Grails Goodness: Refactoring Criteria Contents

Grails adds a Hibernate criteria builder DSL so we can create criteria's using a builder syntax. When we have criteria with a lot of restrictions or conditional code inside the builder we can refactor this easily. We look at a simple criteria to show this principle, but it can be applied to more complex criteria's.

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

// Original criteria builder. def list = Domain.withCriteria {     ilike 'title', 'Groovy%'     le 'postedDate', new Date() }   // Refactor def list2 = Domain.withCriteria {     title delegate, 'Groovy%'     alreadyPosted delegate }   private void title(builder, String query) {     builder.ilike 'title', query }   private void alreadyPosted(builder) {     builder.le 'postedDate', new Date() }