diff --git a/admin/code/LeftAndMain.php b/admin/code/LeftAndMain.php
index d7ff2b56b..5f443cbc9 100644
--- a/admin/code/LeftAndMain.php
+++ b/admin/code/LeftAndMain.php
@@ -779,15 +779,53 @@ class LeftAndMain extends Controller implements PermissionProvider {
$link = Controller::join_links($recordController->Link("show"), $child->ID);
return LeftAndMain_TreeNode::create($child, $link, $controller->isCurrentPage($child))->forTemplate();
};
- $html = $obj->getChildrenAsUL(
- "",
- $titleFn,
- singleton('CMSPagesController'),
- true,
- $childrenMethod,
- $numChildrenMethod,
- $nodeCountThreshold
- );
+
+ // Limit the amount of nodes shown for performance reasons.
+ // Skip the check if we're filtering the tree, since its not clear how many children will
+ // match the filter criteria until they're queried (and matched up with previously marked nodes).
+ $nodeThresholdLeaf = Config::inst()->get('Hierarchy', 'node_threshold_leaf');
+ if($nodeThresholdLeaf && !$filterFunction) {
+ $nodeCountCallback = function($parent, $numChildren) use($controller, $className, $nodeThresholdLeaf) {
+ if($className == 'SiteTree' && $parent->ID && $numChildren > $nodeThresholdLeaf) {
+ return sprintf(
+ '',
+ _t('LeftAndMain.TooManyPages', 'Too many pages'),
+ Controller::join_links(
+ $controller->LinkWithSearch($controller->Link()), '
+ ?view=list&ParentID=' . $parent->ID
+ ),
+ _t(
+ 'LeftAndMain.ShowAsList',
+ 'show as list',
+ 'Show large amount of pages in list instead of tree view'
+ )
+ );
+ }
+ };
+ } else {
+ $nodeCountCallback = null;
+ }
+
+ // If the amount of pages exceeds the node thresholds set, use the callback
+ if($obj->ParentID && $nodeCountCallback) {
+ $html = $nodeCountCallback($obj, $obj->$numChildrenMethod());
+ }
+
+ // Otherwise return the actual tree (which might still filter leaf thresholds on children)
+ if(!$html) {
+ $html = $obj->getChildrenAsUL(
+ "",
+ $titleFn,
+ singleton('CMSPagesController'),
+ true,
+ $childrenMethod,
+ $numChildrenMethod,
+ $nodeCountThreshold,
+ $nodeCountCallback
+ );
+ }
// Wrap the root if needs be.
if(!$rootID) {
diff --git a/admin/css/screen.css b/admin/css/screen.css
index 115b13177..954b63dc4 100644
--- a/admin/css/screen.css
+++ b/admin/css/screen.css
@@ -784,6 +784,9 @@ form.import-form label.left { width: 250px; }
.tree-holder.jstree-apple li.Root > a .jstree-icon, .cms-tree.jstree-apple li.Root > a .jstree-icon { background-position: -56px -36px; }
.tree-holder.jstree-apple li.deletedonlive .text, .cms-tree.jstree-apple li.deletedonlive .text { text-decoration: line-through; }
.tree-holder.jstree-apple li.jstree-checked > a, .tree-holder.jstree-apple li.jstree-checked > a:link, .cms-tree.jstree-apple li.jstree-checked > a, .cms-tree.jstree-apple li.jstree-checked > a:link { background-color: #efe999; }
+.tree-holder.jstree-apple li.readonly, .cms-tree.jstree-apple li.readonly { color: #aaaaaa; padding-left: 18px; }
+.tree-holder.jstree-apple li.readonly a, .tree-holder.jstree-apple li.readonly a:link, .cms-tree.jstree-apple li.readonly a, .cms-tree.jstree-apple li.readonly a:link { margin: 0; padding: 0; }
+.tree-holder.jstree-apple li.readonly .jstree-icon, .cms-tree.jstree-apple li.readonly .jstree-icon { display: none; }
.tree-holder.jstree-apple a, .tree-holder.jstree-apple a:link, .cms-tree.jstree-apple a, .cms-tree.jstree-apple a:link { color: #0073c1; padding: 3px 6px 3px 3px; border: none; display: inline-block; margin-right: 5px; }
