序列化 正向查詢 和反向查詢

#課程標籤

class coursetag(base):
title = models.charfield('課程標籤', max_length=32)
sequence = models.integerfield('展示順序', default=10)
class meta:
db_table = 'tb_coursetag'
def __str__(self):
return self.title
class course(base):
status = (
('0', '即將上線'),
('1', '已上線'),
('2', '已下線'),
)title = models.charfield('課程名', max_length=24)
desc = models.charfield('課程名', max_length=256)
img = models.imagefield('課程logo', upload_to='course', null=true)
course_type = models.foreignkey(coursetype, verbose_name='課程類別', on_delete=models.cascade, default=none, null=true)
course_tag = models.manytomanyfield(coursetag, verbose_name='課程標籤')
status = models.charfield('課程狀態', choices=status, max_length=8, default='1')
attention = models.integerfield('關注人數', default=0)
learner = models.integerfield('學習人數', default=0)
class meta:
db_table = 'tb_course'
def __str__(self):
return self.title

正向查詢

class coursecourseserializers(serializers.modelserializer):

corse_type = serializers.charfield(source='course_type.title')
class meta:
model=course
fields='__all__'

反向查詢

class coursetypeserializers(serializers.modelserializer):

course_set= coursecourseserializers(many=true) # 表明+set
class meta:
model=coursetype
fields='__all__'

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