我目前正在开发一个程序。现在我从来没有和Django合作过，我遇到了一些麻烦。
我正在尝试将一些表单字段保存到sqlite数据库中，但是我遇到了错误。
这是我得到的错误
ValueError at /recipes
The view brewery.views.recipes didn't return an HttpResponse object. It returned None instead.
Request Method: POST
Request URL: http://localhost:8000/recipes
Django Version: 4.0.2
Exception Type: ValueError
Exception Value:
The view brewery.views.recipes didn't return an HttpResponse object. It returned None instead.
Exception Location: C:UsersAdminAppDataRoamingPythonPython310site-packagesdjangocorehandlersbase.py, line 309, in check_response
Python Executable: C:Program FilesPython310python.exe
Python Version: 3.10.2
Python Path:
['C:\Users\Admin\Desktop\praktika\brew',
'C:\Program Files\Python310\python310.zip',
'C:\Program Files\Python310\DLLs',
'C:\Program Files\Python310\lib',
'C:\Program Files\Python310',
'C:\Users\Admin\AppData\Roaming\Python\Python310\site-packages',
'C:\Program Files\Python310\lib\site-packages',
'/home/ponasniekas/wwwpi/brew',
'/home/ponasniekas/wwwpi/brew/brew',
'/home/ponasniekas/wwwpi/brew/brew/brewery',
'/home/ponasniekas/.local/lib/python3.8/site-packages']
这是我的观点文件：
from django.http import HttpResponse
import json
from django.http import StreamingHttpResponse
from django.shortcuts import render
from django.core.serializers import serialize
from django.http import JsonResponse
from django.template import RequestContext
from .models import StockYeast, queryset_to_indexlist,queryset_to_array, Brew, Fermentable, Miscs, RecipeYeast, Recipes, Yeast,StockFermentables
from .models import Hop,StockHop,StockMiscs
from .forms import RecipeForm, RecipeFermentableForm, RecipeHopForm, RecipeMiscForm,RecipeWaterForm, RecipeYeastForm,RecipeMashForm, StockMiscForm
from .forms import StockFermentableForm,StockHopForm,StockYeastForm, StockMiscForm
from django.forms import formset_factory
def index(request):
return render(request, 'index.html')
def recipes(request):
if request.method == 'POST':
recipes = RecipeForm(request.POST)
if form.is_valid():
n = form.cleaned_data["name"]
t = Recipes(name=n)
t.save()
else:
recipes = Recipes.objects.all()
recipeFermentableFormset = formset_factory(RecipeFermentableForm, extra=1)
recipeHopFormset = formset_factory(RecipeHopForm, extra=1)
RecipeMiscFormSet= formset_factory(RecipeMiscForm, extra=1)
RecipeYeastFormSet = formset_factory(RecipeYeastForm,extra=1)
RecipeMashFormSet = formset_factory(RecipeMashForm,extra=1)
context = {
"recipes" : recipes,
"recipe_form" : RecipeForm(auto_id="recipe_%s"),
"recipe_fermentableformset":recipeFermentableFormset(prefix='fermentable'),
"recipe_hopformset":recipeHopFormset(prefix='hop'),
"recipe_miscformset":RecipeMiscFormSet(prefix='misc'),
"recipe_yeastformset":RecipeYeastFormSet(prefix='yeast'),
"recipe_mashformset" :RecipeMashFormSet(prefix='mash'),
"recipeWaterForm":RecipeWaterForm()
}
return render(request, 'recipes.html', context)
这是我的recipes.html文件：
{% block content %}
<!-- Modal -->
<div class="card shadow-sm">
<div class="card-header" id="headingOne">
<h5 class="mb-0"> Receptas</h5>
</div>
<div id="card-base" class="collapse show" aria-labelledby="headingOne" data-parent="#accordion">
<div class="card-body">
<div class="row">
<div class="col">
<form method="post" action="/recipes">
{% csrf_token %}
{{recipe_form.ibu}}
{{recipe_form.abv}}
<div class="row">
