not getting downloadLink some times

@praveenkumark Isn't it worth writing rules as follows and reuse them as and when required?


emobUtilIsValidDocument

1. documentId_int (Number Integer)

fn!if(
\tfn!isnull(ri!documentId_int),
\tfalse,
\tfn!isObjectExists("Document",ri!documentId_int)
\t/* isObjectExists avaliable at http://bit.ly/2coVGoM and safely ignores invalid document objects */
)


eumobUiDocumentDownloadLink

1. documentId (Number Integer)

fn!if(
\trule!emobUtilIsValidDocument(documentId_int:ri!documentId_int),
\ta!documentDownloadLink(label:fn!document(ri!documentId_int,"name"),document:ri!documentId_int),
\tnull
)

And apply in your implementation as follows:

links: if(rule!APN_isEmpty(data.tAttachmentids),{},apply(rule!eumobUiDocumentDownloadLink,data.tAttachmentids))

As far as my knowledge is considered, you shouldn't remove the nulls and apply documentDownloadLink function. Let the nulls or invalid document ids be present in the actual data(provide to 'links attribute') similar to the nulls or invalid document ids present in the actual data in the 'data' attribute. Apply a!documentDownloadLink only on those elements that evaluate to proper document objects and don't apply it when the check evaluates to false. This way, you can make sure that the number of links is equal to the number of elements in data and can eliminate the mismatch between the both. Also, you can safely avoid invalid document objects(where document id is in the database but the actual document object is deleted), nulls and array handling which might cause errors at times.

@praveenkumark Isn't it worth writing rules as follows and reuse them as and when required?


emobUtilIsValidDocument

1. documentId_int (Number Integer)

fn!if(
\tfn!isnull(ri!documentId_int),
\tfalse,
\tfn!isObjectExists("Document",ri!documentId_int)
\t/* isObjectExists avaliable at http://bit.ly/2coVGoM and safely ignores invalid document objects */
)


eumobUiDocumentDownloadLink

1. documentId (Number Integer)

fn!if(
\trule!emobUtilIsValidDocument(documentId_int:ri!documentId_int),
\ta!documentDownloadLink(label:fn!document(ri!documentId_int,"name"),document:ri!documentId_int),
\tnull
)

And apply in your implementation as follows:

links: if(rule!APN_isEmpty(data.tAttachmentids),{},apply(rule!eumobUiDocumentDownloadLink,data.tAttachmentids))

As far as my knowledge is considered, you shouldn't remove the nulls and apply documentDownloadLink function. Let the nulls or invalid document ids be present in the actual data(provide to 'links attribute') similar to the nulls or invalid document ids present in the actual data in the 'data' attribute. Apply a!documentDownloadLink only on those elements that evaluate to proper document objects and don't apply it when the check evaluates to false. This way, you can make sure that the number of links is equal to the number of elements in data and can eliminate the mismatch between the both. Also, you can safely avoid invalid document objects(where document id is in the database but the actual document object is deleted), nulls and array handling which might cause errors at times.