.tree-holder.jstree-apple ins, .cms-tree.jstree-apple ins { background-color: transparent; background-image: url(../images/sitetree_ss_default_icons.png); }
.tree-holder.jstree-apple span.badge, .cms-tree.jstree-apple span.badge { clear: both; text-transform: uppercase; display: inline-block; padding: 0px 3px; font-size: 0.75em; line-height: 1em; margin-left: 3px; margin-right: 6px; margin-top: -1px; -webkit-border-radius: 2px 2px; -moz-border-radius: 2px / 2px; border-radius: 2px / 2px; }
diff --git a/admin/scss/_tree.scss b/admin/scss/_tree.scss
index 8d938ca5e..6bbb8ce74 100644
--- a/admin/scss/_tree.scss
+++ b/admin/scss/_tree.scss
@@ -418,6 +418,19 @@
background-color: $color-cms-batchactions-menu-selected-background;
}
}
+ &.readonly {
+ color: $color-text-disabled;
+ padding-left: 18px;
+
+ // Don't show drag icons or required spacing
+ a, a:link {
+ margin: 0;
+ padding: 0;
+ }
+ .jstree-icon {
+ display: none;
+ }
+ }
}
a, a:link {
color: $color-text-blue-link;
@@ -441,6 +454,7 @@
margin-right: 6px;
margin-top: -1px;
@include border-radius(2px, 2px);
+
&.modified, &.addedtodraft {
color: #7E7470;
border: 1px solid #C9B800;
diff --git a/docs/en/changelogs/3.1.0.md b/docs/en/changelogs/3.1.0.md
index 21b550cd4..7fc3890bf 100644
--- a/docs/en/changelogs/3.1.0.md
+++ b/docs/en/changelogs/3.1.0.md
@@ -443,4 +443,7 @@ you can enable those warnings and future-proof your code already.
`<% if "Some...<% end_if %>`
- This change was necessary in order to support inequality operators in comparisons in templates
\ No newline at end of file
+ This change was necessary in order to support inequality operators in comparisons in templates
+ * Hard limit displayed pages in the CMS tree to `500`, and the number of direct children to `250`,
+ to avoid excessive resource usage. Configure through `Hierarchy.node_threshold_total` and `
+ Hierarchy.node_threshold_leaf`. Set to `0` to show tree unrestricted.
diff --git a/docs/en/reference/sitetree.md b/docs/en/reference/sitetree.md
index d6e4a9922..ef1401359 100644
--- a/docs/en/reference/sitetree.md
+++ b/docs/en/reference/sitetree.md
@@ -74,7 +74,7 @@ Hierarchy operations (defined on `[api:Hierarchy]`:
* `$page->AllHistoricalChildren()`: Return all the children this page had, including pages that were deleted from both stage & live.
* `$page->AllChildrenIncludingDeleted()`: Return all children, including those that have been deleted but are still in live.
-## Limiting Hierarchy
+## Allowed Children, Default Child and Root-Level
By default, any page type can be the child of any other page type.
However, there are static properties that can be
@@ -115,9 +115,20 @@ level.
Note that there is no allowed_parents` control. To set this, you will need to specify the `allowed_children` of all other page types to exclude the page type in question.
-## Permission Control
+## Tree Limitations
+SilverStripe limits the amount of initially rendered nodes in order to avoid
+processing delays, usually to a couple of dozen. The value can be configured
+through `[api:Hierarchy::$node_threshold_total]`.
+If a website has thousands of pages, the tree UI metaphor can become an inefficient way
+to manage them. The CMS has an alternative "list view" for this purpose, which allows
+sorting and paging through large numbers of pages in a tabular view.
+
+To avoid exceeding performance constraints of both the server and browser,
+SilverStripe places hard limits on the amount of rendered pages in
+a specific tree leaf, typically a couple of hundred pages.
+The value can be configured through `[api:Hierarchy::$node_threshold_leaf]`.
