import pathlib from contextlib import suppress from fractions import Fraction from itertools import chain from operator import attrgetter from typing import Dict, List, Set from boltons import urlutils from citext import CIText from ereuse_utils.naming import HID_CONVERSION_DOC, Naming from flask import g from more_itertools import unique_everseen from sqlalchemy import BigInteger, Boolean, Column, Enum as DBEnum, Float, ForeignKey, Integer, \ Sequence, SmallInteger, Unicode, inspect, text from sqlalchemy.dialects.postgresql import UUID from sqlalchemy.ext.declarative import declared_attr from sqlalchemy.ext.hybrid import hybrid_property from sqlalchemy.orm import ColumnProperty, backref, relationship, validates from sqlalchemy.util import OrderedSet from sqlalchemy_utils import ColorType from stdnum import imei, meid from teal.db import CASCADE_DEL, POLYMORPHIC_ID, POLYMORPHIC_ON, ResourceNotFound, URL, \ check_lower, check_range, IntEnum from teal.enums import Layouts from teal.marshmallow import ValidationError from teal.resource import url_for_resource from ereuse_devicehub.db import db from ereuse_devicehub.resources.enums import BatteryTechnology, CameraFacing, ComputerChassis, \ DataStorageInterface, DisplayTech, PrinterTechnology, RamFormat, RamInterface, Severity, TransferState from ereuse_devicehub.resources.models import STR_SM_SIZE, Thing, listener_reset_field_updated_in_actual_time from ereuse_devicehub.resources.user.models import User class Device(Thing): """Base class for any type of physical object that can be identified. Device partly extends `Schema's IndividualProduct `_, adapting it to our use case. A device requires an identification method, ideally a serial number, although it can be identified only with tags too. More ideally both methods are used. Devices can contain ``Components``, which are just a type of device (it is a recursive relationship). """ id = Column(BigInteger, Sequence('device_seq'), primary_key=True) id.comment = """The identifier of the device for this database. Used only internally for software; users should not use this. """ type = Column(Unicode(STR_SM_SIZE), nullable=False) hid = Column(Unicode(), check_lower('hid'), unique=False) hid.comment = """The Hardware ID (HID) is the ID traceability systems use to ID a device globally. This field is auto-generated from Devicehub using literal identifiers from the device, so it can re-generated *offline*. """ + HID_CONVERSION_DOC model = Column(Unicode(), check_lower('model')) model.comment = """The model of the device in lower case. The model is the unambiguous, as technical as possible, denomination for the product. This field, among others, is used to identify the product. """ manufacturer = Column(Unicode(), check_lower('manufacturer')) manufacturer.comment = """The normalized name of the manufacturer, in lower case. Although as of now Devicehub does not enforce normalization, users can choose a list of normalized manufacturer names from the own ``/manufacturers`` REST endpoint. """ serial_number = Column(Unicode(), check_lower('serial_number')) serial_number.comment = """The serial number of the device in lower case.""" brand = db.Column(CIText()) brand.comment = """A naming for consumers. This field can represent several models, so it can be ambiguous, and it is not used to identify the product. """ generation = db.Column(db.SmallInteger, check_range('generation', 0)) generation.comment = """The generation of the device.""" version = db.Column(db.CIText()) version.comment = """The version code of this device, like v1 or A001.""" weight = Column(Float(decimal_return_scale=4), check_range('weight', 0.1, 5)) weight.comment = """The weight of the device in Kg.""" width = Column(Float(decimal_return_scale=4), check_range('width', 0.1, 5)) width.comment = """The width of the device in meters.""" height = Column(Float(decimal_return_scale=4), check_range('height', 0.1, 5)) height.comment = """The height of the device in meters.""" depth = Column(Float(decimal_return_scale=4), check_range('depth', 