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day81:luffy:课程分类页面&课程信息页面&指定分类显示课程信息&分页显示课程信息

1.构建课程前端初始页面

1.创建Course.Vue,并将初始样式代码放入vue文件中

2.为course组件配置路由，用来做前端访问用的

router/index.js

import Vue from 'vue'
import Router from 'vue-router'
import Course from "@/components/Course"

Vue.use(Router)

export default new Router({
  mode:'history',
  routes: [
    ......
    {
      path: '/course',
      component: Course,
    }
  ]
})

2.course后端的准备工作

1.在app下创建子应用course

python3 ../../manage.py startapp course

2.注册course应用

INSTALLED_APPS = [
        ...
    'course',
]

3.设计课程表结构

models.py

from django.db import models
from luffyapi.utils.models import BaseModel
# Create your models here.
class CourseCategory(BaseModel):
    """
    课程分类
    """
    name = models.CharField(max_length=64, unique=True, verbose_name="分类名称")
    class Meta:
        db_table = "ly_course_category"
        verbose_name = "课程分类"
        verbose_name_plural = "课程分类"


    def __str__(self):
        return "%s" % self.name



class Course(BaseModel):
    """
    专题课程
    """
    course_type = (
        (0, '付费'),
        (1, 'VIP专享'),
        (2, '学位课程')
    )
    level_choices = (
        (0, '初级'),
        (1, '中级'),
        (2, '高级'),
    )
    status_choices = (
        (0, '上线'),
        (1, '下线'),
        (2, '预上线'),
    )
    name = models.CharField(max_length=128, verbose_name="课程名称")
    course_img = models.ImageField(upload_to="course", max_length=255, verbose_name="封面图片", blank=True, null=True)
    
    #费用类型字段是为了后期一些其他功能拓展用的，现在可以先不用，或者去掉它，目前我们项目用不到
    course_type = models.SmallIntegerField(choices=course_type,default=0, verbose_name="付费类型")
    # 这个字段是课程详情页里面展示的，并且详情介绍里面用户将来可能要上传一些图片之类的，所以我们会潜入富文本编辑器，让用户填写数据的时候可以上传图片啊、写标题啊、css、html等等内容
    brief = models.TextField(max_length=2048, verbose_name="详情介绍", null=True, blank=True)
    
    level = models.SmallIntegerField(choices=level_choices, default=1, verbose_name="难度等级")
    pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)
    period = models.IntegerField(verbose_name="建议学习周期(day)", default=7)
    
    #课件资料的存放路径
    attachment_path = models.FileField(max_length=128, verbose_name="课件路径", blank=True, null=True)
    status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="课程状态")
    course_category = models.ForeignKey("CourseCategory", on_delete=models.CASCADE, null=True, blank=True,verbose_name="课程分类")
    students = models.IntegerField(verbose_name="学习人数",default = 0)
    lessons = models.IntegerField(verbose_name="总课时数量",default = 0)
    
    #总课时数量可能10个，但是目前之更新了3个，就跟小说、电视剧连载似的。
    pub_lessons = models.IntegerField(verbose_name="课时更新数量",default = 0)
    
    #课程原价
    price = models.DecimalField(max_digits=6,decimal_places=2, verbose_name="课程原价",default=0)
    teacher = models.ForeignKey("Teacher",on_delete=models.DO_NOTHING, null=True, blank=True,verbose_name="授课老师")
    class Meta:
        db_table = "ly_course"
        verbose_name = "专题课程"
        verbose_name_plural = "专题课程"

    def __str__(self):
        return "%s" % self.name



class Teacher(BaseModel):
    """讲师、导师表"""
    role_choices = (
        (0, '讲师'),
        (1, '导师'),
        (2, '班主任'),
    )
    name = models.CharField(max_length=32, verbose_name="讲师title")
    role = models.SmallIntegerField(choices=role_choices, default=0, verbose_name="讲师身份")
    title = models.CharField(max_length=64, verbose_name="职位、职称")
    signature = models.CharField(max_length=255, verbose_name="导师签名", help_text="导师签名", blank=True, null=True)
    image = models.ImageField(upload_to="teacher", null=True, verbose_name = "讲师封面")
    brief = models.TextField(max_length=1024, verbose_name="讲师描述")

    class Meta:
        db_table = "ly_teacher"
        verbose_name = "讲师导师"
        verbose_name_plural = "讲师导师"