<div class="col">{{recipe_form.name|as_crispy_field}}</div>
<div class="col">{{recipe_form.style|as_crispy_field}}</div>
</div>
<div class="row">
<div class="col">{{recipe_form.batch_size|as_crispy_field}}</div>
<div class="col">{{recipe_form.boile_time|as_crispy_field}}</div>
<div class="col">{{recipe_form.efficiency|as_crispy_field}}</div>
</div>
<div class="row">
<div class="col">{{recipe_form.primary_age|as_crispy_field}}</div>
<div class="col">{{recipe_form.secondary_age|as_crispy_field}}</div>
<div class="col">{{recipe_form.age|as_crispy_field}}</div>
</div>
<div class="row">
<div class="col">{{recipe_form.pub_date|as_crispy_field}}</div>
</div>
<div class="row">
<div class="col">{{recipe_form.notes|as_crispy_field}}</div>
</div>
</div>
<span class="d-flex flex-row-reverse"><button class="btn btn-secondary" id="save_recipe_btn"
type="submit"><i class="bi bi-save"></i></br> Saugoti</button></span>
</form>
</div>
</div>
</div>
</div>
{% endblock %}
这是我的models.py文件：
class Recipes(models.Model):
name = models.CharField(max_length=120, default='')
pub_date = models.DateTimeField('date published')
style = models.CharField(max_length=200, default='')
brewer = models.CharField(max_length=100, default='')
type = models.CharField(max_length=20, default='All Grain')
version = models.CharField(max_length=20, default='1')
batch_size = models.DecimalField(decimal_places=2, max_digits=8, default=0.0)
boil_size = models.DecimalField(decimal_places=2, max_digits=8, default=0.0)
boil_time = models.DecimalField(decimal_places=1, max_digits=4, default=0.0)
efficiency = models.DecimalField(decimal_places=1, max_digits=4, default=75.0)
ibu = models.DecimalField(decimal_places=1, max_digits=4, default=0.0)
abv = models.DecimalField(decimal_places=2, max_digits=4, default=0.0)
notes = models.TextField(default='')
carbonation = models.DecimalField(decimal_places=2, max_digits=4, default=0.0)
primary_age = models.DecimalField(decimal_places=1, max_digits=4, default = 0)
secondary_age = models.DecimalField(decimal_places=1, max_digits=4, default = 0)
age = models.DecimalField(decimal_places=1, max_digits=4, default = 0)
__fermentables = []
@classmethod
def create(cls,attr):
recipe = cls()
# do something with the book
for k in Recipes._meta.fields:
if k.name in attr:
setattr(recipe,k.name,attr[k.name])
return recipe
@classmethod
def addFermentables(self,items):
for itm in items:
self.__fermentables.append(itm)
return self.__fermentables
@classmethod
def addHops(self,items):
for i in items:
return i
@classmethod
def addYeast(self,items):
for i in items:
return i
@classmethod
def addMashStep(self,items):
for i in items:
return i
class RecipeFermentable(models.Model):
recipe = models.ForeignKey(Recipes, on_delete=models.CASCADE)
name = models.CharField(max_length=200, default='')
amount = models.DecimalField(decimal_places=2, max_digits=8, default=0.0)
extract = models.DecimalField(decimal_places=1, max_digits=8, default=0.0)
type = models.CharField(max_length=20, default='')
color= models.DecimalField(decimal_places=1, max_digits=8, default=0.0)
fermentable = models.ForeignKey(Fermentable, on_delete=models.RESTRICT)
def create(cls, attr, recipes):
fermentables = cls()
# do something with the book
for k in RecipeFermentable._meta.fields:
if k.name in attr:
setattr(recipe,k.name,attr[k.name])
return fermentables
class RecipeHops(models.Model):
