Transforming a search query into an EF expression with Lucene
Blog post from Basis Theory
An ASP.NET Core 6 tutorial demonstrates how to build a REST search endpoint that accepts Lucene query syntax, translates it into Entity Framework predicates, and filters an in-memory Persons table. Using a WhitespaceAnalyzer and QueryParser, the endpoint parses requests such as `firstName:Bob OR favoriteFood:Steak`, returning all records when no query is supplied. The implementation converts Lucene query objects recursively into `Expression<Func<Person, bool>>` filters, supporting individual field-value TermQuery predicates, BooleanQuery combinations through AND and OR clauses, and PhraseQuery handling for multi-word values such as favorite foods. Supported searchable fields include first name, last name, social security number, and favorite food, while unsupported query types such as ranges and negation are intentionally excluded. The example also notes that Lucene operators are case-sensitive and cautions that sensitive data should be encrypted in real production systems.
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