No Reverse Match Error in Django

I am trying to complete the Codecademy project django delights. I am trying to create an ingredient update page that allows me to update the quantity and price per unit fields. I am getting the no reverse error message.

Reverse for 'ingredientupdate' with no arguments not found. 1 pattern(s) tried: ['ingredient/update/(?P<pk>[^/]+)\Z']

I am told to overwrite the get success url method but the documentation is not telling me what to pass in. I have tried reading the django documentation but get_success_url does not explain what to pass in. django documentation: Editing mixins | Django documentation | Django (edited)

Any advice?

urls.py


from django.contrib import admin
from django.urls import path, include
# from inventory.views import finance, home, IngredientsView, MenuView, PurchaseView
from inventory import views # with every view imported you need to specify views.viewname as seen in this file in the code below
from django.views.generic.base import TemplateView
from django.http import HttpResponse

urlpatterns = [
    
    path('', views.home, name='default'), # users don't need to see the rocket page anyway. they need to see the home page.
    path('admin/', admin.site.urls),
    path('finance/', views.finance, name='finance'),
    path('home/', views.home, name='home'), #I am attempting to connect the home_view function with the views function.
    path('ingredients/', views.IngredientsView.as_view(), name='ingredients'),
    path('menu/', views.MenuView.as_view(), name='menu'),
    path('purchases/', views.PurchaseView.as_view(), name='purchases'), 
    path('menu/add/',views.MenuAdditionView.as_view(success_url = "/menu/"), name="menuadd"),
    path('ingredients/add/', views.IngredientAdditionView.as_view(success_url = "/ingredients/"), name='ingredientadd'), # if class based view it requires an as_view
    path('ingredient/update/<pk>', views.UpdateIngredientView.as_view(success_url = "/ingredients/"), name='ingredientupdate'),
    path('recipe/add/', views.RecipeRequirementAdditionView.as_view(success_url = "/menu/"), name='recipeadd'),
    path('purchases/add/', views.PurchaseAdditionView.as_view(success_url = "/purchases/"), name = 'purchaseadd'),
    path('update/inventory/<int:pk>/', views.IngredientsListUpdateView.as_view(), name='updateinventory'), # update view so the view had to be edited.
    # cannot have conflicting path names or matching names
    # finance is not a classed based view therefore i do not need an as_view
    # error message views.finance() type error means I a. calling the fucntion wrong or I am not supposed to be calling it.
    # It needs to know what it is updating. 
    ]

views.py

from django.shortcuts import render
from django.urls import path, reverse_lazy
from .models import Ingredient, MenuItem, Purchases, RecipeRequirement
from django.views.generic import ListView
# import one at the time write the view for it hook it up in urls.py check if it works than move on to the next one. 
from .forms import MenuAdditionForm, IngredientAdditionForm, UpdateIngredientForm, RecipeAdditionForm # link the views and forms togather on this line
# errors can come from importing on the wrong django.views
from django.views.generic.edit import CreateView, UpdateView
from django.http import HttpResponse

# Create your views here.

def finance(request):
    purchased_items = Purchases.objects.all() # this grabs every row in the purchases table

    total_revenue = 0 
    for item in purchased_items:
        total_revenue = total_revenue + item.menu_order.price #this uses the price of each item to calculate the revenue
    
    print(str(total_revenue))
    total_cost= ingredient_cost_calculate()
    print(str(total_cost) + " this is the total cost calculation")

    total_profit= total_revenue - total_cost
    print(str(total_profit) + "total profit calculation amount")