recipe = models.ForeignKey(Recipes, on_delete=models.CASCADE)
name = models.CharField(max_length=200, default='')
alpha = models.DecimalField(decimal_places=1, max_digits=4, default=0.0)
amount = models.DecimalField(decimal_places=2, max_digits=8, default=0.0)
use = models.CharField(max_length=10, default='')
hop = models.ForeignKey(Hop, on_delete=models.RESTRICT)
time = models.DecimalField(decimal_places=1, max_digits=4, default=0.0)
这是我的表格文件：
from django import forms
from tempus_dominus.widgets import DatePicker
from .models import Fermentable, Hop, Yeast, Miscs,queryset_to_indexlist
from django.db import models
import json
import datetime
class RecipeForm(forms.Form):
recipe = forms.CharField(widget=forms.HiddenInput())
ibu = forms.CharField(widget=forms.HiddenInput())
abv = forms.CharField(widget=forms.HiddenInput())
name = forms.CharField(label="Recepto pavadinimas",
widget=forms.TextInput(attrs={}),
max_length=80,
required=True,
localize=False,
disabled=False,
help_text="")
style = forms.CharField(label="Stilius",
widget=forms.TextInput(attrs={}),
max_length=80,
required=True,
localize=False,
disabled=False,
help_text="")
pub_date = forms.DateField(label="Data:",
initial = datetime.datetime.today,
widget = DatePicker(
options={
'minDate': '2009-01-01',
'maxDate': '2050-12-31',
},)
)
batch_size = forms.CharField(label="Kiekis:",
widget=forms.TextInput(attrs={}),
max_length=80,
initial="1000",
required=True,
localize=False,
disabled=False,
help_text="")
efficiency = forms.CharField(label="Efektyvumas",
widget=forms.TextInput(attrs={}),
max_length=80,
initial="85",
required=True,
localize=False,
disabled=False,
help_text="")
boile_time = forms.CharField(label="Virimo laikas",
widget=forms.TextInput(attrs={}),
max_length=80,
initial="90",
required=True,
localize=False,
disabled=False,
help_text="")
carbonation = forms.CharField(label="Virimo laikas",
widget=forms.TextInput(attrs={}),
max_length=80,
initial="90",
required=True,
localize=False,
disabled=False,
help_text="")
primary_age = forms.CharField(label="Fermentacijos laikas (I)", widget=forms.TextInput(attrs={}))
secondary_age = forms.CharField(label="Fermentacijos laikas (II)", widget=forms.TextInput(attrs={}))
age = forms.CharField(label="Brandinimo laikas", widget=forms.TextInput(attrs={}))
notes = forms.CharField(label="Pastabos", widget=forms.TextInput(attrs={}))
我在看一些教程时做了所有的事情，我觉得我做的所有事情都是正确的，然而，它似乎不起作用。
有人能告诉我我在这里做错了什么吗？请记住，这将是一种与配方、可发酵配方、啤酒花等的多对一关系。然而，对于初学者来说，我试图只保存配方的基本部分。
您的views.py中有一个打字错误
def recipes(request):
if request.method == 'POST':
form = RecipeForm(request.POST) <------ change recipes to form or use recipes in below form valid and cleaned_data
if form.is_valid():
n = form.cleaned_data["name"]
t = Recipes(name=n)
t.save()
现在我在/precipes 上得到一个不同的错误
ValueError
这意味着您在保存配方后没有返回任何HttpResponse。因此，在成功创建配方数据后，可以在任意位置返回HttpResponse或redirect。
from django.http import HttpResponse
def recipes(request):
if request.method == 'POST':
form = RecipeForm(request.POST)
if form.is_valid():
n = form.cleaned_data["name"]
t = Recipes(name=n)
t.save()
# Return a "created" (201) response code.
return HttpResponse('Recipe Saved Sucessfully', status=201)
如果您不想在表单验证后添加任何内容，那么您可以直接将数据保存为
if form.is_valid():
form.save()
# Return a "created" (201) response code.
return HttpResponse('Recipe Saved Sucessfully', status=201)