SNOW-CAD Practice Question: Automating application logic with business rules and scripts
A developer needs to create a business rule that runs only when the 'State' field of an Incident changes from 'New' to 'In Progress'. Which condition script should be used?
⚠ Common exam trap
The trap here is that candidates often pick Option D thinking `changesTo('In Progress')` alone is sufficient, forgetting that it does not restrict the previous state, so the rule would fire for any transition into 'In Progress', not just from 'New'.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
current.state.changes() && current.state.changesFrom('New')
It uses both `current.state.changes()` to verify the field has changed and `current.state.changesFrom('New')` to ensure the previous value was 'New'. This combination precisely captures the transition from 'New' to any other state, which when combined with the business rule's 'when to run' condition (set to 'In Progress' in the rule's filter or script), ensures the rule fires only when the state changes from 'New' to 'In Progress'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
current.state.changes() && current.state.changesFrom('New')
Why this is correct
This correctly checks that the state changed and the previous value was 'New'.
- ✗
current.state == 'New' && current.state.changesTo('In Progress')
Why it's wrong here
current.state == 'New' checks the current value, which after update is 'In Progress', so condition fails.
- ✗
current.state.changes() && previous.state == 'New'
Why it's wrong here
previous() is deprecated; use changesFrom() instead.
- ✗
current.state.changesTo('In Progress')
Why it's wrong here
This does not check that the previous state was 'New'; it could change from any state.
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