Considerations regarding model’serror_messages¶

Error messages defined at theformfieldlevel or at theform Metalevel always take precedence over the error messages defined at themodelfieldlevel.

Error messages defined onmodelfieldsare only used when theValidationErroris raised during themodel validation

#您可以通過將NON_FIELD_ERRORS鍵新增到ModelForm的內部Meta類的error_messages字典中來覆蓋模型驗證所引起的NON_FIELD_ERRORS錯誤訊息：

You can override the error messages fromNON_FIELD_ERRORSraised by model validation by adding theNON_FIELD_ERRORSkey to theerror_messages

from django.core.exceptions import NON_FIELD_ERRORS
from django.forms import ModelForm

class ArticleForm(ModelForm):
    class Meta:
        error_messages = {
            NON_FIELD_ERRORS: {
                'unique_together': "%(model_name)s's %(field_labels)s are not unique.",
            }
        }