1. 建模

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey,GenericRelation
from django.contrib.contenttypes.models import ContentType # Create your models here. class CourseCategory(models.Model):
"""
课程大类, e.g 前端 后端...
"""
name =models.CharField(max_length=,unique=True) def __str__(self):
return "%s" %self.name class Meta:
verbose_name_plural ="01.课程大纲" class CourseSubCategory(models.Model):
# 课程子类,e.g python linux
category =models.ForeignKey("CourseCategory")
name =models.CharField(max_length=,unique=True) def __str__(self):
return "%s" % self.name class Meta:
verbose_name_plural="02.课程子类" class DegreeCourse(models.Model):
"""
学位课
"""
name =models.CharField(max_length=,unique=True)
course_img =models.CharField(max_length=,verbose_name="缩略图")
brief =models.TextField(verbose_name="学位课程简介",)
total_scholarship =models.PositiveIntegerField(verbose_name="总奖金(贝里)",default=)
mentor_compensation_bonus =models.PositiveIntegerField(verbose_name="本课程的倒是辅导费用(贝里)",default=)
period = models.PositiveIntegerField(verbose_name="建议学习周期(days)",default=)#为了计算学位奖学金
prerequisite=models.TextField(verbose_name="课程先修要求",max_length=)
teachers = models.ManyToManyField("Teacher",verbose_name="课程讲师") #用于GenericForeignKey反向查询,不会生成表字段,切勿删除
# coupon =GenericRelation("Coupon") #用于GenricForeignKey反向查询,不会产生字段,切勿删除.
degreecourse_price_policy =GenericRelation("PricePolicy") def __str__(self):
return self.name class Meta:
verbose_name_plural= "03.学位课" class Teacher(models.Model):
#讲师、导师表
name =models.CharField(max_length=)
role_choices =((,"讲师"),(,"导师"))
role = models.SmallIntegerField(choices=role_choices,default= )
title =models.CharField(max_length=,verbose_name="职位,职称")
signature= models.CharField(max_length=,help_text="导师签名",blank=True,null=True)
image =models.CharField(max_length=)
brief =models.TextField(max_length=) def __str__(self):
return self.name
class Meta:
verbose_name_plural="04.导师或讲师" class Scholarship(models.Model):
#学位课程奖学金
degree_course=models.ForeignKey("DegreeCourse")
time_percent =models.PositiveIntegerField(verbose_name="奖励档位(时间百分比)",help_text="只填百分之,如80,代表80%")
value =models.PositiveIntegerField(verbose_name="奖学金数额") def __str__(self):
return "%s:%s"%(self.degree_course,self.value) class Meta:
verbose_name_plural ="05.学位课奖学金" class Course(models.Model):
#专业课程
name = models.CharField(max_length=,unique=True)
course_img =models.CharField(max_length=)
sub_category =models.ForeignKey("CourseSubCategory")
course_type_choice =((,"付费"),(,"vip专享"),(,"学位课程"))
course_type =models.SmallIntegerField(choices=course_type_choice)
degree_course =models.ForeignKey("DegreeCourse",blank=True,null= True,help_text="若是学位课程,此处关联学位表")
brief =models.TextField(verbose_name="课程概述",max_length=)
level_choices =((,"初级"),(,"中级"),(,"高级"))
level =models.SmallIntegerField(choices=level_choices,default= )
pub_date =models.DateField(verbose_name="发布时间",blank=True,null=True)
period = models.PositiveIntegerField(verbose_name="建议学习周期(days)",default=)
order =models.IntegerField("课程顺序",help_text="从上一个课程往后排")
attachment_patch =models.CharField(max_length=,verbose_name="课程路径",blank=True,null=True)
status_choice =((,"上线"),(,"下线"),(,"预上线"))
template_id=models.SmallIntegerField(choices=status_choice,default= )
# coupon =GenericRelation("Coupon")
#用于GenericForeignKey反向查询,不会生成表字段,切勿删除.
price_policy=GenericRelation("PricePolicy") asked_question =GenericRelation("OftenAskedQuestion") def __str__(self):
return "%s(%s)"%(self.name ,self.get_course_type_display()) def save(self, *args ,**kwargs):
if self.course_type== :
if not self.degree_course:
raise ValueError("学位课程必须关联对应的学位表")
super(Course, self).save(*args,**kwargs) class Meta:
verbose_name_plural="06.专题课程或学位课程模块" class CourseDetail(models.Model):
"""课程详情页内容"""
course = models.OneToOneField("Course")
hours = models.IntegerField("课时")
course_slogan = models.CharField(max_length=, blank=True, null=True)
video_brief_link = models.CharField(verbose_name='课程介绍', max_length=, blank=True, null=True)
why_study = models.TextField(verbose_name="为什么学习这门课程")
what_to_study_brief = models.TextField(verbose_name="我将学到哪些内容")
career_improvement = models.TextField(verbose_name="此项目如何有助于我的职业生涯")
