{"id":743,"date":"2017-04-27T19:52:31","date_gmt":"2017-04-27T11:52:31","guid":{"rendered":"http:\/\/192.168.1.20\/?p=743"},"modified":"2017-10-23T11:52:47","modified_gmt":"2017-10-23T03:52:47","slug":"django{d4daabd1ba368d9860c36387ddb72bbda14f8f9559d69d60a952800885260c03}e4{d4daabd1ba368d9860c36387ddb72bbda14f8f9559d69d60a952800885260c03}b8{47dd41ec6bdcbd9a214c783a3735392b82ea6d1d918378c5a53e06407","status":"publish","type":"post","link":"http:\/\/alextop.top\/?p=743","title":{"rendered":"django\u4e2dmodels field\u8be6\u89e3"},"content":{"rendered":"

\u672c\u6587\u53c2\u8003\u81ea\uff1a<\/span>django<\/span>\u5b98\u65b9\u6587\u6863<\/span><\/span>models\/field<\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u5728<\/span>model<\/span>\u4e2d\u6dfb\u52a0\u5b57\u6bb5\u7684\u683c\u5f0f\u4e00\u822c\u4e3a\uff1a<\/span><\/span>\u00a0 field_name = field_type(**field_options)<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u00a0
\n\u00a0<\/p>\n

\u4e00<\/span>\u00a0 field options(<\/span>\u6240\u6709\u5b57\u6bb5\u5171\u7528<\/span><\/strong><\/span>)<\/strong><\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>1\u00a0 null\u00a0\u00a0 <\/span>\u9ed8\u8ba4\u4e3a<\/span>False<\/span>\uff0c<\/span>True<\/span>\u5219\u8868\u793a\u53ef\u4ee5\u4e3a<\/span>null<\/span>\u3002\uff08\u7a7a\u5b57\u7b26\u4e32\u5728\u6570\u636e\u5e93\u4e2d\u53ef\u80fd\u88ab\u5b58\u50a8\u4e3a<\/span>”<\/span>\uff09<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>2\u00a0 blank\u00a0 <\/span>\u9ed8\u8ba4\u4e3a<\/span>False<\/span>\uff0c<\/span>True<\/span>\u8868\u793a\u53ef\u4ee5\u4e3a\u7a7a\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>3\u00a0 choice\u00a0 <\/span>\u53ef\u9009\u7684\uff0c\u9650\u5236\u4e86\u8be5\u9009\u9879\u7684\u5b57\u6bb5\u503c\u5fc5\u987b\u662f\u6240\u6307\u5b9a\u7684<\/span>choice<\/span>\u4e2d\u7684\u4e00\u4e2a\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\"\"\/\"\"\/
\n\t\t<\/span><\/p>\n

from django.db import models
\n<\/span><\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

class Student(models.Model):
\n<\/span><\/span><\/p>\n

FRESHMAN = ‘FR’
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

SOPHOMORE = ‘SO’
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

JUNIOR = ‘JR’
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

SENIOR = ‘SR’
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

YEAR_IN_SCHOOL_CHOICES = (
\n<\/span><\/p>\n

(FRESHMAN, ‘Freshman’), #<\/span><\/span><\/span><\/span>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u771f\u6b63\u7684<\/span>model<\/span>\u53c2\u6570\uff0c<\/span>#<\/span>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5219\u662f\u65b9\u4fbf\u4eba\u4eec\u7406\u89e3\u9605\u8bfb<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

(SOPHOMORE, ‘Sophomore’),
\n<\/span><\/span><\/span><\/p>\n

(JUNIOR, ‘Junior’),
\n<\/span><\/span><\/span><\/p>\n

(SENIOR, ‘Senior’),
\n<\/span><\/span><\/span><\/p>\n

)
\n<\/span><\/p>\n

year_in_school = models.CharField(
\n<\/span><\/p>\n

max_length=2,
\n<\/span><\/p>\n

choices=YEAR_IN_SCHOOL_CHOICES,
\n<\/span><\/p>\n

default=FRESHMAN,
\n<\/span><\/p>\n

)
\n<\/span><\/p>\n

\n\u00a0<\/p>\n


\n\t\t\tdef is_upperclass(self):
\n<\/span><\/span><\/span><\/p>\n


\n\t\t\treturn self.year_in_school in (self.JUNIOR, self.SENIOR)
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n