    def __str__(self):
        return "%s" % self.name


class CourseChapter(BaseModel):
    """课程章节"""
    course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE, verbose_name="课程名称")
    chapter = models.SmallIntegerField(verbose_name="第几章", default=1)
    name = models.CharField(max_length=128, verbose_name="章节标题")
    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:
        db_table = "ly_course_chapter"
        verbose_name = "课程章节"
        verbose_name_plural = "课程章节"

    def __str__(self):
        return "%s:(第%s章)%s" % (self.course, self.chapter, self.name)


class CourseLesson(BaseModel):
    """课程课时"""
    section_type_choices = (
        (0, '文档'),
        (1, '练习'),
        (2, '视频')
    )
    chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE,verbose_name="课程章节")
    name = models.CharField(max_length=128,verbose_name = "课时标题")
    #orders = models.PositiveSmallIntegerField(verbose_name="课时排序") #在basemodel里面已经有了排序了
    section_type = models.SmallIntegerField(default=2, choices=section_type_choices, verbose_name="课时种类")
    section_link = models.CharField(max_length=255, blank=True, null=True, verbose_name="课时链接", help_text = "若是video，填vid,若是文档，填link")
    duration = models.CharField(verbose_name="视频时长", blank=True, null=True, max_length=32)  # 仅在前端展示使用，所以直接让上传视频的用户直接填写时长进来就可以了。
    pub_date = models.DateTimeField(verbose_name="发布时间", auto_now_add=True)
    free_trail = models.BooleanField(verbose_name="是否可试看", default=False)
    course = models.ForeignKey('Course',related_name='course_lesson',verbose_name='课程',on_delete=models.CASCADE,null=True,blank=True)
    is_show_list = models.BooleanField(verbose_name='是否推荐到课程列表',default=False)
        lesson = models.IntegerField(verbose_name="第几课时")
    class Meta:
        db_table = "ly_course_lesson"
        verbose_name = "课程课时"
        verbose_name_plural = "课程课时"

    def __str__(self):
        return "%s-%s" % (self.chapter, self.name)

4.执行数据库迁移

python manage.py makemigrations
python manage.py migrate

5.把当前新增的课程模型注册到xadmin里面.

courses/adminx.py

import xadmin

from .models import CourseCategory
class CourseCategoryModelAdmin(object):
    """课程分类模型管理类"""
    pass
xadmin.site.register(CourseCategory, CourseCategoryModelAdmin)


from .models import Course
class CourseModelAdmin(object):
    """课程模型管理类"""
    pass
xadmin.site.register(Course, CourseModelAdmin)


from .models import Teacher
class TeacherModelAdmin(object):
    """老师模型管理类"""
    pass
xadmin.site.register(Teacher, TeacherModelAdmin)


from .models import CourseChapter
class CourseChapterModelAdmin(object):
    """课程章节模型管理类"""
    pass
xadmin.site.register(CourseChapter, CourseChapterModelAdmin)



from .models import CourseLesson
class CourseLessonModelAdmin(object):
    """课程课时模型管理类"""
    pass
xadmin.site.register(CourseLesson, CourseLessonModelAdmin)

3.后端实现课程分类列表接口

1.添加课程分类的测试数据

INSERT INTO `ly_course_category` (`id`,`orders`,`is_show`,`is_deleted`,`created_time`,`updated_time`,`name`)
 VALUES
(1,11,1,0,'2019-08-13 07:08:47.100074','2019-08-13 07:44:05.903782','python'),
(2,0,1,0,'2019-08-13 07:08:51.451093','2019-08-13 07:43:54.558940','go编程'),
(3,3,1,0,'2019-08-13 07:08:57.390196','2019-08-13 07:08:57.390226','Linux运维'),
(4,4,1,0,'2019-08-13 07:09:11.465963','2019-08-13 07:09:11.465994','前端开发'),(5,11,1,0,'2019-08-13 07:08:47.100074','2019-08-13 07:44:05.903782','php编程'),(6,0,1,0,'2019-08-13 07:08:51.451093','2019-08-13 07:43:54.558940','C/C++'),(7,3,1,0,'2019-08-13 07:08:57.390196','2019-08-13 07:08:57.390226','java web'),(8,4,1,0,'2019-08-13 07:09:11.465963','2019-08-13 07:09:11.465994','UI设计'),(9,11,1,0,'2019-08-13 07:09:11.465963','2019-08-13 07:09:11.465994','语文'),(10,145,2,0,'2019-08-13 07:09:11.465963','2019-08-13 07:09:11.465994','数学'),(11,1,2,0,'2019-08-13 07:09:11.465963','2019-08-13 07:09:11.465994','英语');

