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django.db.models.fields.related_descriptors.RelatedObjectDoesNotExist: Course has no coursedetail.

错误描述: 一对一反向查询失败! 前提: Course和CourseDetail    OneToOne 原因: Course数据和CourseDetail数据没有一一对应.…

django.db.models.fields.related_descriptors.RelatedObjectDoesNotExist

Enrollment has no customer.…

django - from django.db.models import F - class F

F() 的执行不经过 python解释器,不经过本机内存,是生成 SQL语句的执行. # Tintin filed a news story! reporter = Reporters.objects.get(name='Tintin') reporter.stories_filed += 1 reporter.save() # 等于 from django.db.models import F reporter = Reporters.objects.get(name='Tintin') re…

Django | Unable to get repr for <class 'django.db.models.query.QuerySet'>

问题:在mysql中查询数据时,代码如下: skus = category.sku_set.filter(is_launched=True).order_by(sort_field) skus 取不到数据,提示 skus: Unable to get repr for <class 'django.db.models.query.QuerySet'> 解决: 多方查找,是因为,原模型类中的 default_image_url = models.CharField(max_length=200,…

Python 报错 AttributeError: module 'django.db.models' has no attribute 'SubfieldBase'

AttributeError: module 'django.db.models' has no attribute 'SubfieldBase' http://www.guanggua.com/question/35166085-How-to-deal-with-SubfieldBase-has-been-deprecated-Use-Fieldfrom_db_value-instead.html 说的很详细,后期会整理…

在执行migrate的时候出现问题（错误见末尾）： django.db.utils.OperationalError: (1045, "Access denied for user ‘ODBC‘@‘localho st‘ (using password: YES)")

Python框架之Django的数据库 在执行migrate的时候出现问题(错误见末尾) django.db.utils.OperationalError: (1045, "Access denied for user ‘ODBC‘@‘localho st‘ (using password: YES)") :   Unhandled exception in thread started by <function check_errors.<locals>.wrapp…

【Django】--Models 和ORM以及admin配置

Models 数据库的配置 1    django默认支持sqlite,mysql, oracle,postgresql数据库 <1>sqlite django默认使用sqlite的数据库,默认自带sqlite的数据库驱动 引擎名称:django.db.backends.sqlite3 <2>mysql 引擎名称:django.db.backends.mysql 2    mysql驱动程序 MySQLdb(mysql python) mysqlclient MySQL PyMyS…

#module-django.db.models

Models A model is the single, definitive source of information about your data. It contains the essential fields and behaviors of the data you're storing. Generally, each model maps to a single database table. The basics: Each model is a Python class…

Django的Models(三)

ORM操作的一些进阶的方法: ################################################################## # PUBLIC METHODS THAT ALTER ATTRIBUTES AND RETURN A NEW QUERYSET # ################################################################## def all(self) # 获取所有的数据对象 def filt…

django.db.utils.DataError: (1406, "Data too long for column 'gender' at row 1")

报错现象 在使用 django 创建 超级用户的时候提示报错 Password (again): ytyt521521 Traceback (most recent call last): File "C:\Users\Python\Envs\testvir2\lib\site-packages\django\db\backends\utils.py", line 64, in execute return self.cursor.execute(sql, params) File &…