View Code<\/span>
\n\t\t<\/span><\/p>\n

\u00a0<\/span>\u3000\u3000<\/span><\/span>4\u00a0 db_column\u00a0 <\/span>\u6570\u636e\u5e93<\/span>column<\/span>\u540d\u79f0\u3002\u9ed8\u8ba4\u4e3a\u672c\u5b57\u6bb5\u7684\u540d\u79f0\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>5\u00a0 db_index\u00a0 <\/span>\u5982\u679c\u4e3a<\/span>True<\/span>\u7684\u8bdd\uff0c\u8be5\u5b57\u6bb5\u7684\u6570\u636e\u5e93\u7d22\u5f15\u5c06\u4f1a\u88ab\u521b\u5efa<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>6\u00a0 default \u00a0 <\/span>\u8bbe\u7f6e\u8be5\u5b57\u6bb5\u7684\u9ed8\u8ba4\u503c\uff0c\u53ef\u4ee5\u662f\u503c\u4e5f\u53ef\u4ee5\u662f\u5bf9\u8c61\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>7\u00a0 editable\u00a0\u00a0 <\/span>\u9ed8\u8ba4\u4e3a<\/span>True<\/span>\uff0c\u82e5\u4e3a<\/span>False<\/span>\uff0c\u5219\u4e0d\u4f1a\u5728<\/span>admin\/<\/span>\u754c\u9762\u663e\u793a<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>8\u00a0 primary_key\u00a0 <\/span>\u82e5\u8bbe\u7f6e\u4e3a<\/span>True<\/span>\uff0c\u5219\u8868\u793a\u5c06\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u4e3b\u952e\u3002\u4e00\u822c\u60c5\u51b5\u4e0b<\/span>django<\/span>\u9ed8\u8ba4\u4f1a\u8bbe\u7f6e\u4e00\u4e2a\u81ea\u589e\u957f\u7684<\/span>id<\/span>\u4e3b\u952e\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>9\u00a0 unique\u00a0\u00a0 <\/span>\u82e5\u8bbe\u7f6e\u4e3a<\/span>True<\/span>\uff0c\u8be5\u5b57\u6bb5\u503c\u4e0d\u53ef\u91cd\u590d<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u4e8c<\/span>\u00a0 field type(<\/span>\u5b57\u6bb5\u7c7b\u578b<\/span>,<\/span>\u7ec6\u5206\u7684\u8bdd\u53ef\u4ee5\u5206\u4e3a\u666e\u901a\u5b57\u6bb5\u4ee5\u53ca\u5173\u7cfb\u5b57\u6bb5<\/span><\/strong><\/span>)<\/strong><\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000<\/strong><\/span>1 \u00a0<\/span>\u666e\u901a\u5b57\u6bb5<\/span><\/strong><\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>1\u00a0 AutoField()\u00a0 <\/span>\u6839\u636e\u5df2\u6709<\/span>id<\/span>\u81ea\u589e\u957f\u7684\u6574\u5f62\u552f\u4e00\u5b57\u6bb5\uff0c\u4e00\u822c\u6bcf\u4e2a<\/span>model<\/span>\u7c7b\u4e0d\u9700\u8bbe\u7f6e\u8be5\u5b57\u6bb5\uff0c\u56e0\u4e3a<\/span>django<\/span>\u4f1a\u4e3a\u6bcf\u4e2a<\/span>model<\/span>\u81ea\u52a8\u8bbe\u7f6e\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>django<\/span>\u9ed8\u8ba4\u4f1a\u4e3a\u6bcf\u4e2a<\/span>model<\/span>\u7c7b\u6dfb\u52a0\u5982\u4e0b\u8bed\u53e5\uff1a<\/span>id = models.AutoField(primary_key=True)\u00a0 <\/span>\u5f53\u5176\u4ed6\u5b57\u6bb5\u6dfb\u52a0\u4e86<\/span>primary_key<\/span>\u5c5e\u6027\uff0c\u5219\u4e0d\u4f1a\u521b\u5efa<\/span>id<\/span>\u5b57\u6bb5\u4e86<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u6bcf\u4e2a<\/span>model<\/span>\u7c7b\u4ec5\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>2\u00a0 BooleanField() \u00a0<\/span>\u5e03\u5c14\u578b\u5b57\u6bb5\uff0c\u9ed8\u8ba4\u7684\u8868\u5355\u7a97\u53e3\u90e8\u4ef6\u662f<\/span><\/span>CheckBoxInput<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>3\u00a0 CharField()\u00a0 <\/span>\u5b57\u7b26\u578b\u5b57\u6bb5\uff0c\u9ed8\u8ba4\u7684\u8868\u5355\u7a97\u53e3\u90e8\u4ef6\u662f<\/span>TextInput<\/span>\u3002\u8be5\u5b57\u6bb5\u7c7b\u578b\u6709\u4e00\u4e2a\u5fc5\u9700\u53c2\u6570\uff1a<\/span>max_length\u00a0 <\/span>\u5728\u6570\u636e\u5e93\u6c34\u5e73\u9650\u5b9a\u4e86\u5b57\u7b26\u4e32\u6700\u5927\u957f\u5ea6<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>4\u00a0 DateField()\u00a0 <\/span>\u65e5\u671f\u5b57\u6bb5\uff0c\u5b57\u6bb5\u7684\u503c\u662f<\/span>python<\/span>\u4e2d<\/span>datetime.date<\/span>\u7684\u5b9e\u4f8b\uff0c\u9ed8\u8ba4\u7684\u8868\u5355\u7a97\u53e3\u662f<\/span>TextInput<\/span>\u6709\u51e0\u4e2a\u53ef\u9009\u7684\u53c2\u6570\uff1a<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>auto_now=True\/False:<\/span>\u5f53\u8bbe\u7f6e\u4e3a<\/span>True<\/span>\u65f6\uff0c\u6bcf\u5f53\u8be5\u5bf9\u8c61\u4f7f\u7528<\/span>save()<\/span>\u65f6\uff0c\u8be5\u5b57\u6bb5\u7684\u503c\u5c31\u4f1a\u88ab\u66f4\u65b0\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>auto_now_add=True\/False: <\/span>\u5f53\u8bbe\u7f6e\u4e3a<\/span>True<\/span>\u65f6\uff0c\u8be5\u5b57\u6bb5\u7684\u503c\u4e3a\u8be5\u5bf9\u8c61\u88ab\u521b\u5efa\u65f6\u7684\u65e5\u671f<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>5\u00a0 DateTimeField()\u00a0 <\/span>\u65e5\u671f\u548c\u65f6\u95f4\u5b57\u6bb5\uff0c\u503c\u4e3a<\/span>datetime.datetime<\/span>\u5b9e\u4f8b\u3002\u9ed8\u8ba4\u7684\u8868\u5355\u7a97\u53e3\u4ee5\u53ca\u53ef\u9009\u53c2\u6570\u540c\u4e0a\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>6\u00a0 DecimalField()\u00a0 <\/span>\u6df7\u5408\u7cbe\u5ea6\u7684\u5c0f\u6570\u578b\u6570\u5b57\u5b57\u6bb5\u3002\u6709\u4e24\u4e2a\u5fc5\u9700\u7684\u53c2\u6570\uff1a<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>max_digits=ingt_number:<\/span>\u9650\u5b9a\u6570\u5b57\u7684\u6700\u5927\u4f4d\u6570\uff08\u5305\u542b\u5c0f\u6570\u4f4d\uff09<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>decimal_places=int_number:<\/span>\u5b58\u50a8\u6570\u5b57\u7684\u5c0f\u6570\u4f4d<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

