问题描述
我正在为网站创建一个简单的页面版本控制系统。我想要能够将一个页面传递给一个表单,它指向与该页面相关的所有版本,并且该表单下拉列表包含该页面的所有版本,并使初始页面版本成为理想版本在视图中初始化。到目前为止,表单将填写页面的所有版本,但不会选择最初版本的初始项目。
如何设置初始项目的初始项目在表单在视图中初始化时,如果字段被填充,则表单中的字段为
研究:
我在以下问题中尝试过答案,但没有一个解决方案:
- Django:如何设置内嵌模型表单中字段的初始值?
示例代码
models.py
从django.db导入模型
从autoslug import AutoSlugField
from django_enumfield import enum
from ..users.models import User
def write_page(name,submitter,content =''):
page = Page。 object.get_or_create(name = name)[0]
page_version = PageVersion.create(页面,提交者,内容)
返回page_version
类状态(enum.Enum):
DISABLED = 0
ACTIVE = 1
类页(models.Model):
name = models.CharField (max_length = 100)
slug = AutoSlugField(populate_from ='name',unique = True)
status = enum.EnumField(Status,default = Status.ACTIVE)
current_version = models.IntegerField (default = 0)
def __unicode __(self):
name_str =(name ='{}',slug ='{}')
return name_str.format (S elf.name,self.slug)
@property
def version(self):
status =(status = {}format(Status.ACTIVE)
order_by =(-version)
return self.pageversion_set.extra(where = status,order_by = order_by)
@property
def all_versions(self):
order_by =(-version,)
返回self.pageversion_set.extra(order_by = order_by)
@property
def ideal(self):
try:
return PageVersion.objects.get(id = self.current_version)
except self.DoesNotExist:
return None
@property
def version(self):
if self.ideal:
return self.ideal.version
return 0
@property
def content(self):
if self.ideal:
return self.ideal.content
return''
@property
def submitter(self) :
if self.ideal:
return self.ideal.submitter
return None
@classmethod
def create(cls,name )
page_object = cls.objects.create(name = name)
return page_object
class PageVersion(models.Model):
parent = models.ForeignKey(Page)
version = models.IntegerField(default = 0)
content = models.TextField()
date = models.DateTimeField(auto_now_add = True)
status = enum.EnumField(Status,default = Status.ACTIVE)
submitter = models.ForeignKey(User)
def __unicode __(self):
name_str = (name ='{}',slug ='{}',version = {})
return name_str.format(self.name,self.slug,self.version)
@property
def name(self):
return self.parent.name
@property
def slug(self):
return self.parent .slug
@classmethod
def创建(cls,page,submitter,content ='',make_current = True):
如果page.all_versions:
current_max_version = max([i.version for i in page.all_versions])
else:
current_max_version = 0
page_version_object = cls(parent = page,submitter = submitter,content = content)
page_version_object.version = current_max_version + 1
page_version_object .save()
如果make_current:
page.current_version = page_version_object.id
page.save()
返回page_version_object
forms.py
<$ p $来自django的表单
从$。$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $
$ b class PageVersionForm(forms.Form) = forms.ModelChoiceField(queryset = None)
def __init __(self,* args,** kwargs):
page = kwargs.pop(page)
super PageVersionFor m,self).__ init __(* args,** kwargs)
self.fields [version]。queryset = page.versions
views.py
from django.shortcuts import get_object_or_404,从django.http导入
导入HttpResponseRedirect,HttpResponseForbidden
from django.core.urlresolvers import reverse
from .models import Page,write_page
from .forms import pageForm,PageVersionForm
from ..helpers import get_pages
def update_page(request,slug):
如果没有request.user.has_perm(can_edit_page):
return HttpResponseForbidden()
page = get_object_or_404(Page,slug = slug)
如果request.method ==POST:
form = PageForm(request.POST)
如果form.is_valid():
content = form.cleaned_data [content]
user = request.user
write_page(name = page.name,submitter = user,content = content)
kwargs = {}
kwargs [slug] = slug
返回HttpResponseRedirect(reverse(pages:detail,kwargs = kwargs))
else =
data = {}
data [content] = page.content
form = PageForm(data)
context = {}
page_version_form = PageVersionForm(page = page)
上下文[form] = form
上下文[page_version_form] = page_version_form
上下文[page ] = page
上下文[user] = request.user
context.update(get_pages())
返回渲染(请求,pages / page_update.html ,上下文)
您需要重置选项
属性,因为它被缓存在字段上,一旦设置了queryset,即使更新 queryset
属性也不会重新生效。
def __init __(self,* args,** kwargs):
...
self.fields ['version']。queryset = page.versions
self.fields ['version']。widget.choices = self.fields ['version']。choices
您可以检查Django版本中的 ModelChoiceField
是否具有setter方法命名为的?它似乎在github中被修复。
I'm trying to create a simple page versioning system for a website. I want to be able to pass a page into a form, which points to all of the versions related to the page, and have the form dropdown contain all of the versions for that page, and make the initial page version the ideal version when it is initialized in the view. So far, the form will fill with all of the versions for the page, but not select the ideal version as the initial item.