2.为课程分类添加后端接口的路由,并编写视图函数和序列化器

urls.py

from django.urls import path
from . import views

urlpatterns = [
    path(r'categorys/', views.CategoryView.as_view(),),

]

views.py

from . import models
# Create your views here.
from rest_framework.generics import ListAPIView
from .serializers import CourseCategoryModelSerializer, CourseModelsSerializer


class CategoryView(ListAPIView):

    queryset = models.CourseCategory.objects.filter(is_deleted=False,is_show=True)
    serializer_class = CourseCategoryModelSerializer

serializers.py

from rest_framework import serializers
from . import models
class CourseCategoryModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.CourseCategory
        fields = ['id', 'name']

lyapi/urls.py

urlpatterns = [
    ......
    path(r'course/',include('course.urls')),

]

访问后端接口 /course/categorys 可查到分类数据

4.前端发送请求-获取课程分类信息

course.vue

<!-- html -->
 <ul class="cate-list">
          <li class="title">课程分类:</li>
          <!-- 点击不同分类进行高亮效果的切换 --> 
          <li :class="{this:category===0}" @click="category=0">全部</li>
          <li v-for="(value, index) in category_list" :key="value.id" @click="category=value.id" :class="{this:category===value.id}">{{value.name}}</li>   
        </ul>

// js
<script>
    
  import Vheader from "./common/Vheader"
  import Footer from "./common/Footer"
  export default {
      name: "Course",
      data(){
        return{
          category:0,  //默认分类zhi
          category_list:[],
        }
      },
      components:{
        Vheader,
        Footer,
      },

      created() {
        this.$axios.get(`${this.$settings.Host}/course/categorys/`)
        .then((res)=>{
          console.log(res.data);
          this.category_list = res.data;
        })
      }


  }
</script>

此时在前端就可以看到课程分类的效果了

5.后端实现课程列表信息的接口

urls.py

from django.urls import path
from . import views

urlpatterns = [
    ......
    path(r'courses/', views.CourseView.as_view(),),

]

views.py

from .serializers import CourseModelSerializer
class CourseListAPIView(ListAPIView):
    queryset = Course.objects.filter(is_delete=False, is_show=True).order_by("orders")
    serializer_class = CourseModelSerializer

添加一些测试数据

INSERT INTO `ly_teacher` (`id`,`orders`,`is_show`,`is_deleted`,`created_time`,`updated_time`,`name`,`role`,`title`,`signature`,`image`,`brief`)
VALUES 
(1,1,1,0,'2019-08-13 07:13:01.531992','2019-08-13 07:13:01.532043','李老师',0,'xx公司技术总监','洪七公','teacher/logo2x.png','222');

