Python函数更新（）无法识别

Question

def updateTheme(self, id, new_theme):
    theme = Theme.query.filter_by(id = id).first()
    theme.update(new_theme)
    db.session.commit()

错误：“主题”对象没有属性“更新”
它应该是这样工作的：

theme = Theme(name = "osman")
new_theme = Theme(name = "miras")
theme.update(new_theme)
print(theme) # osman have to be changed to miras

即使我可以这样做：

theme.name = "miras"

当我必须使用多个参数时，例如姓名、姓氏、电话。此外，updateTheme 并不总是提供所有参数（姓名、姓氏、电话），它应该只更新提供的参数。例如：

person = {name: "john", surname: "smith", phone: 12345, country: "USA"}
update_person = {country: "Portugal"}
person.update(update_person) # should change only country

Answer 1

如果您想更新一两个字段，您可以使用：

theme = Theme(name = "osman")
new_theme = Theme(name = "miras")
theme.name=new_theme.name
db.session.commit()
print(theme) # osman will change to miras

如果要更新更多字段：

dict_to_update = {'name': new_theme.name}
updated_theme = Theme.query.filter_by(name="miras").update(dict_to_update)
db.session.commit()
print(theme) # osman will change to miras