Add conversion capabilities to the entity instantiator.

Closes #1646

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/AbstractJdbcAggregateTemplateIntegrationTests.java

@@ -1268,6 +1268,16 @@ void multipleCollectionsWithEmptyList() {
 		assertThat(reloaded.mapElements.get("delta")).isEqualTo(new MapElement("four"));
 	}
 
+	@Test // GH-1646
+	void recordOfSet() {
+
+		Author tolkien = template.save(new Author(null, Set.of(new Book("Lord of the Rings"))));
+
+		Iterable<Author> authors = template.findAll(Author.class);
+
+		assertThat(authors).containsExactly(tolkien);
+	}
+
 	private <T extends Number> void saveAndUpdateAggregateWithVersion(VersionedAggregate aggregate,
 			Function<Number, T> toConcreteNumber) {
 		saveAndUpdateAggregateWithVersion(aggregate, toConcreteNumber, 0);
@@ -2079,6 +2089,13 @@ record SetElement(String name) {
 	record MapElement(String name) {
 	}
 
+	record Author(@Id Long id, Set<Book> books) {
+	}
+
+	record Book(String name) {
+
+	}
+
 	@Configuration
 	@Import(TestConfiguration.class)
 	static class Config {

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-db2.sql

@@ -47,6 +47,9 @@ DROP TABLE MAP_ELEMENT;
 DROP TABLE LIST_ELEMENT;
 DROP TABLE SET_ELEMENT;
 
+DROP TABLE BOOK;
+DROP TABLE AUTHOR;
+
 CREATE TABLE LEGO_SET
 (
   "id1"  BIGINT GENERATED BY DEFAULT AS IDENTITY (START WITH 1) PRIMARY KEY,
@@ -405,3 +408,14 @@ CREATE TABLE MAP_ELEMENT
     MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
     NAME VARCHAR(100)
 );
+
+CREATE TABLE AUTHOR
+(
+    ID BIGINT GENERATED BY DEFAULT AS IDENTITY (START WITH 1) PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR BIGINT,
+    NAME VARCHAR(100)
+);

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-h2.sql

@@ -367,3 +367,14 @@ CREATE TABLE MAP_ELEMENT
     MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
     NAME VARCHAR(100)
 );
+
+CREATE TABLE AUTHOR
+(
+    ID SERIAL PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR BIGINT,
+    NAME VARCHAR(100)
+);

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-hsql.sql

@@ -368,3 +368,14 @@ CREATE TABLE MAP_ELEMENT
     MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
     NAME VARCHAR(100)
 );
+
+CREATE TABLE AUTHOR
+(
+    ID BIGINT GENERATED BY DEFAULT AS IDENTITY (START WITH 1) PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR BIGINT,
+    NAME VARCHAR(100)
+);

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-mariadb.sql

@@ -341,3 +341,14 @@ CREATE TABLE MAP_ELEMENT
     MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
     NAME VARCHAR(100)
 );
+
+CREATE TABLE AUTHOR
+(
+    ID BIGINT AUTO_INCREMENT PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR BIGINT,
+    NAME VARCHAR(100)
+);

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-mssql.sql

@@ -379,3 +379,17 @@ CREATE TABLE MAP_ELEMENT
     MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
     NAME VARCHAR(100)
 );
+
+DROP TABLE BOOK;
+DROP TABLE AUTHOR;
+
+CREATE TABLE AUTHOR
+(
+    ID BIGINT IDENTITY PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR BIGINT,
+    NAME VARCHAR(100)
+);

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-mysql.sql

@@ -346,3 +346,14 @@ CREATE TABLE MAP_ELEMENT
   MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
   NAME VARCHAR(100)
 );
+
+CREATE TABLE AUTHOR
+(
+    ID BIGINT AUTO_INCREMENT PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR BIGINT,
+    NAME VARCHAR(100)
+);

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-oracle.sql

@@ -37,6 +37,9 @@ DROP TABLE MAP_ELEMENT CASCADE CONSTRAINTS PURGE;
 DROP TABLE LIST_ELEMENT CASCADE CONSTRAINTS PURGE;
 DROP TABLE SET_ELEMENT CASCADE CONSTRAINTS PURGE;
 
+DROP TABLE BOOK CASCADE CONSTRAINTS PURGE;
+DROP TABLE AUTHOR CASCADE CONSTRAINTS PURGE;
+
 CREATE TABLE LEGO_SET
 (
     "id1" NUMBER GENERATED by default on null as IDENTITY PRIMARY KEY,
@@ -386,3 +389,14 @@ CREATE TABLE MAP_ELEMENT
     MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
     NAME VARCHAR(100)
 );
+
+CREATE TABLE AUTHOR
+(
+    ID NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR NUMBER,
+    NAME VARCHAR(100)
+);

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.core/JdbcAggregateTemplateIntegrationTests-postgres.sql

@@ -40,6 +40,9 @@ DROP TABLE MAP_ELEMENT;
 DROP TABLE LIST_ELEMENT;
 DROP TABLE SET_ELEMENT;
 
+DROP TABLE BOOK;
+DROP TABLE AUTHOR;
+
 CREATE TABLE LEGO_SET
 (
     "id1" SERIAL PRIMARY KEY,
@@ -408,3 +411,14 @@ CREATE TABLE MAP_ELEMENT
     MULTIPLE_COLLECTIONS_KEY VARCHAR(10),
     NAME VARCHAR(100)
 );
+
+CREATE TABLE AUTHOR
+(
+    ID SERIAL PRIMARY KEY
+);
+
+CREATE TABLE BOOK
+(
+    AUTHOR BIGINT,
+    NAME VARCHAR(100)
+);

spring-data-relational/src/main/java/org/springframework/data/relational/core/conversion/MappingRelationalConverter.java

@@ -504,7 +504,7 @@ public RelationalPropertyValueProvider withContext(ConversionContext context) {
 				entity, contextualizing, context.getPath().getCurrentObject());
 
 		return new ConverterAwareSpELExpressionParameterValueProvider(context, evaluator, getConversionService(),
-				parameterProvider);
+				new ConvertingParameterValueProvider<>( parameterProvider::getParameterValue));
 	}
 
 	private <S> S populateProperties(ConversionContext context, RelationalPersistentEntity<S> entity,