47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
from datetime import datetime, timezone
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from flask_sqlalchemy import event
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from ereuse_devicehub.db import db
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STR_SIZE = 64
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STR_BIG_SIZE = 128
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STR_SM_SIZE = 32
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STR_XSM_SIZE = 16
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class Thing(db.Model):
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"""The base class of all Devicehub resources.
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This is a loose copy of
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`schema.org's Thing class <https://schema.org/Thing>`_
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using only needed fields.
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"""
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__abstract__ = True
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updated = db.Column(db.TIMESTAMP(timezone=True),
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nullable=False,
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index=True,
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server_default=db.text('CURRENT_TIMESTAMP'))
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updated.comment = """The last time Devicehub recorded a change for
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this thing.
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"""
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created = db.Column(db.TIMESTAMP(timezone=True),
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nullable=False,
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index=True,
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server_default=db.text('CURRENT_TIMESTAMP'))
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created.comment = """When Devicehub created this."""
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def __init__(self, **kwargs) -> None:
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# We need to set 'created' before sqlalchemy inits the class
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# to be able to use sorted containers
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self.created = kwargs.get('created', datetime.now(timezone.utc))
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super().__init__(**kwargs)
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def update_object_timestamp(mapper, connection, thing_obj):
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""" This function update the stamptime of field updated """
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thing_obj.updated = datetime.now(timezone.utc)
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def listener_reset_field_updated_in_actual_time(thing_obj):
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""" This function launch a event than listen like a signal when some object is saved """
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event.listen(thing_obj, 'before_update', update_object_timestamp, propagate=True)
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