Update cacheKeyForTree to cache the treeForVendor #279
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If an ember addon has a modified/overrided treeFor* method, the result of this treeFor method won't get cached, according to https://github.com/ember-cli/ember-cli/blob/master/lib/models/addon.js#L728. The
cacheKeyForTree('vendor')
will always returnnull
, so if "ember-fetch" was depended by the app and other addons(e.g ember-data), it will recalculate the "treeForVendor" every time.This PR make sure that the result of "treeForVendor" will be cached.