[英]How to insert element into a field with django
What would be the best way to insert a variable into a field in django, similar to insert element into a list in python. 将变量插入django中的字段的最佳方法是什么,类似于将元素插入python中的列表的最佳方法。
I am not trying to update a record field "first_name" in the database but rather "insert" or "add" a second "first_name" from someone else in the database that share the same last name. 我不是要更新数据库中的记录字段“ first_name”,而是要从数据库中共享相同姓氏的其他人“插入”或“添加”第二个“ first_name”。
Ex: 例如:
First Name Last Name
Alan Smith
Eric Jones
Inna Smith
Result: 结果:
First Name Last Name
Alan, Inna Smith, Smith
Eric Jones
I am using PostgreSQL as database. 我正在使用PostgreSQL作为数据库。
Any help would be much appreciated. 任何帮助将非常感激。 Thank you. 谢谢。
This is what I came up with. 这就是我想出的。 Hope it helps. 希望能帮助到你。
to_delete = []
for person in Person.objects.all():
# all people sharing a last name with person
matches = Person.objects.filter(last_name=person.last_name)
# a list with the first names
first_names = matches.values_list('first_name', flat=True)
# a list with the last names
last_names = matches.values_list('last_name', flat=True)
# Join them with comma as a separator e.g 'Alan, Inna'
joined_fnames = ', '.join(first_names)
joined_lnames = ', '.join(last_names)
# set the new joined strings as persons new values
person.first_name = joined_fnames
person.last_name = joined_lnames
# get the other record ids that have already been joined into person and add to to_delete
ids = matches.exclude(id=person.id).values_list('id', flat=True)
to_delete += ids
person.save()
# finally delete all records in to_delete
Person.objects.filter(id__in=to_delete).delete()
您可以尝试使用ArrayField 链接
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