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85 lines
2 KiB
JavaScript
85 lines
2 KiB
JavaScript
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const { DataTypes, Model } = require('sequelize')
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class UserSeriesFollow extends Model {
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constructor(values, options) {
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super(values, options)
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/** @type {UUIDV4} */
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this.id
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/** @type {UUIDV4} */
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this.userId
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/** @type {UUIDV4} */
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this.seriesId
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/** @type {Date} */
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this.createdAt
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}
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/**
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* Get array of series IDs that a user is following
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* @param {string} userId
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* @returns {Promise<string[]>}
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*/
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static async getFollowedSeriesIdsForUser(userId) {
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const follows = await this.findAll({
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where: { userId },
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attributes: ['seriesId']
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})
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return follows.map((f) => f.seriesId)
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}
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/**
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* Initialize model
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* @param {import('../Database').sequelize} sequelize
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*/
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static init(sequelize) {
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super.init(
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{
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id: {
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type: DataTypes.UUID,
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defaultValue: DataTypes.UUIDV4,
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primaryKey: true
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}
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},
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{
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sequelize,
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modelName: 'userSeriesFollow',
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timestamps: true,
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updatedAt: false,
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indexes: [
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{
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name: 'user_series_follows_userId',
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fields: ['userId']
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},
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{
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name: 'user_series_follows_unique',
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fields: ['userId', 'seriesId'],
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unique: true
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},
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{
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name: 'user_series_follows_seriesId',
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fields: ['seriesId']
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}
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]
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}
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)
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// Super Many-to-Many
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// ref: https://sequelize.org/docs/v6/advanced-association-concepts/advanced-many-to-many/#the-best-of-both-worlds-the-super-many-to-many-relationship
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const { user, series } = sequelize.models
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user.belongsToMany(series, { through: UserSeriesFollow, as: 'followedSeries' })
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series.belongsToMany(user, { through: UserSeriesFollow, as: 'followers' })
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user.hasMany(UserSeriesFollow, {
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onDelete: 'CASCADE'
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})
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UserSeriesFollow.belongsTo(user)
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series.hasMany(UserSeriesFollow, {
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onDelete: 'CASCADE'
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})
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UserSeriesFollow.belongsTo(series)
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}
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}
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module.exports = UserSeriesFollow
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