Prefiltering
Prefiltering is the screening or filtering of inputs before they undergo subsequent processing or analysis.
Spring Security in Action, Second Edition
Prefiltering is filtering applied to a method's input parameters before the method receives them.
- How it is used
- Uses input filtering to enforce authorization inside reusable method use cases while leaving business logic focused on its operation.
- How deep it goes
- Explains aspect interception, @PreFilter SpEL expressions, collection constraints, and mutable-input behavior through runnable examples.
- Examples
- Demonstrates owner-filtered products through a /sell endpoint, curl requests, response lists, and an immutable-list failure.
- What you can do after
- Apply it via Spring Security to restrict collection or array inputs before authorized service methods process them.
Read how Spring Security in Action, Second Edition explains prefiltering →
MongoDB 8.0 in Action, Third Edition
A prefilter is a predicate applied before vector similarity search to restrict the candidate documents.
- How it is used
- Narrows the search space before vector similarity search to improve query performance.
- How deep it goes
- Explains index preparation, supported predicates, pipeline restrictions, and MongoDB driver implementations.
- Examples
- Uses movie genre and runtime filters, plus electronics and price filters in MongoDB, Python, and Ruby examples.
- What you can do after
- Apply it via $vectorSearch and MongoDB drivers after indexing filter fields and composing supported predicates.
Read how MongoDB 8.0 in Action, Third Edition explains prefiltering →
Related concepts
- $vectorSearchuses · $vectorSearch is a MongoDB aggregation pipeline stage that performs vector similarity search with optional filtering.
- filteringkind of · Filtering is the operation of selecting or excluding items from a collection according to specified criteria.
- vector indexconfigured by · A vector index is a data structure that organizes vector representations to support efficient similarity or nearest-neighbor search.
- @PreFilterimplemented by · @PreFilter is a Spring Security annotation that filters elements of a method's input collection or array according to an authorization expression before execution.
- immutable collectioncontrasts with · An immutable collection is a collection whose membership and contents cannot be changed after creation.
- aspectimplemented by · An aspect is a modular unit of cross-cutting behavior applied around selected program operations or method invocations.
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