{"id":5781,"date":"2022-04-03T09:55:07","date_gmt":"2022-04-03T01:55:07","guid":{"rendered":"https:\/\/egonlin.com\/?p=5781"},"modified":"2022-04-26T14:30:23","modified_gmt":"2022-04-26T06:30:23","slug":"05-03-django%e4%b9%8b%e6%a8%a1%e5%9e%8b%e5%b1%82%e7%ac%ac%e4%b8%89%e7%af%87%ef%bc%9a%e6%9b%b4%e5%a4%9a%e5%ad%97%e6%ae%b5%e4%b8%8e%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=5781","title":{"rendered":"05-03 \u6a21\u578b\u5c42\u7b2c\u4e09\u7bc7\uff1a\u66f4\u591a\u5b57\u6bb5\u4e0e\u53c2\u6570"},"content":{"rendered":"

\u5e38\u7528\u5b57\u6bb5\u548c\u53c2\u6570<\/h1>\n

1 ORM\u5b57\u6bb5<\/h2>\n

AutoField<\/h3>\n

int\u81ea\u589e\u5217\uff0c\u5fc5\u987b\u586b\u5165\u53c2\u6570 primary_key=True\u3002\u5f53model\u4e2d\u5982\u679c\u6ca1\u6709\u81ea\u589e\u5217\uff0c\u5219\u81ea\u52a8\u4f1a\u521b\u5efa\u4e00\u4e2a\u5217\u540d\u4e3aid\u7684\u5217\u3002<\/p>\n

IntegerField<\/h3>\n

\u4e00\u4e2a\u6574\u6570\u7c7b\u578b,\u8303\u56f4\u5728 -2147483648 to 2147483647\u3002
\nCharField<\/p>\n

\u5b57\u7b26\u7c7b\u578b\uff0c\u5fc5\u987b\u63d0\u4f9bmax_length\u53c2\u6570\uff0c max_length\u8868\u793a\u5b57\u7b26\u957f\u5ea6\u3002<\/p>\n

DateField<\/h3>\n

\u65e5\u671f\u5b57\u6bb5\uff0c\u65e5\u671f\u683c\u5f0f YYYY-MM-DD\uff0c\u76f8\u5f53\u4e8ePython\u4e2d\u7684datetime.date()\u5b9e\u4f8b\u3002<\/p>\n

DateTimeField<\/h3>\n

\u65e5\u671f\u65f6\u95f4\u5b57\u6bb5\uff0c\u683c\u5f0f YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ]\uff0c\u76f8\u5f53\u4e8ePython\u4e2d\u7684datetime.datetime()\u5b9e\u4f8b
\n\u5e38\u7528\u548c\u975e\u5e38\u7528\u5b57\u6bb5<\/p>\n

