If I understand the problem correctly I would restate it as:
There are dashboard items (DashboardItem) that can be displayed on a dashboard. There is a relationship between user groups (Group) and a subset of dashboard items defining which dashboard items can be displayed for that group. You want to add a relationship between the user (User) and the subset of dashboard items that are available to the group and allow them to choose which of those items will be displayed on their personal dashboard.
If that problem statement is correct then you would want to do something with a HABTM relationship between DashboardItem and Group as well as a HABTM relationship between DashboardItem and User with the limitation that only items that satisfy the constraint of being in the list of DashboardItems associated with a particular group are available to be included in the DashboardItems that can be associated with a User.
You will probably need custom code in the afterDelete and afterSave callbacks of the group_dashboard_items model that will update the user_dashboard_items model to remove or insert additional relationships.
This does not address the actual content of your DashboardItems which would presumably be generated on the fly from other models (as others have already pointed out in their responses).
There are dashboard items (DashboardItem) that can be displayed on a dashboard. There is a relationship between user groups (Group) and a subset of dashboard items defining which dashboard items can be displayed for that group. You want to add a relationship between the user (User) and the subset of dashboard items that are available to the group and allow them to choose which of those items will be displayed on their personal dashboard.
If that problem statement is correct then you would want to do something with a HABTM relationship between DashboardItem and Group as well as a HABTM relationship between DashboardItem and User with the limitation that only items that satisfy the constraint of being in the list of DashboardItems associated with a particular group are available to be included in the DashboardItems that can be associated with a User.
You will probably need custom code in the afterDelete and afterSave callbacks of the group_dashboard_items model that will update the user_dashboard_items model to remove or insert additional relationships.
This does not address the actual content of your DashboardItems which would presumably be generated on the fly from other models (as others have already pointed out in their responses).
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