compare Data Changes in CDT

Stefan Helzle — Fri, 07 Oct 2016 12:57:15 GMT

Did some small tests. It might not work for all cases, but can be a start:

CdtDiff(cdt1, cdt2):
=with(
local!fieldNames: apply(xpathsnippet(_, "name(*)"), xpathsnippet(toxml(ri!cdt1), "/*/*")),
apply(rule!CdtDiffField(ri!cdt1, ri!cdt2, _), local!fieldNames)
)

CdtDiffField(cdt1, cdt2, fieldName):
=with(
local!fieldOneType: runtimetypeof(index(ri!cdt1, ri!fieldName, null)),
local!fieldTwoType: runtimetypeof(index(ri!cdt2, ri!fieldName, null)),
local!fieldOneExits: tostring(index(ri!cdt1, ri!fieldName, "x_#")) <> "x_#",
local!fieldTwoExits: tostring(index(ri!cdt2, ri!fieldName, "x_#")) <> "x_#",
if(and(local!fieldOneExits, local!fieldTwoExits, local!fieldOneType = local!fieldTwoType),
if(local!fieldOneType < 1000,
{field: ri!fieldname, same: ri!cdt1[ri!fieldName] = ri!cdt2[ri!fieldName]},
{field: ri!fieldname, children: apply(rule!CdtDiff(_,_), merge(ri!cdt1[ri!fieldName], ri!cdt2[ri!fieldName]))}
),
false
)
)

RE: Compare Data Changes in CDT

Stefan Helzle — Fri, 07 Oct 2016 11:52:22 GMT

Using some ideas from forum.appian.com/.../e-238884 you should be able to implement a recursive expression to handle nested CDTs. First expression gets all field names. Then you create an expression that is applied to all fields in the CDT. It checks if the datatype is a multiple and/or a CDT. If yes, it calls the first expression on the sub structure.

RE: Compare Data Changes in CDT

Shashank — Fri, 07 Oct 2016 10:36:31 GMT

@Bolluru Mahesh Sachin Anand , thanks for the shared component , it was helpful , but i am still trying to figure out a way to handle nested CDTs

RE: Compare Data Changes in CDT

Shashank — Fri, 07 Oct 2016 10:35:21 GMT

@sikhivahans , it is temporary only , i am not considering persisting the data for now as @chetany mentioned , the plugin is not able to handle nested cdts , I am still trying to figure out a way for that , any suggestion on that part also would be helpful , according to my requirement , the rule should be a generic one , which can handle any type of CDT and get the differences in data ( latest and the very previous one only)

RE: Compare Data Changes in CDT

sikhivahans — Fri, 07 Oct 2016 10:20:59 GMT

@shashankb Is it temporary or are you trying to persist it to the database? If it's later, did you consider delegating it to the database?

RE: Compare Data Changes in CDT

chetany — Fri, 07 Oct 2016 10:06:46 GMT

It also will not work if the CDT is nested

RE: Compare Data Changes in CDT

jagadeesh — Fri, 07 Oct 2016 10:01:48 GMT

Yes above one helped you to get changed attributes data from your CDTs. but your CDTs should contains primitive data types and shouldn't contain array variables

RE: Compare Data Changes in CDT

Sachin — Fri, 07 Oct 2016 09:58:06 GMT

@Shashank please find the below shared component forum.appian.com/.../summary
hope this is helpful