36 lines
982 B
Python
36 lines
982 B
Python
from collections import UserDict
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from dataclasses import dataclass, field
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from typing import Dict
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from . import SyncId
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from .model import Model
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@dataclass(frozen=True)
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class ModelStore(UserDict):
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"""Dict of sync ID keys and `Model` values.
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The dict keys must be the sync ID of `Model` values.
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If a non-existent key is accessed, a corresponding `Model` will be
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created, put into the interal `data` dict and returned.
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"""
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data: Dict[SyncId, Model] = field(default_factory=dict)
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def __missing__(self, key: SyncId) -> Model:
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"""When accessing a non-existent model, create and return it."""
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model = Model(sync_id=key)
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self.data[key] = model
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return model
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def __str__(self) -> str:
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"""Provide a nice overview of stored models when `print()` called."""
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return "%s(\n %s\n)" % (
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type(self).__name__,
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"\n ".join(sorted(str(v) for v in self.values())),
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)
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