22 lines
1.2 KiB
JavaScript
22 lines
1.2 KiB
JavaScript
module.exports = (sequelize) => {
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const { User, Group, FriendRequest, Friendship } = sequelize.models;
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// User <-> Group: Many-to-Many
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// A User can be in many Groups, and a Group can have many Users (members).
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const UserGroup = sequelize.define('UserGroup', {}, { timestamps: false });
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User.belongsToMany(Group, { through: UserGroup, foreignKey: 'userId' });
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Group.belongsToMany(User, { through: UserGroup, as: 'members', foreignKey: 'groupId' });
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// Friendship is a direct link between two users.
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// user1Id will always be less than user2Id to ensure uniqueness.
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Friendship.belongsTo(User, { as: 'user1', foreignKey: 'user1Id' });
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Friendship.belongsTo(User, { as: 'user2', foreignKey: 'user2Id' });
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// User <-> FriendRequest: One-to-Many
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// A User can send many friend requests and receive many friend requests.
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User.hasMany(FriendRequest, { as: 'sentRequests', foreignKey: 'fromUserId', onDelete: 'CASCADE' });
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User.hasMany(FriendRequest, { as: 'receivedRequests', foreignKey: 'toUserId', onDelete: 'CASCADE' });
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FriendRequest.belongsTo(User, { as: 'fromUser', foreignKey: 'fromUserId' });
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FriendRequest.belongsTo(User, { as: 'toUser', foreignKey: 'toUserId' });
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};
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