✨ Start on error handling

♻ Use TypedDocumentNode's instead of apollo-react-typescript codegen
💄 Add toast

main/api/errors.py

@@ -0,0 +1,22 @@
+import strawberry
+
+
+@strawberry.interface
+class Error:
+    message: str
+
+    @strawberry.field()
+    def error(self) -> bool:
+        return True
+
+
+@strawberry.type
+class FieldError(Error):
+    field: str
+
+
+@strawberry.type
+class FormErrors:
+    fields: list[FieldError]
+    message: str = ''
+    error: bool = True

main/api/mutations.py

@@ -0,0 +1,66 @@
+import strawberry
+from django.contrib.auth import get_user_model
+from django.db import transaction
+from django.shortcuts import get_object_or_404
+from strawberry import ID
+
+from main import models
+from main.api.errors import Error, FormErrors, FieldError
+from main.api.types import Order
+
+UserModel = get_user_model()
+
+
+@strawberry.input
+class OrderLineInput:
+    product_id: ID
+    amount: int
+
+
+@strawberry.type
+class CreateOrderSuccess:
+    order: Order
+
+
+@strawberry.type
+class InsufficientFunds(Error):
+    amount_lacking: float
+
+
+Response = strawberry.union("CreateOrderResponse", [CreateOrderSuccess, InsufficientFunds, FormErrors])
+
+
+@strawberry.mutation
+@transaction.atomic
+def create_order(customer_id: ID, order_lines: list[OrderLineInput], is_external: bool = False) -> Response:
+    # clean and validate
+    try:
+        customer = UserModel.objects.get(pk=customer_id)
+    except (UserModel.DoesNotExist, ValueError):
+        customer = None
+
+    if customer is None and not is_external:
+        message = "Du har ikke valgt hvem som skal kjøpe."
+        return FormErrors(
+            message=message,
+            fields=[FieldError(field="customer_id", message=message)],
+        )
+
+    ols = []
+    order_sum = 0
+    for ol in order_lines:
+        product = get_object_or_404(models.Product, pk=ol.product_id)
+        price = product.sale_price_ext if is_external else product.sale_price_int
+        ols.append(models.OrderLine(product=product, amount=ol.amount, unit_price=price))
+        order_sum += ol.amount * price
+
+    if not is_external and customer.profile.balance <= order_sum:
+        return InsufficientFunds(amount_lacking=abs(order_sum - customer.profile.balance))
+
+    # create
+    order = models.Order.objects.create(customer=customer, order_sum=order_sum)
+    for ol in ols:
+        ol.order = order
+    models.OrderLine.objects.bulk_create(ols)
+
+    return CreateOrderSuccess(order=order)

main/api/schema.py

@@ -1,13 +1,20 @@
 import strawberry
 import strawberry_django
 
-from main.api.types import Product, User
+from main.api import mutations
+from main.api.types import Product, User, Order
 
 
 @strawberry.type
 class Query:
     all_products: list[Product] = strawberry_django.field()
     all_users: list[User] = strawberry_django.field()
+    all_orders: list[Order] = strawberry_django.field()
 
 
-schema = strawberry.Schema(query=Query)
+@strawberry.type
+class Mutation:
+    create_order = mutations.create_order
+
+
+schema = strawberry.Schema(query=Query, mutation=Mutation)

main/api/types.py

@@ -43,3 +43,11 @@ class User:
     last_name: auto
     profile: UserProfile
     # todo
+
+
+@strawberry_django.type(models.Order)
+class Order:
+    id: auto
+    customer: 'User'
+    order_sum: auto
+    created: auto