Silverstripe 3.1.x getting values from Parent - content-management-system

Question

I would like to get a generic function working for getting Data in Template of a Page and if the property is not set, getting it from the Parent or Parents Parent and so on. With generic I mean independent of Relations like db, HasOne, HasMany, ManyMany. Let's say I have this for ManyMany but would like to detect if it's a Object, HasManyList or ManyManyList or a value. Is anything like this built in or how would you go about?
function ManyManyUpUntilHit($ComponentName){
$Component = $this->getManyManyComponents($ComponentName);
if($Component && $Component->exists())
return $Component;
$Parent = $this->Parent();
if(is_object($Parent) && $Parent->ID != 0){
return $Parent->ManyManyUpUntilHit($ComponentName);
} else {
return null;
}
}
in template:
$ManyManyUpUntilHit(Teaser)

Answer 1

There is no in built method to do this in Silverstripe. You will need to write your own function to do this.
Here is an example to get a page's has_one, has_many or many_many resource by parameter, or go up the site tree until a resource is found, or we hit a root page:
function getComponentRecursive($componentName) {
// has_one
if ($this->has_one($componentName)) {
$component = $this->getComponent($componentName);
if (isset($component) && $component->ID)
{
return $component;
}
}
// has_many
if ($this->has_many($componentName)) {
$components = $this->getComponents($componentName);
if (isset($components) && $components->count())
{
return $components;
}
}
// many_many
if ($this->many_many($componentName)) {
$components = $this->getManyManyComponents($componentName);
if (isset($components) && $components->count())
{
return $components;
}
}
if ($this->ParentID != 0)
{
return $this->Parent()->getComponentRecursive($componentName);
}
return false;
}