Update uniqueness checks to use sqlalchemy orm 2.0 style

amanuensis/backend/lexicon.py

@@ -38,7 +38,10 @@ def create(
         raise ArgumentError('Lexicon prompt must be a string')
 
     # Query the db to make sure the lexicon name isn't taken
-    if db.session.query(func.count(Lexicon.id)).filter(Lexicon.name == name).scalar() > 0:
+    if db(
+        select(func.count(Lexicon.id))
+        .where(Lexicon.name == name)
+    ).scalar() > 0:
         raise ArgumentError('Lexicon name is already taken')
 
     new_lexicon = Lexicon(

amanuensis/backend/membership.py

@@ -2,6 +2,8 @@
 Membership query interface
 """
 
+from sqlalchemy import select, func
+
 from amanuensis.db import DbContext, Membership
 from amanuensis.errors import ArgumentError
 
@@ -14,7 +16,7 @@ def create(
     """
     Create a new user membership in a lexicon.
     """
-    # Quick argument verification
+    # Verify argument types are correct
     if not isinstance(user_id, int):
         raise ArgumentError('user_id')
     if not isinstance(lexicon_id, int):
@@ -22,6 +24,14 @@ def create(
     if not isinstance(is_editor, bool):
         raise ArgumentError('is_editor')
 
+    # Verify user has not already joined lexicon
+    if db(
+        select(func.count(Membership.id))
+        .where(Membership.user_id == user_id)
+        .where(Membership.lexicon_id == lexicon_id)
+    ).scalar() > 0:
+        raise ArgumentError('User is already a member of lexicon')
+
     new_membership = Membership(
         user_id=user_id,
         lexicon_id=lexicon_id,

amanuensis/backend/user.py

@@ -51,7 +51,10 @@ def create(
         raise ArgumentError('Email must be a string')
 
     # Query the db to make sure the username isn't taken
-    if db.session.query(func.count(User.id)).filter(User.username == username).scalar() > 0:
+    if db(
+        select(func.count(User.id))
+        .where(User.username == username)
+    ).scalar() > 0:
         raise ArgumentError('Username is already taken')
 
     new_user = User(

amanuensis/db/__init__.py

@@ -13,3 +13,19 @@ from .models import (
     ArticleContentRule,
     Post,
 )
+
+__all__ = [
+    'DbContext',
+    'User',
+    'Lexicon',
+    'Membership',
+    'Character',
+    'ArticleState',
+    'Article',
+    'IndexType',
+    'ArticleIndex',
+    'ArticleIndexRule',
+    'ArticleContentRuleType',
+    'ArticleContentRule',
+    'Post',
+]

amanuensis/db/database.py

@@ -33,5 +33,10 @@ class DbContext():
         # Create a thread-safe session factory
         self.session = scoped_session(sessionmaker(bind=self.engine))
 
+    def __call__(self, *args, **kwargs):
+        """Provides shortcut access to session.execute."""
+        return self.session.execute(*args, **kwargs)
+
     def create_all(self):
+        """Initializes the database schema."""
         ModelBase.metadata.create_all(self.engine)

amanuensis/db/models.py

@@ -2,6 +2,8 @@
 Data model SQL definitions
 """
 import enum
+import uuid
+
 from sqlalchemy import (
     Boolean,
     Column,
@@ -17,7 +19,7 @@ from sqlalchemy import (
     TypeDecorator,
 )
 from sqlalchemy.orm import relationship, backref
-import uuid
+from sqlalchemy.sql.schema import UniqueConstraint
 
 from .database import ModelBase
 
@@ -233,6 +235,9 @@ class Membership(ModelBase):
     Represents a user's participation in a Lexicon game.
     """
     __tablename__ = 'membership'
+    __table_args__ = (
+        UniqueConstraint('user_id', 'lexicon_id'),
+    )
 