prerequisite = models.TextField(verbose_name="课程先修要求", max_length=)
recommend_courses = models.ManyToManyField("Course", related_name="recommend_by", blank=True)
teachers = models.ManyToManyField("Teacher", verbose_name="课程讲师") def __str__(self):
return "%s" % self.course class Meta:
verbose_name_plural = "07.课程或学位模块详细" class OftenAskedQuestion(models.Model):
"""常见问题"""
content_type = models.ForeignKey(ContentType,
limit_choices_to={'model__contains': 'course'}) # 关联course or degree_course
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey('content_type', 'object_id') question = models.CharField(max_length=)
answer = models.TextField(max_length=) def __str__(self):
return "%s-%s" % (self.content_object, self.question) class Meta:
unique_together = ('content_type', 'object_id', 'question')
verbose_name_plural = "08. 常见问题" class CourseOutline(models.Model):
"""课程大纲"""
course_detail = models.ForeignKey("CourseDetail")
title = models.CharField(max_length=)
# 前端显示顺序
order = models.PositiveSmallIntegerField(default=) content = models.TextField("内容", max_length=) def __str__(self):
return "%s" % self.title class Meta:
unique_together = ('course_detail', 'title')
verbose_name_plural = "09. 课程大纲" class CourseChapter(models.Model):
"""课程章节"""
course = models.ForeignKey("Course", related_name='coursechapters')
chapter = models.SmallIntegerField(verbose_name="第几章", default=)
name = models.CharField(max_length=)
summary = models.TextField(verbose_name="章节介绍", blank=True, null=True)
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True) class Meta:
unique_together = ("course", 'chapter')
verbose_name_plural = "10. 课程章节" def __str__(self):
return "%s:(第%s章)%s" % (self.course, self.chapter, self.name) class CourseSection(models.Model):
"""课时目录"""
chapter = models.ForeignKey("CourseChapter", related_name='coursesections')
name = models.CharField(max_length=)
order = models.PositiveSmallIntegerField(verbose_name="课时排序", help_text="建议每个课时之间空1至2个值,以备后续插入课时")
section_type_choices = ((, '文档'), (, '练习'), (, '视频'))
section_type = models.SmallIntegerField(default=, choices=section_type_choices)
section_link = models.CharField(max_length=, blank=True, null=True, help_text="若是video,填vid,若是文档,填link")
video_time = models.CharField(verbose_name="视频时长", blank=True, null=True, max_length=) # 仅在前端展示使用
pub_date = models.DateTimeField(verbose_name="发布时间", auto_now_add=True)
free_trail = models.BooleanField("是否可试看", default=False) class Meta:
unique_together = ('chapter', 'section_link')
verbose_name_plural = "11. 课时" def __str__(self):
return "%s-%s" % (self.chapter, self.name) class Homework(models.Model):
chapter = models.ForeignKey("CourseChapter")
title = models.CharField(max_length=, verbose_name="作业题目")
order = models.PositiveSmallIntegerField("作业顺序", help_text="同一课程的每个作业之前的order值间隔1-2个数")
homework_type_choices = ((, '作业'), (, '模块通关考核'))
homework_type = models.SmallIntegerField(choices=homework_type_choices, default=)
requirement = models.TextField(max_length=, verbose_name="作业需求")
threshold = models.TextField(max_length=, verbose_name="踩分点")
recommend_period = models.PositiveSmallIntegerField("推荐完成周期(天)", default=)
scholarship_value = models.PositiveSmallIntegerField("为该作业分配的奖学金(贝里)")
note = models.TextField(blank=True, null=True)
enabled = models.BooleanField(default=True, help_text="本作业如果后期不需要了,不想让学员看到,可以设置为False") class Meta:
unique_together = ("chapter", "title")
verbose_name_plural = "12. 章节作业" def __str__(self):
return "%s - %s" % (self.chapter, self.title) class PricePolicy(models.Model):
"""价格与有课程效期表"""
content_type = models.ForeignKey(ContentType) # 关联course or degree_course
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey('content_type', 'object_id') # course = models.ForeignKey("Course")
valid_period_choices = ((, '1天'), (, '3天'),
(, '1周'), (, '2周'),
(, '1个月'),
(, '2个月'),
(, '3个月'),
(, '6个月'), (, '12个月'),
(, '18个月'), (, '24个月'),
)
valid_period = models.SmallIntegerField(choices=valid_period_choices)
price = models.FloatField() class Meta:
unique_together = ("content_type", 'object_id', "valid_period")
verbose_name_plural = "15. 价格策略" def __str__(self):
return "%s(%s)%s" % (self.content_object, self.get_valid_period_display(), self.price)

