WIP: Allocate landed cost.

server/src/models/ExpenseCategory.js

@@ -9,6 +9,21 @@ export default class ExpenseCategory extends TenantModel {
     return 'expense_transaction_categories';
   }
 
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return ['unallocatedLandedCost'];
+  }
+
+  /**
+   * Remain unallocated landed cost.
+   * @return {number}
+   */
+  get unallocatedLandedCost() {
+    return Math.max(this.amount - this.allocatedCostAmount, 0);
+  }
+
   /**
    * Relationship mapping.
    */