add author subscription

orm/user.py

@@ -33,6 +33,14 @@ class UserRole(Base):
 	user_id = Column(ForeignKey('user.id'), primary_key = True)
 	role_id = Column(ForeignKey('role.id'), primary_key = True)
 
+class AuthorSubscription(Base):
+	__tablename__ = "author_subscription"
+	
+	id = None
+	subscriber = Column(ForeignKey('user.slug'), primary_key = True)
+	author = Column(ForeignKey('user.slug'), primary_key = True)
+	createdAt = Column(DateTime, nullable=False, default = datetime.now, comment="Created at")
+
 class User(Base):
 	__tablename__ = "user"
 

resolvers/profile.py

@@ -1,9 +1,10 @@
 from orm import User, UserRole, Role, UserRating
+from orm.user import AuthorSubscription
 from orm.base import local_session
 from resolvers.base import mutation, query, subscription
 from auth.authenticate import login_required
 
-from sqlalchemy import func
+from sqlalchemy import func, and_
 from sqlalchemy.orm import selectinload
 import asyncio
 
@@ -46,3 +47,31 @@ async def update_profile(_, info, profile):
 		session.commit()
 
 	return {}
+
+@mutation.field("authorSubscribe")
+@login_required
+async def author_subscribe(_, info, slug):
+	user = info.context["request"].user
+
+	AuthorSubscription.create(
+		subscriber = user.slug, 
+		author = slug
+	)
+
+	return {}
+
+@mutation.field("authorUnsubscribe")
+@login_required
+async def author_unsubscribe(_, info, slug):
+	user = info.context["request"].user
+
+	with local_session() as session:
+		sub = session.query(AuthorSubscription).\
+			filter(and_(AuthorSubscription.subscriber == user.slug, AuthorSubscription.author == slug)).\
+			first()
+		if not sub:
+			return { "error" : "subscription not exist" }
+		session.delete(sub)
+		session.commit()
+
+	return {}

schema.graphql

@@ -150,6 +150,9 @@ type Mutation {
 	createCommunity(title: String!, desc: String!): Community!
 	updateCommunity(community: CommunityInput!): Community!
 	deleteCommunity(id: Int!): Result!
+
+	authorSubscribe(slug: String!): Result!
+	authorUnsubscribe(slug: String!): Result!
 }
 
 ################################### Query