[ci skip] Fix shard docs #49658
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[ci skip] Fix shard docs #49658
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We never explained how migrations paths work for shards. This fixes that and also adds the appropriate class setup. You no longer need to set a `default` shard as of rails#48353. In addition, `ApplicationRecord` should be used for the non-sharded db that also serves as the tenant/shard router. Then shards should get their own connection class since the schema differs.
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We never explained how migrations paths work for shards. This fixes that and also adds the appropriate class setup. You no longer need to set a
defaultshard as of #48353. In addition,ApplicationRecordshould be used for the non-sharded db that also serves as the tenant/shard router. Then shards should get their own connection class since the schema differs.