add server to monorepo.

packages/server/src/models/ItemCategory.ts

@@ -0,0 +1,62 @@
+import { Model, mixin } from 'objection';
+import TenantModel from 'models/TenantModel';
+import ModelSetting from './ModelSetting';
+import ItemCategorySettings from './ItemCategory.Settings';
+
+export default class ItemCategory extends mixin(TenantModel, [ModelSetting]) {
+  /**
+   * Table name.
+   */
+  static get tableName() {
+    return 'items_categories';
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return ['createdAt', 'updatedAt'];
+  }
+
+  /**
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    const Item = require('models/Item');
+
+    return {
+      /**
+       * Item category may has many items.
+       */
+      items: {
+        relation: Model.HasManyRelation,
+        modelClass: Item.default,
+        join: {
+          from: 'items_categories.id',
+          to: 'items.categoryId',
+        },
+      },
+    };
+  }
+
+  /**
+   * Model modifiers.
+   */
+  static get modifiers() {
+    return {
+      /**
+       * Inactive/Active mode.
+       */
+      sortByCount(query, order = 'asc') {
+        query.orderBy('count', order);
+      },
+    };
+  }
+
+  /**
+   * Model meta.
+   */
+  static get meta() {
+    return ItemCategorySettings;
+  }
+}