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RBAC Models — Role-Based Access Control with hierarchical roles and granular permissions.
"""
import uuid
from typing import Optional
from sqlalchemy import String, Integer, Boolean, Index, ForeignKey, UniqueConstraint
from sqlalchemy.dialects.postgresql import UUID, JSONB
from sqlalchemy.orm import Mapped, mapped_column, relationship
from app.models.base import Base, TimestampMixin, UUIDPrimaryKeyMixin
class Role(UUIDPrimaryKeyMixin, TimestampMixin, Base):
"""
Named roles in the system.
Seeded with: super_admin, admin, manager, ml_engineer, data_scientist, viewer.
"""
__tablename__ = "roles"
__table_args__ = (
Index("ix_roles_name", "name", unique=True),
)
name: Mapped[str] = mapped_column(String(50), unique=True, nullable=False)
display_name: Mapped[str] = mapped_column(String(100), nullable=False)
description: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
hierarchy_level: Mapped[int] = mapped_column(
Integer, nullable=False, default=10
)
is_system: Mapped[bool] = mapped_column(
Boolean, default=False, nullable=False
)
# Relationships
permissions: Mapped[list["RolePermission"]] = relationship(
back_populates="role", lazy="selectin"
)
users: Mapped[list["UserRole"]] = relationship(
back_populates="role", lazy="noload"
)
def __repr__(self) -> str:
return f"<Role name={self.name} level={self.hierarchy_level}>"
class Permission(UUIDPrimaryKeyMixin, TimestampMixin, Base):
"""
Granular permissions (e.g., 'users:read', 'models:deploy').
"""
__tablename__ = "permissions"
__table_args__ = (
Index("ix_permissions_codename", "codename", unique=True),
)
codename: Mapped[str] = mapped_column(String(100), unique=True, nullable=False)
display_name: Mapped[str] = mapped_column(String(200), nullable=False)
description: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
resource: Mapped[str] = mapped_column(String(50), nullable=False)
action: Mapped[str] = mapped_column(String(50), nullable=False)
# Relationships
roles: Mapped[list["RolePermission"]] = relationship(
back_populates="permission", lazy="noload"
)
def __repr__(self) -> str:
return f"<Permission codename={self.codename}>"
class RolePermission(UUIDPrimaryKeyMixin, Base):
"""Join table: which permissions belong to which roles."""
__tablename__ = "role_permissions"
__table_args__ = (
UniqueConstraint("role_id", "permission_id", name="uq_role_permission"),
)
role_id: Mapped[uuid.UUID] = mapped_column(
UUID(as_uuid=True),
ForeignKey("roles.id", ondelete="CASCADE"),
nullable=False,
)
permission_id: Mapped[uuid.UUID] = mapped_column(
UUID(as_uuid=True),
ForeignKey("permissions.id", ondelete="CASCADE"),
nullable=False,
)
# Relationships
role: Mapped["Role"] = relationship(back_populates="permissions")
permission: Mapped["Permission"] = relationship(back_populates="roles")
class UserRole(UUIDPrimaryKeyMixin, TimestampMixin, Base):
"""
Join table: which roles are assigned to which users.
A user can have multiple roles.
"""
__tablename__ = "user_roles"
__table_args__ = (
UniqueConstraint("user_id", "role_id", name="uq_user_role"),
Index("ix_user_roles_user_id", "user_id"),
)
user_id: Mapped[uuid.UUID] = mapped_column(
UUID(as_uuid=True),
ForeignKey("users.id", ondelete="CASCADE"),
nullable=False,
)
role_id: Mapped[uuid.UUID] = mapped_column(
UUID(as_uuid=True),
ForeignKey("roles.id", ondelete="CASCADE"),
nullable=False,
)
granted_by: Mapped[Optional[uuid.UUID]] = mapped_column(
UUID(as_uuid=True), nullable=True
)
is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
# Relationships
user: Mapped["User"] = relationship(back_populates="roles")
role: Mapped["Role"] = relationship(back_populates="users")
def __repr__(self) -> str:
return f"<UserRole user_id={self.user_id} role_id={self.role_id}>"
# Forward reference
from app.models.user import User # noqa: E402
|