full

models/UserFollowModel.js

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+const mongoose = require('mongoose')
+const timestamp = require('mongoose-timestamp')
+
+const userFollowSchema = new mongoose.Schema({
+  followerId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'User',
+    required: true,
+    index: true,
+  },
+  followingId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'User',
+    required: true,
+    index: true,
+  },
+})
+
+userFollowSchema.index({ followerId: 1, followingId: 1 }, { unique: true })
+
+userFollowSchema.plugin(timestamp)
+const UserFollowModel = mongoose.model('UserFollow', userFollowSchema)
+
+module.exports = UserFollowModel