#to store numbers up to 999 with a resolution of 2 decimal places, you’d use
\n\t\t\t<\/span><\/span><\/p>\n

models.DecimalField(…, max_digits=5, decimal_places=2)
\n<\/span><\/p>\n

\u00a0<\/span>\u3000\u3000<\/span><\/span>7\u00a0 EmailField(max_length=254<\/em>, **options<\/em>)\u00a0 <\/span>\u90ae\u4ef6\u5b57\u6bb5\uff0c\u4f7f\u7528<\/span><\/span>EmailValidator<\/span>\u8fdb\u884c\u9a8c\u8bc1<\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>8\u00a0 FileField(upload_to=None<\/em>, max_length=100<\/em>, **options<\/em>)\u00a0 <\/span>\u6587\u4ef6\u4e0a\u4f20\u5b57\u6bb5\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u8fd9\u4e2a\u5b57\u6bb5\u4e0d\u80fd\u8bbe\u7f6e<\/span><\/span>primary_key<\/span><\/span>\u548c<\/span>unique<\/span>\u9009\u9879<\/span><\/span>.<\/span>\u5728\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u7c7b\u578b\u662f<\/span>varchar<\/span>\uff0c\u9ed8\u8ba4\u6700\u5927\u957f\u5ea6\u4e3a<\/span><\/span>100.<\/span>
\n\t\t\t\t\t\t<\/span><\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u6709\u4e24\u4e2a\u53ef\u9009\u53c2\u6570\uff1a<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>upload_to<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000\u5982\u679c\u4f7f\u7528\u9ed8\u8ba4\u7684<\/span>FileSystomStorage<\/span>\uff0c\u6587\u4ef6\u5c06\u4f1a\u5b58\u50a8\u5230<\/span>settings<\/span>\u6587\u4ef6\u4e2d\u914d\u7f6e\u7684<\/span><\/span>MEDIA_ROOT<\/span>\u8def\u5f84\u4e2d\u3002<\/span>
\n\t\t\t\t\t\t\t<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000<\/span>upload_to<\/span>\u7684\u503c\u4e5f\u53ef\u4ee5\u4e3a\u53ef\u8c03\u7528\u5bf9\u8c61<\/span>,<\/span>\u901a\u8fc7\u8c03\u7528\u8fd9\u4e2a\u5bf9\u8c61\u53ef\u4ee5\u83b7\u5f97\u4e0a\u4f20\u8def\u5f84\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000<\/span>instance=:\u00a0 <\/span>\u5b9a\u4e49\u4e86<\/span>FileField<\/span>\u7684\u6a21\u578b\u5b9e\u4f8b<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000<\/span>filename=”:\u00a0 <\/span>\u6587\u4ef6\u540d\u79f0\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\"\"\/\"\"\/
\n\t\t<\/span><\/p>\n

class MyModel01(models.Model):
\n<\/span><\/span><\/p>\n


\n\t\t\t# file will be uploaded to MEDIA_ROOT\/uploads
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

upload = models.FileField(upload_to=‘uploads\/’)
\n<\/span><\/span><\/span><\/p>\n


\n\t\t\t# or…
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n


\n\t\t\t# file will be saved to MEDIA_ROOT\/uploads\/2015\/01\/30
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

upload = models.FileField(upload_to=‘uploads\/{d4daabd1ba368d9860c36387ddb72bbda14f8f9559d69d60a952800885260c03}Y\/{d4daabd1ba368d9860c36387ddb72bbda14f8f9559d69d60a952800885260c03}m\/{d4daabd1ba368d9860c36387ddb72bbda14f8f9559d69d60a952800885260c03}d\/’)
\n<\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

