Django的:在基于类的ListView搜索表单 [英] Django: Search form in Class Based ListView
问题描述
我想实现类的ListView基
其中显示选择的表集。如果站点请求在第一时间,应显示的数据集。我想preFER一个POST提交,但得到的也就好了。
这是一个问题,这是很容易与基于功能视图
,但基于类的意见我也很难左右让我的头处理。
我的问题是,我得到一个不同的号码错误的,这是由我有限的归类为本次的理解造成的。我已阅读各种文档和我理解的观点直接查询请求,但只要我想一个表单添加到查询语句中,我遇到不同的错误。对于下面的code,我收到一个 ValueError错误:无法使用无作为查询值
什么将是依赖于表单提交,基于类的ListView(否则选择整个数据库)?最佳实践工作流程
这是我的样本code:
models.py
类档案(models.Model):
名称= models.CharField(_(名称),MAX_LENGTH = 255) 高清__uni code __(个体经营):
回报%名称'%{'名':self.name} @staticmethod
高清get_queryset(PARAMS): DATE_CREATED = params.get('DATE_CREATED')
关键字= params.get(关键字)
展示Qset = Q(pk__gt = 0)
if关键字:
展示Qset&安培; = Q(title__icontains =关键字)
如果DATE_CREATED:
展示Qset&安培; = Q(date_created__gte = DATE_CREATED)
返回展示Qset
forms.py
类ProfileSearchForm(forms.Form):
名称= forms.CharField(必填= FALSE)
views.py
类ProfileList文件(ListView控件):
模型=简介
form_class = ProfileSearchForm
context_object_name ='个人资料'
TEMPLATE_NAME ='页/型材/ list_profiles.html
型材= []
高清后期(个体经营,请求,* ARGS,** kwargs):
self.show_results =假
self.object_list = self.get_queryset()
形式= form_class(self.request.POST或无)
如果form.is_valid():
self.show_results = TRUE
self.profiles = Profile.objects.filter(name__icontains = form.cleaned_data ['名'])
其他:
self.profiles = Profile.objects.all()
返回self.render_to_response(self.get_context_data(object_list中= self.object_list,形式=形式)) 高清get_context_data(个体经营,** kwargs):
上下文=超(ProfileList文件,个体经营).get_context_data(** kwargs)
如果没有self.profiles:
self.profiles = Profile.objects.all()
context.update({
配置文件:self.profiles
})
回报方面
下面我添加了没有工作的FBV。 我怎么能这个功能转化为CBV?
这似乎是在基于函数的观点很简单,但不是基于类的意见。
高清list_profiles(要求):
form_class = ProfileSearchForm
模型=简介
TEMPLATE_NAME ='页/型材/ list_profiles.html
paginate_by = 10 形式= form_class(request.POST或无)
如果form.is_valid():
profile_list = model.objects.filter(name__icontains = form.cleaned_data ['名'])
其他:
profile_list = model.objects.all() 分页程序=分页程序(profile_list,10)#每页显示10个联系人
页= request.GET.get(页)
尝试:
型材= paginator.page(页)
除了PageNotAnInteger:
型材= paginator.page(1)
除了EmptyPage:
型材= paginator.page(paginator.num_pages) 返回render_to_response(TEMPLATE_NAME,
{形式:形式的个人资料:供应商,},
context_instance = RequestContext的(要求))
我觉得你的目标是试图基于表单提交,以过滤查询集如果是这样,通过使用GET:
类ProfileSearchView(ListView控件)
TEMPLATE_NAME ='/your/template.html
模型=人 高清get_queryset(个体经营):
尝试:
名称= self.kwargs ['名']
除:
名称=''
如果(名称=''!):
object_list中= self.model.objects.filter(name__icontains =名称)
其他:
object_list中= self.model.objects.all()
返回object_list中
然后,所有你需要做的是写一个 GET
方法来呈现模板和背景。
也许不是最好的方法。通过使用上述code,你不需要定义一个Django的形式。
下面是它的工作原理:基于类的观点分离的方式来呈现模板,处理表单等等。像 GET
处理GET响应,后
处理POST响应, get_queryset
和的get_object
是自我解释,等等。最简单的办法知道什么是可用的方法,启动一个shell,然后键入:
从django.views.generic进口的ListView
如果你想知道关于的ListView
然后键入 DIR(ListView控件)
。在那里,你可以看到定义的所有方法和就往源$ C $ C去了解它。使用了 get_queryset
方法来获取查询集。为什么不直接定义它像这样,它也能工作:
类FooView(ListView控件):
TEMPLATE_NAME ='foo.html'
查询集= Photo.objects.all()#或其他任何
我们可以做到这一点像上面,但是我们不能用这种方法进行动态过滤。通过使用 get_queryset
我们可以做动态过滤,用我们甲肝任何数据/价值/信息,这意味着我们也可以使用名称
参数是由 GET
,以及对 kwargs
,或在这种情况下, self.kwargs [some_key]
,其中 some_key
是您指定的任何参数
I am trying to realize a Class Based ListView
which displays a selection of a table set. If the site is requested the first time, the dataset should be displayed. I would prefer a POST submission, but GET is also fine.
