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DATAMONGO-1865 - Avoid IncorrectResultSizeDataAccessException for derived findFirst/findTop queries.

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We now return the first result when executing findFirst/findTop queries. This fixes a glitch introduced in the Kay release throwing IncorrectResultSizeDataAccessException for single entity executions returning more than one result, which is explicitly not the desired behavior in this case.

Original pull request: #530.
This commit is contained in:
Christoph Strobl
2018-02-07 13:50:18 +01:00
committed by Mark Paluch
parent 5a783ba21f
commit 0ec840e34a
15 changed files with 202 additions and 58 deletions
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11
src/main/asciidoc/reference/mongo-repositories.adoc
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@@ -140,17 +140,18 @@ public interface PersonRepository extends PagingAndSortingRepository<Person, Str
Person findByShippingAddresses(Address address); <3>
Stream<Person> findAllBy(); <4>
Person findFirstByLastname(String lastname) <4>
Stream<Person> findAllBy(); <5>
}
----
<1> The method shows a query for all people with the given lastname. The query will be derived parsing the method name for constraints which can be concatenated with `And` and `Or`. Thus the method name will result in a query expression of `{"lastname" : lastname}`.
<2> Applies pagination to a query. Just equip your method signature with a `Pageable` parameter and let the method return a `Page` instance and we will automatically page the query accordingly.
<3> Shows that you can query based on properties which are not a primitive type.
<4> Uses a Java 8 `Stream` which reads and converts individual elements while iterating the stream.
<3> Shows that you can query based on properties which are not a primitive type. Errors with `IncorrectResultSizeDataAccessException` if more than one match found.
<4> Uses the `First` keyword to restrict the query to the very first result. Unlike <3> this method does not error if more than one match found.
<5> Uses a Java 8 `Stream` which reads and converts individual elements while iterating the stream.
====
NOTE: Note that for version 1.0 we currently don't support referring to parameters that are mapped as `DBRef` in the domain class.
[cols="1,2,3", options="header"]

15
src/main/asciidoc/reference/reactive-mongo-repositories.adoc
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@@ -52,15 +52,22 @@ We have a quite simple domain object here. Note that it has a property named `id
----
public interface ReactivePersonRepository extends ReactiveSortingRepository<Person, Long> {
Flux<Person> findByFirstname(String firstname);
Flux<Person> findByFirstname(String firstname); <1>
Flux<Person> findByFirstname(Publisher<String> firstname);
Flux<Person> findByFirstname(Publisher<String> firstname); <2>
Flux<Person> findByFirstnameOrderByLastname(String firstname, Pageable pageable);
Flux<Person> findByFirstnameOrderByLastname(String firstname, Pageable pageable); <3>
Mono<Person> findByFirstnameAndLastname(String firstname, String lastname);
Mono<Person> findByFirstnameAndLastname(String firstname, String lastname); <4>
Mono<Person> findFirstByLastname(String lastname); <5>
}
----
<1> The method shows a query for all people with the given lastname. The query will be derived parsing the method name for constraints which can be concatenated with `And` and `Or`. Thus the method name will result in a query expression of `{"lastname" : lastname}`.
<2> The method shows a query for all people with the given firstname once the firstname becomes available via the given `Publisher`.
<3> Use `Pageable` to pass on offset and sorting parameters to the database.
<4> Find a single entity for given criteria. Errors on non unique results.
<5> Unless <4> the first entity is returned no matter what.
====
For JavaConfig use the `@EnableReactiveMongoRepositories` annotation. The annotation carries the very same attributes like the namespace element. If no base package is configured the infrastructure will scan the package of the annotated configuration class.