#upload_to=<\/span>\u53ef\u8c03\u7528\u5bf9\u8c61<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

def user_directory_path(instance, filename):
\n<\/span><\/span><\/p>\n


\n\t\t\t# file will be uploaded to MEDIA_ROOT\/user_<id>\/<filename>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n


\n\t\t\treturn
\n\t\t\t\t\t‘user_{0}\/{1}’.format(instance.user.id, filename)
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

class MyModel02(models.Model):
\n<\/span><\/span><\/p>\n

upload = models.FileField(upload_to=user_directory_path)
\n<\/span><\/p>\n

\u5b9e\u4f8b<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>storage\u00a0 <\/span>\u7528\u6765\u8bbe\u5b9a\u6587\u4ef6\u5b58\u50a8\u4ed3\u5e93\u3000\u3000\u3000\u3000<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>9\u00a0 FilePathField(path=None<\/em>, match=None<\/em>, recursive=False<\/em>, max_length=100<\/em>, **options<\/em>)<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u8fd9\u4e2a\u5b57\u6bb5\u7684\u503c\u88ab\u9650\u5236\u5728\u7cfb\u7edf\u4e0a\u67d0\u4e2a\u76ee\u5f55\u4e2d\u7684\u6240\u6709\u6587\u4ef6\u540d\u96c6\u5408\u4e2d\u3002\u6709\u4e09\u4e2a\u53c2\u6570<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>path=”:\u00a0 <\/span>\u8be5\u53c2\u6570\u5fc5\u9700\u3002\u4e0a\u884c\u6240\u8bf4\u7684<\/span>‘<\/span>\u67d0\u4e2a\u76ee\u5f55<\/span>‘<\/span>\u7684\u7edd\u5bf9\u8def\u5f84\u3002<\/span>Example: <\/span>“\/home\/images”<\/span><\/span>.<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>match=’pattern’:\u00a0 <\/span>\u53ef\u9009\u53c2\u6570\u3002\u683c\u5f0f\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\u3002\u7528\u6765\u62e3\u9009\u7b26\u5408\u5339\u914d\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u6587\u4ef6<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>recursive=True\/False: <\/span>\u53ef\u9009\u53c2\u6570\uff0c\u9ed8\u8ba4\u4e3a<\/span>False<\/span>\u3002\u8bbe\u5b9a\u662f\u5426\u9012\u5f52\u8be5\u76ee\u5f55\u4e0b\u6240\u6709\u5b50\u76ee\u5f55\u7684\u6240\u6709\u6587\u4ef6\u3002\u3000\u3000\u3000\u3000<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

FilePathField(path=“\/home\/images”, match=“foo.*”, recursive=True)
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>10\u00a0 FloatField()\u00a0 <\/span>\u6d6e\u70b9\u5b57\u6bb5\uff0c\u9ed8\u8ba4\u7684\u8868\u5355\u7a97\u53e3\u90e8\u4ef6\u662f<\/span>NumberInput<\/span>\u3002\u548c<\/span>DecimalField<\/span>\u7ecf\u5e38\u6df7\u6dc6\u4e0d\u6e05\uff0c<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>FloatField<\/span>\u5728\u5185\u90e8\u4f7f\u7528<\/span>Python<\/span>\u4e2d\u7684<\/span>float<\/span>\u5bf9\u8c61\uff0c\u800c<\/span>DecimalField<\/span>\u5728\u5185\u90e8\u4f7f\u7528<\/span>Python<\/span>\u4e2d\u7684<\/span>decimal<\/span>\u5bf9\u8c61\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>11\u00a0 ImageField(upload_to=None<\/em>, height_field=None<\/em>, width_field=None<\/em>, max_length=100<\/em>, **options<\/em>)\u00a0 <\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u56fe\u50cf\u5b57\u6bb5\u3002\u7ee7\u627f\u4e86<\/span>FileField<\/span>\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u800c\u4e14\u8fd8\u80fd\u81ea\u52a8\u9a8c\u8bc1\u4e0a\u4f20\u7684\u5bf9\u8c61\u662f\u5426\u4e3a\u5408\u6cd5\u7684\u56fe\u50cf\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>12\u00a0 IntegerField\u00a0 <\/span>\u6574\u5f62\u5b57\u6bb5\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>13\u00a0 GenericIPAddressField(protocol=’both’<\/em>, unpack_ipv4=False<\/em>, **options<\/em>)\u00a0 ip<\/span>\u5730\u5740\u5b57\u6bb5<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>protocol=’both\/ipv4\/ipv6′\u00a0 <\/span>\u9ed8\u8ba4\u4e3a<\/span><\/span>both<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>unpack_ipv4 \u00a0 <\/span>\u7528\u5904\u4e0d\u5927\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>14\u00a0 NullBooleanField\u00a0 <\/span>\u7c7b\u4f3c\u4e8e<\/span>BooleanField<\/span>\uff0c\u4e0d\u540c\u7684\u662f\u5176\u5141\u8bb8\u503c\u4e3a<\/span><\/span>null<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>15\u00a0 TextField() \u00a0 <\/span>\u4e0e<\/span>CharField<\/span>\u7c7b\u4f3c\uff0c\u4f46\u4e00\u822c\u7528\u6765\u5b58\u50a8\u4f53\u79ef\u8f83\u5927\u7684\u6587\u672c\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>16\u00a0 TimeField(auto_now=False<\/em>, auto_now_add=False<\/em>, **options<\/em>) \u00a0 <\/span>\u65f6\u95f4\u5b57\u6bb5\uff0c\u5176\u503c\u4e3a<\/span>datetime.time<\/span>\u5b9e\u4f8b<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>17\u00a0 URLField(max_length=200<\/em>, **options<\/em>)\u00a0\u00a0\u00a0 URL<\/span>\u5b57\u6bb5<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u7c7b\u4f3c\u4e8e<\/span>CharField<\/span>\u7684\u5b50\u7c7b\uff0c\u9ed8\u8ba4\u6700\u5927\u957f\u5ea6\u4e3a<\/span><\/span>200.<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>18\u00a0 UUIDField(**options<\/em>)\u00a0 <\/span>\u901a\u7528\u552f\u4e00\u6807\u8bc6\u5b57\u6bb5\uff0c\u5f53\u4e0d\u60f3\u7528<\/span>django<\/span>\u9ed8\u8ba4\u8bbe\u7f6e\u7684<\/span>AutoField<\/span>\u5b57\u6bb5\u65f6\uff0c\u53ef\u4ee5\u7528\u8be5\u5b57\u6bb5\u4ee3\u66ff\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u00a0
\n\u00a0<\/p>\n

