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How to constrain values displaying in pick-list?

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  • How to constrain values displaying in pick-list?


    Please assist this newbie with this pick list "constraint" problem.


    Suppose I have the following tables to support a web application that allows members of an organization to sign up for activities. The table relationships are:


    (the arrows point to the "many" in one-to-many relationships.)

    So, suppose we have:
    1. 2 records in table GROUP: group_a and group_b.
    2. 2 records in table ACTIVITY: hiking, swimming, and biking.
    3. For group_a, there are two child record in GROUP-ACTIVITY, one for hiking, the other for swimming. group_b has has one record, for biking, in GROUP-ACTIVITY.
    4. For simplicity, we have just 2 people in table MEMBER: member_a and group_leader_a
    5. Both members belongs to group_a.
    6. member_a has presently a record in the SIGNUP table for hiking.
    7. The group_leader_a has rights to view the MEMBER records for group_a members and to sign them up/delete them from activities.

    I'm envisioning that when group_leader_a goes to enroll member_a in additional activities, he selects member_a from a grid displaying all group_a members. At this point, a list of activities appears that member_a has signed up for, along with buttons for adding and deleting activities.

    Note: The SIGNUP table should have at least these fields:
    • signup_id
    • activity_id
    • member_id


    My immediate questions, in increasing difficulty, have to do with the how to create the list of selectable activities when group_leader_a clicks the Add button. Specifically:
    1. How do I make the activity name (stored in the activity_name field in the ACTIVITY field) appear in the list when the SIGNUP table has just the activity_id value? (I'm sure this is an easy field lookup.)
    2. How do I make the list of available activities for member_a NOT include those activities that he is already signed up for?
    3. How do I make the list of activities additionally constrained to include only those activities member_a has the rights to sign up for by virtue of the his inclusion in group_a?

    So, in our example, the displayed list of activities member_a can still sign up for would only show swiming: He's already signed up for hiking, and biking doesn't appear in the list because group_a members don't have the rights to sign up for it. (Group_b's members can sign up for biking, and only biking.)