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_r357294186
##########
File path: airflow/models/taskinstance.py
##########
@@ -1178,34 +1178,60 @@ def get_template_context(self, session=None) ->
Dict[str, Any]:
class VariableAccessor:
"""
- Wrapper around Variable. This way you can get variables in
templates by using
- {var.value.your_variable_name}.
+ Wrapper around Variable. This way you can get variables in
+ templates by using {{ var.value.variable_name }} or
+ {{ var.value.get('variable_name', 'fallback') }}.
"""
def __init__(self):
self.var = None
- def __getattr__(self, item):
+ def __getattr__(
+ self,
+ item: str,
+ default_var: Any = Variable._Variable__NO_DEFAULT_SENTINEL,
+ ):
self.var = Variable.get(item)
return self.var
def __repr__(self):
return str(self.var)
+ @staticmethod
+ def get(
+ item: str,
+ default_var: Any = Variable._Variable__NO_DEFAULT_SENTINEL,
+ ):
+ self.var = Variable.get(item, default_var=default_var)
+ return self.var
+
class VariableJsonAccessor:
"""
- Wrapper around deserialized Variables. This way you can get
variables
- in templates by using {var.json.your_variable_name}.
+ Wrapper around Variable. This way you can get variables in
+ templates by using {{ var.json.variable_name }} or
+ {{ var.json.get('variable_name', {'fall': 'back'}) }}.
"""
def __init__(self):
self.var = None
- def __getattr__(self, item):
- self.var = Variable.get(item, deserialize_json=True)
+ def __getattr__(
+ self,
+ item: str,
+ default_var: Any = Variable._Variable__NO_DEFAULT_SENTINEL,
Review comment:
yep had thought I was actually using `_getattr_` when I was doing `self.var`
in `get()`, removed.
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