Unable to reference attributes by path

[MrHash]

Would need to be able to reference embedded attributes by dot notation paths.

[graste]

I suggest we change the getValue() method on the Entity to use the AttributePath::getAttributeValueByPath() method like we do similarly to get the root type on an attribute or to get the path or value path for attributes etc.

[graste]

ping @shrink0r The setValue method only works for the attributes of the current entity and not for nested stuff. When we introduce getValue to actually work more like a getValueByPath method should we adjust the setValue as well?

[graste]

As the getValue method name is already a candidate for collisions with attributes people use in their schemas we will make changes along the following (example):

• getValue($attribute_name) => get($name, $interpret_as_path = false)
• setValue(…) => set(…)

The get method will then by default only get attributes by their concrete name as that is consistent with the set method and doesn't involve magically getting nested attributes. The boolean flag argument will be used to trigger getting nested attributes from an entity. This can then be used in code that generically iterates over stuff or exporters, renderers, or similar that need quick access to deeply nested values. Even though the boolean flag is a bit smelly it's probably better than introducing another method like valueByPath or similar as we can't use getValueByPath as that introduces another possible method name collision.

[graste]

ping @shrink0r