Bug 965590

Summary: [rfe] Provide method to detect empty Container
Product: [Fedora] Fedora Reporter: Lukáš Zachar <lzachar>
Component: python-nitrateAssignee: Petr Šplíchal <psplicha>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 19CC: fholec, ohudlick, psplicha
Target Milestone: ---Keywords: FutureFeature
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OS: Unspecified   
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Fixed In Version: Doc Type: Enhancement
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Last Closed: 2015-02-18 11:11:41 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Lukáš Zachar 2013-05-21 11:50:12 UTC
Description of problem:

Please provide a way to query whether nitrate.Container is empty. 

My typical use case is to call method on every item but it is difficult to warn user that nothing can be processed.

I'd like to be able to do something similar to:
if nitrate.Collection.is_empty(): log.warning("Nothing to process here")
for item in nitrate.Collection: process(item)

In the current state I need to use private property _items, which feels like a workaround and IMHO should be avoided:
if not nitrate.Collection._items: log.warning("Nothing to process here")

Comment 1 Petr Šplíchal 2013-10-29 17:17:11 UTC
This should be fixed as Container class now provides number of
items included (which is used when converting into bool):

https://github.com/psss/python-nitrate/commit/5661b106

>>> case = TestCase(101398)
>>> print case.tags
'test'
>>> bool(case.tags)
True
>>> case.tags.remove(Tag('test'))
>>> bool(case.tags)
False

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