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Once the datastore is running its important to be able to sort the
results along the lines of various criteria. Lets create a sample
datastore.
First clean up from any other tests.
>>> import os
>>> assert os.system('rm -rf /tmp/test_ds/') == 0
>>> from olpc.datastore import DataStore
>>> from olpc.datastore import backingstore, model
>>> ds = DataStore()
>>> ds.registerBackend(backingstore.FileBackingStore)
>>> dm = model.defaultModel.copy().addField('year', 'int').addField('month', 'string')
>>> assert ds.mount("/tmp/test_ds", {'indexmanager.model' : dm})
>>> a = ds.create(dict(title="Content A", author="Bob", year="1999", month="Jan"), '')
>>> b = ds.create(dict(title="Content B", author="Alice", year="2000", month="Jan"), '')
Find should return both
>>> def find2uids(results): return [i['uid'] for i in results[0]]
>>> ds.complete_indexing()
>>> assert set(find2uids(ds.find())) == set([a,b])
But what if we want the results ordered?
>>> assert find2uids(ds.find(order_by=['title'])) == [a, b]
>>> assert find2uids(ds.find(order_by=['author'])) == [b, a]
By more than one key?
>>> assert find2uids(ds.find(order_by=['month', 'year'])) == [a, b]
and if we want to reverse order it?
>>> assert find2uids(ds.find(order_by=['-title'])) == [b, a]
>>> assert find2uids(ds.find(order_by=['-author'])) == [a, b]
>>> ds.stop()
>>> del ds
>>> assert os.system('rm -rf /tmp/test_ds/') == 0
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