     ###################
     # Membership keys #

tests/conftest.py

@@ -0,0 +1,73 @@
+"""
+pytest test fixtures
+"""
+import pytest
+
+from amanuensis.db import DbContext
+import amanuensis.backend.lexicon as lexiq
+import amanuensis.backend.membership as memq
+import amanuensis.backend.user as userq
+
+
+@pytest.fixture
+def db():
+    """Provides an initialized database in memory."""
+    db = DbContext('sqlite:///:memory:', debug=True)
+    db.create_all()
+    return db
+
+
+@pytest.fixture
+def make_user(db: DbContext):
+    """Provides a factory function for creating users, with valid default values."""
+    def user_factory(state={'nonce': 1}, **kwargs):
+        default_kwargs = {
+            'username': f'test_user_{state["nonce"]}',
+            'password': 'password',
+            'display_name': None,
+            'email': 'user@example.com',
+            'is_site_admin': False,
+        }
+        state['nonce'] += 1
+        updated_kwargs = {**default_kwargs, **kwargs}
+        return userq.create(db, **updated_kwargs)
+    return user_factory
+
+
+@pytest.fixture
+def make_lexicon(db: DbContext):
+    """Provides a factory function for creating lexicons, with valid default values."""
+    def lexicon_factory(state={'nonce': 1}, **kwargs):
+        default_kwargs = {
+            'name': f'Test_{state["nonce"]}',
+            'title': None,
+            'prompt': f'Test Lexicon game {state["nonce"]}'
+        }
+        state['nonce'] += 1
+        updated_kwargs = {**default_kwargs, **kwargs}
+        return lexiq.create(db, **updated_kwargs)
+    return lexicon_factory
+
+
+@pytest.fixture
+def make_membership(db: DbContext):
+    """Provides a factory function for creating memberships, with valid default values."""
+    def membership_factory(**kwargs):
+        default_kwargs = {
+            'is_editor': False,
+        }
+        updated_kwargs = {**default_kwargs, **kwargs}
+        return memq.create(db, **updated_kwargs)
+    return membership_factory
+
+
+@pytest.fixture
+def lexicon_with_editor(make_user, make_lexicon, make_membership):
+    """Shortcut setup for a lexicon game with an editor."""
+    editor = make_user()
+    assert editor
+    lexicon = make_lexicon()
+    assert lexicon
+    membership = make_membership(user_id=editor.id, lexicon_id=lexicon.id, is_editor=True)
+    assert membership
+    return (lexicon, editor)

tests/test_db.py

@@ -1,17 +1,9 @@
-import pytest
 from sqlalchemy import func
 
 from amanuensis.db import *
 
 
-@pytest.fixture
-def db():
-    db = DbContext('sqlite:///:memory:', debug=True)
-    db.create_all()
-    return db
-
-
-def test_create(db):
+def test_create_db(db: DbContext):
     """Simple test that the database creates fine from scratch."""
     assert db.session.query(func.count(User.id)).scalar() == 0
     assert db.session.query(func.count(Lexicon.id)).scalar() == 0

tests/test_lexicon.py

@@ -2,14 +2,12 @@ import datetime
 
 import pytest
 
-from amanuensis.db import *
+from amanuensis.db import DbContext
 import amanuensis.backend.lexicon as lexiq
 from amanuensis.errors import ArgumentError
 
-from .test_db import db
 
-
-def test_create_lexicon(db):
+def test_create_lexicon(db: DbContext):
     """Test new game creation."""
     kwargs = {
         'name': 'Test',
@@ -43,3 +41,4 @@ def test_create_lexicon(db):
     # No duplicate lexicon names
     with pytest.raises(ArgumentError):
         duplicate = lexiq.create(db, **kwargs)
+        assert duplicate

tests/test_membership.py

@@ -1,17 +1,18 @@
+import pytest
+
+from sqlalchemy import select
+
 from amanuensis.db import *
-import amanuensis.backend.lexicon as lexiq
+from amanuensis.errors import ArgumentError
 import amanuensis.backend.membership as memq
-import amanuensis.backend.user as userq
-
-from .test_db import db
 