## Tree Display (Description, Icons and Badges)
diff --git a/forms/TreeDropdownField.php b/forms/TreeDropdownField.php
index 8c1981ff5..c793b9549 100644
--- a/forms/TreeDropdownField.php
+++ b/forms/TreeDropdownField.php
@@ -269,10 +269,50 @@ class TreeDropdownField extends FormField {
. $this->keyField . '\" class=\"class-$child->class"'
. ' . $child->markingClasses() . "\">ID\">" . $child->' . $this->labelField . ' . ""';
- if($isSubTree) {
- return substr(trim($obj->getChildrenAsUL('', $eval, null, true, $this->childrenMethod)), 4, -5);
+ // Limit the amount of nodes shown for performance reasons.
+ // Skip the check if we're filtering the tree, since its not clear how many children will
+ // match the filter criteria until they're queried (and matched up with previously marked nodes).
+ $nodeThresholdLeaf = Config::inst()->get('Hierarchy', 'node_threshold_leaf');
+ if($nodeThresholdLeaf && !$this->filterCallback && !$this->search) {
+ $className = $this->sourceObject;
+ $nodeCountCallback = function($parent, $numChildren) use($className, $nodeThresholdLeaf) {
+ if($className == 'SiteTree' && $parent->ID && $numChildren > $nodeThresholdLeaf) {
+ return sprintf(
+ '',
+ _t('LeftAndMain.TooManyPages', 'Too many pages')
+ );
+ }
+ };
} else {
- return $obj->getChildrenAsUL('class="tree"', $eval, null, true, $this->childrenMethod);
+ $nodeCountCallback = null;
+ }
+
+ if($isSubTree) {
+ $html = $obj->getChildrenAsUL(
+ "",
+ $eval,
+ null,
+ true,
+ $this->childrenMethod,
+ 'numChildren',
+ true, // root call
+ null,
+ $nodeCountCallback
+ );
+ return substr(trim($html), 4, -5);
+ } else {
+ $html = $obj->getChildrenAsUL(
+ 'class="tree"',
+ $eval,
+ null,
+ true,
+ $this->childrenMethod,
+ 'numChildren',
+ true, // root call
+ null,
+ $nodeCountCallback
+ );
+ return $html;
}
}
diff --git a/model/Hierarchy.php b/model/Hierarchy.php
index fa863569e..d4f6c667c 100644
--- a/model/Hierarchy.php
+++ b/model/Hierarchy.php
@@ -15,6 +15,28 @@ class Hierarchy extends DataExtension {
* @var Int
*/
protected $_cache_numChildren;
+
+ /**
+ * @config
+ * @var integer The lower bounds for the amount of nodes to mark. If set, the logic will expand
+ * nodes until it reaches at least this number, and then stops. Root nodes will always
+ * show regardless of this settting. Further nodes can be lazy-loaded via ajax.
+ * This isn't a hard limit. Example: On a value of 10, with 20 root nodes, each having
+ * 30 children, the actual node count will be 50 (all root nodes plus first expanded child).
+ */
+ private static $node_threshold_total = 50;
+
+ /**
+ * @config
+ * @var integer Limit on the maximum children a specific node can display.
+ * Serves as a hard limit to avoid exceeding available server resources
+ * in generating the tree, and browser resources in rendering it.
+ * Nodes with children exceeding this value typically won't display
+ * any children, although this is configurable through the $nodeCountCallback
+ * parameter in {@link getChildrenAsUL()}. "Root" nodes will always show
+ * all children, regardless of this setting.
+ */
+ private static $node_threshold_leaf = 250;
public function augmentSQL(SQLQuery &$query) {
}
@@ -74,21 +96,29 @@ class Hierarchy extends DataExtension {
* @param string $childrenMethod The name of the method used to get children from each object
* @param boolean $rootCall Set to true for this first call, and then to false for calls inside the recursion. You
* should not change this.
- * @param int $nodeCountThreshold The lower bounds for the amount of nodes to mark. If set, the logic will expand
- * nodes until it eaches at least this number, and then stops. Root nodes will always
- * show regardless of this settting. Further nodes can be lazy-loaded via ajax.
- * This isn't a hard limit. Example: On a value of 10, with 20 root nodes, each having
- * 30 children, the actual node count will be 50 (all root nodes plus first expanded child).
