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REPOST - "Updating values in auto-enter calc fields without using..."

Question asked by tc_fmdev on Sep 16, 2014
Latest reply on Sep 16, 2014 by tc_fmdev


REPOST - "Updating values in auto-enter calc fields without using..."


Hi PhilModJunk,
I have done this sequence EXACTLY multiple times....
It works UNTIL step 4.
THEN ON STEPS 5 & 6...Filemaker 13 Pro goes and deletes it all again...
I have tried checking unchecking Do Not replace existing value of field along with every combination of VALIDATION settings (ALWAYs and Allow user to override) when reverting the field back to NUMBER and it just deletes the field contents.
I have also made an entire new field and placed it on the layout.
Any idea on what I can try next?
Thank you for your time in advance
I have restarted this post as per PhilModJunk 

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Updating values in auto-enter calc fields without using...
Forum post posted September 16, 2011 by PhilModJunk, last edited February 10, 2012 
1811 Views, 4 Comments
Updating values in auto-enter calc fields without using Replace Field Contents

Every now and then new users trip over the following scenario:

They add or modify an auto-enter calculation for a field in a table that already contains records and are suprised to discover that the existing records do not automatically use the new expression to calculate updated values in these existing records. Only new records or records where a referenced field is edited apply the new expression to calculate the updated value.

I've often helped people fix this problem by having them use Replace Field Contents with the calculation option and using the new calculation expression to update the existing records.

The following method updates such a field's auto-entered value and is a bit simpler:

For the sake of this example, I'll use a number field with this simple auto-enter calculation:

Numb1 + Numb2

  1. We have several 100 records entered before We realize that this expression should really be ( Numb1 + Numb2 ) / 2
  3. Open Manage | Database | Fields and use the Type drop down to change this field from Number to Calculation and click Change. A warning dialog pops up, click OK to permit the change.
  5. With the field still selected, click the options button to open the specify calculation dialog. The original auto-entered calc expression: Numb1 + Numb2 has been conveniently brought up in the dialog. Edit it to compute the average of these two fields as shown above. Make sure Number is selected as the return type.
  7. Click OK twice to close the Specify Calculation dialog and Manage database. Because We've converted the field to type calculation, the value in this field updates automatically for every record in the table.
  9. Now re-open manage | database | fields and change the field back to type Number. Double click the field to bring up field options, click the calculation check box. We find that ( Numb1 + Numb2 ) / 2 is already entered for us as the auto-enter calculation.
  11. Now all we have to do is close the dialog, clear the "do not replace ..." check box and click OK until we've closed Manage | Database | Fields.