gn3: genodb: Read only the most recent genotype matrix.

The genotype database format now supports versioning of matrices. So, we
update genodb.py to return only the most recent genotype matrix.

* gn3/genodb.py (GenotypeDatabase.matrix): Return only the most recent
genotype matrix.

1 files changed, 1 insertions, 1 deletions

diff --git a/gn3/genodb.py b/gn3/genodb.py
index 62043d0..96bded6 100644
--- a/gn3/genodb.py
+++ b/gn3/genodb.py
@@ -17,7 +17,7 @@ class GenotypeDatabase:
     def get_metadata(self, hash, metadata):
         return self.txn.get(hash + b':' + metadata.encode())
     def matrix(self):
-        hash = self.get(b'current')
+        hash = self.get(b'current')[0:self.hash_length]
         return Matrix(self, hash)
 
 class Matrix():