fix(pricing): fix pricing query when max_quantity is null (medusajs#12981)

what: 

Prices when max_quantity value is null is accounted for when quantity is passed in context.

Co-authored-by: Oli Juhl <[email protected]>

Author: riqwan

.changeset/dry-bikes-burn.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/pricing": patch
+---
+
+fix(pricing): fix pricing query when max_quantity is null

packages/modules/pricing/integration-tests/__tests__/services/pricing-module/calculate-price.spec.ts

@@ -76,6 +76,16 @@ moduleIntegrationTestRunner<IPricingModuleService>({
               max_quantity: 10,
               rules_count: 0,
             },
+            {
+              id: "price-PLN-min-quantity-only",
+              title: "price PLN - min quantity only",
+              price_set_id: "price-set-PLN",
+              currency_code: "PLN",
+              amount: 1250,
+              min_quantity: 20,
+              max_quantity: null,
+              rules_count: 0,
+            },
             {
               id: "price-ETH",
               title: "price ETH",
@@ -451,6 +461,55 @@ moduleIntegrationTestRunner<IPricingModuleService>({
           ])
         })
 
+        it("should successfully calculate prices where only min quantity is set", async () => {
+          const context = {
+            currency_code: "PLN",
+            region_id: "PL",
+            quantity: 255,
+          }
+
+          const calculatedPrice = await service.calculatePrices(
+            { id: ["price-set-EUR", "price-set-PLN"] },
+            { context }
+          )
+
+
+          expect(calculatedPrice).toEqual([
+            {
+              id: "price-set-PLN",
+              is_calculated_price_price_list: false,
+              is_calculated_price_tax_inclusive: false,
+              calculated_amount: 1250,
+              raw_calculated_amount: {
+                value: "1250",
+                precision: 20,
+              },
+              is_original_price_price_list: false,
+              is_original_price_tax_inclusive: false,
+              original_amount: 1250,
+              raw_original_amount: {
+                value: "1250",
+                precision: 20,
+              },
+              currency_code: "PLN",
+              calculated_price: {
+                id: "price-PLN-min-quantity-only",
+                price_list_id: null,
+                price_list_type: null,
+                min_quantity: 20,
+                max_quantity: null,
+              },
+              original_price: {
+                id: "price-PLN-min-quantity-only",
+                price_list_id: null,
+                price_list_type: null,
+                min_quantity: 20,
+                max_quantity: null,
+              },
+            },
+          ])
+        })
+
         it("should throw an error when currency code is not set", async () => {
           let result = service.calculatePrices(
             { id: ["price-set-EUR", "price-set-PLN"] },

packages/modules/pricing/src/repositories/pricing.ts

@@ -126,14 +126,24 @@ export class PricingRepository
 
     if (quantity !== undefined) {
       query.andWhere(function (this: Knex.QueryBuilder) {
-        this.where(function (this: Knex.QueryBuilder) {
+        this.orWhere(function (this: Knex.QueryBuilder) {
           this.where("price.min_quantity", "<=", quantity).andWhere(
             "price.max_quantity",
             ">=",
             quantity
           )
-        }).orWhere(function (this: Knex.QueryBuilder) {
-          this.whereNull("price.min_quantity").whereNull("price.max_quantity")
+
+          this.orWhere("price.min_quantity", "<=", quantity).whereNull(
+            "price.max_quantity"
+          )
+
+          this.orWhereNull("price.min_quantity").whereNull("price.max_quantity")
+
+          this.orWhereNull("price.min_quantity").andWhere(
+            "price.max_quantity",
+            ">=",
+            quantity
+          )
         })
       })
     } else {