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        "author": "Lenar Imamutdinov",
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        "description": "# Lagring: asset storage for Flask\n\n\n## Requirements\n\n- SQLAlchemy\n- Flask\n- PostgreSQL 9.4+\n\n## Installation\n\n    pip install lagring\n\nIf you want to use `ImageAsset` class you have to install Pillow as well.\n\n## How to use it\n\n0. Configure your Flask app to have necessary config options:\n\n    Parameter          | Meaning\n    -------------------|--------------------------------------------------\n    ASSET_STORAGE_ROOT | Path to the directory where assets will be stored\n    ASSET_URL_ROOT     | Asset URL invariable part\n\n1.  Create storage instance:\n\n    ```python\n        from lagring import FlaskLagring\n\n        storage = FlaskLagring()\n        storage.init_app(app)\n    ```\n\n2. Derive your SQLAlchemy model from `storage.Entity` class:\n\n    ```python\n        from lagring import Asset\n\n        class File(db.Model, storage.Entity):\n            id = db.Column(db.Integer, primary_key=True)\n            file = Asset()\n    ```\n\n    Note that JSONB field `_assets` will be added to the model (PostgreSQL 9.4+).\n    You can change the name by overriding `lagring.Entity.asset_data_field` method.\n\n3. Put something to that asset field:\n\n    ```python\n        new_file = File()\n        db.session.add(new_file)\n        db.session.flush()\n        new_file.file = '/some/local/path/filename'\n        db.session.commit()\n    ```\n\n    The model instance must have a valid id on asset assignment, so you have to call `flush()`\n    before that.\n\n4. Then you can use the asset like this:\n\n    ```python\n        # get asset URL\n        url = new_file.file.url\n        # get asset path\n        path = new_file.file.abs_path\n        # delete the asset\n        del new_file.file\n    ```\n\n5. Besides the basic `Asset` class, there are also `ImageAsset` and `DirectoryAsset` to store\nsomething more specific and have some processing on upload (no docs for that yet, please see\nthe code).",
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