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Make psycopg2 to optional #59

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Make psycopg2 to optional #59

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4 changes: 4 additions & 0 deletions django_sharding_library/fields.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,8 @@
from django.db.backends.postgresql.base import DatabaseWrapper as PostgresDatabaseWrapper
except ImportError:
from django.db.backends.postgresql_psycopg2.base import DatabaseWrapper as PostgresDatabaseWrapper
except ImportError:
PostgresDatabaseWrapper = None

try:
from django.db.models import BigAutoField
Expand Down Expand Up @@ -172,6 +174,8 @@ class ShardForeignKeyStorageField(ShardForeignKeyStorageFieldMixin, ForeignKey):
class BasePostgresShardGeneratedIDField(object):

def __init__(self, *args, **kwargs):
if not PostgresDatabaseWrapper:
raise ImportError("Psycopg2 2.5 or higher is required")

if not hasattr(settings, 'SHARD_EPOCH'):
raise ValueError("PostgresShardGeneratedIDField requires a SHARD_EPOCH to be defined in your settings file.")
Expand Down