Fix where query criteria with multiple associations joins

schema/src/main/java/com/introproventures/graphql/jpa/query/schema/impl/GraphQLJpaQueryFactory.java

@@ -1108,12 +1108,23 @@ protected Predicate getObjectFieldPredicate(
 
                 AbstractQuery<?> query = environment.getRoot();
                 Boolean isFetch = environment.getLocalContext();
-                Boolean isOptional = isOptionalAttribute(attribute);
-
-                From<?, ?> context = (isSubquery(query) || isCountQuery(query) || !isFetch)
-                    ? reuseJoin(from, objectField.getName(), isOptional)
-                    : reuseFetch(from, objectField.getName(), isOptional);
-
+                boolean isOptional = isOptionalAttribute(attribute);
+                List<Map<String, Object>> logicalArguments = Optional
+                    .ofNullable(environment.getArgument(logical.name()))
+                    .filter(List.class::isInstance)
+                    .map(List.class::cast)
+                    .orElseGet(List::of);
+
+                From<?, ?> context;
+                if (logicalArguments.stream().filter(it -> it.containsKey(objectField.getName())).count() > 1) {
+                    context =
+                        isOptional ? from.join(objectField.getName(), JoinType.LEFT) : from.join(objectField.getName());
+                } else {
+                    context =
+                        (isSubquery(query) || isCountQuery(query) || !isFetch)
+                            ? reuseJoin(from, objectField.getName(), isOptional)
+                            : reuseFetch(from, objectField.getName(), isOptional);
+                }
                 return getArgumentPredicate(
                     cb,
                     context,

schema/src/test/java/com/introproventures/graphql/jpa/query/converter/GraphQLJpaConverterTests.java

@@ -179,6 +179,42 @@ public void criteriaTester3() {
         assertThat(result).hasSize(1);
     }
 
+    @Test
+    @Transactional
+    public void criteriaTesterMultipleJoinWhereCriteria() {
+        CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+
+        CriteriaQuery<TaskEntity> tasksQuery = cb.createQuery(TaskEntity.class);
+        Root<TaskEntity> task = tasksQuery.from(TaskEntity.class);
+
+        Join<TaskEntity, TaskVariableEntity> taskVariableEntityJoin1 = task.join("variables");
+
+        Predicate var1 = cb.and(
+            cb.equal(taskVariableEntityJoin1.get("name"), "variable2"),
+            cb.equal(taskVariableEntityJoin1.get("value"), new VariableValue<>(Boolean.TRUE))
+        );
+
+        taskVariableEntityJoin1.on(var1);
+        taskVariableEntityJoin1.alias("var1");
+
+        Join<TaskEntity, TaskVariableEntity> taskVariableEntityJoin2 = task.join("variables");
+        Predicate var2 = cb.and(
+            cb.equal(taskVariableEntityJoin2.get("name"), "variable1"),
+            cb.equal(taskVariableEntityJoin2.get("value"), new VariableValue<>(new String("data")))
+        );
+
+        taskVariableEntityJoin2.on(var2);
+        taskVariableEntityJoin2.alias("var2");
+
+        tasksQuery.select(task);
+        // when:
+        List<TaskEntity> result = entityManager.createQuery(tasksQuery).getResultList();
+
+        // then:
+        assertThat(result).isNotEmpty();
+        assertThat(result).hasSize(1);
+    }
+
     @Test
     @Transactional
     public void criteriaTester4() {
@@ -838,6 +874,51 @@ public void queryTasksVariablesWhereWithExplicitANDEXISTSByNameAndValueCriteria(
         assertThat(result.toString()).isEqualTo(expected);
     }
 
+    @Test
+    public void queryTasksVariablesWhereWithExplicitANDByMultipleNameAndValueCriteria() {
+        //given
+        String query =
+            "query {" +
+            "  Tasks(where: {" +
+            "    status: {EQ: COMPLETED}" +
+            "    AND: [" +
+            "      {" +
+            "        variables: {" +
+            "          name: {EQ: \"variable1\"}" +
+            "          value: {EQ: \"data\"} }" +
+            "      }" +
+            "      {" +
+            "        variables: {" +
+            "          name: {EQ: \"variable2\"}" +
+            "          value: {EQ: true} }" +
+            "      }" +
+            "    ]" +
+            "  }) {" +
+            "    select {" +
+            "      id" +
+            "      status" +
+            "      variables {" +
+            "        name" +
+            "        value" +
+            "      }" +
+            "    }" +
+            "  }" +
+            "}";
+
+        String expected =
+            "{Tasks={select=[" +
+            "{id=1, status=COMPLETED, variables=[" +
+            "{name=variable2, value=true}, " +
+            "{name=variable1, value=data}]}" +
+            "]}}";
+
+        //when
+        Object result = executor.execute(query).getData();
+
+        // then
+        assertThat(result.toString()).isEqualTo(expected);
+    }
+
     @Test
     public void queryTasksVariablesWhereWithEXISTSByNameAndValueCriteria() {
         //given

tests/gatling/src/main/resources/data.sql

@@ -1090,3 +1090,10 @@ insert into INTEGRATION_CONTEXT (id, client_id, client_name, execution_id, proce
 	('2', '1', 'serviceTask', '2', '1'),
 	('3', '1', 'serviceTask', '3', '1');
 
+insert into TASK_PROCESS_VARIABLE (task_id, process_variable_id) values
+    (1,1),
+    (1,2),
+    (1,3),
+    (1,4),
+    (1,5),
+    (1,6);