protected function addIsVersioningNecessary(&$script)
{
$peerClass = $this->builder->getStubPeerBuilder()->getClassname();
$script .= "\n/**\n * Checks whether the current state must be recorded as a version\n *\n * @param PropelPDO \$con An optional PropelPDO connection to use.\n *\n * @return boolean\n */\npublic function isVersioningNecessary(\$con = null)\n{\n if (\$this->alreadyInSave) {\n return false;\n }\n\n if (\$this->enforceVersion) {\n return true;\n }\n\n if ({$peerClass}::isVersioningEnabled() && (\$this->isNew() || \$this->isModified() || \$this->isDeleted())) {\n return true;\n }";
foreach ($this->behavior->getVersionableFks() as $fk) {
$fkGetter = $this->builder->getFKPhpNameAffix($fk, $plural = false);
$script .= "\n if (null !== (\$object = \$this->get{$fkGetter}(\$con)) && \$object->isVersioningNecessary(\$con)) {\n return true;\n }\n";
}
foreach ($this->behavior->getVersionableReferrers() as $fk) {
if ($fk->isLocalPrimaryKey()) {
$fkGetter = $this->builder->getRefFKPhpNameAffix($fk);
$script .= "\n if (\$this->single{$fkGetter}) {\n // to avoid infinite loops, emulate in save\n \$this->alreadyInSave = true;\n\n if (\$this->single{$fkGetter}->isVersioningNecessary(\$con)) {\n \$this->alreadyInSave = false;\n\n return true;\n }\n\n \$this->alreadyInSave = false;\n }\n";
} else {
$fkGetter = $this->builder->getRefFKPhpNameAffix($fk, $plural = true);
$script .= "\n if (\$this->coll{$fkGetter}) {\n // to avoid infinite loops, emulate in save\n \$this->alreadyInSave = true;\n\n foreach (\$this->get{$fkGetter}(null, \$con) as \$relatedObject) {\n if (\$relatedObject->isVersioningNecessary(\$con)) {\n \$this->alreadyInSave = false;\n\n return true;\n }\n }\n\n \$this->alreadyInSave = false;\n }\n";
}
}
$script .= "\n\n return false;\n}\n";
}