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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
nope, but that avoids the hassle of maintaining the related property when changes are done to one of the others.
note: the explanation is written just below... ;p
is it necessary to use object decorator?
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it's not "needed", but it's a better design (less storage, and no "duplicated data" stored). As usual, it's a trade off, ofc: no redundant data, but more "costy" since it needs some computations to get the actual data.
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