A Segment is a subset of a Collection: it's a saved filter of your Collection.
Segments are designed for those who want to systematically visualize data according to specific sets of filters. It allows you to save filter configurations so user don’t have to do repetitive actions every day.

From your admin panel

Segments can be configured from the interface, without the need to write any code.
This is documented in the User Guide ↗.

From your Agent

Sometimes, Segment filters are complicated and closely tied to your business. Forest Admin allows you to code how the Segment is computed.
For instance, in our Live Demo example ↗, we’ve implemented a Segment on the collection products to allow admin users to see the bestsellers at a glance.


The only requirement when implementing a Segment from your agent is to return a valid ConditionTree.
from forestadmin.datasource_toolkit.context.collection_context import CollectionCustomizationContext
from forestadmin.datasource_toolkit.interfaces.query.aggregation import Aggregation, PlainAggregation, PlainAggregationGroup
from forestadmin.datasource_toolkit.interfaces.query.condition_tree.nodes.leaf import ConditionTreeLeaf
async def most_purchased_segment(context: CollectionCustomizationContext):
# Query the ids of the 10 most populate products by looking at the `orders` collection.
rows = await context.datasource.get_collection("order").aggregate(
PlainAggregation(operation="Count", groups=[PlainAggregationGroup(field="product_id")])
# Return a condition tree which matches those records
return ConditionTreeLeaf(
field="id", operator=Operator.IN, value=[row["group"]["product_id"] for row in rows]
agent.customize_collection("products").add_segment("mostPurchased", most_purchased_segment)