+ * @param int $nodeCountThreshold See {@link self::$node_threshold_total}
+ * @param callable $nodeCountCallback Called with the node count, which gives the callback an opportunity
+ * to intercept the query. Useful e.g. to avoid excessive children listings (Arguments: $parent, $numChildren)
*
* @return string
*/
public function getChildrenAsUL($attributes = "", $titleEval = '"" . $child->Title', $extraArg = null,
$limitToMarked = false, $childrenMethod = "AllChildrenIncludingDeleted",
- $numChildrenMethod = "numChildren", $rootCall = true, $nodeCountThreshold = 30) {
+ $numChildrenMethod = "numChildren", $rootCall = true, $nodeCountThreshold = null, $nodeCountCallback = null) {
+
+ if(!is_numeric($nodeCountThreshold)) {
+ $nodeCountThreshold = Config::inst()->get('Hierarchy', 'node_threshold_total');
+ }
if($limitToMarked && $rootCall) {
$this->markingFinished($numChildrenMethod);
}
+
+ if($nodeCountCallback) {
+ $nodeCountWarning = $nodeCountCallback($this->owner, $this->owner->$numChildrenMethod());
+ if($nodeCountWarning) return $nodeCountWarning;
+ }
+
if($this->owner->hasMethod($childrenMethod)) {
$children = $this->owner->$childrenMethod($extraArg);
@@ -110,7 +140,6 @@ class Hierarchy extends DataExtension {
$output .= (is_callable($titleEval)) ? $titleEval($child) : eval("return $titleEval;");
$output .= "\n";
-
$numChildren = $child->$numChildrenMethod();
if(
// Always traverse into opened nodes (they might be exposed as parents of search results)
@@ -119,10 +148,16 @@ class Hierarchy extends DataExtension {
// Otherwise, the remaining nodes are lazy loaded via ajax.
&& $child->isMarked()
) {
- $output .= $child->getChildrenAsUL("", $titleEval, $extraArg, $limitToMarked, $childrenMethod,
- $numChildrenMethod, false, $nodeCountThreshold);
- }
- elseif($child->isTreeOpened()) {
+ // Additionally check if node count requirements are met
+ $nodeCountWarning = $nodeCountCallback ? $nodeCountCallback($child, $numChildren) : null;
+ if($nodeCountWarning) {
+ $output .= $nodeCountWarning;
+ $child->markClosed();
+ } else {
+ $output .= $child->getChildrenAsUL("", $titleEval, $extraArg, $limitToMarked, $childrenMethod,
+ $numChildrenMethod, false, $nodeCountThreshold);
+ }
+ } elseif($child->isTreeOpened()) {
// Since we're not loading children, don't mark it as open either
$child->markClosed();
}
diff --git a/tests/model/HierarchyTest.php b/tests/model/HierarchyTest.php
index d3c43957f..ca7e762bb 100644
--- a/tests/model/HierarchyTest.php
+++ b/tests/model/HierarchyTest.php
@@ -60,11 +60,11 @@ class HierarchyTest extends SapphireTest {
$obj3 = Versioned::get_including_deleted("HierarchyTest_Object", "\"Title\" = 'Obj 3'")->First();
// Check that both obj 3 children are returned
- $this->assertEquals(array("Obj 3a", "Obj 3b"),
+ $this->assertEquals(array("Obj 3a", "Obj 3b", "Obj 3c"),
$obj3->AllHistoricalChildren()->column('Title'));
// Check numHistoricalChildren
- $this->assertEquals(2, $obj3->numHistoricalChildren());
+ $this->assertEquals(3, $obj3->numHistoricalChildren());
}
@@ -94,7 +94,7 @@ class HierarchyTest extends SapphireTest {
public function testNumChildren() {
$this->assertEquals($this->objFromFixture('HierarchyTest_Object', 'obj1')->numChildren(), 0);
$this->assertEquals($this->objFromFixture('HierarchyTest_Object', 'obj2')->numChildren(), 2);
- $this->assertEquals($this->objFromFixture('HierarchyTest_Object', 'obj3')->numChildren(), 2);
+ $this->assertEquals($this->objFromFixture('HierarchyTest_Object', 'obj3')->numChildren(), 3);
$this->assertEquals($this->objFromFixture('HierarchyTest_Object', 'obj2a')->numChildren(), 2);
$this->assertEquals($this->objFromFixture('HierarchyTest_Object', 'obj2b')->numChildren(), 0);
$this->assertEquals($this->objFromFixture('HierarchyTest_Object', 'obj3a')->numChildren(), 2);
@@ -200,29 +200,13 @@ class HierarchyTest extends SapphireTest {
true, // rootCall
$nodeCountThreshold
);
- $parser = new CSSContentParser($html);
- $node2 = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node2,
+ $this->assertTreeContains($html, array($obj2),
'Contains root elements'
);
- $node2a = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]' .