2. settings设置

INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'app01.apps.App01Config',
'api.apps.ApiConfig',
"rest_framework"
]

3. url 路径

urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^api/(?P<version>\w+)/', include("api.api_url")),
]
from api.views import course

urlpatterns=[
url(r'courses/',course.CourseView.as_view()),
# url(r'courses/(?P<pk>\d+)',course.CourseView.as_view())
]

4. 在admin文件中注册

from django.contrib import admin

# Register your models here.
from api.models import * admin.site.register(CourseCategory)
admin.site.register(CourseSubCategory)
admin.site.register(DegreeCourse)
admin.site.register(Teacher)
admin.site.register(Scholarship)
admin.site.register(Course)
admin.site.register(CourseDetail)
admin.site.register(OftenAskedQuestion)
admin.site.register(CourseOutline)
admin.site.register(CourseChapter)
admin.site.register(CourseSection)
admin.site.register(Homework)
admin.site.register(PricePolicy)

5. views 逻辑函数 方法一、json.dumps

from django.shortcuts import HttpResponse
from rest_framework.views import APIView
import json from api import models
class CourseView(APIView):
def get(self,request,*args,**kwargs): #方式一:
course_list =list(models.Course.objects.all().values("id","name"))
return HttpResponse(json.dumps(course_list,ensure_ascii=False))

输出结果:

6. views逻辑函数 方法二、 序列化

  创建序列化的文档 course

from rest_framework import serializers

class CourseSerializer(serializers.Serializer):
id = serializers.IntegerField()
name =serializers.CharField()

第二种方式序列化 modelserializer

#序列化方式二,一对一跨表 和一对多跨表,还有多选项(get_xx_display)
class CourseModelSerializer(serializers.ModelSerializer):
level_name =serializers.CharField(source="get_level_display") #choice选项的序列化
hours = serializers.CharField(source="coursedetail.hours") #一对一跨表查询hours字段
course_slogan =serializers.CharField(source="coursedetail.course_slogan")
class Meta:
model =models.Course
fields =["id","name","level_name","hours","course_slogan",]

view视图

from django.shortcuts import HttpResponse
from rest_framework.views import APIView
from api.serializers.course import CourseSerializer
from api import models
class CourseView(APIView):
def get(self,request,*args,**kwargs):
# 方法二:
course_list =models.Course.objects.all()
ser =CourseSerializer(instance=course_list,many=True)
return HttpResponse(ser.data)

输出结果

第三种方法(查询所有Course的API)

from rest_framework.views import APIView
from rest_framework.versioning import URLPathVersioning
from api.serializers.course import CourseSerializer
from api import models
from rest_framework.response import Response
class CourseView(APIView):
def get(self,request,*args,**kwargs):
course_list =models.Course.objects.all()
ser = CourseSerializer(instance=course_list,many =True)
return Response(ser.data)

输出结果:

