tobgu/pyrsistent
Ver no GitHub`setdefault`, or some superior functionality as part of `transform()`
Open
#95 aberto em 3 de fev. de 2017
enhancementhelp wanted
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Description
Consider the following code:
class ApplicationState(PClass):
shared_resources = pset_field(Injectable)
# ...
class ExtractedState(PClass):
applications = pmap_field(str, ApplicationState)
def extract(tfstate):
result = {}
for mod in tfstate['modules']:
for injectable in _extract_resources_from_module(mod):
app_state = result.setdefault(injectable.app,
{"shared_resources": set(),
"service_resources": {}})
app_state["shared_resources"].add(injectable)
return ExtractedState.create(freeze({"applications": result}))
Constructing the pyrsistent objects is quite annoying, which is why I'm doing it with mutable objects, due to lack of setdefault or "create a default object in transform()". Ideally I'd do:
extracted_state = ExtractedState()
extracted_state = extracted_state.transform(
["applications", "newapp", "shared_resources"], lambda ps: ps.add(obj))
but since newapp doesn't exist it blows up...