university-final-iot-backend/app/devices/models.py

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from datetime import datetime
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from app import db
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from sqlalchemy.dialects.postgresql import JSON
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class Recording(db.Model):
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__tablename__ = 'recordings'
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id = db.Column(db.Integer, primary_key=True)
recorded_at = db.Column(db.DateTime, index=True,
default=db.func.current_timestamp())
received_at = db.Column(db.DateTime, index=True,
default=db.func.current_timestamp())
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device_id = db.Column(db.Integer, db.ForeignKey('devices.id'))
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record_type = db.Column(db.Integer, nullable=False)
record_value = db.Column(db.String, nullable=False)
raw_record = db.Column(JSON, nullable=True)
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def __init__(self, device_id, record_type,
record_value, recorded_at, raw_json):
self.device_id = int(device_id)
self.record_type = int(record_type)
self.record_value = str(record_value)
self.recorded_at = datetime.fromtimestamp(int(recorded_at))
self.received_at = datetime.utcnow()
self.raw_record = raw_json
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def save(self):
"""
Stores this recording to database
This may raise errors
"""
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db.session.add(self)
db.session.commit()
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def delete(self):
"""
Deletes this recording from database
"""
db.session.delete(self)
db.session.commit()
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@staticmethod
def get_all():
return Recording.query.all()
@staticmethod
def get_many(**kwargs):
"""
Get many recording with given filters as a list
Available filters:
* id
* device_id
* record_type
* recorded_at
* received_at
* record_value (probably useless)
* raw_record (useless)
"""
return Recording.query.filter_by(**kwargs).all()
@staticmethod
def get(**kwargs):
"""
Get recordings with given filters
Available filters:
* id
* device_id
* record_type
* recorded_at
* received_at
* record_value (probably useless)
* raw_record (useless)
"""
return Recording.query.filter_by(**kwargs).first()
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def __repr__(self):
return '<Recording (value=%s, recorded_at=%s)>' % (
self.record_value, self.recorded_at)
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class Device(db.Model):
__tablename__ = 'devices'
id = db.Column(db.Integer, primary_key=True)
created_at = db.Column(db.DateTime,
nullable=False,
default=db.func.current_timestamp())
modified_at = db.Column(db.DateTime,
nullable=False,
default=db.func.current_timestamp(),
onupdate=db.func.current_timestamp())
name = db.Column(db.String, nullable=False)
device_type_id = db.Column(db.Integer, db.ForeignKey('device_types.id'))
device_type = db.relationship("DeviceType", foreign_keys=[device_type_id])
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configuration = db.Column(JSON, nullable=True)
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users = db.relationship("DeviceAssociation",
cascade="save-update, merge, delete")
recordings = db.relationship("Recording",
cascade="save-update, merge, delete")
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def __init__(self, name, configuration=None, device_type=1):
self.name = name
self.configuration = configuration
self.device_type_id = device_type
def save(self):
"""
Stores this device to database
This may raise errors
"""
db.session.add(self)
db.session.commit()
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def delete(self):
"""
Deletes this recording from database
"""
db.session.delete(self)
db.session.commit()
@staticmethod
def get_many(**kwargs):
"""
Get many devices with given filters as a list
Available filters:
* id
* name
* device_type_id
* created_at
* modified_at
* configuration (useless)
"""
return Device.query.filter_by(**kwargs).all()
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@staticmethod
def get_many_for_user(account_id):
"""
Get many devices which are associated to account
"""
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return Device.query.filter(
Device.users.any(account_id=account_id)
).all()
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@staticmethod
def get(**kwargs):
"""
Get device with given filters
Available filters:
* id
* name
* device_type_id
* created_at
* modified_at
* configuration (useless)
"""
return Device.query.filter_by(**kwargs).first()
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@staticmethod
def exists(**kwargs):
"""
Checks if device with all of the given arguments exists
"""
if Device.query.filter_by(**kwargs).first():
return True
return False
def __repr__(self):
return '<Device (name=%s, type=%s)>' % (
self.name, self.device_type_id)
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class DeviceAssociation(db.Model):
__tablename__ = 'device_associations'
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device_id = db.Column(db.Integer, db.ForeignKey('devices.id'),
primary_key=True)
account_id = db.Column(db.Integer, db.ForeignKey('accounts.id'),
primary_key=True)
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access_level = db.Column(db.Integer, db.ForeignKey('access_levels.id'),
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nullable=False)
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def __init__(self, device_id, account_id, access_level=1):
self.device_id = device_id
self.account_id = account_id
self.access_level = access_level
def save(self):
"""
Stores this device association to database
This may raise errors
"""
db.session.add(self)
db.session.commit()
@staticmethod
def get_many(**kwargs):
"""
Get many device associations with given filters as a list
Available filters:
* device_id
* account_id
"""
return DeviceAssociation.query.filter_by(**kwargs).all()
@staticmethod
def get_for_user(account_id):
"""
Get many device associations for user with account id passed in
parameter
"""
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return DeviceAssociation.get_many(account_id=account_id)
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@staticmethod
def get_for_device(device_id):
"""
Get many device associations for device with account id passed in
parameter
"""
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return DeviceAssociation.get_many(device_id=device_id)
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def __repr__(self):
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return '<DeviceAssociation (device_id=%s, accoount_id=%s)>' % (
self.device_id, self.account_id)
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class DeviceType(db.Model):
__tablename__ = 'device_types'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String, nullable=False)
def __init__(self, name):
self.name = name
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def save(self):
"""
Stores this device type to database
This may raise errors
"""
db.session.add(self)
db.session.commit()
@staticmethod
def get_many(**kwargs):
"""
Get many devices types with given filters as a list
Available filters:
* id
* name
"""
return DeviceType.query.filter_by(**kwargs).all()
@staticmethod
def get(**kwargs):
"""
Get device type with given filters
Available filters:
* id
* name
"""
return DeviceType.query.filter_by(**kwargs).first()
@staticmethod
def exists(**kwargs):
"""
Checks if device type with all of the given arguments exists
"""
if DeviceType.query.filter_by(**kwargs).first():
return True
return False
def __repr__(self):
return '<DeviceType (name %s)>' % self.name
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class AccessLevel(db.Model):
__tablename__ = 'access_levels'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String, nullable=False)
def __init__(self, name):
self.name = name
def __repr__(self):
return '<AccessLevel (name %s)>' % self.name