Notion Databases: Filters and Forcing Functions

Forcing functions in Notion databases let users set automatic defaults for new rows—so key properties don’t start out blank. The core idea is simple: a forcing function is a filter on a database view that “forces” newly created entries to adopt specific values in chosen properties. In practice, that means a task added from a “Today” view can automatically receive today’s due date instead of leaving the due field empty, while other properties remain blank until the user fills them in.

That same mechanism becomes especially useful in Kanban-style workflows. Board views create columns based on a property (typically a Select or sometimes Multi-select or Person). When a new card is created inside a column, Notion effectively applies a forcing function automatically—setting the status (or equivalent property) to the column’s value. The transcript also shows a manual version of the same concept: using a filter condition like “Status is Not Empty.” Rather than forcing a specific status (e.g., To Do), “Is Not Empty” forces Notion to pick a default from the property’s option list—specifically the first value in the list. By reordering options, users control which default gets applied, ensuring new rows always land in a sensible starting state.

The technique scales well in real templates. In the Ultimate Tasks template’s “Today” view, the “Is Not Empty” trick is applied to multiple properties—such as Kanban-State and Priority—so new tasks created from the inbox automatically receive To Do and Medium. A key nuance is that this approach can preserve view visibility: if a user changes Priority from Medium to High, the task can still appear in the intended filtered group because the forcing function didn’t hard-code a single value; it only guaranteed the field wasn’t empty.

Notion’s forcing functions do have limits. Most property types can be used, but several are effectively read-only in this context—especially Formula, Roll-ups, Created Time, Created By, Last Edited Time, and Last Edited By. Attempting to force values into these properties can result in a blank new page and even missing row creation, because Notion won’t write to those fields. Files and Media are also constrained: forcing an empty file may work, but forcing a non-empty file value doesn’t.

A major unlock comes from using relations as forcing functions. By linking a tasks database to a classes database, a view can automatically assign the correct class relation when creating tasks from within a class page. The transcript goes further by using a Self Referential Filter inside a class template, so each new class instance updates the linked database filter automatically. That means users don’t have to edit the relation filter every time they create a new class; the template adapts based on the page name.

Finally, forcing functions aren’t consistently respected when data enters from outside Notion. Web Clipper imports and CSV merges don’t apply forcing functions to incoming rows (and the API wasn’t tested). For manual creation and template-driven workflows, though, forcing functions are positioned as a practical way to reduce friction, enforce structure, and keep databases usable from the moment new rows are created.