public void testDeepLink() {
    Session ssn = SessionManager.getSession();

    DataObject[] users = new DataObject[4];

    DataObject group = getSession().create(getModelName() + ".Group");
    group.set("id", BigInteger.valueOf(users.length));
    group.set("email", "*****@*****.**");
    group.set("name", "SIPB");
    group.save();
    DataAssociation members = (DataAssociation) group.get("members");

    for (int i = 0; i < users.length; i++) {
      users[i] = ssn.create(getModelName() + ".User");
      users[i].set("id", BigInteger.valueOf(i));
      users[i].set("email", "*****@*****.**");
      users[i].set("firstName", "foo");
      users[i].set("lastNames", "bar");
      users[i].save();
      members.add(users[i]);
    }
    group.save();

    DataObject[] images = new DataObject[users.length / 2];
    for (int i = 0; i < images.length; i++) {
      images[i] = ssn.create(getModelName() + ".Image");
      images[i].set("id", BigInteger.valueOf(i));
      byte[] bytes = "This is the image.".getBytes();
      images[i].set("bytes", bytes);
      images[i].save();
    }

    // create link between user i and image i/2 with caption i
    for (int i = 0; i < users.length; i++) {
      // set image
      DataAssociation imageUsers = (DataAssociation) images[i / 2].get("users");
      DataObject link = imageUsers.add(users[i]);
      link.set("caption", String.valueOf(i));
      link.save();
    }

    DataCollection dc = ssn.retrieve(getModelName() + ".Group");
    dc.addEqualsFilter("members.image.link.caption", "0");
    assertEquals(1, dc.size());

    dc = ssn.retrieve(getModelName() + ".User");
    dc.addPath("image.link.caption");
    assertEquals(users.length, dc.size());
    while (dc.next()) {
      assertEquals(dc.get("id").toString(), dc.get("image.link.caption"));
    }

    dc = ssn.retrieve(getModelName() + ".User");
    dc.addPath("image.id");
    assertEquals(users.length, dc.size());
    while (dc.next()) {
      int id = ((BigInteger) dc.get("id")).intValue();
      assertEquals(BigInteger.valueOf(id / 2), dc.get("image.id"));
    }

    DataCollection dcUp = ssn.retrieve(getModelName() + ".User");
    DataCollection dcDown = ssn.retrieve(getModelName() + ".User");
    dcUp.addOrder("image.link.caption asc");
    dcDown.addOrder("image.link.caption desc");
    dcUp.next();
    dcDown.next();
    assertEquals(BigInteger.valueOf(0), dcUp.get("id"));
    assertEquals(BigInteger.valueOf(users.length - 1), dcDown.get("id"));
    dcUp.close();
    dcDown.close();

    dcUp = ssn.retrieve(getModelName() + ".Image");
    dcDown = ssn.retrieve(getModelName() + ".Image");
    dcUp.addOrder("users.link.caption asc");
    dcDown.addOrder("users.link.caption desc");
    dcUp.next();
    dcDown.next();
    assertEquals(BigInteger.valueOf(0), dcUp.get("id"));
    assertEquals(BigInteger.valueOf(images.length - 1), dcDown.get("id"));
    dcUp.close();
    dcDown.close();

    dc = ssn.retrieve(getModelName() + ".Group");
    dc.addFilter("members.image.id = 0");
    assertEquals(2, dc.size());

    dc = ssn.retrieve(getModelName() + ".Image");
    dc.addFilter("users.id = 0 and users.link.caption = '1'");
    assertEquals(0, dc.size());

    dc = ssn.retrieve(getModelName() + ".Group");
    dc.addPath("members.id");
    dc.addFilter("members.image.id = 0 and members.image.link.caption = '1'");
    assertTrue(dc.next());
    assertEquals(BigInteger.valueOf(1), dc.get("members.id"));
    assertFalse(dc.next());
  }
  public void testReferenceLinkAttribute() {
    Session ssn = SessionManager.getSession();
    DataObject user = ssn.create(getModelName() + ".User");
    user.set("id", BigInteger.valueOf(0));
    user.set("email", "*****@*****.**");
    user.set("firstName", "foo");
    user.set("lastNames", "bar");
    user.save();

    DataObject[] images = new DataObject[2];
    for (int i = 0; i < images.length; i++) {
      images[i] = ssn.create(getModelName() + ".Image");
      images[i].set("id", BigInteger.valueOf(i));
      byte[] bytes = "This is the image.".getBytes();
      images[i].set("bytes", bytes);
      images[i].save();
    }

    // set image
    user.set("image", images[0]);
    user.save();

    // retrieve and then update caption
    DataAssociationCursor dac = ((DataAssociation) images[0].get("users")).cursor();
    dac.next();
    assertNull(dac.getLinkProperty("caption"));
    assertEquals(user, dac.getDataObject());
    DataObject link = dac.getLink();
    link.set("caption", "caption");
    link.save();

    dac = ((DataAssociation) images[0].get("users")).cursor();
    dac.next();
    assertEquals("caption", dac.getLinkProperty("caption"));
    assertEquals(1L, ((DataAssociation) images[0].get("users")).size());

    // set new image as image
    user.set("image", images[1]);
    user.save();

    // check that old image is no longer associated with user
    assertEquals(0L, ((DataAssociation) images[0].get("users")).size());

    // check that new image is associated with user and has no caption
    dac = ((DataAssociation) images[1].get("users")).cursor();
    dac.next();
    assertNull(dac.getLinkProperty("caption"));
    assertEquals(1L, ((DataAssociation) images[1].get("users")).size());
  }