0.1, 5)) depth.comment = """The depth of the device in meters.""" color = Column(ColorType) color.comment = """The predominant color of the device.""" production_date = Column(db.DateTime) production_date.comment = """The date of production of the device. This is timezone naive, as Workbench cannot report this data with timezone information. """ variant = Column(db.CIText()) variant.comment = """A variant or sub-model of the device.""" sku = db.Column(db.CIText()) sku.comment = """The Stock Keeping Unit (SKU), i.e. a merchant-specific identifier for a product or service. """ image = db.Column(db.URL) image.comment = "An image of the device." owner_id = db.Column(UUID(as_uuid=True), db.ForeignKey(User.id), nullable=False, default=lambda: g.user.id) owner = db.relationship(User, primaryjoin=owner_id == User.id) allocated = db.Column(Boolean, default=False) allocated.comment = "device is allocated or not." _NON_PHYSICAL_PROPS = { 'id', 'type', 'created', 'updated', 'parent_id', 'owner_id', 'hid', 'production_date', 'color', # these are only user-input thus volatile 'width', 'height', 'depth', 'weight', 'brand', 'generation', 'production_date', 'variant', 'version', 'sku', 'image', 'allocated' } __table_args__ = ( db.Index('device_id', id, postgresql_using='hash'), db.Index('type_index', type, postgresql_using='hash') ) def __init__(self, **kw) -> None: super().__init__(**kw) self.set_hid() @property def actions(self) -> list: """All the actions where the device participated, including: 1. Actions performed directly to the device. 2. Actions performed to a component. 3. Actions performed to a parent device. Actions are returned by descending ``created`` time. """ return sorted(chain(self.actions_multiple, self.actions_one), key=lambda x: x.created) @property def problems(self): """Current actions with severity.Warning or higher. There can be up to 3 actions: current Snapshot, current Physical action, current Trading action. """ from ereuse_devicehub.resources.device import states from ereuse_devicehub.resources.action.models import Snapshot actions = set() with suppress(LookupError, ValueError): actions.add(self.last_action_of(Snapshot)) with suppress(LookupError, ValueError): actions.add(self.last_action_of(*states.Physical.actions())) with suppress(LookupError, ValueError): actions.add(self.last_action_of(*states.Trading.actions())) return self._warning_actions(actions) @property def physical_properties(self) -> Dict[str, object or None]: """Fields that describe the physical properties of a device. :return A dictionary: - Column. - Actual value of the column or None. """ # todo ensure to remove materialized values when start using them # todo or self.__table__.columns if inspect fails return {c.key: getattr(self, c.key, None) for c in inspect(self.__class__).attrs if isinstance(c, ColumnProperty) and not getattr(c, 'foreign_keys', None) and c.key not in self._NON_PHYSICAL_PROPS} @property def url(self) -> urlutils.URL: """The URL where to GET this device.""" return urlutils.URL(url_for_resource(Device, item_id=self.id)) @property def rate(self): """The last Rate of the device.""" with suppress(LookupError, ValueError): from ereuse_devicehub.resources.action.models import Rate return self.last_action_of(Rate) @property def price(self): """The actual Price of the device, or None if no price has ever been set.""" with suppress(LookupError, ValueError): from ereuse_devicehub.resources.action.models import Price return self.last_action_of(Price) @property def trading(self): """The actual trading state, or None if no Trade action has ever been performed to this device.""" from ereuse_devicehub.resources.device import states with suppress(LookupError, ValueError): action = self.last_action_of(*states.Trading.actions()) return states.Trading(action.__class__) @property def physical(self): """The actual physical state, None otherwise.""" from ereuse_devicehub.resources.device import states with suppress(LookupError, ValueError): action = self.last_action_of(*states.Physical.actions()) return states.Physical(action.