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retaining calculated fields on record update

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  • retaining calculated fields on record update

    I have a field in "table a" named "disc"
    It holds a calculated value based on
    "LOOKUPN("F", CLIENT_ID, "discount_rate","clients","client_id")
    No problems there but the "discount_rate" in the "clients" table can be changed from time to time.
    There are multipe records in "table a" holding the "disc" value.
    Can the original "disc" field value in each record be maintained when a record is updated?

    Any help most welcome.

  • #2
    Re: retaining calculated fields on record update

    Originally posted by johnG View Post
    I have a field in "table a" named "disc"
    It holds a calculated value based on
    "LOOKUPN("F", CLIENT_ID, "discount_rate","clients","client_id")
    No problems there but the "discount_rate" in the "clients" table can be changed from time to time.
    There are multipe records in "table a" holding the "disc" value.
    Can the original "disc" field value in each record be maintained when a record is updated?

    Any help most welcome.
    change from the calculated value to a default value and put a skip rule
    on the field. Or, you could put the expression result on the form (if the rule
    does NOT apply to all forms for the table)

    Comment


    • #3
      Re: retaining calculated fields on record update

      JohnG, no. If you continue to use the calc field rule it will re-evaluate the field value each time a record is saved. A user entered update to an existing record (after a change in the discount rate in the lookup table) would cause the previous calc field value to change. I think this may be inferred from John L's reply, but wanted to go ahead and spell it out for you.

      Comment


      • #4
        Re: retaining calculated fields on record update

        Tom / JohnL thanks for the replies... as the entry wasn't entered via a form but a script I have changed the field rule to 'user entered' and then added code to the script which seems to work just fine. Just got to change some more codes in simialr scripts and all should be well
        Many thanks

        Comment


        • #5
          Re: retaining calculated fields on record update

          Since, based on the number of posts, it appears that you're relatively new to A5, you might want to check out this thread about setting "last changed" dates. (Hint - they should NOT be calculated fields!)

          FWIW: Almost every table I build has a Create_dtf and Change_dtf. Even if it isn't "needed", I often find out that it really is needed! There have been a number of times in the past when someone has come up with a request that would be easy to do if I just knew when the records were created/changed but, since those dates weren't "needed" they weren't available. I've also had people tell me that there was no way the record was changed since X months ago - then I show them the Change_dtf that says it was changed yesterday and all of a sudden the story changes. These dates are often not shown on any forms; they are just 'there' in the table in case I need them.

          It may seem stupid to some but almost every table I build now, even a simple lookup table with one "real" field, will include those two date fields. Having them there has either enabled me to do something that wouldn't have been possible otherwise or saved me from major problems a number of times.

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