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Helper II
Helper II

Online/Offline sharepoint backup system creating duplicates.

So I've made an app for a field crew to record quality control conditions, it saves data locally when offline, and uploads when online. it also stores each record locally as a backup if an upload to sharepoint fails or if the record is deleted from the back end.

It works fine if there are no edits made to the record. but if the record is changed, even if the strings its checking are identical, it will push a new duplicate record. See example code below, it runs on a trigger to check the backup data against the sharepoint list.

                    Text(ElemQCNum) in ElementData.ElemQCNum,
                    Text(DrillCount) in ElementData.DrillCount,
                    Text(Title) in ElementData.ProjectFullName

does anyone else have a cleaner "upload if record doesn't exist online"? "ElementData" is the online list, "ElementDataBackup" is the local collection. all column names are double checked and correct.

Super User
Super User


This video by Paul O'Flaherty is a really good explanation of working in offline mode. He uses the 3 things to identify records to be:

- added as new

- modified, and

- deleted


For adding new, he leverages the fact there is currently no ID value for a record.

For modifying, he adjusts the Modified Date to 1/1/3001.

For deleting, he adjusts the Modified Date to 1/1/3000.


Then using the above he Filters the local collection and updates his SP List accordingly. The video is 1hr 40min but well worth watching

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