在我的Django应用程序中,我有一个出版模型和一个标签模型,它们有很多关系。假设我有四个标签:男士,女士,时尚,设计。我想找到所有与其相关联的男性或女性标签的出版物,以及与之相关的时尚或设计标签。例如,在搜索字段中,我可以输入:(men || women)&& (时尚||设计)。换句话说,结果应该产生每个或对中至少一个标签的出版物。
我已经弄清楚如何做一个或搜索(即查找所有具有男性或女性标签或时尚或设计的出版物),并且我已经弄清楚如何做一个搜索(即查找所有标签,男人和女人的所有出版物和时尚和设计),但我不知道最有效的方法来做和组合。
到目前为止,我已经分离了查询字符串以获取或对的列表,我开始创建一个搜索谓词,但后来我想,我做这些结果?例如...
if request中的'qTag'.GET: or_queries = request.GET ['qTag '] .split('&&') $ b $ or在or_queries中的or_query: or_query_set = or_query.split()在or_query_set中的sub_query: if pub_predicate: pub_predicate = pub_predicate | Q(tags__title__istartswith = sub_query) else: pub_predicate = Q(tags__title__istartswith = sub_query) pubs_for_set = Publication.objects.filter(pub_predicate).distinct() pubs_for_tags.append pubs_for_set) pub_predicate =无 pubs_for_set =无列表(pubs_for_tags)的列表(pubs_for_set),为每个或对提供所有结果。但现在什么?我不知道如何进行和搜索任何人都可以建议一种方式这个?
解决方案我不知道是否有办法做到这一点,我想说试试把过滤器与Q但是后来又想到了:
在Django查询中组合AND OR
和
AND OR Django查询II
In my Django app I have a Publication model and a Tag model which have a many to many relationship.
Let's say I have four tags: men, women, fashion, design. I want to find all publications that have a men OR women tag associated with it, AND a fashion OR design tag associated with it. For example, in a search field I might enter: (men || women) && (fashion || design). In other words, the results should yield publications that have at least one tag from each 'or' pair.
I have figured out how to do just an 'or' search (i.e. find all publications with a tag of men or women or fashion or design) and I have figured out how to do just an and search (i.e. find all publications that have all the tags, men and women and fashion and design), but I do not know the most efficient way to do the and-or combo.
Thus far I have split up the query string to get a list of 'or' pairs, and I started to create a search predicate, but then I thought, what will I do with these results? For example...
if 'qTag' in request.GET: or_queries = request.GET['qTag'].split('&&') for or_query in or_queries: or_query_set = or_query.split() for sub_query in or_query_set: if pub_predicate: pub_predicate = pub_predicate | Q(tags__title__istartswith=sub_query) else: pub_predicate = Q(tags__title__istartswith=sub_query) pubs_for_set = Publication.objects.filter(pub_predicate).distinct() pubs_for_tags.append(pubs_for_set) pub_predicate = None pubs_for_set = NoneDoing the above gives me a list (pubs_for_tags) of lists (pubs_for_set) that gives all results for each "or"pair." But now what? I don't know how to proceed with an and search. Can anyone suggest a way to do this?
解决方案I'm not sure if there is a way to do this. I wanted to say try combining filter with Q but then chanced upon these:
Combining AND OR in Django Queries
and
AND OR in Django queries II
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