对于django错误FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, query))的解决

报错的原因

"FieldDoesNotExist" 这个错误通常是因为你在 Django 模型中使用了不存在的字段名称导致的。

具体来说，在这个错误中，你尝试使用了一个名为 `query` 的字段，但是你的模型并没有这个字段。因此，Django 会抛出 "FieldDoesNotExist" 错误，提示你这个模型没有这个字段。

要解决这个错误，你需要检查你的代码，确保你使用的是正确的字段名称。

例如，如果你有一个名为 `Person` 的模型，其中包含名为 `name` 和 `age` 的字段，你可以使用以下代码来查询数据库：

Person.objects.filter(name='John')

如果你使用了错误的字段名称，例如 `namee`，就会出现 "FieldDoesNotExist" 错误。

Person.objects.filter(namee='John')  # 错误：FieldDoesNotEx

如果你确保了使用了正确的字段名称，但仍然遇到了 "FieldDoesNotExist" 错误，还有一个可能的原因是你的数据库中并没有这个字段。

例如，如果你在你的模型中添加了一个新字段，但没有在数据库中运行迁移脚本，就会出现 "FieldDoesNotExist" 错误。

要解决这个问题，你需要在数据库中运行迁移脚本，以便更新数据库结构。

例如，你可以使用以下命令来运行迁移脚本：

python manage.py makemigrations
python manage.py migrate

这样，你的数据库就会更新为包含所有模型中定义的字段。

I'm sorry, but I'm not sure how to continue without a specific question or topic to discuss. Could you please ask a specific question or provide more information about what you would like to know? I'll do my best to help.

如何解决

To resolve the "FieldDoesNotExist" error, you need to make sure that you are using the correct field names in your Django model. This means checking your code and ensuring that you are using the correct field names in your queries and filters.

For example, if you have a model called `Person` with fields `name` and `age`, you can use the following code to query the database:

Person.objects.filter(name='John')

If you use an incorrect field name, such as `namee`, you will get a "FieldDoesNotExist" error:

Person.objects.filter(namee='John')  # Error: FieldDoesNotExist

If you are sure that you are using the correct field names, but are still getting the "FieldDoesNotExist" error, it is possible that the field does not exist in your database. This could happen if you have added a new field to your model, but have not run the database migration scripts to update the database structure.

To resolve this issue, you will need to run the migration scripts to update the database to include the new field. You can do this using the following commands:

python manage.py makemigrations
python manage.py migrate

This will update the database to include all fields defined in your models.

I hope this helps to resolve the "FieldDoesNotExist" error. If you have any further questions, please don't hesitate to ask.

使用例子

Yes, here is an example of how to use Django to query a database and avoid the "FieldDoesNotExist" error.

Assume that you have a model called `Person` with fields `name` and `age`. You can use the following code to query the database for all people with the name "John":

from django.db.models import Q

people = Person.objects.filter(Q(name='John'))

for person in people:
    print(person.name, person.age)

This will output the name and age of all people with the name "John".

If you try to use an incorrect field name, such as `namee`, you will get a "FieldDoesNotExist" error:

people = Person.objects.filter(Q(namee='John'))  # Error: FieldDoesNotExist

To avoid this error, make sure to use the correct field names in your queries and filters.

I hope this example helps. If you have any further questions, please don't hesitate to ask.