增加分页功能

from rest_framework.pagination import PageNumberPagination

class CourseView(APIView):
def get(self,request,*args,**kwargs):
#从数据库中获取数据
course_list =models.Course.objects.all()
#分页
page
=PageNumberPagination()
page.paginate_queryset(course_list,request,self)

#序列化
ser = CourseSerializer(instance=course_list,many =True)
return Response(ser.data)

增加异常处理1. :

class CourseView(APIView):
def get(self, request, *args, **kwargs):
response ={"code":1000,"data":None,"error":None}
try:
# 从数据库中获取数据
course_list = models.Course.objects.all()
# 分页
page = PageNumberPagination()
page.paginate_queryset(course_list, request, self)
# 序列化
ser = CourseSerializer(instance=course_list, many=True) response["data"] =ser.data
except Exception as e:
response["code"] =500
response["error"] ="获取数据失败" return Response(response)

 增加异常处理方法2

from django.shortcuts import HttpResponse
from rest_framework.views import APIView
from rest_framework.versioning import URLPathVersioning
from api.serializers.course import CourseSerializer
from rest_framework.pagination import PageNumberPagination
from api import models
from rest_framework.response import Response
from api.utils.response import BaseResponse class CourseView(APIView):
def get(self, request, *args, **kwargs):
# response ={"code":,"data":None,"error":None}
ret =BaseResponse()
try:
# 从数据库中获取数据
course_list = models.Course.objects.all()
# 分页
page = PageNumberPagination()
page.paginate_queryset(course_list, request, self)
# 序列化
ser = CourseSerializer(instance=course_list, many=True) # response["data"] =ser.data
ret.data =ser.data
except Exception as e:
# response["code"] =
ret.code =
# response["error"] ="获取数据失败"
ret.error ="获取数据失败" return Response(ret.dict)

 分页配置(三行代码)

REST_FRAMEWORK ={
'DEFAULT_VERSIONING_CLASS': 'rest_framework.versioning.URLPathVersioning',
'VERSION_PARAM': 'version',
'DEFAULT_VERSION': 'v1',
'ALLOWED_VERSIONS': ['v1', 'v2'],
'PAGE_SIZE': 1
}
class CourseView(APIView):
def get(self, request, *args, **kwargs):
# response ={"code":,"data":None,"error":None}
ret =BaseResponse()
try:
# 从数据库中获取数据
query_set = models.Course.objects.all()
# 分页
page = PageNumberPagination()
course_list=
page.paginate_queryset(query_set, request, self)
# 序列化
ser = CourseModelSerializer(instance=course_list, many=True)
# response["data"] =ser.data
ret.data =ser.data
except Exception as e:
# response["code"] =
ret.code =
# response["error"] ="获取数据失败"
ret.error ="获取数据失败" return Response(ret.dict)

结果:

最后一种方法是 ModelViewSet,但是我们暂时不要用, 那种方式是最简单的,所有的功能都在源码里封装好了,初学者使用APIview进行训练。

 查询某个Course的API

1. url

urlpatterns=[
url(r'courses/$',course.CourseView.as_view()),
url(r'courses/(?P<pk>\d+)',course.CourseDetailView.as_view())
]

view视图

 
from rest_framework.views import APIView
from api.serializers.course import CourseSerializer
from api import models
from rest_framework.response import Response

class CourseDetailView(APIView):
def get(self,request,pk,*args,**kwargs):
course =models.Course.objects.get(id =pk)
ser =CourseSerializer(instance=course)
return Response(ser.data)

输出结果为:

序列化:DegreeCourse表的序列化

from rest_framework import serializers
from api import models
#序列化方式二,一对一跨表 和一对多跨表,还有多选项(get_xx_display)
class DegreeCourseModelSerializer(serializers.ModelSerializer):
name =serializers.CharField()
teachers_name =serializers.SerializerMethodField() # 多对多查询
class Meta:
model =models.Course
fields =["name","teachers_name",] def get_teachers_name(self,row):
teachers_list = row.teachers.all()
return [ {"name":item.name} for item in teachers_list]