__class__) @property def traking(self): """The actual traking state, None otherwise.""" from ereuse_devicehub.resources.device import states with suppress(LookupError, ValueError): action = self.last_action_of(*states.Traking.actions()) return states.Traking(action.__class__) @property def usage(self): """The actual usage state, None otherwise.""" from ereuse_devicehub.resources.device import states with suppress(LookupError, ValueError): action = self.last_action_of(*states.Usage.actions()) return states.Usage(action.__class__) @property def physical_possessor(self): """The actual physical possessor or None. The physical possessor is the Agent that has physically the device. It differs from legal owners, usufructuarees or reserves in that the physical possessor does not have a legal relation per se with the device, but it is the one that has it physically. As an example, a transporter could be a physical possessor of a device although it does not own it legally. Note that there can only be one physical possessor per device, and :class:`ereuse_devicehub.resources.action.models.Receive` changes it. """ pass # TODO @cayop uncomment this lines for link the possessor with the device # from ereuse_devicehub.resources.action.models import Receive # with suppress(LookupError): # action = self.last_action_of(Receive) # return action.agent_to @property def working(self): """A list of the current tests with warning or errors. A device is working if the list is empty. This property returns, for the last test performed of each type, the one with the worst ``severity`` of them, or ``None`` if no test has been executed. """ from ereuse_devicehub.resources.action.models import Test current_tests = unique_everseen((e for e in reversed(self.actions) if isinstance(e, Test)), key=attrgetter('type')) # last test of each type return self._warning_actions(current_tests) @declared_attr def __mapper_args__(cls): """Defines inheritance. From `the guide `_ """ args = {POLYMORPHIC_ID: cls.t} if cls.t == 'Device': args[POLYMORPHIC_ON] = cls.type return args def set_hid(self): with suppress(TypeError): self.hid = Naming.hid(self.type, self.manufacturer, self.model, self.serial_number) def last_action_of(self, *types): """Gets the last action of the given types. :raise LookupError: Device has not an action of the given type. """ try: # noinspection PyTypeHints actions = self.actions actions.sort(key=lambda x: x.created) return next(e for e in reversed(actions) if isinstance(e, types)) except StopIteration: raise LookupError('{!r} does not contain actions of types {}.'.format(self, types)) def _warning_actions(self, actions): return sorted(ev for ev in actions if ev.severity >= Severity.Warning) def __lt__(self, other): return self.id < other.id def __str__(self) -> str: return '{0.t} {0.id}: model {0.model}, S/N {0.serial_number}'.format(self) def __format__(self, format_spec): if not format_spec: return super().__format__(format_spec) v = '' if 't' in format_spec: v += '{0.t} {0.model}'.format(self) if 's' in format_spec: superclass = self.__class__.mro()[1] if not isinstance(self, Device) and superclass != Device: assert issubclass(superclass, Thing) v += superclass.__name__ + ' ' v += '{0.manufacturer}'.format(self) if self.serial_number: v += ' ' + self.serial_number.upper() return v class DisplayMixin: """Base class for the Display Component and the Monitor Device.""" size = Column(Float(decimal_return_scale=1), check_range('size', 2, 150), nullable=True) size.comment = """The size of the monitor in inches.""" technology = Column(DBEnum(DisplayTech)) technology.comment = """The technology the monitor uses to display the image. """ resolution_width = Column(SmallInteger, check_range('resolution_width', 10, 20000), nullable=True) resolution_width.comment = """The maximum horizontal resolution the monitor can natively support in pixels. """ resolution_height = Column(SmallInteger, check_range('resolution_height', 