feature: update input with response if input and output is the same object

src/main/kotlin/fr/postgresjson/connexion/Connection.kt

@@ -44,12 +44,19 @@ class Connection(
         values: List<Any?>,
         block: (QueryResult, R?) -> Unit
     ): R? {
+        val primaryObject = values.firstOrNull {
+            it is EntityI<*> && typeReference.type.typeName == it::class.java.name
+        } as R?
         val result = exec(sql, compileArgs(values))
         val json = result.rows[0].getString(0)
         return if (json === null) {
             null
+        } else {
+            if (primaryObject != null) {
+                serializer.deserialize(json, primaryObject)
             } else {
                 serializer.deserialize(json, typeReference)
+            }
         }.also {
             block(result, it)
         }

src/test/kotlin/fr/postgresjson/RequesterTest.kt

@@ -68,6 +68,19 @@ class RequesterTest: TestAbstract() {
         assertEquals("myName", obj.name)
     }
 
+    @Test
+    fun `call selectOne on function with object`() {
+        val resources = File(this::class.java.getResource("/sql/function").toURI())
+        val obj2 = ObjTest("original")
+        val obj: ObjTest = Requester(getConnextion())
+            .addFunction(resources)
+            .getFunction("test_function_object")
+            .selectOne("resource" to obj2)!!
+
+        assertEquals("changedName", obj.name)
+        assertEquals("changedName", obj2.name)
+    }
+
     @Test
     fun `call selectOne on query`() {
         val resources = File(this::class.java.getResource("/sql/query").toURI())

src/test/resources/fixtures/init.sql

@@ -63,4 +63,13 @@ BEGIN
     INTO result, total
     LIMIT "limit" OFFSET "offset";
 END;
+$$;
+
+CREATE OR REPLACE FUNCTION test_function_object (inout resource json)
+    LANGUAGE plpgsql
+AS
 $$
+BEGIN
+    resource = json_build_object('id', 1, 'name', 'changedName');
+END;
+$$;

src/test/resources/sql/function/Test/function_test_object.sql

@@ -0,0 +1,8 @@
+CREATE OR REPLACE FUNCTION test_function_object (inout resource json)
+LANGUAGE plpgsql
+AS
+$$
+BEGIN
+    resource = json_build_object('id', 1, 'name', 'changedName');
+END;
+$$