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    • Creating and deleting rows when selecting values in a Select or Select-tree

    Question

    There is a field where I select values through a Select-tree. How can I make it so that after selection, new rows are created in another table, recording each selected value in a new row?

    Answer

    A field with the type Select-tree or Select with the Multiple parameter enabled stores a list.

    1. First, you need to determine which elements are selected as a result of changing the field. This can be done by the difference of lists, using the listMinus function.

      To determine what:

      • Added — you need to subtract the previous list of field values from the current one

      • Removed — you need to subtract the current list of field values from the previous one

    2. Based on this data, add or remove rows from the necessary table:

    In the field action code with Select-tree or Select with triggers for addition, modification, and deletion:

    a1=: insertList(table: 'some_table'; field: 'some_field' = $listAdd; log: true)

    listAdd: listMinus(list: $#nfv; list: $#onfv)

a2=: deleteList(table: 'some_table'; where: 'some_field' = $listDel; log: true)

    listDel: listMinus(list: $#onfv; list: $#nfv)