$graphLookup
Reference group: Pipeline stages
What it does
Recursively traverses relationships.
Syntax
{$graphLookup: { from, startWith, connectFromField, connectToField, as, maxDepth? }}
Use case
Retrieve ancestors/descendants.
Important notes
Use depth limits and index relationship fields.
$graphLookup: practical example
{ $graphLookup: { from: "categories", startWith: "$parentId", connectFromField: "parentId", connectToField: "_id", as: "ancestors", maxDepth: 5 } }💡 Explanation
Recursively traverses relationships.
When to use it
Retrieve ancestors/descendants.
Caution
Use depth limits and index relationship fields.
Key Takeaways
- Recursively traverses relationships.
- Typical use: Retrieve ancestors/descendants.