 
-def test_create(db: DbContext):
+def test_create_membership(db: DbContext, make_user, make_lexicon):
     """Test joining a game."""
     # Set up a user and a lexicon
-    new_user = userq.create(db, 'username', 'password', 'user', 'a@b.c', False)
+    new_user = make_user()
     assert new_user.id, 'Failed to create user'
-    new_lexicon = lexiq.create(db, 'Test', None, 'prompt')
+    new_lexicon = make_lexicon()
     assert new_lexicon.id, 'Failed to create lexicon'
 
     # Add the user to the lexicon as an editor
@@ -19,10 +20,22 @@ def test_create(db: DbContext):
     assert mem, 'Failed to create membership'
 
     # Check that the user and lexicon are mutually visible in the ORM relationships
-    assert new_user.memberships, 'User memberships not updated'
-    assert new_lexicon.memberships, 'Lexicon memberships not updated'
-    assert new_user.memberships[0].lexicon_id == new_lexicon.id
-    assert new_lexicon.memberships[0].user_id == new_user.id
+    assert any(map(lambda mem: mem.lexicon == new_lexicon, new_user.memberships))
+    assert any(map(lambda mem: mem.user == new_user, new_lexicon.memberships))
 
     # Check that the editor flag was set properly
-    assert new_lexicon.memberships
+    editor = db(
+        select(User)
+        .join(User.memberships)
+        .join(Membership.lexicon)
+        .where(Lexicon.id == new_lexicon.id)
+        .where(Membership.is_editor == True)
+    ).scalar_one()
+    assert editor is not None
+    assert isinstance(editor, User)
+    assert editor.id == new_user.id
+
+    # Check that joining twice is not allowed
+    with pytest.raises(ArgumentError):
+        mem2 = memq.create(db, new_user.id, new_lexicon.id, False)
+        assert mem2

tests/test_post.py

@@ -1,32 +1,19 @@
 import pytest
 
-from amanuensis.db import *
-import amanuensis.backend.lexicon as lexiq
-import amanuensis.backend.user as userq
+from amanuensis.db import DbContext
 import amanuensis.backend.post as postq
-import amanuensis.backend.membership as memq
 
 from amanuensis.errors import ArgumentError
 
-from .test_db import db
 
-def test_create_post(db):
+def test_create_post(db: DbContext, lexicon_with_editor):
     """Test new post creation"""
-
-    # Make user and lexicon
-    new_user = userq.create(db, 'username', 'password', 'user', 'a@b.c', False)
-    assert new_user.id, 'Failed to create user'
-    new_lexicon = lexiq.create(db, 'Test', None, 'prompt')
-    assert new_lexicon.id, 'Failed to create lexicon'
-
-    # Add the user to the lexicon as an editor
-    mem = memq.create(db, new_user.id, new_lexicon.id, True)
-    assert mem, 'Failed to create membership'
+    lexicon, editor = lexicon_with_editor
 
     # argument dictionary for post object
     kwargs = {
-        'lexicon_id': new_lexicon.id,
-        'user_id': new_user.id,
+        'lexicon_id': lexicon.id,
+        'user_id': editor.id,
         'body': 'body'
     }
 

tests/test_user.py

@@ -1,21 +1,11 @@
 import pytest
 
-from amanuensis.db import *
-import amanuensis.backend.lexicon as lexiq
+from amanuensis.db import DbContext
 import amanuensis.backend.user as userq
 from amanuensis.errors import ArgumentError
 
-from .test_db import db
 
-
-@pytest.fixture
-def db():
-    db = DbContext('sqlite:///:memory:', debug=True)
-    db.create_all()
-    return db
-
-
-def test_create_user(db):
+def test_create_user(db: DbContext):
     """Test new user creation."""
     kwargs = {
         'username': 'username',