两列串联后的Django queryset过滤器

问题描述

是否可以使用两个列的串联来过滤模型？我的模型是这样的：

Is there any way to filter a model using a concatenation of two of its columns? My model is like this:

class Item(models.Model):
    series = models.CharField(max_length=50)
    number = models.CharField(max_length=50)

我需要的是两列连接后进行过滤，如果用户输入A123，我希望能够找到具有系列和数字的任何项，例如％A和123％或％A1和23％
使用django是否可以楷模？还是有可能使用原始sql？
我宁愿不使用连接来构造新列。

What I need is to filter after the concatenation of the two columns, if a user inputs A123 I want to be able to find any Item that has series and number like %A and 123% or %A1 and 23%Is this possible using the django models? Or is it possible with raw sql?I would rather not construct a new column with the concatenation.

推荐答案

是的，这是可能的。您将需要用字段的串联来注释 QuerySet，并且新的虚拟列将能够进行过滤。

Yes that is possible; you will need to annotate the QuerySet with the concatenation of the fields, and that new "virtual" column will be capable of filtering.

using Concat as an annotation function

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