\u3000<\/span>
\n\t\t\t\t<\/span>2 \u00a0<\/strong><\/span><\/span>\u5173\u7cfb\u5b57\u6bb5<\/strong><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/strong>\u5173\u7cfb\u5b57\u6bb5\uff1a\u4e00\u5bf9\u4e00\uff0c\u591a\u5bf9\u4e00\uff0c\u591a\u5bf9\u591a<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u4e00\u5bf9\u4e00\uff1a<\/span>\u00a0 <\/span>\u73b0\u5728\u6709\u5f88\u591a\u4e00\u5bf9\u4e00\u8f85\u5bfc\u73ed\uff0c\u4e5f\u5c31\u662f\u4e0a\u8bfe\u65f6\uff0c\u4e00\u4e2a\u8001\u5e08\u5bf9\u5e94\u4e00\u4e2a\u5b66\u751f\uff0c\u4e00\u4e2a\u5b66\u751f\u5bf9\u5e94\u4e00\u4e2a\u8001\u5e08<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u591a\u5bf9\u4e00\uff1a<\/span>\u00a0 <\/span>\u5f88\u591a\u504f\u8fdc\u5c71\u533a\u7684\u5b66\u6821\u53ef\u80fd\u6574\u4e2a\u5b66\u6821\u53ea\u6709\u4e00\u4e2a\u8001\u5e08\uff0c\u8fd9\u4e00\u4e2a\u8001\u5e08\u5bf9\u5e94\u591a\u4e2a\u5b66\u751f\uff0c\u6240\u6709\u7684\u5b66\u751f\u5bf9\u5e94\u8fd9\u4e00\u4e2a\u8001\u5e08<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u591a\u5bf9\u591a\uff1a<\/span>\u00a0 <\/span>\u800c\u6211\u4eec\u5219\u5f88\u5e78\u798f\uff0c\u5b66\u6821\u91cc\u6709\u8bb8\u591a\u8001\u5e08\uff0c\u4e00\u4e2a\u8001\u5e08\u6559\u4e60\u4e00\u79d1\uff0c\u5b66\u751f\u6709\u591a\u4e2a\u8001\u5e08\uff0c\u8001\u5e08\u6709\u591a\u4e2a\u5b66\u751f\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000<\/span>1\u00a0 ForeignKey(othermodel<\/em>, on_delete<\/em>, **options<\/em>)\u00a0 <\/span>\u591a\u5bf9\u4e00\u6216\u8005\u4e00\u5bf9\u591a\u6216\u8005\u5916\u952e\u5b57\u6bb5\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>othermodel<\/strong><\/span>\uff1a<\/span>\u00a0 <\/span>\u6240\u5173\u8054\u7684\u6a21\u578b\uff0c<\/span>‘<\/span>\u591a<\/span>‘ model<\/span>\u4f7f\u7528\u5916\u952e\u5173\u8054<\/span>\u00a0 ‘<\/span>\u4e00<\/span>‘model<\/span>\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000\u5f53\u6240\u5173\u8054\u7684\u6a21\u578b\u4e3a\u4ed6\u81ea\u5df1\u65f6\uff0c\u4f7f\u7528<\/span>‘self’<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000\u5f53\u5f15\u7528\u7684\u6a21\u578b\u4e3a\u5176\u4ed6<\/span>app<\/span>\u4e2d\u7684\u6a21\u578b\u65f6\uff0c\u8981\u52a0\u4e0a<\/span>app<\/span>\u540d\u79f0\u6807\u7b7e<\/span><\/span>:\u00a0 ‘app_name.model_name’<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000\u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u5728\u5916\u952e\u5b57\u6bb5\u4e0a\u521b\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528<\/span>de_index=False<\/span>\u5173\u95ed\u8be5\u529f\u80fd\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>on_delete<\/strong><\/span>\uff1a<\/span>
\n\t\t\t\t\t\t<\/span>\u5f53\u5220\u9664<\/span> “<\/span>\u4e00<\/span>” <\/span>\u6a21\u578b\u5bf9\u8c61\u65f6\uff0c<\/span>django<\/span>\u4f1a\u6839\u636e\u8be5\u53c2\u6570\u7684\u503c\u5bf9\u4e0e\u8be5\u5bf9\u8c61\u76f8\u5173\u8054\u7684\u5176\u4ed6\u5bf9\u8c61<\/span>(<\/span>\u4e5f\u5c31\u662f<\/span> ‘<\/span>\u591a<\/span>‘)<\/span>\u8fdb\u884c\u64cd\u4f5c\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u5728<\/span>django1.9<\/span>\u4ee5\u53ca\u4e4b\u524d\u7684\u7248\u672c\u4e2d\uff0c<\/span>on_delete<\/span>\u4f5c\u4e3a\u4e00\u4e2a\u5173\u952e\u5b57\u53c2\u6570\u3002\u800c\u5728<\/span>1.10<\/span>\u5219\u53ef\u4ee5\u4f5c\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000<\/span>models.CASCADE<\/span>\uff1a<\/span> \u00a0 <\/span>\u9ed8\u8ba4\u4e3a<\/span>models.CASCADE \u00a0 <\/span>\u7ea7\u8054\u5220\u9664\u3002\u5f53\u5220\u9664<\/span>‘<\/span>\u4e00<\/span>‘<\/span>\u65f6\uff0c<\/span>‘<\/span>\u591a<\/span>‘<\/span>\u4f1a\u88ab\u5220\u9664\u3002\u6bd4\u5982\uff1a<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\"\"\/
\n\t\t<\/span><\/p>\n