How do I set the initial item of a field in a form if the field gets populated while the form is initialized in the view?
Research:
I have tried the answers in the following questions, but none of them had the solution:
- Setting initial value of Django ModelChoiceField
- Django: How to set initial values for a field in an inline model formset?
- Setting initial value of Django ModelChoiceField
Example code:
models.py
from django.db import models
from autoslug import AutoSlugField
from django_enumfield import enum
from ..users.models import User
def write_page(name, submitter, content=''):
page = Page.objects.get_or_create(name=name)[0]
page_version = PageVersion.create(page, submitter, content)
return page_version
class Status(enum.Enum):
DISABLED = 0
ACTIVE = 1
class Page(models.Model):
name = models.CharField(max_length=100)
slug = AutoSlugField(populate_from='name', unique=True)
status = enum.EnumField(Status, default=Status.ACTIVE)
current_version = models.IntegerField(default=0)
def __unicode__(self):
name_str = "(name='{}', slug='{}')"
return name_str.format(self.name, self.slug)
@property
def versions(self):
status = ("status = {}".format(Status.ACTIVE),)
order_by = ("-version",)
return self.pageversion_set.extra(where=status, order_by=order_by)
@property
def all_versions(self):
order_by = ("-version",)
return self.pageversion_set.extra(order_by=order_by)
@property
def ideal(self):
try:
return PageVersion.objects.get(id=self.current_version)
except self.DoesNotExist:
return None
@property
def version(self):
if self.ideal:
return self.ideal.version
return 0
@property
def content(self):
if self.ideal:
return self.ideal.content
return ''
@property
def submitter(self):
if self.ideal:
return self.ideal.submitter
return None
@classmethod
def create(cls, name):
page_object = cls.objects.create(name=name)
return page_object
class PageVersion(models.Model):
parent = models.ForeignKey(Page)
version = models.IntegerField(default=0)
content = models.TextField()
date = models.DateTimeField(auto_now_add=True)
status = enum.EnumField(Status, default=Status.ACTIVE)
submitter = models.ForeignKey(User)
def __unicode__(self):
name_str = "(name='{}', slug='{}', version={})"
return name_str.format(self.name, self.slug, self.version)
@property
def name(self):
return self.parent.name
@property
def slug(self):
return self.parent.slug
@classmethod
def create(cls, page, submitter, content='', make_current=True):
if page.all_versions:
current_max_version = max([i.version for i in page.all_versions])
else:
current_max_version = 0
page_version_object = cls(parent=page, submitter=submitter, content=content)
page_version_object.version = current_max_version + 1
page_version_object.save()
if make_current:
page.current_version = page_version_object.id
page.save()
return page_version_object
forms.py
from django import forms
from .models import PageVersion
class PageVersionForm(forms.Form):
version = forms.ModelChoiceField(queryset=None)
def __init__(self, *args, **kwargs):
page = kwargs.pop("page")
super(PageVersionForm, self).__init__(*args, **kwargs)
self.fields["version"].queryset = page.versions
views.py
from django.shortcuts import get_object_or_404, render
from django.http import HttpResponseRedirect, HttpResponseForbidden
from django.core.urlresolvers import reverse
from .models import Page, write_page
from .forms import PageForm, PageVersionForm
from ..helpers import get_pages
def update_page(request, slug):
if not request.user.has_perm("can_edit_page"):
return HttpResponseForbidden()
page = get_object_or_404(Page, slug=slug)
if request.method == "POST":
form = PageForm(request.POST)
if form.is_valid():
content = form.cleaned_data["content"]
user = request.user
write_page(name=page.name, submitter=user, content=content)
kwargs = {}
kwargs["slug"] = slug
return HttpResponseRedirect(reverse("pages:detail", kwargs=kwargs))
else:
data = {}
data["content"] = page.content
form = PageForm(data)
context = {}
page_version_form = PageVersionForm(page=page)
context["form"] = form
context["page_version_form"] = page_version_form
context["page"] = page
context["user"] = request.user
context.update(get_pages())
return render(request, "pages/page_update.html", context)
You need to reset choices
property as it is cached on the field once queryset is set and is not revalidated even if you update queryset
property.
def __init__(self, *args, **kwargs):
...
self.fields['version'].queryset = page.versions
self.fields['version'].widget.choices = self.fields['version'].choices
Can you check if ModelChoiceField
in your Django version has a setter method named _set_queryset
? It seems to be fixed in github.
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