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Change Detection (diff/delta)
Change Detection (diff/delta)

Using change detection to find out when values change

Morten Franck avatar
Written by Morten Franck
Updated over a week ago

Change detection is a feature of that can be used to find out when specific values of robot execution results change. Change detection can also be seen as diff'ing or delta functionality.

Output values from the robot that you choose are compared from the current execution with the previous execution - in effect, providing a "sliding window" of changes. Read on for details on how to configure and use.

Enabling change detection

Currently, contact us if you would like this feature enabled on your account. Search for "change detection" in Apps and click the "Contact Dexi" button:

Configuring change detection

Once the app is enabled, the feature is enabled for a configuration of a robot by checking the "Track changes?" checkbox:

The Key fields define the fields that are used to determine the uniqueness of a row, ie. when the values of the key fields match across the previous and the current execution, the values from the Value fields are then compared:

  • If values are new, the row is marked as Created.

  • If values are unchanged, the row is marked as Existed.

  • If values have changed, the row is marked as Changed.

  • If values were deleted, the row is marked as Deleted.

A field cannot be selected as both a key and value field and currently, only non-file, non-object and non-array/list fields, ie. "simple" fields are supported for both key and value fields.

Results with change detection

The change status is added to the results as a separate field, Change (called "@change" when results are exported or when using change detection from triggers - more on this later).

Example showing only Changed rows:

If any rows were deleted, they are shown on the "Deleted results" tab.

The "Old value prefix" controls the name of the "old" fields, ie. the fields of the rows of the previous execution. In the example below the prefix "previous-" has been entered:

If left blank, the prefix "old-" is used.

Tip! This part of Dexi doesn't have auto-save so when changing any part of the change detection configuration (or any other part of the robot configuration for that matter), remember to click "Save".

Change detection with triggers

The "old value" fields and the "@change" field are available from triggers and can be mapped just like the "normal" fields from the result rows:

See also:

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