10, 20000), nullable=True) resolution_height.comment = """The maximum vertical resolution the monitor can natively support in pixels. """ refresh_rate = Column(SmallInteger, check_range('refresh_rate', 10, 1000)) contrast_ratio = Column(SmallInteger, check_range('contrast_ratio', 100, 100000)) touchable = Column(Boolean) touchable.comment = """Whether it is a touchscreen.""" @hybrid_property def aspect_ratio(self): """The aspect ratio of the display, as a fraction: ``X/Y``. Regular values are ``4/3``, ``5/4``, ``16/9``, ``21/9``, ``14/10``, ``19/10``, ``16/10``. """ if self.resolution_height and self.resolution_width: return Fraction(self.resolution_width, self.resolution_height) return 0 # noinspection PyUnresolvedReferences @aspect_ratio.expression def aspect_ratio(cls): # The aspect ratio to use as SQL in the DB # This allows comparing resolutions return db.func.round(cls.resolution_width / cls.resolution_height, 2) @hybrid_property def widescreen(self): """Whether the monitor is considered to be widescreen. Widescreen monitors are those having a higher aspect ratio greater than 4/3. """ # We add a tiny extra to 4/3 to avoid precision errors return self.aspect_ratio > 4.001 / 3 def __str__(self) -> str: if self.size: return '{0.t} {0.serial_number} {0.size}in ({0.aspect_ratio}) {0.technology}'.format(self) return '{0.t} {0.serial_number} 0in ({0.aspect_ratio}) {0.technology}'.format(self) def __format__(self, format_spec: str) -> str: v = '' if 't' in format_spec: v += '{0.t} {0.model}'.format(self) if 's' in format_spec: v += '({0.manufacturer}) S/N {0.serial_number}'.format(self) if self.size: v += '– {0.size}in ({0.aspect_ratio}) {0.technology}'.format(self) else: v += '– 0in ({0.aspect_ratio}) {0.technology}'.format(self) return v class Computer(Device): """A chassis with components inside that can be processed automatically with Workbench Computer. Computer is broadly extended by ``Desktop``, ``Laptop``, and ``Server``. The property ``chassis`` defines it more granularly. """ id = Column(BigInteger, ForeignKey(Device.id), primary_key=True) chassis = Column(DBEnum(ComputerChassis), nullable=True) chassis.comment = """The physical form of the computer. It is a subset of the Linux definition of DMI / DMI decode. """ ethereum_address = Column(CIText(), unique=True, default=None) deposit = Column(Integer, check_range('deposit', min=0, max=100), default=0) owner_id = db.Column(UUID(as_uuid=True), db.ForeignKey(User.id), nullable=False, default=lambda: g.user.id) author = db.relationship(User, primaryjoin=owner_id == User.id) transfer_state = db.Column(IntEnum(TransferState), default=TransferState.Initial, nullable=False) transfer_state.comment = TransferState.__doc__ receiver_id = db.Column(UUID(as_uuid=True), db.ForeignKey(User.id), nullable=True) receiver = db.relationship(User, primaryjoin=receiver_id == User.id) deliverynote_address = db.Column(CIText(), nullable=True) def __init__(self, *args, **kwargs) -> None: if args: chassis = ComputerChassis(args[0]) super().__init__(chassis=chassis, **kwargs) else: super().__init__(*args, **kwargs) @property def actions(self) -> list: return sorted(chain(super().actions, self.actions_parent)) @property def ram_size(self) -> int: """The total of RAM memory the computer has.""" return sum(ram.size or 0 for ram in self.components if isinstance(ram, RamModule)) @property def data_storage_size(self) -> int: """The total of data storage the computer has.""" return sum(ds.size or 0 for ds in self.components if isinstance(ds, DataStorage)) @property def processor_model(self) -> str: """The model of one of the processors of the computer.""" return next((p.model for p in self.components if isinstance(p, Processor)), None) @property def graphic_card_model(self) -> str: """The model of one of the graphic cards of the computer.""" return next((p.model for p in self.components if isinstance(p, GraphicCard)), None) @property def network_speeds(self) -> List[int]: """Returns two values representing the speeds of the network adapters of the device. 