Add ChainableUndefined allowing getattr & getitem #997
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Allows using default values with chains of items or attributes that may
contain undefined values without raising a jinja2.exceptions.UndefinedError.
>>> import jinja2
>>> env = jinja2.Environment(undefined=jinja2.ChainableUndefined)
>>> env.from_string("{{ foo.bar['baz'] | default('val') }}").render()
'val'
Contributor
|
As this was brought up in the Ansible sprint, I wanted to share feedback here that Ansible has implemented a class that performs this same duty: We will still have the need to use ours for the foreseeable future, as we deal with many OSes and users that use the OS provided packages, which means they are likely running very old versions of jinja. |
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Allows using default values with chains of items or attributes that may
contain undefined values without raising a jinja2.exceptions.UndefinedError.
Fixes #977