 序列化 course表序列化

from rest_framework import serializers
from api import models #序列化方式一
class CourseSerializer(serializers.Serializer):
id = serializers.IntegerField()
name =serializers.CharField() #序列化方式二,一对一跨表 和一对多跨表,还有多选项(get_xx_display)
class CourseModelSerializer(serializers.ModelSerializer):
id = serializers.IntegerField()
name =serializers.CharField()
level_name =serializers.CharField(source="get_level_display") #choice选项的序列化
hours = serializers.CharField(source="coursedetail.hours") #一对一跨表查询hours字段
course_slogan =serializers.CharField(source="coursedetail.course_slogan") # 一对一跨表查询
# recommend_courses1 = serializers.SerializerMethodField()#多对多跨表查询 class Meta:
model =models.Course
# fields =["id","name","level_name","hours","course_slogan",]
fields =["id","name","level_name","hours","course_slogan",]
# fields =["id","name","level_name","hours","course_slogan","recommend_courses1"]
#
# def get_recommend_courses1(self, row):
# recommend_list =row.coursedetail.recommend_courses.all()
# return [ {"id":item.id ,"name":item.name} for item in recommend_list ]

 ORM查询练习

from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.db.models import Q
from django.utils.safestring import mark_safe
from django.db import models
import hashlib # ######################## 课程相关 ######################## class CourseCategory(models.Model):
"""课程大类, e.g 前端 后端..."""
name = models.CharField(max_length=, unique=True) def __str__(self):
return "%s" % self.name class Meta:
verbose_name_plural = "01.课程大类" class CourseSubCategory(models.Model):
"""课程子类, e.g python linux """
category = models.ForeignKey("CourseCategory")
name = models.CharField(max_length=, unique=True) def __str__(self):
return "%s" % self.name class Meta:
verbose_name_plural = "02.课程子类" class DegreeCourse(models.Model):
"""学位课程"""
name = models.CharField(max_length=, unique=True)
course_img = models.CharField(max_length=, verbose_name="缩略图")
brief = models.TextField(verbose_name="学位课程简介", )
total_scholarship = models.PositiveIntegerField(verbose_name="总奖学金(贝里)", default=) #
mentor_compensation_bonus = models.PositiveIntegerField(verbose_name="本课程的导师辅导费用(贝里)", default=)
period = models.PositiveIntegerField(verbose_name="建议学习周期(days)", default=) # 为了计算学位奖学金
prerequisite = models.TextField(verbose_name="课程先修要求", max_length=)
teachers = models.ManyToManyField("Teacher", verbose_name="课程讲师") # 用于GenericForeignKey反向查询, 不会生成表字段,切勿删除
# coupon = GenericRelation("Coupon") # 用于GenericForeignKey反向查询,不会生成表字段,切勿删除
degreecourse_price_policy = GenericRelation("PricePolicy") def __str__(self):
return self.name class Meta:
verbose_name_plural = "03.学位课" class Teacher(models.Model):
"""讲师、导师表"""
name = models.CharField(max_length=)
role_choices = ((, '讲师'), (, '导师'))
role = models.SmallIntegerField(choices=role_choices, default=)
title = models.CharField(max_length=, verbose_name="职位、职称")
signature = models.CharField(max_length=, help_text="导师签名", blank=True, null=True)
image = models.CharField(max_length=)
brief = models.TextField(max_length=) def __str__(self):
return self.name class Meta:
verbose_name_plural = "04.导师或讲师" class Scholarship(models.Model):
"""学位课程奖学金"""
degree_course = models.ForeignKey("DegreeCourse")
time_percent = models.PositiveSmallIntegerField(verbose_name="奖励档位(时间百分比)", help_text="只填百分值,如80,代表80%")
value = models.PositiveIntegerField(verbose_name="奖学金数额") def __str__(self):
return "%s:%s" % (self.degree_course, self.value) class Meta:
verbose_name_plural = "05.学位课奖学金" class Course(models.Model):
"""专题课/学位课模块表"""
name = models.CharField(max_length=, unique=True)
course_img = models.CharField(max_length=)
sub_category = models.ForeignKey("CourseSubCategory")
course_type_choices = ((, '付费'), (, 'VIP专享'), (, '学位课程'))
course_type = models.SmallIntegerField(choices=course_type_choices) # 不为空;学位课的某个模块
# 为空;专题课
degree_course = models.ForeignKey("DegreeCourse", blank=True, null=True, help_text="若是学位课程,此处关联学位表") brief = models.TextField(verbose_name="课程概述", max_length=)
level_choices = ((, '初级'), (, '中级'), (, '高级'))
