Correctly convert enum array values.

We now correctly convert array write values. Previously, enum arrays were converted to null as these fell through the entity conversion.

Closes #1593

spring-data-r2dbc/src/test/java/org/springframework/data/r2dbc/core/PostgresReactiveDataAccessStrategyTests.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.r2dbc.core;
 
+import static org.mockito.Mockito.*;
 import static org.springframework.data.r2dbc.testing.Assertions.*;
 
 import io.r2dbc.postgresql.codec.Interval;
@@ -33,9 +34,13 @@ import org.springframework.core.convert.converter.Converter;
 import org.springframework.data.convert.ReadingConverter;
 import org.springframework.data.convert.WritingConverter;
 import org.springframework.data.r2dbc.convert.EnumWriteSupport;
+import org.springframework.data.r2dbc.core.StatementMapper.InsertSpec;
 import org.springframework.data.r2dbc.dialect.PostgresDialect;
 import org.springframework.data.r2dbc.mapping.OutboundRow;
 import org.springframework.data.relational.core.sql.SqlIdentifier;
+import org.springframework.r2dbc.core.Parameter;
+import org.springframework.r2dbc.core.PreparedOperation;
+import org.springframework.r2dbc.core.binding.BindTarget;
 
 /**
  * {@link PostgresDialect} specific tests for {@link ReactiveDataAccessStrategy}.
@@ -60,6 +65,20 @@ public class PostgresReactiveDataAccessStrategyTests extends ReactiveDataAccessS
 		assertThat(row).withColumn("myarray").hasValueInstanceOf(Integer[][].class);
 	}
 
+	@Test // GH-1593
+	void shouldConvertEnumsCorrectly() {
+
+		StatementMapper mapper = strategy.getStatementMapper();
+		MyEnum[] value = { MyEnum.ONE };
+		InsertSpec insert = mapper.createInsert("table").withColumn("my_col", Parameter.from(value));
+		PreparedOperation<?> mappedObject = mapper.getMappedObject(insert);
+
+		BindTarget bindTarget = mock(BindTarget.class);
+		mappedObject.bindTo(bindTarget);
+
+		verify(bindTarget).bind(0, new String[] { "ONE" });
+	}
+
 	@Test // gh-161
 	void shouldConvertNullArrayToDriverArrayType() {