I'm not sure how to go about displaying the fields for the foreign key relationships in a form. I know in a view you can use document.code_set (for example) to access the related objects for the currentdocumentobject, but I'm not sure how to apply this to a ModelForm. My model: ...
1.迁移先需要失败一次(既然出现了这个错误,说明已经迁移了一次) 2.修改当前表外键字段的字符集(或者说COLLATE),修改为外键关联表的字符集 查看表的创建语句(主要是查看外键关联表主键的字符集) SHOWCREATETABLE`user_group` (查看创建表的命令) 修改字符集 ALTERTABLEuser_group_info MODIFY employee_idVARCHAR(30)...
migrations.AddField( model_name='platformenv', name='tag_type', field=models.ForeignKey(blank=True, db_column='Tag_Type', null=True, on_delete=django.db.models.deletion.DO_NOTHING, to='polls.Tagtypes'), ), The DB shows the following error: Error in foreign key constraint of table ad...
概述:Admin autocomplete field doesn't support the 'to_field' on Foreign Keys→Add ModelAdmin.autocomplete_fields support for ForeignKeys that use to_field I think the correct solution is to modifyAutocompleteJsonViewto return theto_fieldvalue instead of the primary key. To prevent improper data ...
总结 解决django.db.utils.OperationalError: (1822, "Failed to add the foreign key constraint...") 错误的关键在于确保外键约束引用的字段已经建立了索引,并且关联的表存在且数据类型匹配。通过仔细检查和调整数据库模型及迁移文件,你应该能够解决这个问题。
如果在使用Django Admin后台添加用户时出现报错: django.db.utils.IntegrityError: (1452, 'Cannot add or update a child row: a foreign key constraint fails (`mxonline`.`django_admin_log`, CONSTRAINT `django_admin_log_user_id_c564eba6_fk_auth_user_id` FOREIGN KEY (`user_id`) REFERENCES `auth...
django.db.utils.IntegrityError: (1215, 'Cannot add foreign key constraint') From what I've read about MySQL constraints this is caused by the different field types. Changing the type of the original field doesn't change the type of the foreign key field and the constraint cannot be re-add...
今天在数据迁移的时候,一直报错 Cannot add foreign key constraint 产生这个错误的多数原因有以下几点: 1,两张表里要设主键和外键的字段的数据类型或者数据长度不一样 (例如这个是int 另外一个是tinyint,或者都是int,但是设置的长度不同) 2,某个表里已经有记录了 ...
This new version requires django-filer. When I run the migrations, the initial migration generates an error: (0.667) ALTER TABLE `filer_folder` ADD CONSTRAINT `filer_folder_owner_id_be530fb4_fk_auth_user_id` FOREIGN KEY (`owner_id`) REFERENCES `auth_user` (`id`); args=[] Traceback ...
This new version requires django-filer. When I run the migrations, the initial migration generates an error: (0.667) ALTER TABLE `filer_folder` ADD CONSTRAINT `filer_folder_owner_id_be530fb4_fk_auth_user_id` FOREIGN KEY (`owner_id`) REFERENCES `auth_user` (`id`); args=[] Traceback ...