chore(utils): Improve big number decorator (#6525)

**What**
- Re add the ability to use the original column name as part of a select in both select in and joined strategy
- The undefined error message will now display the original column name instead of the underscored one

.changeset/honest-poets-sniff.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/utils": patch
+---
+
+chore(utils): Improve big number decorator

packages/utils/src/dal/mikro-orm/__tests__/big-number-field.spec.ts

@@ -1,21 +1,40 @@
 import { BigNumberRawValue } from "@medusajs/types"
 import { BigNumber } from "../../../totals/big-number"
 import { MikroOrmBigNumberProperty } from "../big-number-field"
+import { Entity, MikroORM, PrimaryKey } from "@mikro-orm/core"
+
+@Entity()
+class TestAmount {
+  @PrimaryKey()
+  id: string
+
+  @MikroOrmBigNumberProperty()
+  amount: BigNumber | number
+
+  raw_amount: BigNumberRawValue
+
+  @MikroOrmBigNumberProperty({ nullable: true })
+  nullable_amount: BigNumber | number | null = null
+
+  raw_nullable_amount: BigNumberRawValue | null = null
+}
 
 describe("@MikroOrmBigNumberProperty", () => {
+  let orm!: MikroORM
+
+  beforeEach(async () => {
+    orm = await MikroORM.init({
+      entities: [TestAmount],
+      dbName: "test",
+      type: "postgresql",
+    })
+  })
+
+  afterEach(async () => {
+    await orm.close()
+  })
+
   it("should correctly assign and update BigNumber values", () => {
-    class TestAmount {
-      @MikroOrmBigNumberProperty()
-      amount: BigNumber | number
-
-      raw_amount: BigNumberRawValue
-
-      @MikroOrmBigNumberProperty({ nullable: true })
-      nullable_amount: BigNumber | number | null = null
-
-      raw_nullable_amount: BigNumberRawValue | null = null
-    }
-
     const testAmount = new TestAmount()
 
     expect(testAmount.amount).toBeUndefined()
@@ -24,7 +43,6 @@ describe("@MikroOrmBigNumberProperty", () => {
     testAmount.amount = 100
 
     expect(testAmount.amount).toEqual(100)
-    expect((testAmount as any).amount_).toEqual(100)
     expect(testAmount.raw_amount).toEqual({
       value: "100",
       precision: 20,
@@ -45,7 +63,6 @@ describe("@MikroOrmBigNumberProperty", () => {
     testAmount.amount = 200
 
     expect(testAmount.amount).toEqual(200)
-    expect((testAmount as any).amount_).toEqual(200)
     expect(testAmount.raw_amount).toEqual({
       value: "200",
       precision: 20,
@@ -56,7 +73,6 @@ describe("@MikroOrmBigNumberProperty", () => {
     testAmount.amount = new BigNumber(300, { precision: 5 })
 
     expect(testAmount.amount).toEqual(300)
-    expect((testAmount as any).amount_).toEqual(300)
     expect(testAmount.raw_amount).toEqual({ value: "300", precision: 5 })
   })
 })

packages/utils/src/dal/mikro-orm/big-number-field.ts

@@ -9,16 +9,15 @@ export function MikroOrmBigNumberProperty(
   } = {}
 ) {
   return function (target: any, columnName: string) {
-    const targetColumn = columnName + "_"
     const rawColumnName = options.rawColumnName ?? `raw_${columnName}`
 
     Object.defineProperty(target, columnName, {
       get() {
-        return this[targetColumn]
+        return this.__helper.__data[columnName]
       },
       set(value: BigNumberInput) {
         if (options?.nullable && !isPresent(value)) {
-          this[targetColumn] = null
+          this.__helper.__data[columnName] = null
           this[rawColumnName] = null
 
           return
@@ -42,30 +41,22 @@ export function MikroOrmBigNumberProperty(
           bigNumber = new BigNumber(value)
         }
 
-        this[targetColumn] = bigNumber.numeric
+        this.__helper.__data[columnName] = bigNumber.numeric
 
         const raw = bigNumber.raw!
         raw.value = trimZeros(raw.value as string)
 
         this[rawColumnName] = raw
+
+        this.__helper.__touched = !this.__helper.hydrator.isRunning()
       },
     })
 
     Property({
       type: "number",
       columnType: "numeric",
-      fieldName: columnName,
-      serializer: () => {
-        return undefined
-      },
+      trackChanges: false,
       ...options,
-    })(target, targetColumn)
-
-    Property({
-      type: "number",
-      persist: false,
-      getter: true,
-      setter: true,
     })(target, columnName)
   }
 }