  AutoField(Field)\n        - int\u81ea\u589e\u5217\uff0c\u5fc5\u987b\u586b\u5165\u53c2\u6570 primary_key=True\n\n    BigAutoField(AutoField)\n        - bigint\u81ea\u589e\u5217\uff0c\u5fc5\u987b\u586b\u5165\u53c2\u6570 primary_key=True\n\n        \u6ce8\uff1a\u5f53model\u4e2d\u5982\u679c\u6ca1\u6709\u81ea\u589e\u5217\uff0c\u5219\u81ea\u52a8\u4f1a\u521b\u5efa\u4e00\u4e2a\u5217\u540d\u4e3aid\u7684\u5217\n        from django.db import models\n\n        class UserInfo(models.Model):\n            # \u81ea\u52a8\u521b\u5efa\u4e00\u4e2a\u5217\u540d\u4e3aid\u7684\u4e14\u4e3a\u81ea\u589e\u7684\u6574\u6570\u5217\n            username = models.CharField(max_length=32)\n\n        class Group(models.Model):\n            # \u81ea\u5b9a\u4e49\u81ea\u589e\u5217\n            nid = models.AutoField(primary_key=True)\n            name = models.CharField(max_length=32)\n\n    SmallIntegerField(IntegerField):\n        - \u5c0f\u6574\u6570 -32768 \uff5e 32767\n\n    PositiveSmallIntegerField(PositiveIntegerRelDbTypeMixin, IntegerField)\n        - \u6b63\u5c0f\u6574\u6570 0 \uff5e 32767\n    IntegerField(Field)\n        - \u6574\u6570\u5217(\u6709\u7b26\u53f7\u7684) -2147483648 \uff5e 2147483647\n\n    PositiveIntegerField(PositiveIntegerRelDbTypeMixin, IntegerField)\n        - \u6b63\u6574\u6570 0 \uff5e 2147483647\n\n    BigIntegerField(IntegerField):\n        - \u957f\u6574\u578b(\u6709\u7b26\u53f7\u7684) -9223372036854775808 \uff5e 9223372036854775807\n\n    BooleanField(Field)\n        - \u5e03\u5c14\u503c\u7c7b\u578b\n\n    NullBooleanField(Field):\n        - \u53ef\u4ee5\u4e3a\u7a7a\u7684\u5e03\u5c14\u503c\n\n    CharField(Field)\n        - \u5b57\u7b26\u7c7b\u578b\n        - \u5fc5\u987b\u63d0\u4f9bmax_length\u53c2\u6570\uff0c max_length\u8868\u793a\u5b57\u7b26\u957f\u5ea6\n\n    TextField(Field)\n        - \u6587\u672c\u7c7b\u578b\n\n    EmailField(CharField)\uff1a\n        - \u5b57\u7b26\u4e32\u7c7b\u578b\uff0cDjango Admin\u4ee5\u53caModelForm\u4e2d\u63d0\u4f9b\u9a8c\u8bc1\u673a\u5236\n\n    IPAddressField(Field)\n        - \u5b57\u7b26\u4e32\u7c7b\u578b\uff0cDjango Admin\u4ee5\u53caModelForm\u4e2d\u63d0\u4f9b\u9a8c\u8bc1 IPV4 \u673a\u5236\n\n    GenericIPAddressField(Field)\n        - \u5b57\u7b26\u4e32\u7c7b\u578b\uff0cDjango Admin\u4ee5\u53caModelForm\u4e2d\u63d0\u4f9b\u9a8c\u8bc1 Ipv4\u548cIpv6\n        - \u53c2\u6570\uff1a\n            protocol\uff0c\u7528\u4e8e\u6307\u5b9aIpv4\u6216Ipv6\uff0c 'both',"ipv4","ipv6"\n            unpack_ipv4\uff0c \u5982\u679c\u6307\u5b9a\u4e3aTrue\uff0c\u5219\u8f93\u5165::ffff:192.0.2.1\u65f6\u5019\uff0c\u53ef\u89e3\u6790\u4e3a192.0.2.1\uff0c\u5f00\u542f\u6b64\u529f\u80fd\uff0c\u9700\u8981protocol="both"\n\n    URLField(CharField)\n        - \u5b57\u7b26\u4e32\u7c7b\u578b\uff0cDjango Admin\u4ee5\u53caModelForm\u4e2d\u63d0\u4f9b\u9a8c\u8bc1 URL\n\n    SlugField(CharField)\n        - \u5b57\u7b26\u4e32\u7c7b\u578b\uff0cDjango Admin\u4ee5\u53caModelForm\u4e2d\u63d0\u4f9b\u9a8c\u8bc1\u652f\u6301 \u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u3001\u8fde\u63a5\u7b26\uff08\u51cf\u53f7\uff09\n\n    CommaSeparatedIntegerField(CharField)\n        - \u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u683c\u5f0f\u5fc5\u987b\u4e3a\u9017\u53f7\u5206\u5272\u7684\u6570\u5b57\n\n    