[Bug]: Price list `min_quantity` tiered price not applied to cart line item when an override base price exists

[jalagania]

Package.json file

{
	"license": "MIT",
	"keywords": [
		"sqlite",
		"postgres",
		"typescript",
		"ecommerce",
		"headless",
		"medusa"
	],
	"scripts": {
		"build": "medusa build",
		"seed": "medusa exec ./src/scripts/seed.ts",
		"start": "redis-server /opt/homebrew/etc/redis.conf --daemonize yes && medusa start",
		"dev": "redis-server /opt/homebrew/etc/redis.conf --daemonize yes && medusa develop; redis-cli shutdown"
	},
	"dependencies": {
		"@google-cloud/storage": "^7.15.1",
		"@imgproxy/imgproxy-node": "^1.1.0",
		"@medusajs/admin-sdk": "2.17.2",
		"@medusajs/cli": "2.17.2",
		"@medusajs/framework": "2.17.2",
		"@medusajs/index": "2.17.2",
		"@medusajs/medusa": "2.17.2",
		"@medusajs/translation": "2.17.2",
		"@narisolutions/medusa-plugin-pos": "^0.1.2",
		"@react-email/components": "0.0.33",
		"@reorderjs/reorder": "^1.0.8",
		"@sentry/cli": "^2.43.0",
		"@sentry/node": "^9.11.0",
		"@sentry/profiling-node": "^9.11.0",
		"@uiw/react-json-view": "^2.0.0-alpha.17",
		"add": "^2.0.6",
		"bwip-js": "^4.6.0",
		"cors": "^2.8.5",
		"cron-parser": "^5.5.0",
		"dayjs": "^1.11.18",
		"exceljs": "^4.4.0",
		"i18n-js": "^4.5.1",
		"juice": "11.1.1",
		"jwt-decode": "^4.0.0",
		"mime-types": "^2.1.35",
		"posthog-node": "^5.21.1",
		"qrcode": "^1.5.4",
		"react": "18.3.1",
		"react-dom": "18.3.1",
		"react-is": "^18.3.1",
		"tsconfig-paths": "^4.2.0",
		"yarn": "^1.22.22",
		"zod": "4.2.0",
		"zustand": "^5.0.5"
	},
	"devDependencies": {
		"@swc/core": "1.5.7",
		"@types/cors": "^2.8.17",
		"@types/mime-types": "^2.1.4",
		"@types/node": "^20.0.0",
		"@types/qrcode": "^1.5.5",
		"@types/react": "^18.3.2",
		"@types/react-dom": "^18.2.25",
		"prettier": "^3.6.2",
		"prop-types": "^15.8.1",
		"react-email": "3.0.7",
		"ts-node": "^10.9.2",
		"typescript": "^5.6.2",
		"vite": "^5.2.11"
	},
	"engines": {
		"node": ">=24"
	}
}

Node.js version

v24

Database and its version

PostgreSQL 17

Operating system name and version

macOS 26.3

Browser name

No response

What happended?

Price list min_quantity tiered price not applied to cart line item when an override base price exists

Summary

I have a price list of type override with a customer group rule. The base override price is applied to the cart line item correctly, but the conditional (quantity-based) price with min_quantity is never applied, even when the cart line item quantity is well above the minimum.

Is this supposed to work for price lists, or am I misconfiguring something? The pricing docs say tiered pricing is chosen from the cart's item quantity, but I can't get the min_quantity tier to apply inside a price list.

Environment

• Medusa version: v2.17.2+
• Reproduced via the standard store cart flow (create cart → add line item as an authenticated customer in the target group).

Price list configuration

{
  "id": "plist_01KX0MCHXVFXJMTXD4YW1AZRAV",
  "type": "override",
  "status": "active",
  "starts_at": null,
  "ends_at": null,
  "rules": {
    "customer.groups.id": ["cusgroup_01KWKP4NJK53B4WANH06ZD0EXN"]
  }
}

Price entries

For variant variant_01JV83C575WPDQV2B62RX7Q4A2, currency gel:

Price	min_quantity	Result in cart
2.00 GEL	null	Applied correctly ✅
1.50 GEL	5	Never applied ❌

Steps to reproduce

1. Create a price list of type override with rule customer.groups.id = [<group>], status active.
2. Add two prices for the same variant + currency:
   • 2.00 with no min_quantity
   • 1.50 with min_quantity: 5
3. As a customer belonging to that group, add the variant to a cart in the matching region/currency.
4. Set the line item quantity to 8 (≥ 5).
5. Inspect the cart line item's unit_price.

