序列化组件

序列化组件

• 使用depth获取跨表数据

当有表有外键存在时，在序列化组件时简单的获取关联表的数据方法
class CourseSerializers(ModelSerializer):
	class Meta:
		model = Course
		fields = '__all__'
         depth = 1 # 建议0-10  当为0时，无作用，当为1时，可以获取外键关联的表的数据，当为2时可获取外键关联的表再关联的表的数据

• 使用source获取OneToOne关联表的数据,获取model中choices中的中文

class CourseDetailSerializer(ModelSerializer):
    # 自定义字段实现获取一对一跨表数据
    title = serializers.CharField(source='course.title')
    src = serializers.CharField(source='course.src')
    #获取model中choices中的中文
    leave = serializers.CharField(source='course.get_leave_display')
    class Meta:
		model = Course
		fields = ['title','src','leave']

• serializers.SerializerMethodField()获取跨表的多条数据

class CourseDetailSerializer(ModelSerializer):
    # 自定义字段实现获取一对一跨表数据
    title = serializers.CharField(source='course.title')
    src = serializers.CharField(source='course.src')
    #获取model中choices中的中文
    leave = serializers.CharField(source='course.get_leave_display')
    recommends = serializers.SerializerMethodField()
	chapter = serializers.SerializerMethodField()	
	def get_chapter(self,obj):
		queryset = obj.course.chapter_set.all()
		return [{'num':item.num,'name':item.name} for item in queryset]
	def get_recommends(self,obj):
		queryset = obj.recommend_course.all()	
		return [{'id':item.id,'title':item.title} for item in queryset]
	class Meta:
		model = CourseDetail
		fields = ['course','slogon','why','leave','title','src','recommends','chapter']

# models.py
from django.db import models
class Course(models.Model):
	'''课程表'''
	leave_choices = (
		(0, '初级课程'),
		(1, '中级课程'),
		(2, '高级课程'),
	)
	title = models.CharField(max_length=32, verbose_name='课程名称')
	src = models.CharField(verbose_name='课程图片', max_length=128)
	leave = models.SmallIntegerField(verbose_name='课程难易程度', choices=leave_choices, default=0)

class CourseDetail(models.Model):
	'''课程详情'''
	course = models.OneToOneField(verbose_name='课程名称', to='Course')
	slogon = models.CharField(verbose_name='口号', max_length=64)
	why = models.CharField(verbose_name='学习目的', max_length=255)
	recommend_course = models.ManyToManyField(verbose_name='推荐课程', to='Course',related_name='rc')

class Chapter(models.Model):
	'''章节表'''
	num = models.IntegerField(verbose_name='章节')
	name = models.CharField(verbose_name='章节名称', max_length=32)
	course = models.ForeignKey(verbose_name='所属课程', to='Course')