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<?php
require_once 'thirdparty/spyc/spyc.php';
/**
* Uses the Spyc library to parse a YAML document (see http://yaml.org).
* YAML is a simple markup languages that uses tabs and colons instead of the more verbose XML tags,
* and because of this much better for developers creating files by hand.
*
* The contents of the YAML file are broken into three levels:
* - Top level: class names - Page and ErrorPage. This is the name of the dataobject class that should be created.
* The fact that ErrorPage is actually a subclass is irrelevant to the system populating the database.
* Each identifier you specify delimits a new database record.
* This means that every record needs to have an identifier, whether you use it or not.
* - Third level: fields - each field for the record is listed as a 3rd level entry.
* In most cases, the field's raw content is provided.
* However, if you want to define a relationship, you can do so using "=>"
*
* There are a couple of lines like this:
* <code>
* Parent: =>Page.about
* </code>
* This will tell the system to set the ParentID database field to the ID of the Page object with the identifier 'about'.
* This can be used on any has-one or many-many relationship.
* Note that we use the name of the relationship (Parent), and not the name of the database field (ParentID)
*
* On many-many relationships, you should specify a comma separated list of values.
* <code>
* MyRelation: =>Class.inst1,=>Class.inst2,=>Class.inst3
* </code>
*
* An crucial thing to note is that the YAML file specifies DataObjects, not database records.
* The database is populated by instantiating DataObject objects, setting the fields listed, and calling write().
* This means that any onBeforeWrite() or default value logic will be executed as part of the test.
* This forms the basis of our testURLGeneration() test above.
*
* For example, the URLSegment value of Page.staffduplicate is the same as the URLSegment value of Page.staff.
* When the fixture is set up, the URLSegment value of Page.staffduplicate will actually be my-staff-2.
*
* Finally, be aware that requireDefaultRecords() is not called by the database populator -
* so you will need to specify standard pages such as 404 and home in your YAML file.
*
* <code>
* Page:
* home:
* Title: Home
* about:
* Title: About Us
* staff:
* Title: Staff
* URLSegment: my-staff
* Parent: =>Page.about
* staffduplicate:
* Title: Staff
* URLSegment: my-staff
* Parent: =>Page.about
* products:
* Title: Products
* ErrorPage:
* 404:
* Title: Page not Found
* ErrorCode: 404
* </code>
*
* @package framework
* @subpackage core
*
* @see http://code.google.com/p/spyc/
*
* @todo Write unit test for YamlFixture
*/
class YamlFixture extends Object {
/**
* Absolute path to the .yml fixture file
*
* @var string
*/
protected $fixtureFile;
/**
* Array of fixture items
*
* @var array
*/
protected $fixtureDictionary;
/**
* @param String Absolute file path, or relative path to {@link Director::baseFolder()}
*/
function __construct($fixtureFile) {
if(!Director::is_absolute($fixtureFile)) $fixtureFile = Director::baseFolder().'/'. $fixtureFile;
if(!file_exists($fixtureFile)) {
throw new InvalidArgumentException('YamlFixture::__construct(): Fixture path "' . $fixtureFile . '" not found');
}
$this->fixtureFile = $fixtureFile;
parent::__construct();
}
/**
* @return String Absolute file path
*/
function getFixtureFile() {
return $this->fixtureFile;
}
/**
* Get the ID of an object from the fixture.
* @param $className The data class, as specified in your fixture file. Parent classes won't work
* @param $identifier The identifier string, as provided in your fixture file
*/
public function idFromFixture($className, $identifier) {
if(isset($this->fixtureDictionary[$className][$identifier])) {
return $this->fixtureDictionary[$className][$identifier];
} else {
return false;
}
}
/**
* Return all of the IDs in the fixture of a particular class name.
*
* @return A map of fixture-identifier => object-id
*/
public function allFixtureIDs($className) {
if(isset($this->fixtureDictionary[$className])) {
return $this->fixtureDictionary[$className];
} else {
return false;
}
}
/**
* Get an object from the fixture.
*
* @param $className The data class, as specified in your fixture file. Parent classes won't work
* @param $identifier The identifier string, as provided in your fixture file
*/
public function objFromFixture($className, $identifier) {
$id = $this->idFromFixture($className, $identifier);
if($id) return DataObject::get_by_id($className, $id);
}
/**
* Load a YAML fixture file into the database.
* Once loaded, you can use idFromFixture() and objFromFixture() to get items from the fixture.