- '/ul/li[@id="' . $obj2a->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node2a,
+ $this->assertTreeContains($html, array($obj2, $obj2a),
'Contains child elements (in correct nesting)'
);
- $node2aa = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]' .
- '/ul/li[@id="' . $obj2a->ID . '"]' .
- '/ul/li[@id="' . $obj2aa->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node2aa,
+ $this->assertTreeContains($html, array($obj2, $obj2a, $obj2aa),
'Contains grandchild elements (in correct nesting)'
);
}
@@ -247,27 +231,13 @@ class HierarchyTest extends SapphireTest {
true,
$nodeCountThreshold
);
- $parser = new CSSContentParser($html);
- $node1 = $parser->getByXpath(
- '//ul/li[@id="' . $obj1->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node1,
+ $this->assertTreeContains($html, array($obj1),
'Contains root elements'
);
- $node2 = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node2,
+ $this->assertTreeContains($html, array($obj2),
'Contains root elements'
);
- $node2a = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]' .
- '/ul/li[@id="' . $obj2a->ID . '"]'
- );
- $this->assertFalse(
- (bool)$node2a,
+ $this->assertTreeNotContains($html, array($obj2, $obj2a),
'Does not contains child elements because they exceed minNodeCount'
);
}
@@ -296,20 +266,12 @@ class HierarchyTest extends SapphireTest {
true,
$nodeCountThreshold
);
- $parser = new CSSContentParser($html);
- $node2 = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node2,
+ $this->assertTreeContains($html, array($obj2),
'Contains root elements'
);
- $node2aa = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]' .
- '/ul/li[@id="' . $obj2a->ID . '"]' .
- '/ul/li[@id="' . $obj2aa->ID . '"]'
+ $this->assertTreeContains($html, array($obj2, $obj2a, $obj2aa),
+ 'Does contain marked children nodes regardless of configured threshold'
);
- $this->assertTrue((bool)$node2aa);
}
public function testGetChildrenAsULMinNodeCountWithFilters() {
@@ -343,21 +305,10 @@ class HierarchyTest extends SapphireTest {
true,
$nodeCountThreshold
);
- $parser = new CSSContentParser($html);
- $node1 = $parser->getByXpath(
- '//ul/li[@id="' . $obj1->ID . '"]'
- );
- $this->assertFalse(
- (bool)$node1,
+ $this->assertTreeNotContains($html, array($obj1),
'Does not contain root elements which dont match the filter'
);
- $node2aa = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]' .
- '/ul/li[@id="' . $obj2a->ID . '"]' .
- '/ul/li[@id="' . $obj2aa->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node2aa,
+ $this->assertTreeContains($html, array($obj2, $obj2a, $obj2aa),
'Contains non-root elements which match the filter'
);
}
@@ -377,8 +328,6 @@ class HierarchyTest extends SapphireTest {
$root->setMarkingFilterFunction(function($record) use($obj2, $obj2a, $obj2aa) {
// Results need to include parent hierarchy, even if we just want to
// match the innermost node.
- // var_dump($record->Title);
- // var_dump(in_array($record->ID, array($obj2->ID, $obj2a->ID, $obj2aa->ID)));
return in_array($record->ID, array($obj2->ID, $obj2a->ID, $obj2aa->ID));
});
$root->markPartialTree($nodeCountThreshold);
@@ -393,25 +342,83 @@ class HierarchyTest extends SapphireTest {
true,
$nodeCountThreshold
);
- $parser = new CSSContentParser($html);
- $node1 = $parser->getByXpath(
- '//ul/li[@id="' . $obj1->ID . '"]'
- );
- $this->assertFalse(
- (bool)$node1,
+ $this->assertTreeNotContains($html, array($obj1),
'Does not contain root elements which dont match the filter'
);
- $node2aa = $parser->getByXpath(
- '//ul/li[@id="' . $obj2->ID . '"]' .
