spring.flyway.ignore-migration-patterns cannot be set to an empty string

[manderson23]

The Flyway documentation for ignoreMigrationPatterns at https://documentation.red-gate.com/fd/flyway-ignore-migration-patterns-setting-277579002.html states

By default, future migrations are ignored. You can unset this by assigning an empty string to ignoreMigrationPatterns

Reviewing https://github.com/spring-projects/spring-boot/blob/3.5.x/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration.java it only sets the value of spring.flyway.ignore-migration-patterns when the list is not empty.

When using Flyway with Spring Boot it looks like it isn't possible to set to an empty string as documented by Flyway.

[Chanwon-Seo]

Hi, @manderson23.

As the issue description points out, the problem seems to be in FlywayAutoConfiguration.java where the ignore-migration-patterns are configured.

spring-boot/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration.java

Line 324 in 234501a

.whenNot(List::isEmpty)

The line .whenNot(List:isEmpty) prevents properties from being set when an empty list is provided.

By removing this line, you can set the property to an empty value, which can fix the problem as described in the Flyway document.

If this approach sounds good, I'd like to submit PR including modifications. Please let me know your opinion.

Thank you!