add PackageComaintainer SQLAlchemy ORM model

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/models/package_comaintainer.py

@@ -0,0 +1,53 @@
+from sqlalchemy import Column, ForeignKey, Integer
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.orm import backref, relationship
+
+import aurweb.models.package_base
+import aurweb.models.user
+
+from aurweb.models.declarative import Base
+
+
+class PackageComaintainer(Base):
+    __tablename__ = "PackageComaintainers"
+
+    UsersID = Column(
+        Integer, ForeignKey("Users.ID", ondelete="CASCADE"),
+        nullable=False)
+    User = relationship(
+        "User", backref=backref("comaintained", lazy="dynamic"),
+        foreign_keys=[UsersID])
+
+    PackageBaseID = Column(
+        Integer, ForeignKey("PackageBases.ID", ondelete="CASCADE"),
+        nullable=False)
+    PackageBase = relationship(
+        "PackageBase", backref=backref("comaintainers", lazy="dynamic"),
+        foreign_keys=[PackageBaseID])
+
+    __mapper_args__ = {"primary_key": [UsersID, PackageBaseID]}
+
+    def __init__(self,
+                 User: aurweb.models.user.User = None,
+                 PackageBase: aurweb.models.package_base.PackageBase = None,
+                 Priority: int = None):
+        self.User = User
+        if not self.User:
+            raise IntegrityError(
+                statement="Foreign key UsersID cannot be null.",
+                orig="PackageComaintainers.UsersID",
+                params=("NULL"))
+
+        self.PackageBase = PackageBase
+        if not self.PackageBase:
+            raise IntegrityError(
+                statement="Foreign key PackageBaseID cannot be null.",
+                orig="PackageComaintainers.PackageBaseID",
+                params=("NULL"))
+
+        self.Priority = Priority
+        if not self.Priority:
+            raise IntegrityError(
+                statement="Column Priority cannot be null.",
+                orig="PackageComaintainers.Priority",
+                params=("NULL"))