level = models.SmallIntegerField(choices=level_choices, default=)
pub_date = models.DateField(verbose_name="发布日期", blank=True, null=True)
period = models.PositiveIntegerField(verbose_name="建议学习周期(days)", default=) #
order = models.IntegerField("课程顺序", help_text="从上一个课程数字往后排")
attachment_path = models.CharField(max_length=, verbose_name="课件路径", blank=True, null=True)
status_choices = ((, '上线'), (, '下线'), (, '预上线'))
status = models.SmallIntegerField(choices=status_choices, default=)
template_id = models.SmallIntegerField("前端模板id", default=) # coupon = GenericRelation("Coupon") # 用于GenericForeignKey反向查询,不会生成表字段,切勿删除
price_policy = GenericRelation("PricePolicy") asked_question = GenericRelation("OftenAskedQuestion") def __str__(self):
return "%s(%s)" % (self.name, self.get_course_type_display()) def save(self, *args, **kwargs):
if self.course_type == :
if not self.degree_course:
raise ValueError("学位课程必须关联对应的学位表")
super(Course, self).save(*args, **kwargs) class Meta:
verbose_name_plural = "06.专题课或学位课模块" class CourseDetail(models.Model):
"""课程详情页内容"""
course = models.OneToOneField("Course")
hours = models.IntegerField("课时")
course_slogan = models.CharField(max_length=, blank=True, null=True)
video_brief_link = models.CharField(verbose_name='课程介绍', max_length=, blank=True, null=True)
why_study = models.TextField(verbose_name="为什么学习这门课程")
what_to_study_brief = models.TextField(verbose_name="我将学到哪些内容")
career_improvement = models.TextField(verbose_name="此项目如何有助于我的职业生涯")
prerequisite = models.TextField(verbose_name="课程先修要求", max_length=)
recommend_courses = models.ManyToManyField("Course", related_name="recommend_by", blank=True)
teachers = models.ManyToManyField("Teacher", verbose_name="课程讲师") def __str__(self):
return "%s" % self.course class Meta:
verbose_name_plural = "07.课程或学位模块详细" class OftenAskedQuestion(models.Model):
"""常见问题"""
content_type = models.ForeignKey(ContentType) # 关联course or degree_course
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey('content_type', 'object_id') question = models.CharField(max_length=)
answer = models.TextField(max_length=) def __str__(self):
return "%s-%s" % (self.content_object, self.question) class Meta:
unique_together = ('content_type', 'object_id', 'question')
verbose_name_plural = "08. 常见问题" class CourseOutline(models.Model):
"""课程大纲"""
course_detail = models.ForeignKey("CourseDetail")
title = models.CharField(max_length=)
# 前端显示顺序
order = models.PositiveSmallIntegerField(default=) content = models.TextField("内容", max_length=) def __str__(self):
return "%s" % self.title class Meta:
unique_together = ('course_detail', 'title')
verbose_name_plural = "09. 课程大纲" class CourseChapter(models.Model):
"""课程章节"""
course = models.ForeignKey("Course",related_name='xxxxx') #
chapter = models.SmallIntegerField(verbose_name="第几章", default=)
name = models.CharField(max_length=)
summary = models.TextField(verbose_name="章节介绍", blank=True, null=True)
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True) class Meta:
unique_together = ("course", 'chapter')
verbose_name_plural = "10. 课程章节" def __str__(self):
return "%s:(第%s章)%s" % (self.course, self.chapter, self.name) class CourseSection(models.Model):
"""课时目录"""
chapter = models.ForeignKey("CourseChapter", related_name='coursesections')
name = models.CharField(max_length=)
order = models.PositiveSmallIntegerField(verbose_name="课时排序", help_text="建议每个课时之间空1至2个值,以备后续插入课时")
section_type_choices = ((, '文档'), (, '练习'), (, '视频'))
section_type = models.SmallIntegerField(default=, choices=section_type_choices)
section_link = models.CharField(max_length=, blank=True, null=True, help_text="若是video,填vid,若是文档,填link")
video_time = models.CharField(verbose_name="视频时长", blank=True, null=True, max_length=) # 仅在前端展示使用
pub_date = models.DateTimeField(verbose_name="发布时间", auto_now_add=True)
free_trail = models.BooleanField("是否可试看", default=False) class Meta:
unique_together = ('chapter', 'section_link')
verbose_name_plural = "11. 课时" def __str__(self):
return "%s-%s" % (self.chapter, self.name) class Homework(models.Model):