UUIDField(Field)\n        - \u5b57\u7b26\u4e32\u7c7b\u578b\uff0cDjango Admin\u4ee5\u53caModelForm\u4e2d\u63d0\u4f9b\u5bf9UUID\u683c\u5f0f\u7684\u9a8c\u8bc1\n\n    FilePathField(Field)\n        - \u5b57\u7b26\u4e32\uff0cDjango Admin\u4ee5\u53caModelForm\u4e2d\u63d0\u4f9b\u8bfb\u53d6\u6587\u4ef6\u5939\u4e0b\u6587\u4ef6\u7684\u529f\u80fd\n        - \u53c2\u6570\uff1a\n                path,                      \u6587\u4ef6\u5939\u8def\u5f84\n                match=None,                \u6b63\u5219\u5339\u914d\n                recursive=False,           \u9012\u5f52\u4e0b\u9762\u7684\u6587\u4ef6\u5939\n                allow_files=True,          \u5141\u8bb8\u6587\u4ef6\n                allow_folders=False,       \u5141\u8bb8\u6587\u4ef6\u5939\n\n    FileField(Field)\n        - \u5b57\u7b26\u4e32\uff0c\u8def\u5f84\u4fdd\u5b58\u5728\u6570\u636e\u5e93\uff0c\u6587\u4ef6\u4e0a\u4f20\u5230\u6307\u5b9a\u76ee\u5f55\n        - \u53c2\u6570\uff1a\n            upload_to = ""      \u4e0a\u4f20\u6587\u4ef6\u7684\u4fdd\u5b58\u8def\u5f84\n            storage = None      \u5b58\u50a8\u7ec4\u4ef6\uff0c\u9ed8\u8ba4django.core.files.storage.FileSystemStorage\n\n    ImageField(FileField)\n        - \u5b57\u7b26\u4e32\uff0c\u8def\u5f84\u4fdd\u5b58\u5728\u6570\u636e\u5e93\uff0c\u6587\u4ef6\u4e0a\u4f20\u5230\u6307\u5b9a\u76ee\u5f55\n        - \u53c2\u6570\uff1a\n            upload_to = ""      \u4e0a\u4f20\u6587\u4ef6\u7684\u4fdd\u5b58\u8def\u5f84\n            storage = None      \u5b58\u50a8\u7ec4\u4ef6\uff0c\u9ed8\u8ba4django.core.files.storage.FileSystemStorage\n            width_field=None,   \u4e0a\u4f20\u56fe\u7247\u7684\u9ad8\u5ea6\u4fdd\u5b58\u7684\u6570\u636e\u5e93\u5b57\u6bb5\u540d\uff08\u5b57\u7b26\u4e32\uff09\n            height_field=None   \u4e0a\u4f20\u56fe\u7247\u7684\u5bbd\u5ea6\u4fdd\u5b58\u7684\u6570\u636e\u5e93\u5b57\u6bb5\u540d\uff08\u5b57\u7b26\u4e32\uff09\n\n    DateTimeField(DateField)\n        - \u65e5\u671f+\u65f6\u95f4\u683c\u5f0f YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ]\n\n    DateField(DateTimeCheckMixin, Field)\n        - \u65e5\u671f\u683c\u5f0f      YYYY-MM-DD\n\n    TimeField(DateTimeCheckMixin, Field)\n        - \u65f6\u95f4\u683c\u5f0f      HH:MM[:ss[.uuuuuu]]\n\n    DurationField(Field)\n        - \u957f\u6574\u6570\uff0c\u65f6\u95f4\u95f4\u9694\uff0c\u6570\u636e\u5e93\u4e2d\u6309\u7167bigint\u5b58\u50a8\uff0cORM\u4e2d\u83b7\u53d6\u7684\u503c\u4e3adatetime.timedelta\u7c7b\u578b\n\n    FloatField(Field)\n        - \u6d6e\u70b9\u578b\n\n    DecimalField(Field)\n        - 10\u8fdb\u5236\u5c0f\u6570\n        - \u53c2\u6570\uff1a\n            max_digits\uff0c\u5c0f\u6570\u603b\u957f\u5ea6\n            decimal_places\uff0c\u5c0f\u6570\u4f4d\u957f\u5ea6\n\n    BinaryField(Field)\n        - \u4e8c\u8fdb\u5236\u7c7b\u578b\n<\/code><\/pre>\n