Cart context

• Cart item quantity: 8 (≥ 5)
• Customer belongs to group: cusgroup_01KWKP4NJK53B4WANH06ZD0EXN
• Currency: GEL
• Region: reg_01JV83BKV3MXZ0VW0P0DRB0HS5 (Georgia)

Expected behavior

When the cart line item quantity is ≥ 5, the resolved unit_price should be 1.50 GEL (the min_quantity: 5 tier).

Actual behavior

The line item unit_price stays at 2.00 GEL regardless of quantity. The min_quantity: 5 tier is never selected; only the price with no quantity condition is applied.

What I observed while debugging

The base override (no min_quantity) resolves fine, so the price list, group rule, region, and currency all match correctly — the customer-group context is clearly reaching the cart. The only thing that doesn't work is selecting the min_quantity tier from the cart's line item quantity.

The store/cart pricing context type (MedusaPricingContext in @medusajs/types) has no quantity field:

export type MedusaPricingContext = {
  region_id?: string;
  currency_code?: string;
  customer_id?: string;
  customer?: { groups?: { id: string }[] };
  // no `quantity`
};

whereas the low-level pricingModuleService.calculatePrices(filters, context) does accept a quantity in its context (per the docs example: context: { currency_code, min_quantity: 4 }). So from the outside it looks like the cart resolves price-list prices without ever passing the line item quantity, which would explain why only the no-quantity price can be selected.

This looks related to (possibly the same root cause as):

• [Bug]: Cart price_unit does not reflect to PriceSet's price rule #11819 — Cart price_unit does not reflect PriceSet's price rule (closed as "not planned")
• Price list is not working while changing item quantity in cart #5359 — Price list not working while changing item quantity in cart

Question

Is applying a min_quantity tier inside a price list to a cart line item supported in v2? If yes, what am I missing in the configuration? If it's a known limitation, is the recommended approach to use a promotion with a quantity condition instead?

Expected behavior

When the cart line item quantity is ≥ 5, the resolved unit_price should be 1.50 GEL (the min_quantity: 5 tier).

Actual behavior

The line item unit_price stays at 2.00 GEL regardless of quantity. The min_quantity: 5 tier is never selected; only the price with no quantity condition is applied.

Link to reproduction repo

n/a

[Akius1]

Hi! I spent some time tracing this through the source, including the published 2.17.2 dist packages, and I can share what I found so far. Quantity does appear to be plumbed through the cart pricing chain in 2.17.2: getVariantsAndItemsWithPrices builds a per-line-item context with quantity: item.quantity, updateLineItemInCartWorkflow includes update.quantity ?? item.quantity in its QueryContext, the variant→price-set link forwards arguments for calculated_price, and the pricing repository extracts context.quantity and applies the min/max window filter. So the missing quantity field on MedusaPricingContext (which types the setPricingContext hook result) doesn't by itself explain the symptom. Statically, the tier should match and win on amount asc within the price list.

Since the chain looks correct on paper but clearly fails in practice, I'd like to help triage this properly: I'll build a minimal reproduction with an integration test (override price list + customer-group rule + base price + min_quantity tier, cart quantity above the tier) to pinpoint exactly where quantity is dropped or the tier loses selection. If the test reproduces it, I'll follow up with a fix PR. If it passes, that narrows it to config/plugin interaction and I'll report that too. One question for the team meanwhile: given #11819 was closed as not planned, is quantity-tiered pricing inside price lists via the standard cart flow intended to be supported? (The pricing docs suggest yes.)

[medusa-os-bot]

Thanks for reporting this! We've labeled it as a bug and will investigate.

Detailed bug report (Medusa v2.17.2, PG17, Node 24): a price list of type override with a customer-group rule applies its base override price to a cart line item, but the quantity-tiered entry (min_quantity: 5, cheaper amount) is never selected even when line item quantity (8) exceeds the tier minimum; unit_price stays on the no-quantity tier. Reporter suspects the cart flow never passes line item quantity into price-list price resolution. Codebase trace, however, shows quantity IS plumbed through (get-variants-and-items-with-prices.ts and update-line-item-in-cart.ts set context.quantity), and the pricing repo (packages/modules/pricing/src/repositories/pricing.ts) applies the min/max window filter uniformly to price-list and default prices — so statically the tier should match. Root cause not confirmed; needs team reproduction. Possible edges to check: quantity passed as BigNumber vs plain number at pricing.ts window filter, and force_refresh not triggering recalculation on the…

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 3 days.

[jalagania]

This is still an issue.