That is a problem, which was easy to handle with function based views
, however with class based views I have a hard time to get my head around.
My problem is that I get a various number of error, which are caused by my limited understanding of the classed based views. I have read various documentations and I understand views for direct query requests, but as soon as I would like to add a form to the query statement, I run into different error. For the code below, I receive an ValueError: Cannot use None as a query value
.
What would be the best practise work flow for a class based ListView depending on form entries (otherwise selecting the whole database)?
This is my sample code:
models.py
class Profile(models.Model):
name = models.CharField(_('Name'), max_length=255)
def __unicode__(self):
return '%name' % {'name': self.name}
@staticmethod
def get_queryset(params):
date_created = params.get('date_created')
keyword = params.get('keyword')
qset = Q(pk__gt = 0)
if keyword:
qset &= Q(title__icontains = keyword)
if date_created:
qset &= Q(date_created__gte = date_created)
return qset
forms.py
class ProfileSearchForm(forms.Form):
name = forms.CharField(required=False)
views.py
class ProfileList(ListView):
model = Profile
form_class = ProfileSearchForm
context_object_name = 'profiles'
template_name = 'pages/profile/list_profiles.html'
profiles = []
def post(self, request, *args, **kwargs):
self.show_results = False
self.object_list = self.get_queryset()
form = form_class(self.request.POST or None)
if form.is_valid():
self.show_results = True
self.profiles = Profile.objects.filter(name__icontains=form.cleaned_data['name'])
else:
self.profiles = Profile.objects.all()
return self.render_to_response(self.get_context_data(object_list=self.object_list, form=form))
def get_context_data(self, **kwargs):
context = super(ProfileList, self).get_context_data(**kwargs)
if not self.profiles:
self.profiles = Profile.objects.all()
context.update({
'profiles': self.profiles
})
return context
Below I added the FBV which does the job. How can I translate this functionality into a CBV? It seems to be so simple in function based views, but not in class based views.
def list_profiles(request):
form_class = ProfileSearchForm
model = Profile
template_name = 'pages/profile/list_profiles.html'
paginate_by = 10
form = form_class(request.POST or None)
if form.is_valid():
profile_list = model.objects.filter(name__icontains=form.cleaned_data['name'])
else:
profile_list = model.objects.all()
paginator = Paginator(profile_list, 10) # Show 10 contacts per page
page = request.GET.get('page')
try:
profiles = paginator.page(page)
except PageNotAnInteger:
profiles = paginator.page(1)
except EmptyPage:
profiles = paginator.page(paginator.num_pages)
return render_to_response(template_name,
{'form': form, 'profiles': suppliers,},
context_instance=RequestContext(request))
I think your goal is trying to filter queryset based on form submission, if so, by using GET :
class ProfileSearchView(ListView)
template_name = '/your/template.html'
model = Person
def get_queryset(self):
try:
name = self.kwargs['name']
except:
name = ''
if (name != ''):
object_list = self.model.objects.filter(name__icontains = name)
else:
object_list = self.model.objects.all()
return object_list
Then all you need to do is write a get
method to render template and context.
Maybe not the best approach. By using the code above, you no need define a django form.
Here's how it works : Class based views separates its way to render template, to process form and so on. Like, get
handles GET response, post
handles POST response, get_queryset
and get_object
is self explanatory, and so on. The easy way to know what's method available, fire up a shell and type :
from django.views.generic import ListView
if you want to know about ListView
and then type dir(ListView)
. There you can see all the method defined and go visit the source code to understand it. The get_queryset
method used to get a queryset. Why not just define it like this, it works too :
class FooView(ListView):
template_name = 'foo.html'
queryset = Photo.objects.all() # or anything
We can do it like above, but we can't do dynamic filtering by using that approach. By using get_queryset
we can do dynamic filtering, using any data/value/information we hav, it means we also can use name
parameter that is sent by GET
, and its available on kwargs
, or in this case, on self.kwargs["some_key"]
where some_key
is any parameter you specified
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