    return render(request,'inventory/finance.html', {"total_revenue": total_revenue, "total_cost":total_cost, "total_profit": total_profit})    
    # i want the price of the item and the cost of each item.
    # what holds this information? my ingredient model. 
    # it holds the price per unit and the unit.
def ingredient_cost_calculate(): 
    # classes do not store information objects do. 
    # i need the cost per ingredient multiplied by quantity used.
    # I need to than for loop over all of the ingredients in a recipe and than apply the cost per ingredient function or 
    # the same mathematical operation. 
    # classes do not have the data, the objects do.
    # when the customer purchases something an entry is made in the purchases table. 
    # Purchases.objects.all() grabs all of the Purchases data and puts it in a list.
    purchases_objects = Purchases.objects.all() 
    # I need to find all of the ingredients per order. How do I get one order to find the ingredients on. 
    # I need to use a for loop to access each purchase. 
    menu_order_cost = 0 
    for purchase in purchases_objects:
        menu_item_object = purchase.menu_order 
        # recipe requirements is a list of data
        recipe_requirements = RecipeRequirement.objects.filter(recipe=menu_item_object)
        # we iterate over that list with a for loop and access the iteration variable quantity fields. 
        
        for requirement in recipe_requirements: 
            cost_per_ingredient = requirement.quantity * requirement.ingredient.price_per_unit
            menu_order_cost = menu_order_cost + cost_per_ingredient
    return menu_order_cost

    

    # the purchases are listed by names they do hold the ingredient data for each indvidual order. 

def home(request):
    return render(request,'inventory/home.html')

class MenuView(ListView):
    # when we specify the model being used for the template its almost as if we import or give access
    # to the html template the class data for us to use for loops and django code on. 
    model = MenuItem
    template_name = 'inventory/menu.html'

class PurchaseView(ListView):
    model = Purchases
    template_name = 'inventory/purchases.html'

class IngredientsView(ListView):
    model = Ingredient
    template_name = "inventory/ingredients.html"

class IngredientsListUpdateView(ListView):
    model = Ingredient
    template_name = "inventory/ingredients_update.html"
    
class MenuAdditionView(CreateView):
    model = MenuItem
    template_name = "inventory/form_template.html"
    form_class = MenuAdditionForm
    # fields = ["name", "description", "price"]

class IngredientAdditionView(CreateView):
    model = Ingredient
    template_name = 'inventory/form_template.html'
    form_class = IngredientAdditionForm

class UpdateIngredientView(UpdateView): # I am thinking this is an UpdateView
    model = Ingredient
    template_name = 'inventory/form_template.html'
    fields = ["quantity", "price_per_unit"]
    # success_url field attribute and reverse_lazy are used with updateview. upon successful completion of the viewd django
    # will route the user to the url with the name pattern of ingredientupdate
    def get_success_url():
        reverse_lazy('ingredientupdate')

    # fields = we need to input the fields of the columns that the provided model has.
    # per ken I need the get_success_url method. 

class RecipeRequirementAdditionView(CreateView):
    model = RecipeRequirement
    template_name = 'inventory/form_template.html'
    fields = ["ingredient", "recipe", "quantity"]

class PurchaseAdditionView(CreateView):
    model = Purchases
    template_name = 'inventory/form_template.html'
    fields = ["menu_order", "timestamp"]

# update view will require a <pk> or slug where I specify what I need to update.
# check out the codecademy section.
# https://www.codecademy.com/paths/build-python-web-apps-with-django/tracks/views-in-django/modules/django-writing-more-views/lessons/django-views/exercises/using-primary-keys-in-urls


# create a view based on the forms made.
# create a path to urls.py

from django.shortcuts import render
from django.urls import path, reverse_lazy
from .models import Ingredient, MenuItem, Purchases, RecipeRequirement
from django.views.generic import ListView

import one at the time write the view for it hook it up in urls.py check if it works than move on to the next one.

from .forms import MenuAdditionForm, IngredientAdditionForm, UpdateIngredientForm, RecipeAdditionForm # link the views and forms togather on this line

errors can come from importing on the wrong django.views

from django.views.generic.edit import CreateView, UpdateView
from django.http import HttpResponse

Create your views here.

