Call function with a list of games to load. It returns the number loaded. Loop until you're happy because you're out of time, you've loaded them all, or you've loaded enough.

Make as many API calls at once as possible. Load games when available and make remaining API calls.

Some unit tests check for particular data: Games in the collection or ratings of a game. If the BGG source or cache files are updated, the tests will fail.

Need to possibly create special test files or test file directory for testing this specific.

Function to read game stats from BGG XML API, store in data frame.

• row per rating
• col per rating, rater's username

Function to read user's collection from BGG XML API, store in data frame.

• Row per game
• Col per rating, own, owned, want, want to trade, etc.

Some games have over 12,000 ratings. API calls return pages of 100 ratings each: That's up to 120 calls per game!

When loading ratings, specify max number of pages to load.

When loading XML files, if use-cache flag is set, load from disk instead of API.
When loading from API, if make-cache flag is set, store a copy on disk for later use.

Note, for 100 games in a collection, this will be at least 100 "thing" files.

For a given user, get a list of users who have games in common with them

FILE:

Invalid username specified

CONSOLE:
[1] "loading: 2 of 2, 8BITIFISH"
INFO [2017-11-08 14:41:26] XML cache.path: xmlcache/collection/username=8BITIFISH.xml
Getting: https://boardgamegeek.com/xmlapi2/collection?username=8BITIFISH&subtype=boardgame&stats=1&brief=1
OK (HTTP 200).Caching: xmlcache/collection/username=8BITIFISH.xml
Error in thing.attr["objectid", ] : incorrect number of dimensions

users as nodes. edges are based on affinity: games in common formula tbd