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Add PathField class for storing pathlib objects
Add tests for pathfield class Add database fixture for generating test databases
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from pathlib import Path
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from typing import Optional
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import peewee
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__title__ = "peewee-plus"
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__version__ = "0.1.0"
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__license__ = "MIT"
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__summary__ = "Various extensions, helpers, and utilities for Peewee"
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__url__ = "https://github.com/enpaul/peewee-plus/"
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__authors__ = ["Ethan Paul <24588726+enpaul@users.noreply.github.com>"]
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__all__ = ["PathField"]
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class PathField(peewee.CharField):
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"""Field class for storing file paths
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This field can be used to simply store pathlib paths in the database without needing to
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cast to ``str`` on write and ``Path`` on read.
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It can also serve to save paths relative to a root path defined at runtime. This can be
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useful when an application stores files under a directory defined in the app configuration,
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such as in an environment variable or a config file.
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For example, if a model is defined like below to load a path from the ``MYAPP_DATA_DIR``
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environment variable:
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.. code-block:: python
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class MyModel(peewee.Model):
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some_path = peewee_plus.PathField(relative_to=Path(os.environ["MYAPP_DATA_DIR"]))
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p1 = MyModel(some_path=Path(os.environ["MYAPP_DATA_DIR"]) / "foo.json").save()
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p2 = MyModel(some_path=Path("bar.json")).save()
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Then the data directory can be changed without updating the database, and the code can
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still rely on the database always returning absolute paths:
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::
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>>> os.environ["MYAPP_DATA_DIR"] = "/etc/myapp"
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>>> [item.some_path for item in MyModel.select()]
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[PosixPath('/etc/myapp/foo.json'), PosixPath('/etc/myapp/bar.json')]
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>>>
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>>> os.environ["MYAPP_DATA_DIR"] = "/opt/myapp/data"
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>>> [item.some_path for item in MyModel.select()]
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[PosixPath('/opt/myapp/data/foo.json'), PosixPath('/opt/myapp/data/bar.json')]
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>>>
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:param relative_to: Optional root path that paths should be stored relative to. If specified
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then values being set will be converted to relative paths under this path,
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and values being read will always be absolute paths under this path.
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"""
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def __init__(self, *args, relative_to: Optional[Path] = None, **kwargs):
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super().__init__(*args, **kwargs)
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self.relative_to = relative_to
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def db_value(self, value: Path) -> str:
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"""Serialize a :class:`pathlib.Path` to a database string"""
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if value.is_absolute() and self.relative_to:
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value = value.relative_to(self.relative_to)
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return super().db_value(value)
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def python_value(self, value: str) -> Path:
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"""Serialize a database string to a :class:`pathlib.path` object"""
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return (
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self.relative_to / Path(super().python_value(value))
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if self.relative_to
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else Path(super().python_value(value))
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)
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tests/fixtures.py
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tests/fixtures.py
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import uuid
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import peewee
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import pytest
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@pytest.fixture(scope="function")
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def fakedb(tmp_path):
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"""Create a temporary pho-database (fakedb) for testing fields"""
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sqlite = peewee.SqliteDatabase(
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tmp_path / f"{uuid.uuid4()}.db",
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pragmas={
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"journal_mode": "wal",
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"cache_size": -1 * 64000,
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"foreign_keys": 1,
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"ignore_check_constraints": 0,
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"synchronous": 0,
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},
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)
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yield sqlite
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tests/test_pathfield.py
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tests/test_pathfield.py
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# pylint: disable=redefined-outer-name
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# pylint: disable=missing-class-docstring
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# pylint: disable=too-few-public-methods
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# pylint: disable=unused-import
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from pathlib import Path
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import peewee
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import peewee_plus
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from .fixtures import fakedb
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def test_conversion(fakedb):
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"""Test basic usage of PathField for roundtrip compatibility"""
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class TestModel(peewee.Model):
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class Meta:
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database = fakedb
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name = peewee.CharField()
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some_path = peewee_plus.PathField()
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fakedb.create_tables([TestModel])
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path1 = Path("foo", "bar", "baz")
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model1 = TestModel(name="one", some_path=path1)
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model1.save()
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model1 = TestModel.get(TestModel.name == "one")
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assert model1.some_path == path1
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assert not model1.some_path.is_absolute()
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path2 = Path("/etc", "fizz", "buzz")
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model2 = TestModel(name="two", some_path=path2)
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model2.save()
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model2 = TestModel.get(TestModel.name == "two")
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assert model2.some_path == path2
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assert model2.some_path.is_absolute()
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def test_relative_to(fakedb):
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"""Test usage of the ``relative_to`` parameter"""
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base_path = Path("/etc", "foobar")
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class TestModel(peewee.Model):
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class Meta:
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database = fakedb
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name = peewee.CharField()
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some_path = peewee_plus.PathField(relative_to=base_path)
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fakedb.create_tables([TestModel])
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path1 = Path("foo", "bar", "baz")
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model1 = TestModel(name="one", some_path=path1)
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model1.save()
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model1 = TestModel.get(TestModel.name == "one")
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assert model1.some_path.is_absolute()
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assert model1.some_path == base_path / path1
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path2 = Path("fizz", "buzz")
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model2 = TestModel(name="two", some_path=base_path / path2)
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model2.save()
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model2 = TestModel.get(TestModel.name == "two")
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assert model2.some_path.is_absolute()
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assert model2.some_path == base_path / path2
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