# mysite<\/span>\u9879\u76ee\u4e0b\u540d\u4e3a<\/span>polls<\/span>\u7684<\/span>app<\/span>\u4e2d\u7684<\/span>models.py
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

class follower(models.Model):
\n<\/span><\/span><\/p>\n

name = models.CharField(max_length=200)
\n<\/span><\/p>\n

menpai = models.ForeignKey(‘menpai’, on_delete=models.CASCADE) #<\/span><\/span><\/span><\/span>\u5b9a\u4e49\u4e86<\/span>models.CASCADE<\/span>\u5c5e\u6027<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n


\n\t\t\tdef
\n\t\t\t\t\t__str__(self):
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n


\n\t\t\treturn self.name
\n<\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

class menpai(models.Model):
\n<\/span><\/span><\/p>\n

name = models.CharField(max_length=200)
\n<\/span><\/p>\n

\n\u00a0<\/p>\n


\n\t\t\tdef
\n\t\t\t\t\t__str__(self):
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n


\n\t\t\treturn self.name
\n<\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

#<\/span>\u8fd0\u884c<\/span> python3 manager.py shell<\/span>\u8fdb\u5165\u4ea4\u4e92\u9875\u9762<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

>>> from polls.models import follower,menpai
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n

>>> m1=menpai(name=‘huashanpai’)
\n<\/span><\/span><\/span><\/p>\n

>>> m1.save()
\n<\/span><\/p>\n

>>> m2=menpai(name=‘riyuejiao’)
\n<\/span><\/span><\/span><\/p>\n

>>> m2.save()
\n<\/span><\/p>\n

>>> f1=follower(name=‘linghuchong’,menpai=m1)
\n<\/span><\/span><\/span><\/p>\n

>>> f1.save()
\n<\/span><\/p>\n

>>> f2=follower(name=‘renwoxing’,menpai=m2)
\n<\/span><\/span><\/span><\/p>\n

>>> f2.save()
\n<\/span><\/p>\n

>>> f1.menpai
\n<\/span><\/p>\n

<menpai: huashanpai>
\n<\/span><\/p>\n

>>> m1.delete()
\n<\/span><\/p>\n

(2, {‘polls.menpai’: 1, ‘polls.follower’: 1}) # <\/span><\/span><\/span><\/span><\/span><\/span>\u5220\u9664\u534e\u5c71\u6d3e\u65f6\uff0c\u5c06\u4ee4\u72d0\u51b2\u4e5f\u5220\u9664\u4e86<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