\u5bf9\u5e94\u5173\u7cfb\uff1a\n    'AutoField': 'integer AUTO_INCREMENT',\n    'BigAutoField': 'bigint AUTO_INCREMENT',\n    'BinaryField': 'longblob',\n    'BooleanField': 'bool',\n    'CharField': 'varchar(%(max_length)s)',\n    'CommaSeparatedIntegerField': 'varchar(%(max_length)s)',\n    'DateField': 'date',\n    'DateTimeField': 'datetime',\n    'DecimalField': 'numeric(%(max_digits)s, %(decimal_places)s)',\n    'DurationField': 'bigint',\n    'FileField': 'varchar(%(max_length)s)',\n    'FilePathField': 'varchar(%(max_length)s)',\n    'FloatField': 'double precision',\n    'IntegerField': 'integer',\n    'BigIntegerField': 'bigint',\n    'IPAddressField': 'char(15)',\n    'GenericIPAddressField': 'char(39)',\n    'NullBooleanField': 'bool',\n    'OneToOneField': 'integer',\n    'PositiveIntegerField': 'integer UNSIGNED',\n    'PositiveSmallIntegerField': 'smallint UNSIGNED',\n    'SlugField': 'varchar(%(max_length)s)',\n    'SmallIntegerField': 'smallint',\n    'TextField': 'longtext',\n    'TimeField': 'time',\n    'UUIDField': 'char(32)',<\/code><\/pre>\n
2 ORM\u5b57\u6bb5\u53c2\u6570<\/h2>\n
null<\/h3>\n
\u7528\u4e8e\u8868\u793a\u67d0\u4e2a\u5b57\u6bb5\u53ef\u4ee5\u4e3a\u7a7a\u3002<\/p>\n
unique<\/h3>\n
\u5982\u679c\u8bbe\u7f6e\u4e3aunique=True \u5219\u8be5\u5b57\u6bb5\u5728\u6b64\u8868\u4e2d\u5fc5\u987b\u662f\u552f\u4e00\u7684 \u3002<\/p>\n
db_index<\/h3>\n
\u5982\u679cdb_index=True \u5219\u4ee3\u8868\u7740\u4e3a\u6b64\u5b57\u6bb5\u8bbe\u7f6e\u7d22\u5f15\u3002<\/p>\n
default<\/h3>\n
\u4e3a\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u9ed8\u8ba4\u503c\u3002<\/p>\n
DateField\u548cDateTimeField<\/h2>\n
auto_now_add<\/h3>\n
\u914d\u7f6eauto_now_add=True\uff0c\u521b\u5efa\u6570\u636e\u8bb0\u5f55\u7684\u65f6\u5019\u4f1a\u628a\u5f53\u524d\u65f6\u95f4\u6dfb\u52a0\u5230\u6570\u636e\u5e93\u3002<\/p>\n
auto_now<\/h3>\n
\u914d\u7f6e\u4e0aauto_now=True\uff0c\u6bcf\u6b21\u66f4\u65b0\u6570\u636e\u8bb0\u5f55\u7684\u65f6\u5019\u4f1a\u66f4\u65b0\u8be5\u5b57\u6bb5\u3002<\/p>\n
null                \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u662f\u5426\u53ef\u4ee5\u4e3a\u7a7a\n    db_column           \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u7684\u5217\u540d\n    db_tablespace\n    default             \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u7684\u9ed8\u8ba4\u503c\n    primary_key         \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u662f\u5426\u4e3a\u4e3b\u952e\n    db_index            \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u662f\u5426\u53ef\u4ee5\u5efa\u7acb\u7d22\u5f15\n    unique              \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u662f\u5426\u53ef\u4ee5\u5efa\u7acb\u552f\u4e00\u7d22\u5f15\n    unique_for_date     \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u3010\u65e5\u671f\u3011\u90e8\u5206\u662f\u5426\u53ef\u4ee5\u5efa\u7acb\u552f\u4e00\u7d22\u5f15\n    unique_for_month    \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u3010\u6708\u3011\u90e8\u5206\u662f\u5426\u53ef\u4ee5\u5efa\u7acb\u552f\u4e00\u7d22\u5f15\n    unique_for_year     \u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u3010\u5e74\u3011\u90e8\u5206\u662f\u5426\u53ef\u4ee5\u5efa\u7acb\u552f\u4e00\u7d22\u5f15\n\n    verbose_name        Admin\u4e2d\u663e\u793a\u7684\u5b57\u6bb5\u540d\u79f0\n    blank               Admin\u4e2d\u662f\u5426\u5141\u8bb8\u7528\u6237\u8f93\u5165\u4e3a\u7a7a\n    editable            Admin\u4e2d\u662f\u5426\u53ef\u4ee5\u7f16\u8f91\n    help_text           Admin\u4e2d\u8be5\u5b57\u6bb5\u7684\u63d0\u793a\u4fe1\u606f\n    choices             