*
* Caution: In order to support reflexive relations which need a valid object ID,
* the record is written twice: first after populating all non-relational fields,
* then again after populating all relations (has_one, has_many, many_many).
*/
public function saveIntoDatabase(DataModel $model) {
// We have to disable validation while we import the fixtures, as the order in
// which they are imported doesnt guarantee valid relations until after the
// import is complete.
$validationenabled = DataObject::get_validation_enabled();
DataObject::set_validation_enabled(false);
$parser = new Spyc();
$fixtureContent = $parser->loadFile($this->fixtureFile);
$this->fixtureDictionary = array();
foreach($fixtureContent as $dataClass => $items) {
if(ClassInfo::exists($dataClass)) {
$this->writeDataObject($model, $dataClass, $items);
} else {
$this->writeSQL($dataClass, $items);
}
}
DataObject::set_validation_enabled($validationenabled);
}
/**
* Writes the fixture into the database using DataObjects
*
* @param string $dataClass
* @param array $items
*/
protected function writeDataObject($model, $dataClass, $items) {
foreach($items as $identifier => $fields) {
$obj = $model->$dataClass->newObject();
// If an ID is explicitly passed, then we'll sort out the initial write straight away
// This is just in case field setters triggered by the population code in the next block
// Call $this->write(). (For example, in FileTest)
if(isset($fields['ID'])) {
$obj->ID = $fields['ID'];
// The database needs to allow inserting values into the foreign key column (ID in our case)
$conn = DB::getConn();
if(method_exists($conn, 'allowPrimaryKeyEditing')) $conn->allowPrimaryKeyEditing(ClassInfo::baseDataClass($dataClass), true);
$obj->write(false, true);
if(method_exists($conn, 'allowPrimaryKeyEditing')) $conn->allowPrimaryKeyEditing(ClassInfo::baseDataClass($dataClass), false);
}
// Populate the dictionary with the ID
if($fields) foreach($fields as $fieldName => $fieldVal) {
if($obj->many_many($fieldName) || $obj->has_many($fieldName) || $obj->has_one($fieldName)) continue;
$obj->$fieldName = $this->parseFixtureVal($fieldVal);
}
$obj->write();
// has to happen before relations in case a class is referring to itself
$this->fixtureDictionary[$dataClass][$identifier] = $obj->ID;
// Populate all relations
if($fields) foreach($fields as $fieldName => $fieldVal) {
if($obj->many_many($fieldName) || $obj->has_many($fieldName)) {
$parsedItems = array();
$items = preg_split('/ *, */',trim($fieldVal));
foreach($items as $item) {
$parsedItems[] = $this->parseFixtureVal($item);
}
$obj->write();
if($obj->has_many($fieldName)) {
$obj->getComponents($fieldName)->setByIDList($parsedItems);
} elseif($obj->many_many($fieldName)) {
$obj->getManyManyComponents($fieldName)->setByIDList($parsedItems);
}
} elseif($obj->has_one($fieldName)) {
$obj->{$fieldName . 'ID'} = $this->parseFixtureVal($fieldVal);
}
}
$obj->write();
//If LastEdited was set in the fixture, set it here
if (array_key_exists('LastEdited', $fields)) {
$manip = array($dataClass => array("command" => "update", "id" => $obj->id,
"fields" => array("LastEdited" => "'".$this->parseFixtureVal($fields['LastEdited'])."'")));
DB::manipulate($manip);
}
}
}
/**
* Writes the fixture into the database directly using a database manipulation
*
* @param string $table
* @param array $items
*/
protected function writeSQL($table, $items) {
foreach($items as $identifier => $fields) {
$manipulation = array($table => array("fields" => array(), "command" => "insert"));
foreach($fields as $fieldName=> $fieldVal) {
$manipulation[$table]["fields"][$fieldName] = "'".$this->parseFixtureVal($fieldVal)."'";
}
DB::manipulate($manipulation);
$this->fixtureDictionary[$table][$identifier] = DB::getGeneratedID($table);
}
}
/**
* Parse a value from a fixture file. If it starts with => it will get an ID from the fixture dictionary
*/
protected function parseFixtureVal($fieldVal) {
// Parse a dictionary reference - used to set foreign keys
if(substr($fieldVal,0,2) == '=>') {
list($a, $b) = explode('.', substr($fieldVal,2), 2);
return $this->fixtureDictionary[$a][$b];
// Regular field value setting
} else {
return $fieldVal;
}
}
}
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