1. The max Ethernet speed of the computer, 0 if ethernet adaptor exists but its speed is unknown, None if no eth adaptor exists. 2. The max WiFi speed of the computer, 0 if computer has WiFi but its speed is unknown, None if no WiFi adaptor exists. """ speeds = [None, None] for net in (c for c in self.components if isinstance(c, NetworkAdapter)): speeds[net.wireless] = max(net.speed or 0, speeds[net.wireless] or 0) return speeds @property def privacy(self): """Returns the privacy of all ``DataStorage`` components when it is not None. """ return set( privacy for privacy in (hdd.privacy for hdd in self.components if isinstance(hdd, DataStorage)) if privacy ) def add_mac_to_hid(self, components_snap=None): """Returns the Naming.hid with the first mac of network adapter, following an alphabetical order. """ self.set_hid() if not self.hid: return components = self.components if components_snap is None else components_snap macs_network = [c.serial_number for c in components if c.type == 'NetworkAdapter' and c.serial_number is not None] macs_network.sort() mac = macs_network[0] if macs_network else '' if not mac or mac in self.hid: return mac = f"-{mac}" self.hid += mac def __format__(self, format_spec): if not format_spec: return super().__format__(format_spec) v = '' if 't' in format_spec: v += '{0.chassis} {0.model}'.format(self) elif 's' in format_spec: v += '({0.manufacturer})'.format(self) if self.serial_number: v += ' S/N ' + self.serial_number.upper() return v class Desktop(Computer): pass class Laptop(Computer): layout = Column(DBEnum(Layouts)) layout.comment = """Layout of a built-in keyboard of the computer, if any. """ class Server(Computer): pass class Monitor(DisplayMixin, Device): id = Column(BigInteger, ForeignKey(Device.id), primary_key=True) class ComputerMonitor(Monitor): pass class TelevisionSet(Monitor): pass class Projector(Monitor): pass class Mobile(Device): """A mobile device consisting of smartphones, tablets, and cellphones.""" id = Column(BigInteger, ForeignKey(Device.id), primary_key=True) imei = Column(BigInteger) imei.comment = """The International Mobile Equipment Identity of the smartphone as an integer. """ meid = Column(Unicode) meid.comment = """The Mobile Equipment Identifier as a hexadecimal string. """ ram_size = db.Column(db.Integer, check_range('ram_size', min=128, max=36000)) ram_size.comment = """The total of RAM of the device in MB.""" data_storage_size = db.Column(db.Integer, check_range('data_storage_size', 0, 10 ** 8)) data_storage_size.comment = """The total of data storage of the device in MB""" display_size = db.Column(db.Float(decimal_return_scale=1), check_range('display_size', min=0.1, max=30.0)) display_size.comment = """The total size of the device screen""" @validates('imei') def validate_imei(self, _, value: int): if not imei.is_valid(str(value)): raise ValidationError('{} is not a valid imei.'.format(value)) return value @validates('meid') def validate_meid(self, _, value: str): if not meid.is_valid(value): raise ValidationError('{} is not a valid meid.'.format(value)) return value class Smartphone(Mobile): pass class Tablet(Mobile): pass class Cellphone(Mobile): pass class Component(Device): """A device that can be inside another device.""" id = Column(BigInteger, ForeignKey(Device.id), primary_key=True) parent_id = Column(BigInteger, ForeignKey(Computer.id)) parent = relationship(Computer, backref=backref('components', lazy=True, cascade=CASCADE_DEL, order_by=lambda: Component.id, collection_class=OrderedSet), primaryjoin=parent_id == Computer.id) __table_args__ = ( db.Index('parent_index', parent_id, postgresql_using='hash'), ) def similar_one(self, parent: Computer, blacklist: Set[int]) -> 'Component': """Gets a component that: * has the same parent. * Doesn't generate HID. * Has same physical properties. :param parent: :param blacklist: A set of components to not to consider when looking for similar ones. """ assert self.hid is None, 'Don\'t use this method with a component that has HID' component = self.