def finance(request):
purchased_items = Purchases.objects.all() # this grabs every row in the purchases table

total_revenue = 0 
for item in purchased_items:
    total_revenue = total_revenue + item.menu_order.price #this uses the price of each item to calculate the revenue

print(str(total_revenue))
total_cost= ingredient_cost_calculate()
print(str(total_cost) + " this is the total cost calculation")

total_profit= total_revenue - total_cost
print(str(total_profit) + "total profit calculation amount")

return render(request,'inventory/finance.html', {"total_revenue": total_revenue, "total_cost":total_cost, "total_profit": total_profit})    
# i want the price of the item and the cost of each item.
# what holds this information? my ingredient model. 
# it holds the price per unit and the unit.

def ingredient_cost_calculate():
# classes do not store information objects do.
# i need the cost per ingredient multiplied by quantity used.
# I need to than for loop over all of the ingredients in a recipe and than apply the cost per ingredient function or
# the same mathematical operation.
# classes do not have the data, the objects do.
# when the customer purchases something an entry is made in the purchases table.
# Purchases.objects.all() grabs all of the Purchases data and puts it in a list.
purchases_objects = Purchases.objects.all()
# I need to find all of the ingredients per order. How do I get one order to find the ingredients on.
# I need to use a for loop to access each purchase.
menu_order_cost = 0
for purchase in purchases_objects:
menu_item_object = purchase.menu_order
# recipe requirements is a list of data
recipe_requirements = RecipeRequirement.objects.filter(recipe=menu_item_object)
# we iterate over that list with a for loop and access the iteration variable quantity fields.

    for requirement in recipe_requirements: 
        cost_per_ingredient = requirement.quantity * requirement.ingredient.price_per_unit
        menu_order_cost = menu_order_cost + cost_per_ingredient
return menu_order_cost



# the purchases are listed by names they do hold the ingredient data for each indvidual order. 

def home(request):
return render(request,‘inventory/home.html’)

class MenuView(ListView):
# when we specify the model being used for the template its almost as if we import or give access
# to the html template the class data for us to use for loops and django code on.
model = MenuItem
template_name = ‘inventory/menu.html’

class PurchaseView(ListView):
model = Purchases
template_name = ‘inventory/purchases.html’

class IngredientsView(ListView):
model = Ingredient
template_name = “inventory/ingredients.html”

class IngredientsListUpdateView(ListView):
model = Ingredient
template_name = “inventory/ingredients_update.html”

class MenuAdditionView(CreateView):
model = MenuItem
template_name = “inventory/form_template.html”
form_class = MenuAdditionForm
# fields = [“name”, “description”, “price”]

class IngredientAdditionView(CreateView):
model = Ingredient
template_name = ‘inventory/form_template.html’
form_class = IngredientAdditionForm

class UpdateIngredientView(UpdateView): # I am thinking this is an UpdateView
model = Ingredient
template_name = ‘inventory/form_template.html’
fields = [“quantity”, “price_per_unit”]
# success_url field attribute and reverse_lazy are used with updateview. upon successful completion of the viewd django
# will route the user to the url with the name pattern of ingredientupdate
def get_success_url():
reverse_lazy(‘ingredientupdate’)

# fields = we need to input the fields of the columns that the provided model has.
# per ken I need the get_success_url method. 

class RecipeRequirementAdditionView(CreateView):
model = RecipeRequirement
template_name = ‘inventory/form_template.html’
fields = [“ingredient”, “recipe”, “quantity”]

class PurchaseAdditionView(CreateView):
model = Purchases
template_name = ‘inventory/form_template.html’
fields = [“menu_order”, “timestamp”]

update view will require a or slug where I specify what I need to update.

check out the codecademy section.

https://www.codecademy.com/paths/build-python-web-apps-with-django/tracks/views-in-django/modules/django-writing-more-views/lessons/django-views/exercises/using-primary-keys-in-urls

create a view based on the forms made.

create a path to urls.py

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