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docs(codecs): thread the connection config in the SchemaCodec example #1549

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docs(codecs): thread the connection config in the SchemaCodec example #1549

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16 changes: 13 additions & 3 deletions src/datajoint/builtin_codecs/schema.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,11 @@ class SchemaCodec(Codec, register=False):
- ``_build_path()``: Construct storage path from context
- ``_get_backend()``: Get storage backend by name

Both helpers take a ``config`` and fall back to the global ``dj.config``
without one. Read it off ``key["_config"]`` and pass it through, as below: it
is the calling connection's config, and in a process holding connections for
several users the global one belongs to none of them.

Comparison with Hash-addressed:
- **Schema-addressed** (this): Path from schema structure, no dedup
- **Hash-addressed**: Path from content hash, automatic dedup
Expand All @@ -39,13 +44,18 @@ class MyCodec(SchemaCodec):

def encode(self, value, *, key=None, store_name=None):
schema, table, field, pk = self._extract_context(key)
path, _ = self._build_path(schema, table, field, pk, ext=".dat")
backend = self._get_backend(store_name)
config = (key or {}).get("_config")
path, _ = self._build_path(
schema, table, field, pk, ext=".dat",
store_name=store_name, config=config,
)
backend = self._get_backend(store_name, config=config)
backend.put_buffer(serialize(value), path)
return {"path": path, "store": store_name, ...}

def decode(self, stored, *, key=None):
backend = self._get_backend(stored.get("store"))
config = (key or {}).get("_config")
backend = self._get_backend(stored.get("store"), config=config)
return MyRef(stored, backend)

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