fix: event association in article

article can have many events

also add seed for categories (with scuffed association example)

backend/src/events/models.py

@@ -21,7 +21,7 @@ class Article(Base):
     source: Mapped[ArticleSource]
     date: Mapped[datetime]
 
-    event: Mapped["Event"] = relationship(back_populates="original_article")
+    events: Mapped[list["Event"]] = relationship(back_populates="original_article")
 
 
 class Event(Base):
@@ -40,7 +40,7 @@ class Event(Base):
         back_populates="events", secondary="event_category"
     )
 
-    original_article: Mapped[Article] = relationship(back_populates="event")
+    original_article: Mapped[Article] = relationship(back_populates="events")
 
 
 class Category(Base):

backend/src/scripts/seed.py

@@ -0,0 +1,84 @@
+from datetime import datetime
+from sqlalchemy import select
+from src.events.models import Article, ArticleSource, Category, Event
+from sqlalchemy.orm import Session
+from src.common.database import engine
+
+
+def add_categories():
+    CATEGORIES = [
+        "Arts & Humanities",
+        "Science & Tech",
+        "Politics",
+        "Media",
+        "Environment",
+        "Education",
+        "Sports",
+        "Gender & Equality",
+        "Religion",
+        "Society & Culture",
+        "Economics",
+    ]
+    categories = [Category(name=category_name) for category_name in CATEGORIES]
+    with Session(engine) as session:
+        # If categories are already added, return
+        if session.scalars(select(Category)).first() is not None:
+            return
+        session.add_all(categories)
+        session.commit()
+
+
+add_categories()
+
+
+def test_associations():
+    with Session(engine) as session:
+        article = Article(
+            title="test article",
+            summary="test summary",
+            url="https://whatever.com",
+            source=ArticleSource.CNA,
+            body="test body",
+            date="2024-02-05",
+        )
+        event = Event(
+            title="test event 1",
+            description="x",
+            analysis="x",
+            duplicate=False,
+            date=datetime.now(),
+            is_singapore=False,
+        )
+        article.events.append(event)
+        session.add(article)
+        session.commit()
+
+        session.refresh(article)
+        session.refresh(event)
+        print(article)
+        print(event)
+        event_id = event.id
+
+    with Session(engine) as session:
+        event_again = session.scalar(select(Event).where(Event.id == event_id))
+        categories = session.scalars(
+            select(Category).where(Category.name.in_(["Environment", "Media"]))
+        )
+        event_again.categories.extend(categories)
+        session.add(event_again)
+        session.commit()
+
+    with Session(engine) as session:
+        event_again = session.scalar(select(Event).where(Event.id == event_id))
+        print(event_again)
+        print(event_again.original_article)
+        print(event_again.categories)
+        event_again.categories.clear()
+        original_article = event_again.original_article
+        session.add(event_again)
+        session.commit()
+        session.delete(event_again)
+        session.delete(original_article)
+
+
+# test_associations()