Admin\u4e2d\u663e\u793a\u9009\u62e9\u6846\u7684\u5185\u5bb9\uff0c\u7528\u4e0d\u53d8\u52a8\u7684\u6570\u636e\u653e\u5728\u5185\u5b58\u4e2d\u4ece\u800c\u907f\u514d\u8de8\u8868\u64cd\u4f5c\n                        \u5982\uff1agf = models.IntegerField(choices=[(0, '\u4f55\u7a57'),(1, '\u5927\u8868\u59d0'),],default=1)\n\n    error_messages      \u81ea\u5b9a\u4e49\u9519\u8bef\u4fe1\u606f\uff08\u5b57\u5178\u7c7b\u578b\uff09\uff0c\u4ece\u800c\u5b9a\u5236\u60f3\u8981\u663e\u793a\u7684\u9519\u8bef\u4fe1\u606f\uff1b\n                        \u5b57\u5178\u5065\uff1anull, blank, invalid, invalid_choice, unique, and unique_for_date\n                        \u5982\uff1a{'null': "\u4e0d\u80fd\u4e3a\u7a7a.", 'invalid': '\u683c\u5f0f\u9519\u8bef'}\n\n    validators          \u81ea\u5b9a\u4e49\u9519\u8bef\u9a8c\u8bc1\uff08\u5217\u8868\u7c7b\u578b\uff09\uff0c\u4ece\u800c\u5b9a\u5236\u60f3\u8981\u7684\u9a8c\u8bc1\u89c4\u5219\n                        from django.core.validators import RegexValidator\n                        from django.core.validators import EmailValidator,URLValidator,DecimalValidator,\\\n                        MaxLengthValidator,MinLengthValidator,MaxValueValidator,MinValueValidator\n                        \u5982\uff1a\n                            test = models.CharField(\n                                max_length=32,\n                                error_messages={\n                                    'c1': '\u4f18\u5148\u9519\u4fe1\u606f1',\n                                    'c2': '\u4f18\u5148\u9519\u4fe1\u606f2',\n                                    'c3': '\u4f18\u5148\u9519\u4fe1\u606f3',\n                                },\n                                validators=[\n                                    RegexValidator(regex='root_\\d+', message='\u9519\u8bef\u4e86', code='c1'),\n                                    RegexValidator(regex='root_112233\\d+', message='\u53c8\u9519\u8bef\u4e86', code='c2'),\n                                    EmailValidator(message='\u53c8\u9519\u8bef\u4e86', code='c3'), ]\n                            )<\/code><\/pre>\n
3 \u5173\u7cfb\u5b57\u6bb5<\/h2>\n
ForeignKey<\/h3>\n
\u5916\u952e\u7c7b\u578b\u5728ORM\u4e2d\u7528\u6765\u8868\u793a\u5916\u952e\u5173\u8054\u5173\u7cfb\uff0c\u4e00\u822c\u628aForeignKey\u5b57\u6bb5\u8bbe\u7f6e\u5728 ‘\u4e00\u5bf9\u591a’\u4e2d’\u591a’\u7684\u4e00\u65b9\u3002<\/p>\n
ForeignKey\u53ef\u4ee5\u548c\u5176\u4ed6\u8868\u505a\u5173\u8054\u5173\u7cfb\u540c\u65f6\u4e5f\u53ef\u4ee5\u548c\u81ea\u8eab\u505a\u5173\u8054\u5173\u7cfb\u3002<\/p>\n
to<\/h3>\n
\u8bbe\u7f6e\u8981\u5173\u8054\u7684\u8868<\/p>\n
to_field<\/h3>\n
\u8bbe\u7f6e\u8981\u5173\u8054\u7684\u8868\u7684\u5b57\u6bb5<\/p>\n
related_name<\/h3>\n
\u53cd\u5411\u64cd\u4f5c\u65f6\uff0c\u4f7f\u7528\u7684\u5b57\u6bb5\u540d\uff0c\u7528\u4e8e\u4ee3\u66ff\u539f\u53cd\u5411\u67e5\u8be2\u65f6\u7684’\u8868\u540d_set’\u3002<\/p>\n
\u4f8b\u5982\uff1a<\/p>\n
class Classes(models.Model):\n    name = models.CharField(max_length=32)\n\nclass Student(models.Model):\n    name = models.CharField(max_length=32)\n    theclass = models.ForeignKey(to="Classes")<\/code><\/pre>\n
\u5f53\u6211\u4eec\u8981\u67e5\u8be2\u67d0\u4e2a\u73ed\u7ea7\u5173\u8054\u7684\u6240\u6709\u5b66\u751f\uff08\u53cd\u5411\u67e5\u8be2\uff09\u65f6\uff0c\u6211\u4eec\u4f1a\u8fd9\u4e48\u5199\uff1a<\/p>\n