chapter = models.ForeignKey("CourseChapter")
title = models.CharField(max_length=, verbose_name="作业题目")
order = models.PositiveSmallIntegerField("作业顺序", help_text="同一课程的每个作业之前的order值间隔1-2个数")
homework_type_choices = ((, '作业'), (, '模块通关考核'))
homework_type = models.SmallIntegerField(choices=homework_type_choices, default=)
requirement = models.TextField(max_length=, verbose_name="作业需求")
threshold = models.TextField(max_length=, verbose_name="踩分点")
recommend_period = models.PositiveSmallIntegerField("推荐完成周期(天)", default=)
scholarship_value = models.PositiveSmallIntegerField("为该作业分配的奖学金(贝里)")
note = models.TextField(blank=True, null=True)
enabled = models.BooleanField(default=True, help_text="本作业如果后期不需要了,不想让学员看到,可以设置为False") class Meta:
unique_together = ("chapter", "title")
verbose_name_plural = "12. 章节作业" def __str__(self):
return "%s - %s" % (self.chapter, self.title) # class CourseReview(models.Model):
# """课程评价"""
# enrolled_course = models.OneToOneField("EnrolledCourse")
# about_teacher = models.FloatField(default=, verbose_name="讲师讲解是否清晰")
# about_video = models.FloatField(default=, verbose_name="内容实用")
# about_course = models.FloatField(default=, verbose_name="课程内容通俗易懂")
# review = models.TextField(max_length=, verbose_name="评价")
# disagree_number = models.IntegerField(default=, verbose_name="踩")
# agree_number = models.IntegerField(default=, verbose_name="赞同数")
# tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")
# date = models.DateTimeField(auto_now_add=True, verbose_name="评价日期")
# is_recommend = models.BooleanField("热评推荐", default=False)
# hide = models.BooleanField("不在前端页面显示此条评价", default=False)
#
# def __str__(self):
# return "%s-%s" % (self.enrolled_course.course, self.review)
#
# class Meta:
# verbose_name_plural = "13. 课程评价(购买课程后才能评价)"
#
#
# class DegreeCourseReview(models.Model):
# """学位课程评价
# 为了以后可以定制单独的评价内容,所以不与普通课程的评价混在一起,单独建表
# """
# enrolled_course = models.ForeignKey("EnrolledDegreeCourse")
# course = models.ForeignKey("Course", verbose_name="评价学位模块", blank=True, null=True,
# help_text="不填写即代表评价整个学位课程", limit_choices_to={'course_type': })
# about_teacher = models.FloatField(default=, verbose_name="讲师讲解是否清晰")
# about_video = models.FloatField(default=, verbose_name="视频质量")
# about_course = models.FloatField(default=, verbose_name="课程")
# review = models.TextField(max_length=, verbose_name="评价")
# disagree_number = models.IntegerField(default=, verbose_name="踩")
# agree_number = models.IntegerField(default=, verbose_name="赞同数")
# tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")
# date = models.DateTimeField(auto_now_add=True, verbose_name="评价日期")
# is_recommend = models.BooleanField("热评推荐", default=False)
# hide = models.BooleanField("不在前端页面显示此条评价", default=False)
#
# def __str__(self):
# return "%s-%s" % (self.enrolled_course, self.review)
#
# class Meta:
# verbose_name_plural = "14. 学位课评价(购买课程后才能评价)" class PricePolicy(models.Model):
"""价格与有课程效期表"""
content_type = models.ForeignKey(ContentType) # 关联course or degree_course
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey('content_type', 'object_id') # course = models.ForeignKey("Course")
valid_period_choices = ((, '1天'), (, '3天'),
(, '1周'), (, '2周'),
(, '1个月'),
(, '2个月'),
(, '3个月'),
(, '6个月'), (, '12个月'),
(, '18个月'), (, '24个月'),
)
valid_period = models.SmallIntegerField(choices=valid_period_choices)
price = models.FloatField() class Meta:
unique_together = ("content_type", 'object_id', "valid_period")
verbose_name_plural = "15. 价格策略" def __str__(self):
return "%s(%s)%s" % (self.content_object, self.get_valid_period_display(), self.price)
# a.查看所有学位课并打印学位课名称以及授课老师
 degree_list = DegreeCourse.objects.all().values('name', 'teachers__name')
print("degree_list===>",degree_list)
# 打印结果:
# #degree_list===> <QuerySet [{'name': '外卖骑士', 'teachers__name': 'PY 鱼'}, {'name': '年薪100万', 'teachers__name': 'wusir'}]>
  query_set   = DegreeCourse.objects.all()
for row in query_set:
print(row.name,row.teachers.all())
#结果:外卖骑士 <QuerySet [<Teacher: PY 鱼>]>

