python - 如何覆盖第 3 方安装的应用程序 django 的模型默认方法？

Question

我刚刚安装了this django-csvimport package 。现在我想覆盖管理区域表单中的默认值。我找到了code here ，它定义模型，并包含当前的默认文本:

class CSVImport(models.Model):
    """ Logging model for importing files """
    model_choice = []
    model_name = models.CharField(max_length=255, blank=False,
                                  default='csvimport.Item',
                                  help_text='Please specify the app_label.model_name',
                                  choices=get_models())
    field_list = models.TextField(blank=True,
                                  help_text='''Enter list of fields in order only if
                                     you dont have a header row with matching field names, eg.
                                     "column1=shared_code,column2=org(Organisation|name)"''')
    upload_file = models.FileField(upload_to='csv', storage=fs)
    file_name = models.CharField(max_length=255, blank=True)
    encoding = models.CharField(max_length=32, blank=True)
    upload_method = models.CharField(blank=False, max_length=50,
                                     default='manual', choices=CHOICES)
    error_log = models.TextField(help_text='Each line is an import error')
    import_date = models.DateField(auto_now=True)
    import_user = models.CharField(max_length=255, default='anonymous',
                                   help_text='User id as text', blank=True)

    def error_log_html(self):
        return re.sub('\n', '<br/>', self.error_log)
    error_log_html.allow_tags = True

    def __unicode__(self):
        return self.upload_file.name

例如，我想用其他内容覆盖 model_name 字段默认 csvimport.Item 。我有点不知所措，因为我没有用于 csvimport 的应用程序文件夹，因为它是第三部分安装。这将是我第一次覆盖第三方安装的应用程序模型。

现在我更深入地研究了它，不确定是否应该重写此模型，或者更好地使用 admin.py 文件的 ModelAdmin 类？

谢谢!

Answer 1

"""Your admin.py"""

from csvimport.models import CSVImport
from csvimport.admin import CSVImportAdmin

class MyCSVImportAdmin(CSVImportAdmin):
    """Override some of the form's field properties:
       clean, creation_counter, default_error_messages, 
       default_validators, disabled, empty_value, empty_values .. etc
    """

    def get_form(self, request, obj=None, **kwargs):
        form = super(MyCSVImportAdmin, self).get_form(request, obj, **kwargs)
        form.base_fields["model_name"].initial = 'What you want'
        form.base_fields["model_name"].help_text = 'Please customize the fields however you like'
        return form

admin.site.unregister(CSVImport)
admin.site.register(CSVImport, MyCSVImportAdmin)