This document discusses tips for creating custom transformers in FME, including considerations for repetition, group-by processing, and looping. It provides examples of using custom transformers for list looping and group-by processing. It also covers best practices for parameters, filters, and sharing custom transformers for reusability both locally and on FME Server.

1. Upcycle your workspaces
tips ‘n tricks for Custom Transformers

2. FME
User
Conference
20
22
Lars de Vries
GIS and FME Consultant
• Owner Omkeere B.V.
• FME Certified Profesional
• FME Certified Trainer

3. 20
22
FME
User
Conference
RECYCLE
LIKE THERE’S NO TOMORROW

4. 20
22
FME
User
Conference
Preparing the ascent
● Choosing the right path
● Considerations
● Configuration
● Contemplation

5. 20
22
FME
User
Conference
Custom Transformers?

6. 20
22
FME
User
Conference
Usefulness and necessity? My
contributions

7. 20
22
FME
User
Conference
The right path
• Custom Transformer
• User Parameter
• (Collapsed) bookmark
• Template workspace

8. 20
22
FME
User
Conference
1. Repetition
2. Serial Group-by processing
3. Looping
Three considerations

9. 20
22
FME
User
Conference
Repetition

10. 20
22
FME
User
Conference
Repetition

11. 20
22
FME
User
Conference
Group-by per transformer
Group-by with a
custom transformer

12. 20
22
FME
User
Conference
Group-by
Only per transformer
Earlier
All in one
Now

13. 20
22
FME
User
Conference
Looping
● Control over
- Input ports
- Output ports
● Loop to input
● Works great with lists

14. 20
22
FME
User
Conference
List looping
_values{0}.old [projectname]
_values{0}.new FME User Conference
_values{1}.old [errornumber]
_values{1}.new 3
_values{2}.old [topic]
_values{2}.new custom transformers
text: Our research for the project [projectname] shows that the
dataset has [errornumber] errors.
Despite these [errornumber] errors, we would like to continue our
demo about [topic].
_updated_text: Our research for the project FME User Conference shows that
the dataset has 3 errors.
Despite these 3 errors, we would like to continue our demo
about custom transformers.

15. 20
22
FME
User
Conference
Creation of a Custom Transformer
Build from scratch
Convert an existing workflow

16. 20
22
FME
User
Conference
Re-usability
● Usable as any other transformer
● Within current workspace
● In other workspaces

17. 20
22
FME
User
Conference
Link or Embed?
• FME Server
• Maintainability

18. 20
22
FME
User
Conference
Sharing
Local
Organization

19. 20
22
FME
User
Conference
1. Temporary attributes
2. Avoid AttributeKeeper
3. (Naming) conventions
Parameters and Filters
To take into account

20. 20
22
FME
User
Conference
Adapt.

21. 20
22
FME
User
Conference
My favourites?

22. 20
22
FME
User
Conference
Custom Transformers
A power-up for your workspaces

23. 20
22
FME
User
Conference
Useful resources
hub.safe.com

24. Thank You!
larsdevries@omkeere.com

25. 20
22
FME
User
Conference
Please Share Your Session Feedback
Log in & navigate to the
agenda. Select the
session you attended
Scroll down to “Session
Feedback”
Download EventMobi app
Event code: fmeuc
Click “Launch App”
Fill out the survey
and submit