# b.查看所有学位课并打印学位课名称以及学位课的奖学金
  degree_list = DegreeCourse.objects.all()
for row in degree_list:
print(row.name)
scholarships = row.scholarship_set.all()
for item in scholarships:
print('------>',item.time_percent,item.value)

输出结果:

外卖骑士
年薪100万
------>

# d. 查看id=1的学位课对应的所有模块名称
obj = DegreeCourse.objects.get(id=)
course_list = obj.course_set.all()
print(course_list) 输出结果:

<QuerySet [<Course: css初始(学位课程)>]>

  course_list = Course.objects.filter(degree_course_id=)
print(course_list) 输出结果:
<QuerySet [<Course: css初始(学位课程)>]>

#  e.获取id = 1的专题课,并打印:课程名、级别(中文)、why_study、what_to_study_brief、所有recommend_courses
# obj = Course.objects.get(id=1)
# print(obj.name)
# print(obj.brief)
# print(obj.get_level_display() )
# print(obj.coursedetail.hours )
# print(obj.coursedetail.why_study )
# print(obj.coursedetail.recommend_courses.all() )

结果:

<QuerySet [{'name': '数据库基本操作'}]>
中级
<QuerySet [{'coursedetail__why_study': '因为少不了外卖'}]>
<QuerySet [{'coursedetail__what_to_study_brief': '怎么闯红灯'}]>
<QuerySet [{'coursedetail__recommend_courses': }, {'coursedetail__recommend_courses': }]>

# f.获取id = 1的专题课,并打印该课程相关的所有常见问题

c_obj = Course.objects.filter(id=).first()
print(c_obj.asked_question.all().values('question'))

    结果:<QuerySet [{'question': '数据库是什么?'}]>
        obj = Course.objects.get(id=)
ask_list = obj.asked_question.all()
for item in ask_list:
print(item.question,item.answer)     结果:

<QuerySet [{'question': '数据库是什么?'}]>
数据库是什么? 数据库(Database)是按照数据结构来组织、存储和管理数据的仓库,它产生于距今六十多年前,随着信息技术和市场的发展,特别是二十世纪九十年代以后,数据管理不再仅仅是存储和管理数据,而转变成用户所

 

# g.获取id = 1的专题课,并打印该课程相关的课程大纲
       # obj = Course.objects.get(id=)
# outline_list = obj.coursedetail.courseoutline_set.all()
# for item in outline_list:
# print(item.title,item.content)
# h.获取id = 1的专题课,并打印该课程相关的所有章节
  obj = Course.objects.get(id=)
chapter_list = obj.xxxxx.all() # 默认obj.表名_set.all()
for item in chapter_list:
print(item.name)

结果:

美丽俏佳人
长发和尚光头尼

# i.获取id = 1的专题课,并打印该课程相关的所有的价格策略
c_obj = Course.objects.filter(id=).first()
print(c_obj.price_policy.all())

结果:

<QuerySet [<PricePolicy: 数据库基本操作(付费)(6个月)666666.0>]>


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