構建Django的過濾器動態查詢與指定參數和kwargs

我動態構建一些Django的過濾器的查詢，using this example：構建Django的過濾器動態查詢與指定參數和kwargs

kwargs = { 'deleted_datetime__isnull': True } 
args = (Q(title__icontains = 'Foo') | Q(title__icontains = 'Bar')) 
entries = Entry.objects.filter(*args, **kwargs)

我只是不知道如何構建條目args。說我有此數組：

strings = ['Foo', 'Bar']

如何從那裏到：

args = (Q(title__icontains = 'Foo') | Q(title__icontains = 'Bar')

我能得到的最接近的是：

for s in strings: 
    q_construct = Q(title__icontains = %s) % s 
    args.append(s)

但我不知道該怎麼設置|的條件。

來源

2011-12-14 Richard

您可以直接使用kwarg格式重複它（我不知道正確的術語）

argument_list = [] #keep this blank, just decalring it for later 
fields = ('title') #any fields in your model you'd like to search against 
query_string = 'Foo Bar' #search terms, you'll probably populate this from some source 

for query in query_string.split(' '): #breaks query_string into 'Foo' and 'Bar' 
    for field in fields: 
     argument_list.append(Q(**{field+'__icontains':query_object})) 

query = Entry.objects.filter(reduce(operator.or_, argument_list)) 

# --UPDATE-- here's an args example for completeness 

order = ['publish_date','title'] #create a list, possibly from GET or POST data 
ordered_query = query.order_by(*orders()) # Yay, you're ordered now!

這將尋找每根弦在query_string在各個領域中fields和OR結果

我希望我仍然有我的原始來源，但這是從我使用的代碼改編的。

來源

2011-12-14 19:07:33

在一個側面說明，現在`是reduce``functools.reduce`在Python 3 https://docs.python.org/3.0/library/ functools.html＃functools.reduce – wasabigeek 2017-03-01 04:58:47

你有Q類對象列表，

args_list = [Q1,Q2,Q3] # Q1 = Q(title__icontains='Foo') or Q1 = Q(**{'title':'value'}) 
args = Q() #defining args as empty Q class object to handle empty args_list 
for each_args in args_list : 
    args = args | each_args 

query_set= query_set.filter(*(args,)) # will excute, query_set.filter(Q1 | Q2 | Q3) 
# comma , in last after args is mandatory to pass as args here

來源

2013-04-07 06:40:30 Roshan

構建Django的過濾器動態查詢與指定參數和kwargs

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