From de4c365615da80031d05ac0a6506355986cc689a Mon Sep 17 00:00:00 2001
From: Llewellyn D'souza <lledsouza2209@gmail.com>
Date: Wed, 22 Dec 2021 16:45:38 +0530
Subject: [PATCH 1/2] Added: Item association model

---
 src/models/ItemAssociation.js | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 src/models/ItemAssociation.js

diff --git a/src/models/ItemAssociation.js b/src/models/ItemAssociation.js
new file mode 100644
index 0000000..84ebc83
--- /dev/null
+++ b/src/models/ItemAssociation.js
@@ -0,0 +1,25 @@
+const mongoose = require("mongoose");
+
+const schema = new mongoose.Schema(
+  {
+    item_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Item",
+    },
+    sub_level_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Sublevel",
+    },
+    quantity: {
+      type: Number,
+      default: 0,
+    },
+  },
+  {
+    timestamps: true,
+  }
+);
+
+const ItemAssociation = mongoose.model("ItemAssociation", schema);
+
+module.exports = ItemAssociation;

From c7c2823234eb4b85a4e35f8868d12f4d82614a7c Mon Sep 17 00:00:00 2001
From: Llewellyn D'souza <lledsouza2209@gmail.com>
Date: Wed, 22 Dec 2021 17:26:56 +0530
Subject: [PATCH 2/2] Added unique indexing

---
 src/models/ItemAssociation.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/models/ItemAssociation.js b/src/models/ItemAssociation.js
index 84ebc83..e84cc94 100644
--- a/src/models/ItemAssociation.js
+++ b/src/models/ItemAssociation.js
@@ -20,6 +20,8 @@ const schema = new mongoose.Schema(
   }
 );
 
+schema.index({ item_id: 1, sub_level_id: 1 }, { unique: 1 });
+
 const ItemAssociation = mongoose.model("ItemAssociation", schema);
 
 module.exports = ItemAssociation;