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47 lines
1.4 KiB
47 lines
1.4 KiB
"""Contains the GroupSubscription class."""
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from datetime import datetime
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from sqlalchemy import Column, ForeignKey, Integer, TIMESTAMP
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from sqlalchemy.orm import relationship
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from sqlalchemy.sql.expression import text
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from tildes.metrics import incr_counter
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from tildes.models import DatabaseModel
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from tildes.models.user import User
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from .group import Group
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class GroupSubscription(DatabaseModel):
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"""Model for a user's subscription to a group.
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Trigger behavior:
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Outgoing:
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- Inserting or deleting a row will increment or decrement the num_subscriptions
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column for the relevant group.
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"""
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__tablename__ = "group_subscriptions"
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user_id: int = Column(
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Integer, ForeignKey("users.user_id"), nullable=False, primary_key=True
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)
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group_id: int = Column(
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Integer, ForeignKey("groups.group_id"), nullable=False, primary_key=True
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)
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created_time: datetime = Column(
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TIMESTAMP(timezone=True),
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nullable=False,
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index=True,
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server_default=text("NOW()"),
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)
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user: User = relationship("User", innerjoin=True, backref="subscriptions")
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group: Group = relationship("Group", innerjoin=True, lazy=False)
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def __init__(self, user: User, group: Group) -> None:
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"""Create a new subscription to a group."""
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self.user = user
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self.group = group
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incr_counter("subscriptions")
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