stark組件3_filter過濾
阿新 • • 發佈:2018-08-10
情況 php publish book 其它 get temp 有效 出版 過濾項
在配置類中定義,title字段沒什麽意義,這次僅作演示用
list_filter = ["title", "publish", "authors"]
調用和取數據
調用:
filter_condition = self.get_filter_condition(request)
取出數據:
連續兩個filter之間是且的關系,等於取出符合這兩個條件的數據
data_list = self.model.objects.all().filter(search_condition).filter(filter_condition)
處理邏輯
def get_filter_linktag(self): link_dic = {} #--------------------數據處理邏輯------------------------- #循環過濾項列表 for filter_field in self.config.list_filter: #["title", "publish", "authors"] #獲取request.GET中相應是哪個字段 #舉例:http://127.0.0.1:8000/stark/app01/book/?publish=2 #當循環到publish時獲取這個2 cid = self.request.GET.get(filter_field, 0) #根據字符串名稱拿字段對象,self.config是當前這張表的配置類實例對象 filter_field_obj = self.config.model._meta.get_field(filter_field) #print("filter_field_obj==>", filter_field_obj) #得到app01.Book.publish和app01.Book.authors #拿對象下面的數據 #.rel .to 來自於ForeignKey和ManyToManyField這兩個類 #.rel可以看到對象的數據類型,加上.to可以拿到對象下面的數據,.to只對一對一,一對多,多對多有效 #print(filter_field_obj.rel.to) #結果: #< class ‘app01.models.Publish‘> #< class ‘app01.models.Author‘> #判斷當前字段對象是不是一對多或多對多類型(需要提前引入這兩個類),兩種情況取得值也有所不懂 if isinstance(filter_field_obj, ForeignKey) or isinstance(filter_field_obj, ManyToManyField): #如果是的話就取這個字段關聯的內容 data_list = filter_field_obj.rel.to.objects.all() #[publish1, publish2....] # print("data_list==>", data_list) # < QuerySet[ < Publish: 圖靈新知 >, < Publish: dzm >, < Publish: 老男孩出版社 >] > # < QuerySet[ < Author: egon >, < Author: alex >] > else:#如果不是的話直接取字段對象的內容,這裏只取主鍵和當前filter_field的值,比如當前正好是"title" data_list = self.config.model.objects.all().values("pk", filter_field) #print("data_list==>", data_list) #data_list==> <QuerySet [{‘pk‘: 7, ‘title‘: ‘go語言第三版‘}, {‘pk‘: 8, ‘title‘: ‘linux‘} #----------------頁面渲染--------------- temp = [] #拷貝一份request.GET 用於修改 params = copy.deepcopy(self.request.GET) #處理ALL標簽 #如果params(request.GET)中有值 if params.get(filter_field): #刪除字典中原有的filter_field(例如是"publish"),但保留其它字段的內容 del params[filter_field] #添加html到列表,此處需要把params序列化 temp.append(mark_safe("<a href=‘?%s‘>ALL</a>" %params.urlencode())) else: #如果沒有值 temp.append(mark_safe("<a href=‘‘>ALL</a>")) #處理數據標簽 #將data_list循環起來 < QuerySet[ < Publish: 圖靈新知 >, < Publish: dzm >...] > for obj in data_list: #判斷當前字段對象是不是一對多或多對多 if isinstance(filter_field_obj, ForeignKey) or isinstance(filter_field_obj, ManyToManyField): #此時的obj是一個個對象,取主鍵值和文本內容 pk = obj.pk text = str(obj) #圖靈新知 params[filter_field] = pk #結果<QueryDict: {‘publish‘: [2]}> else: #如果不是 #此時的obj是QuerySet{‘pk‘: 10, ‘title‘: ‘PHP‘} pk = obj.get("pk") text = obj.get(filter_field) params[filter_field] = text #params裏面是QueryDict(<QueryDict: {‘publish‘: [2]}>),所以要做序列化 _url = params.urlencode() #給選中內容加高亮 if cid == str(pk) or cid == text: link_tag = "<a href=‘?%s‘ class=‘action‘>%s</a>" % (_url, text) else: link_tag = "<a href=‘?%s‘>%s</a>" % (_url, text) #添加到temp列表 temp.append(mark_safe(link_tag)) #構建字典用作返回 link_dic[filter_field] = temp #{‘publish‘: ["<a href=‘‘>ALL</a>", "<a href=‘?title=go%E8%AF%AD%E8%A8%80%E7%AC%AC%E4%B8%89%E7%89%88&publish=2‘>圖靈新知</a>"... return link_dic
stark組件3_filter過濾