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"""Functions to interact with mapped classes and instances.""" |
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3
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from . import common, exceptions |
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5
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log = common.logger(__name__) |
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6
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7
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8
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def create(cls, *args): |
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9
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"""Create a new mapped object.""" |
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10
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instance = cls(*args) |
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mapper = _ensure_mapped(instance) |
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12
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if mapper.auto_create: |
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msg = "'create' is called automatically with 'auto_create' enabled" |
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log.warning(msg) |
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if mapper.exists: |
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msg = "{!r} already exists".format(mapper.path) |
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raise exceptions.DuplicateMappingError(msg) |
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return save(instance) |
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def find(cls, *args, create=False): # pylint: disable=redefined-outer-name |
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"""Find a matching mapped object or return None.""" |
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instance = cls(*args) |
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mapper = _ensure_mapped(instance) |
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if mapper.exists: |
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return instance |
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elif create: |
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return save(instance) |
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else: |
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return None |
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37
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def find_all(cls, **kwargs): |
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"""Return a list of all matching mapped objects.""" |
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log.debug((cls, kwargs)) |
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raise NotImplementedError |
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42
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43
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def load(instance): |
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"""Force the loading of a mapped object's file.""" |
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mapper = _ensure_mapped(instance) |
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log.warning("'load' is called automatically") |
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mapper.load() |
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return instance |
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53
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54
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def save(instance): |
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"""Save a mapped object to file.""" |
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mapper = _ensure_mapped(instance) |
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if mapper.auto_save: |
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log.warning("'save' is called automatically with 'auto_save' enabled") |
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if mapper.deleted: |
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msg = "{!r} was deleted".format(mapper.path) |
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raise exceptions.DeletedFileError(msg) |
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65
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if not mapper.exists: |
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mapper.create() |
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68
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mapper.save() |
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return instance |
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72
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def delete(instance): |
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"""Delete a mapped object's file.""" |
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mapper = _ensure_mapped(instance) |
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mapper.delete() |
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return None |
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80
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81
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82
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def _ensure_mapped(obj, *, expected=True): |
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mapper = common.get_mapper(obj) |
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84
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85
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if mapper and not expected: |
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msg = "{!r} is already mapped".format(obj) |
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raise TypeError(msg) |
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89
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if not mapper and expected: |
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msg = "{!r} is not mapped".format(obj) |
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raise TypeError(msg) |
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92
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93
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return mapper |
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94
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jacebrowning /
yorm