- '/ul/li[@id="' . $obj2a->ID . '"]' .
- '/ul/li[@id="' . $obj2aa->ID . '"]'
- );
- $this->assertTrue(
- (bool)$node2aa,
+ $this->assertTreeContains($html, array($obj2, $obj2a, $obj2aa),
'Contains non-root elements which match the filter'
);
}
+ public function testGetChildrenAsULNodeThresholdLeaf() {
+ $obj1 = $this->objFromFixture('HierarchyTest_Object', 'obj1');
+ $obj2 = $this->objFromFixture('HierarchyTest_Object', 'obj2');
+ $obj2a = $this->objFromFixture('HierarchyTest_Object', 'obj2a');
+ $obj3 = $this->objFromFixture('HierarchyTest_Object', 'obj3');
+ $obj3a = $this->objFromFixture('HierarchyTest_Object', 'obj3a');
+
+ $nodeCountThreshold = 99;
+
+ $root = new HierarchyTest_Object();
+ $root->markPartialTree($nodeCountThreshold);
+ $nodeCountCallback = function($parent, $numChildren) {
+ // Set low enough that it the fixture structure should exceed it
+ if($parent->ID && $numChildren > 2) {
+ return 'Exceeded!';
+ }
+ };
+
+ $html = $root->getChildrenAsUL(
+ "",
+ '"ID . "\">" . $child->Title',
+ null,
+ true, // limit to marked
+ "AllChildrenIncludingDeleted",
+ "numChildren",
+ true,
+ $nodeCountThreshold,
+ $nodeCountCallback
+ );
+ $this->assertTreeContains($html, array($obj1),
+ 'Does contain root elements regardless of count'
+ );
+ $this->assertTreeContains($html, array($obj3),
+ 'Does contain root elements regardless of count'
+ );
+ $this->assertTreeContains($html, array($obj2, $obj2a),
+ 'Contains children which do not exceed threshold'
+ );
+ $this->assertTreeNotContains($html, array($obj3, $obj3a),
+ 'Does not contain children which exceed threshold'
+ );
+ }
+
+ /**
+ * @param String $html [description]
+ * @param array $nodes Breadcrumb path as array
+ * @param String $message
+ */
+ protected function assertTreeContains($html, $nodes, $message = null) {
+ $parser = new CSSContentParser($html);
+ $xpath = '/';
+ foreach($nodes as $node) $xpath .= '/ul/li[@id="' . $node->ID . '"]';
+ $match = $parser->getByXpath($xpath);
+ self::assertThat((bool)$match, self::isTrue(), $message);
+ }
+
+ /**
+ * @param String $html [description]
+ * @param array $nodes Breadcrumb path as array
+ * @param String $message
+ */
+ protected function assertTreeNotContains($html, $nodes, $message = null) {
+ $parser = new CSSContentParser($html);
+ $xpath = '/';
+ foreach($nodes as $node) $xpath .= '/ul/li[@id="' . $node->ID . '"]';
+ $match = $parser->getByXpath($xpath);
+ self::assertThat((bool)$match, self::isFalse(), $message);
+ }
+
}
class HierarchyTest_Object extends DataObject implements TestOnly {
diff --git a/tests/model/HierarchyTest.yml b/tests/model/HierarchyTest.yml
index 7dea96aa9..b3cdd8231 100644
--- a/tests/model/HierarchyTest.yml
+++ b/tests/model/HierarchyTest.yml
@@ -17,6 +17,9 @@ HierarchyTest_Object:
obj3b:
Parent: =>HierarchyTest_Object.obj3
Title: Obj 3b
+ obj3c:
+ Parent: =>HierarchyTest_Object.obj3
+ Title: Obj 3c
obj2aa:
Parent: =>HierarchyTest_Object.obj2a
Title: Obj 2aa