models.Classes.objects.first().student_set.all()<\/code><\/pre>\n
\u5f53\u6211\u4eec\u5728ForeignKey\u5b57\u6bb5\u4e2d\u6dfb\u52a0\u4e86\u53c2\u6570 related_name \u540e\uff0c<\/p>\n
class Student(models.Model):<\/p>\n
    name = models.CharField(max_length=32)\n    theclass = models.ForeignKey(to="Classes", related_name="students")<\/code><\/pre>\n
\u5f53\u6211\u4eec\u8981\u67e5\u8be2\u67d0\u4e2a\u73ed\u7ea7\u5173\u8054\u7684\u6240\u6709\u5b66\u751f\uff08\u53cd\u5411\u67e5\u8be2\uff09\u65f6\uff0c\u6211\u4eec\u4f1a\u8fd9\u4e48\u5199\uff1a<\/p>\n
models.Classes.objects.first().students.all()<\/code><\/pre>\n
related_query_name<\/h3>\n
\u53cd\u5411\u67e5\u8be2\u64cd\u4f5c\u65f6\uff0c\u4f7f\u7528\u7684\u8fde\u63a5\u524d\u7f00\uff0c\u7528\u4e8e\u66ff\u6362\u8868\u540d\u3002<\/p>\n
on_delete<\/h3>\n
\u3000\u3000\u5f53\u5220\u9664\u5173\u8054\u8868\u4e2d\u7684\u6570\u636e\u65f6\uff0c\u5f53\u524d\u8868\u4e0e\u5176\u5173\u8054\u7684\u884c\u7684\u884c\u4e3a\u3002<\/p>\n
\u3000\u3000models.CASCADE
\n\u3000\u3000\u5220\u9664\u5173\u8054\u6570\u636e\uff0c\u4e0e\u4e4b\u5173\u8054\u4e5f\u5220\u9664<\/p>\n
\u3000\u3000models.DO_NOTHING
\n\u3000\u3000\u5220\u9664\u5173\u8054\u6570\u636e\uff0c\u5f15\u53d1\u9519\u8befIntegrityError<\/p>\n
\u3000\u3000models.PROTECT
\n\u3000\u3000\u5220\u9664\u5173\u8054\u6570\u636e\uff0c\u5f15\u53d1\u9519\u8befProtectedError<\/p>\n
\u3000\u3000models.SET_NULL
\n\u3000\u3000\u5220\u9664\u5173\u8054\u6570\u636e\uff0c\u4e0e\u4e4b\u5173\u8054\u7684\u503c\u8bbe\u7f6e\u4e3anull\uff08\u524d\u63d0FK\u5b57\u6bb5\u9700\u8981\u8bbe\u7f6e\u4e3a\u53ef\u7a7a\uff09<\/p>\n
\u3000\u3000models.SET_DEFAULT
\n\u3000\u3000\u5220\u9664\u5173\u8054\u6570\u636e\uff0c\u4e0e\u4e4b\u5173\u8054\u7684\u503c\u8bbe\u7f6e\u4e3a\u9ed8\u8ba4\u503c\uff08\u524d\u63d0FK\u5b57\u6bb5\u9700\u8981\u8bbe\u7f6e\u9ed8\u8ba4\u503c\uff09<\/p>\n
\u3000\u3000models.SET<\/p>\n
\u3000\u3000\u5220\u9664\u5173\u8054\u6570\u636e\uff0c
\n\u3000\u3000a. \u4e0e\u4e4b\u5173\u8054\u7684\u503c\u8bbe\u7f6e\u4e3a\u6307\u5b9a\u503c\uff0c\u8bbe\u7f6e\uff1amodels.SET(\u503c)
\n\u3000\u3000b. \u4e0e\u4e4b\u5173\u8054\u7684\u503c\u8bbe\u7f6e\u4e3a\u53ef\u6267\u884c\u5bf9\u8c61\u7684\u8fd4\u56de\u503c\uff0c\u8bbe\u7f6e\uff1amodels.SET(\u53ef\u6267\u884c\u5bf9\u8c61)<\/p>\n
def func():\n    return 10\n\nclass MyModel(models.Model):\n    user = models.ForeignKey(\n        to="User",\n        to_field="id"\uff0c\n        on_delete=models.SET(func)\n    )<\/code><\/pre>\n
<\/div>
\u67e5\u770b\u66f4\u591a<\/h2>
\u8054\u7cfb\u7ba1\u7406\u5458\u5fae\u4fe1tutu19192010\uff0c\u6ce8\u518c\u8d26\u53f7<\/p>\n<\/div>
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\u5e38\u7528\u5b57\u6bb5\u548c\u53c2\u6570 1 ORM\u5b57\u6bb5 AutoField int\u81ea\u589e\u5217\uff0c\u5fc5\u987b\u586b\u5165\u53c2\u6570 primary_key=Tru […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[385,389],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/5781"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5781"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/5781\/revisions"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5781"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5781"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5781"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}