View Code<\/span>
\n\t\t<\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000<\/span>modles.PROTECT : \u00a0\u00a0 <\/span>\u5f53\u5220\u9664\u4e00\u4e2a\u5177\u6709\u5916\u952e\u5173\u7cfb\u7684\u5bf9\u8c61\u65f6\uff0c\u4f1a\u5f15\u53d1\u4e00\u4e2a\u5f02\u5e38\uff0c\u963b\u6b62\u5220\u9664\u8be5\u5bf9\u8c61<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000<\/span>models.SET_NULL: \u00a0 <\/span>\u8bbe\u7f6e\u5220\u9664\u5bf9\u8c61\u6240\u5173\u8054\u7684\u5916\u952e\u5b57\u6bb5\u4e3a<\/span>null<\/span>\u3002\u4f46\u5b57\u6bb5\u7684<\/span>null<\/span>\u5c5e\u6027\u5fc5\u9700\u4e3a<\/span><\/span>True<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000<\/span>models.SET_DEFAULT : \u00a0\u00a0 <\/span>\u8bbe\u7f6e\u5220\u9664\u5bf9\u8c61\u6240\u5173\u8054\u7684\u5916\u952e\u5b57\u6bb5\u4e3a\u9ed8\u8ba4\u7684\u503c\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000<\/span>models.SET(value)\u00a0 <\/span>\uff1a\u8bbe\u7f6e\u5220\u9664\u5bf9\u8c61\u6240\u5173\u8054\u7684\u5bf9\u8c61\u7684\u5916\u952e\u5b57\u6bb5\u4e3a<\/span>value,value<\/span>\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u53ef\u8c03\u7528\u51fd\u6570\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\"\"\/
\n\t\t<\/span><\/p>\n

from django.conf import settings
\n<\/span><\/span><\/span><\/span><\/p>\n

from django.contrib.auth import get_user_model
\n<\/span><\/span><\/span><\/span><\/p>\n

from django.db import models
\n<\/span><\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

def get_sentinel_user():
\n<\/span><\/span><\/p>\n


\n\t\t\treturn get_user_model().objects.get_or_create(username=‘deleted’)[0]
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

class MyModel(models.Model):
\n<\/span><\/span><\/p>\n

user = models.ForeignKey(
\n<\/span><\/p>\n

settings.AUTH_USER_MODEL,
\n<\/span><\/p>\n

on_delete=models.SET(get_sentinel_user),
\n<\/span><\/p>\n

)
\n<\/span><\/p>\n

models.SET()<\/span>\u5b9e\u4f8b<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000\u3000\u3000<\/span>models.DO_NOTHING :\u00a0 <\/span>\u4e0d\u505a\u4efb\u4f55\u64cd\u4f5c<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>limit_choices_to<\/strong>\u00a0 <\/span><\/span>\u9650\u5236\u8be5\u5b57\u6bb5\u4e3a\u9009\u9879\u5f62\u3002\u683c\u5f0f\uff1a<\/span><\/span>limit_choices_to={‘is_staff’: True}<\/span>\u3002\u503c\u4e5f\u53ef\u4ee5\u4e3a\u53ef\u8c03\u7528\u51fd\u6570\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\"\"\/\"\"\/
\n\t\t<\/span><\/p>\n

def limit_pub_date_choices():
\n<\/span><\/span><\/p>\n


\n\t\t\treturn {‘pub_date__lte’: datetime.date.utcnow()}
\n<\/span><\/span><\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

limit_choices_to = limit_pub_date_choices
\n<\/span><\/p>\n

\u5b9e\u4f8b<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>related_name<\/strong>\u00a0 <\/span><\/span>\u8bbe\u7f6e\u4ece\u5173\u8054\u5bf9\u8c61\u5230\u81ea\u8eab\u7684\u5173\u7cfb\u7684\u540d\u79f0\uff0c\u82e5\u503c\u4e3a<\/span><\/span>‘+’\u00a0 <\/span>\u5219\u5173\u8054\u5bf9\u8c61\u4e0e\u81ea\u8eab\u65e0\u9006\u5411\u5173\u7cfb\u3002\u8be6\u89e3\u8bf7\u770b\u5b98\u65b9\u6587\u6863<\/span><\/a>\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>to_field<\/strong>\u00a0 <\/span><\/span>\u8bbe\u7f6e\u6240\u5173\u8054\u5bf9\u8c61\u7684\u5173\u8054\u5b57\u6bb5\u3002\u9ed8\u8ba4\u4e3a\u5173\u8054\u5bf9\u8c61\u7684\u4e3b\u952e\u5b57\u6bb5\u3002<\/span><\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000
\n\u00a0<\/p>\n