__class__.query \ .filter_by(parent=parent, hid=None, owner_id=self.owner_id, **self.physical_properties) \ .filter(~Component.id.in_(blacklist)) \ .first() if not component: raise ResourceNotFound(self.type) return component @property def actions(self) -> list: return sorted(chain(super().actions, self.actions_components)) class JoinedComponentTableMixin: @declared_attr def id(cls): return Column(BigInteger, ForeignKey(Component.id), primary_key=True) class GraphicCard(JoinedComponentTableMixin, Component): memory = Column(SmallInteger, check_range('memory', min=1, max=10000)) memory.comment = """The amount of memory of the Graphic Card in MB.""" class DataStorage(JoinedComponentTableMixin, Component): """A device that stores information.""" size = Column(Integer, check_range('size', min=1, max=10 ** 8)) size.comment = """The size of the data-storage in MB.""" interface = Column(DBEnum(DataStorageInterface)) @property def privacy(self): """Returns the privacy compliance state of the data storage. This is, the last erasure performed to the data storage. """ from ereuse_devicehub.resources.action.models import EraseBasic try: ev = self.last_action_of(EraseBasic) except LookupError: ev = None return ev def __format__(self, format_spec): v = super().__format__(format_spec) if 's' in format_spec: v += ' – {} GB'.format(self.size // 1000 if self.size else '?') return v class HardDrive(DataStorage): pass class SolidStateDrive(DataStorage): pass class Motherboard(JoinedComponentTableMixin, Component): slots = Column(SmallInteger, check_range('slots', min=0)) slots.comment = """PCI slots the motherboard has.""" usb = Column(SmallInteger, check_range('usb', min=0)) firewire = Column(SmallInteger, check_range('firewire', min=0)) serial = Column(SmallInteger, check_range('serial', min=0)) pcmcia = Column(SmallInteger, check_range('pcmcia', min=0)) bios_date = Column(db.Date) bios_date.comment = """The date of the BIOS version.""" ram_slots = Column(db.SmallInteger, check_range('ram_slots')) ram_max_size = Column(db.Integer, check_range('ram_max_size')) class NetworkMixin: speed = Column(SmallInteger, check_range('speed', min=10, max=10000)) speed.comment = """The maximum speed this network adapter can handle, in mbps. """ wireless = Column(Boolean, nullable=False, default=False) wireless.comment = """Whether it is a wireless interface.""" def __format__(self, format_spec): v = super().__format__(format_spec) if 's' in format_spec: v += ' – {} Mbps'.format(self.speed) return v class NetworkAdapter(JoinedComponentTableMixin, NetworkMixin, Component): pass class Processor(JoinedComponentTableMixin, Component): """The CPU.""" speed = Column(Float, check_range('speed', 0.1, 15)) speed.comment = """The regular CPU speed.""" cores = Column(SmallInteger, check_range('cores', 1, 10)) cores.comment = """The number of regular cores.""" threads = Column(SmallInteger, check_range('threads', 1, 20)) threads.comment = """The number of threads per core.""" address = Column(SmallInteger, check_range('address', 8, 256)) address.comment = """The address of the CPU: 8, 16, 32, 64, 128 or 256 bits.""" abi = Column(Unicode, check_lower('abi')) abi.comment = """The Application Binary Interface of the processor.""" class RamModule(JoinedComponentTableMixin, Component): """A stick of RAM.""" size = Column(SmallInteger, check_range('size', min=128, max=17000)) size.comment = """The capacity of the RAM stick.""" speed = Column(SmallInteger, check_range('speed', min=100, max=10000)) interface = Column(DBEnum(RamInterface)) format = Column(DBEnum(RamFormat)) class SoundCard(JoinedComponentTableMixin, Component): pass class Display(JoinedComponentTableMixin, DisplayMixin, Component): """The display of a device. This is used in all devices that have displays but that it is not their main part, like laptops, mobiles, smart-watches, and so on; excluding ``ComputerMonitor`` and ``TelevisionSet``. """ pass class Battery(JoinedComponentTableMixin, Component): wireless = db.Column(db.Boolean) wireless.comment = """If the battery can be charged wirelessly.""" technology = db.Column(db.Enum(BatteryTechnology)) size = db.Column(db.Integer, nullable=False) size.comment = """Maximum battery capacity by design, in mAh. Use BatteryTest's "size" to get the actual size of the battery. """ @property def capacity(self) -> float: """The quantity of """ from ereuse_devicehub.resources.action.models import MeasureBattery real_size = self.last_action_of(MeasureBattery).size return real_size / self.size if real_size and self.size else None class Camera(Component): """The camera of a device.""" focal_length = db.Column(db.SmallInteger) video_height = db.Column(db.SmallInteger) video_width = db.Column(db.Integer) horizontal_view_angle = db.Column(db.Integer) facing = db.Column(db.Enum(CameraFacing)) vertical_view_angle = db.Column(db.SmallInteger) video_stabilization = db.Column(db.Boolean) flash = db.Column(db.Boolean) class ComputerAccessory(Device): """Computer peripherals and similar accessories.""" id = Column(BigInteger, ForeignKey(Device.id), primary_key=True) pass class SAI(ComputerAccessory): pass class Keyboard(ComputerAccessory): layout = Column(DBEnum(Layouts)) # If we want to do it not null class Mouse(ComputerAccessory): pass class MemoryCardReader(ComputerAccessory): pass class Networking(NetworkMixin, Device): """Routers, switches, hubs...""" id = Column(BigInteger, ForeignKey(Device.id), primary_key=True) class Router(Networking): pass class Switch(Networking): pass class Hub(Networking): pass class WirelessAccessPoint(Networking): pass class Printer(Device): id = Column(BigInteger, ForeignKey(Device.id), primary_key=True) wireless = Column(Boolean, nullable=False, default=False) wireless.comment = """Whether it is a wireless printer.""" scanning = Column(Boolean, nullable=False, default=False) scanning.comment = """Whether the printer has scanning capabilities.""" technology = Column(DBEnum(PrinterTechnology)) technology.comment = """Technology used to print.""" monochrome = Column(Boolean, nullable=False, default=True) monochrome.comment = """Whether the printer is only monochrome.""" class LabelPrinter(Printer): pass class Sound(Device): pass class Microphone(Sound): pass class Video(Device): """Devices related to video treatment.""" pass class VideoScaler(Video): pass class Videoconference(Video): pass class Cooking(Device): """Cooking devices.""" pass class Mixer(Cooking): pass class DIYAndGardening(Device): pass class Drill(DIYAndGardening): max_drill_bit_size = db.Column(db.SmallInteger) class PackOfScrewdrivers(Device): pass class Home(Device): pass class Dehumidifier(Home): size = db.Column(db.SmallInteger) size.comment = """The capacity in Liters.""" class Stairs(Home): max_allowed_weight = db.Column(db.Integer) class Recreation(Device): pass class Bike(Recreation): wheel_size = db.Column(db.SmallInteger) gears = db.Column(db.SmallInteger) class Racket(Recreation): pass class Manufacturer(db.Model): """The normalized information about a manufacturer. Ideally users should use the names from this list when submitting devices. """ name = db.Column(CIText(), primary_key=True) name.comment = """The normalized name of the manufacturer.""" url = db.Column(URL(), unique=True) url.comment = """An URL to a page describing the manufacturer.""" logo = db.Column(URL()) logo.comment = """An URL pointing to the logo of the manufacturer.""" __table_args__ = ( # from https://niallburkley.com/blog/index-columns-for-like-in-postgres/ db.Index('name_index', text('name gin_trgm_ops'), postgresql_using='gin'), {'schema': 'common'} ) @classmethod def add_all_to_session(cls, session: db.Session): """Adds all manufacturers to session.""" cursor = session.connection().connection.cursor() #: Dialect used to write the CSV with pathlib.Path(__file__).parent.joinpath('manufacturers.csv').open() as f: cursor.copy_expert( 'COPY common.manufacturer FROM STDIN (FORMAT csv)', f ) listener_reset_field_updated_in_actual_time(Device)