Clean filepaths in asset feeds

[digitalsadhu]

I'm still not entirely sure how much it matters (It might very well matter) but asset feed hashes are now created by hashing the whole contents of the asset feed which will produce different hashes if the feed is created on different machines with different paths to assets.

This can be fixed in 1 of 2 way:

• Go back to hashing ids rather than contents of the asset feed
• Clean the file property of each item in the asset feed by making it relative instead of absolute.