\u3000\u3000<\/span>2\u00a0 ManyToManyField(othermodel<\/em>, **options<\/em>)\u00a0 <\/span>\u591a\u5bf9\u591a\u5b57\u6bb5\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>othermodel<\/strong>:\u00a0 <\/span><\/span>\u6240\u5173\u8054\u7684<\/span><\/span>model<\/span>\u540d\u79f0<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>db_table<\/strong>:\u00a0 <\/span><\/span>\u591a\u5bf9\u591a\u5173\u7cfb\u4f1a\u5728\u4e24\u4e2a\u6a21\u578b\u6240\u5bf9\u5e94\u7684\u8868\u4e2d\u95f4\u521b\u5efa\u4e00\u4e2a<\/span><\/span>‘<\/span>\u4e2d\u95f4\u8868<\/span>‘ <\/span>\uff0c\u5c06\u591a\u5bf9\u591a\u8f6c\u6362\u4e3a\u4e24\u4e2a\u591a\u5bf9\u4e00\uff0c\u8be5\u9009\u9879\u4e3a\u8fd9\u4e2a\u4e2d\u95f4\u8868\u8bbe\u7f6e\u540d\u79f0\u3002\u4e00\u822c\u6765\u8bf4<\/span>django<\/span>\u4f1a\u9ed8\u8ba4\u4e3a\u4e2d\u95f4\u8868\u521b\u5efa\u540d\u79f0\uff0c\u4f46\u4eba\u4eec\u8bfb\u8d77\u6765\u53ef\u80fd\u641e\u4e0d\u6e05\u695a\u7a76\u7adf\u4e2d\u95f4\u8868\u5173\u8054\u5230\u4e86\u54ea\u91cc\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>related_name<\/strong>:\u00a0 <\/span><\/span>\u540c\u591a\u5bf9\u4e00\u5b57\u6bb5\u4e2d\u7684<\/span><\/span>related_name<\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>limite_choices_to<\/strong>:\u00a0 <\/span><\/span>\u540c<\/span><\/span>….<\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>symmetrical<\/strong>:\u00a0 <\/span><\/span>\u5f53\u591a\u5bf9\u591a\u5173\u8054\u5bf9\u8c61\u4e3a\u81ea\u8eab\u65f6\u53ef\u80fd\u4f1a\u7528\u5230\u7684\u53c2\u6570\u3002\u9ed8\u8ba4\u4e3a<\/span><\/span>True<\/span>\u3002<\/span>a,b<\/span>\u540c\u5c5e\u4e8e<\/span>person<\/span>\u6a21\u578b\uff0c<\/span>person<\/span>\u4e2d\u7684<\/span>friends<\/span>\u5b57\u6bb5\u4e0e\u81ea\u8eab\u8bbe\u7f6e\u4e86\u591a\u5bf9\u591a\u5173\u7cfb\uff0c\u5f53\u8be5\u503c\u8bbe\u7f6e\u4e3a<\/span>True<\/span>\u65f6\uff0c<\/span>django<\/span>\u5047\u5b9a\u5173\u7cfb\u4e3a\u5bf9\u79f0\uff0c\u5373\uff1a<\/span>a<\/span>\u662f<\/span>b<\/span>\u7684\u670b\u53cb\uff0c\u90a3\u4e48<\/span>b<\/span>\u4e5f\u662f<\/span>a<\/span>\u7684\u670b\u53cb\u3002\u8bbe\u7f6e\u4e3a<\/span>False<\/span>\u65f6\uff0c<\/span>django<\/span>\u4f1a\u5f3a\u5236\u4e3a\u9006\u5411\u5173\u7cfb\u521b\u5efa\u63cf\u8ff0\u4fe1\u606f\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>though<\/strong>:\u00a0 <\/span><\/span>\u4e0d\u60f3\u8ba9<\/span><\/span>django<\/span>\u81ea\u52a8\u521b\u5efa\u4e2d\u95f4\u8868\uff0c\u624b\u52a8\u521b\u5efa\u4e2d\u95f4\u8868\u6240\u5bf9\u5e94\u7684<\/span>model<\/span>\uff0c\u901a\u8fc7<\/span>though<\/span>\u6307\u5b9a\u5bf9\u5e94\u7684<\/span>model<\/span>\u540d\u79f0\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>though_field<\/strong>:\u00a0 <\/span><\/span>\u5f53<\/span><\/span>though<\/span>\u53c2\u6570\u88ab\u4f7f\u7528\u65f6\uff0c\u8be5\u53c2\u6570\u624d\u4f1a\u6709\u6548\u3002\u6307\u5b9a\u4f7f\u7528\u54ea\u4e9b\u4e2d\u95f4\u6a21\u578b\u5b57\u6bb5\u6765\u786e\u7acb\u4e24\u4e2a\u6a21\u578b\u7684\u591a\u5bf9\u591a\u5173\u7cfb\u3002<\/span><\/span>
\n\t\t\t\t\t<\/span><\/span><\/span><\/span><\/p>\n

\u3000\u3000<\/span>3\u00a0 OneToOneField(othermodel<\/em>, on_delete<\/em>, parent_link=False<\/em>, **options<\/em>)\u00a0 <\/span>\u4e00\u5bf9\u4e00\u5b57\u6bb5\u3002<\/span><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>othermodel: …….<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>on_delete:……..<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n

\u3000\u3000\u3000\u3000<\/span>related_name:………..<\/span>
\n\t\t\t\t<\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u672c\u6587\u53c2\u8003\u81ea\uff1adjango\u5b98\u65b9\u6587…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,10],"tags":[],"class_list":["post-743","post","type-post","status-publish","format-standard","hentry","category-python","category-jishu"],"_links":{"self":[{"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts\/743"}],"collection":[{"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=743"}],"version-history":[{"count":1,"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts\/743\/revisions"}],"predecessor-version":[{"id":983,"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts\/743\/revisions\/983"}],"wp:attachment":[{"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=743"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=743"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=743"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}