Django表 - 列过滤 [英] Django Tables - Column Filtering
问题描述
我开始使用 django-tables2 (我可以从第一印象中强烈推荐)我问自己如何实现列过滤。我没有找到合适的文档,但我确定它在某处。
I started using django-tables2 (which I can highly recommend from the first impression) and I m asking myself how to implement column filtering. I do not find the appropriate documentation for it, but I m sure it is somewhere out there.
推荐答案
稍晚的答案反正我也找不到任何适用于列过滤的文档。有很多方法可以实现:
A little late answer but anyway ... I also couldn't find any appropriate documentation for column filtering. There are many methods to do it:
A。手动:我添加一个包含我要过滤的字段的表单,然后在我的视图中进行这样的操作:
A. By hand: I add a form containing the fields I'd like to filter with and then I do something like this in my view:
data = models.MyClass.all()
form = forms.MyFilterForm(request.GET)
if request.GET.get('field1'):
data = data.filter(field1=request.GET.get('field1') )
if request.GET.get('field2'):
data = data.filter(field2=request.GET.get('field2') )
...
table = tables.MyTable(data)
这个工作非常好然而,它并不那么干,因为它是视图中的硬编码。
This works very nice however it's not so DRY because it is hard coded in the view.
B。使用SingleTableView :另一种方法是添加一个包含以下形式的SingleTableView:
B. Using a SingleTableView: Another way is to add a SingleTableView that contains the form:
from django_tables2 import SingleTableView
class FilteredSingleTableView(SingleTableView):
def get_table_data(self):
data= models.MyClass.objects.all
if self.request.GET.get('field1'):
data = data.filter(field1=self.request.GET.get('field1') )
if self.request.GET.get('field1'):
data = data.filter(field1=self.request.GET.get('field1') )
return data
def get_context_data(self, **kwargs):
context = super(FilteredSingleTableView, self).get_context_data(**kwargs)
context['form'] = forms.MyFilterForm(self.request.user, self.request.GET)
return context
更多DRY:)
C。使用SingleTableView和django_filters :这可能是最DRY的方式:)以下是如何做到:
C. Using SingleTableView and django_filters: This probably is the most DRY way :) Here's how to do it:
首先定义一个过滤器:
class MyFilter(django_filters.FilterSet):
field1 = django_filters.CharFilter()
field2 = django_filters.CharFilter()
...
(或者您可以在Meta(model = MyModel)中添加模型过滤器
(or you can add a model filter in Meta ( model = MyModel)
现在,创建一个这样的SingleTableView
Now, create a SingleTableView like this
class FilteredSingleTableView(SingleTableView):
def get_table_data(self):
f = filters.MyFilter(self.request.GET, queryset =models.MyClass.objects.all() , request=self.request )
return f
def get_context_data(self, **kwargs):
context = super(FilteredSingleTableView, self).get_context_data(**kwargs)
f = filters.MyFilter(self.request.GET, queryset =models.MyClass.objects.all() , request=self.request )
context['form'] = f.form
return context
(可能是行f = ...有一个问题,但我无法使其它工作。
(probably there is a problem with the line f =... but I couldn't make it work otherwise.
最后,您可以像这样从urls.py调用SingleTableView
Finally, you can call the SingleTableView from your urls.py like this
url(r'^$', views.FilteredSingleTableView.as_view(
table_class = tables.MyTable,
model=models.MyClass,
template_name ='mytemplate.html',
table_pagination={ "per_page":50 } )) ,
name='filtered_single_table_view'
),
D.使用通用类:这是一个更加干燥和django泛型类视图的方式!这实际上是从 C 的下一步:只需声明您的FilteredSingleTableView,如下所示:
D. Using a generic class: This is an even more DRY and django-generic-class-views like way! This is actually the next step from C: Just declare your FilteredSingleTableView like this:
class FilteredSingleTableView(django_tables2.SingleTableView):
filter_class = None
def get_table_data(self):
self.filter = self.filter_class(self.request.GET, queryset =super(FilteredSingleTableView, self).get_table_data() )
return self.filter.qs
def get_context_data(self, **kwargs):
context = super(FilteredSingleTableView, self).get_context_data(**kwargs)
context['filter'] = self.filter
return context
现在,FilteredSingleTableView有一个参数对于过滤器的类,您可以将其传递到其他参数中的urls.py中:
Now the FilteredSingleTableView has a parameter for the class of the filter so you may pass it in your urls.py among the other parameters:
url(r'^$', ships.views.FilteredSingleTableView.as_view(
model=models.MyModel,
table_class=tables.MyTable,
template_name='mytemplate.html' ,
filter_class = filters.MyFilter,
) , name='myview'),
所以你可以使用FilteredSingleTableView,而无需修改过滤您的任何模型!!
So you can use FilteredSingleTableView without modifications for filtering any of your models !!
另请注意,我现在已将过滤器保存为实例变量,并删除重复代码 f = filters.MyFilter(...)
我在 C (get_table_data在get_context_data之前调用) - 如果不是这样,那么我们可以添加一个 get_filter
实例方法,这将是诀窍)!
Also notice that I've now saved the filter as an instance variable and removed the repetitive code f=filters.MyFilter(...)
that I had in C (get_table_data is called before get_context_data - if that was not always the case then we could add an get_filter
instance method that would do the trick) !
更新23/04/2016 :在受欢迎的需求之后,我创建了一个简单的Django项目,它使用通用的FilteredSingleTableView类来过滤一张图表。您可以在以下网址找到: https://github.com/spapas/django_table_filtering
更新05/07/2016 :请注意,您应该使用 return self.filter.qs
D 中的 get_table_data
返回(我已经通过此更新了答案),否则视图将花费太长时间才能呈现给大桌子 - - 有关 https://github.com/spapas/django_table_filtering/issues/1
Update 05/07/2016: Please notice that you should use return self.filter.qs
for the get_table_data
return in D (I've alread updated the answer with this) or else the view will take too long to render for big tables -- more info can be found on https://github.com/spapas/django_table_filtering/issues/1
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