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devicehub-teal/ereuse_devicehub/resources/models.py

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from datetime import datetime, timezone
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from flask_sqlalchemy import event
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from ereuse_devicehub.db import db
STR_SIZE = 64
STR_BIG_SIZE = 128
STR_SM_SIZE = 32
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STR_XSM_SIZE = 16
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class Thing(db.Model):
"""The base class of all Devicehub resources.
This is a loose copy of
`schema.org's Thing class <https://schema.org/Thing>`_
using only needed fields.
"""
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__abstract__ = True
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updated = db.Column(
db.TIMESTAMP(timezone=True),
nullable=False,
index=True,
server_default=db.text('CURRENT_TIMESTAMP'),
)
updated.comment = """The last time Devicehub recorded a change for
this thing.
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"""
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created = db.Column(
db.TIMESTAMP(timezone=True),
nullable=False,
index=True,
server_default=db.text('CURRENT_TIMESTAMP'),
)
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
# to be able to use sorted containers
self.created = kwargs.get('created', datetime.now(timezone.utc))
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super().__init__(**kwargs)
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def delete(self):
db.session.delete(self)
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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)