dhuang commented on a change in pull request #6793: [AIRFLOW-1076] Add get
method for template variable accessor
URL: https://github.com/apache/airflow/pull/6793#discussion_r357293479
##########
File path: docs/macros-ref.rst
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@@ -88,7 +88,12 @@ attributes and methods.
The ``var`` template variable allows you to access variables defined in
Airflow's
UI. You can access them as either plain-text or JSON. If you use JSON, you are
also able to walk nested structures, such as dictionaries like:
-``{{ var.json.my_dict_var.key1 }}``
+``{{ var.json.my_dict_var.key1 }}``.
+
+It is also possible to fetch a variable by string if needed with
+``{{ var.value.get('my.var', 'fallback') }}`` or
Review comment:
This resolves my original reason for adding this method (periods in variable
keys), but that default logic doesn't work because it throws a KeyError first
when it's missing. `Error rendering template: 'Variable my.var does not exist'`
is the error I get from your example.
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