const mongoose = require("mongoose"); const CheckSchema = mongoose.Schema( { monitorId: { type: mongoose.Schema.Types.ObjectId, ref: "Monitor", immutable: true, }, status: { type: Boolean, }, responseTime: { type: Number, // milliseconds }, statusCode: { type: Number, // 200, ... , 500 }, message: { type: String, }, expiry: { type: Date, default: Date.now, expires: 60 * 60 * 24 * 30, // 30 days in seconds }, }, { timestamps: true, } ); CheckSchema.pre("save", async function (next) { const monitor = await mongoose.model("Monitor").findById(this.monitorId); if (monitor.status === true && this.status === false) { console.log("Monitor went down"); } if (monitor.status === false && this.status === true) { console.log("Monitor went up"); } monitor.status = this.status; await monitor.save(); next; }); module.exports = mongoose.model("Check", CheckSchema);