add PackageKeyword SQLAlchemy ORM model

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

aurweb/models/package_keyword.py

+from sqlalchemy.orm import mapper
+
+from aurweb.db import make_relationship
+from aurweb.models.package_base import PackageBase
+from aurweb.schema import PackageKeywords
+
+
+class PackageKeyword:
+    def __init__(self,
+                 PackageBase: PackageBase = None,
+                 Keyword: str = None):
+        self.PackageBase = PackageBase
+        self.Keyword = Keyword
+
+
+mapper(PackageKeyword, PackageKeywords, properties={
+    "PackageBase": make_relationship(PackageBase,
+                                     PackageKeywords.c.PackageBaseID,
+                                     "keywords")
+})

test/test_package_keyword.py

+import pytest
+
+from sqlalchemy.exc import IntegrityError
+
+from aurweb.db import create, query
+from aurweb.models.account_type import AccountType
+from aurweb.models.package_base import PackageBase
+from aurweb.models.package_keyword import PackageKeyword
+from aurweb.testing import setup_test_db
+from aurweb.testing.models import make_user
+
+user, pkgbase = None, None
+
+
+@pytest.fixture(autouse=True)
+def setup():
+    global user, pkgbase
+
+    setup_test_db("Users", "PackageBases", "PackageKeywords")
+
+    account_type = query(AccountType,
+                         AccountType.AccountType == "User").first()
+    user = make_user(Username="test", Email="test@example.org",
+                     RealName="Test User", Passwd="testPassword",
+                     AccountType=account_type)
+    pkgbase = create(PackageBase,
+                     Name="beautiful-package",
+                     Maintainer=user)
+
+    yield pkgbase
+
+    from aurweb.db import session
+    session.delete(pkgbase)
+    session.commit()
+
+
+def test_package_keyword():
+    from aurweb.db import session
+    pkg_keyword = create(PackageKeyword,
+                         PackageBase=pkgbase,
+                         Keyword="test")
+    assert pkg_keyword in pkgbase.keywords
+    assert pkgbase == pkg_keyword.PackageBase
+    session.delete(pkg_keyword)
+    session.commit()
+
+
+def test_package_keyword_null_pkgbase_raises_exception():
+    from aurweb.db import session
+
+    with pytest.raises(IntegrityError):
+        create(PackageKeyword,
+               Keyword="test")
+    session.rollback()