INSERT INTO `ly_course`
(`id`,`orders`,`is_show`,`is_deleted`,`created_time`,`updated_time`,`name`,`course_img`,`course_type`,`brief`,`level`,`pub_date`,`period`,`attachment_path`,`status`,`students`,`lessons`,`pub_lessons`,`price`,`course_category_id`,`teacher_id`)
VALUES
(1,1,1,0,'2019-08-13 07:13:50.678948','2019-08-15 04:07:11.386224','flask框架','course/Loginbg.3377d0c.jpg',0,'<p>xxxx</p>',1,'2019-08-13',7,'README.md',0,99,110,110,1110.00,1,1),
(2,2,1,0,'2019-08-13 07:15:32.490163','2019-08-15 04:13:22.430368','蘑菇街APP','course/course-cover.jpeg',0,'<p>dxxx</p>',2,'2019-08-13',7,'logo.svg',0,10,50,40,666.00,1,1),
(3,3,1,0,'2019-08-13 07:15:32.490163','2019-08-20 10:49:41.880490','django框架','course/2.jpeg',0,'<p>dxxx</p>',1,'2019-08-13',7,'logo.svg',0,10,50,40,330.00,1,1),
(15,4,1,0,'2019-08-13 07:15:32.490163','2019-08-13 07:15:32.490191','python入门','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,411.00,1,1),
(16,5,1,0,'2019-08-13 07:15:32.490163','2019-08-14 02:28:04.791112','hbase入门','course/2.jpeg',0,'dxxx',1,'2019-08-13',7,'logo.svg',0,10,50,40,400.00,7,1),
(17,6,1,0,'2019-08-13 07:15:32.490163','2019-08-13 07:15:32.490191','路飞学城项目实战','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,899.00,1,1),
(18,7,1,0,'2019-08-13 07:15:32.490163','2019-08-14 02:29:47.667133','负载均衡','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,1088.00,6,1),
(19,8,1,0,'2019-08-13 07:15:32.490163','2019-08-13 07:15:32.490191','MVC','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,1500.00,1,1),
(20,9,1,0,'2019-08-13 07:15:32.490163','2019-08-14 02:28:52.126968','21天java入门','course/2.jpeg',0,'dxxx',0,'2019-08-13',7,'logo.svg',0,10,50,40,3000.00,7,1),
(21,10,1,0,'2019-08-13 07:15:32.490163','2019-08-14 02:27:01.850049','7天玩转Linux运维','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,400.00,3,1),
(22,11,1,0,'2019-08-13 07:15:32.490163','2019-08-13 07:15:32.490191','15天掌握flask框架','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,400.00,1,1),
(23,12,1,0,'2019-08-13 07:15:32.490163','2019-08-13 07:23:56.015167','C编程嵌入式','course/2.jpeg',0,'dxxx',1,'2019-08-13',7,'logo.svg',0,10,50,40,399.00,3,1),
(24,13,1,0,'2019-08-13 07:15:32.490163','2019-08-14 02:29:17.872840','3天玩转树莓派','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,400.00,3,1),
(25,14,1,0,'2019-08-13 07:15:32.490163','2019-08-14 02:28:30.783768','MongoDB','course/2.jpeg',0,'dxxx',0,'2019-08-13',7,'logo.svg',0,10,50,40,400.00,3,1),
(26,15,1,0,'2019-08-13 07:15:32.490163','2019-08-14 02:30:09.348192','Beego框架入门','course/2.jpeg',0,'dxxx',1,'2019-08-13',7,'logo.svg',0,10,50,40,699.00,2,1),
(27,16,1,0,'2019-08-13 07:15:32.490163','2019-08-15 02:35:20.997672','beego框架进阶','course/2.jpeg',0,'<p>dxxx</p>',1,'2019-08-13',7,'logo.svg',0,10,50,50,400.00,2,1),
(28,17,1,0,'2019-08-13 07:15:32.490163','2019-08-13 07:23:44.546598','以太坊入门','course/2.jpeg',0,'dxxx',2,'2019-08-13',7,'logo.svg',0,10,50,40,899.00,2,1),
(29,18,1,0,'2019-08-13 07:15:32.490163','2019-08-15 04:05:10.421736','负载均衡','course/2.jpeg',0,'<div style="background:#eeeeee; border:1px solid #cccccc; padding:5px 10px"><span style="color:#16a085"><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:28px"><span style="background-color:#f39c12">dxxx</span></span></span></span><img alt="" src="/media/2019/08/15/course-cover.jpeg" /></div>

<div style="background:#eeeeee; border:1px solid #cccccc; padding:5px 10px">&nbsp;</div>

<div style="background:#eeeeee; border:1px solid #cccccc; padding:5px 10px">
<table border="1" cellpadding="1" cellspacing="1" style="500px">
    <tbody>
        <tr>
            <td>12321</td>
            <td>3232</td>
            <td>111</td>
        </tr>
        <tr>
            <td>33</td>
            <td>33</td>
            <td>22</td>
        </tr>
        <tr>
            <td>11</td>
            <td>22</td>
            <td>23</td>
        </tr>
    </tbody>
</table>

<p>&nbsp;</p>
</div>',0,'2019-08-13',7,'logo.svg',0,10,50,40,400.00,3,1);

serializers.py

from rest_framework import serializers
from . import models


class CourseCategoryModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.CourseCategory
        fields = ['id', 'name']


class TeacherModelSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Teacher
        fields = ['name', 'role','title','signature']


class CourseModelsSerializer(serializers.ModelSerializer):
    # teacher_name = serializers.CharField(source='teacher.name')  #自定义字段，通过sourse关键字就能获取外键关联的指定字段数据，别忘了在fields里面指定一下
    # 方式2
    # 序列化器嵌套
    teacher = TeacherModelSerializer()  #将外键关联的属性指定为关联表的序列化器对象，就能拿到关联表序列化出来的所有数据，还需要在fields中指定一下，注意，名称必须和外键属性名称相同


    class Meta:
        model = models.Course
        # fields = ["id","name","course_img","students","lessons","pub_lessons","price","teacher",'teacher_name']  #teacher外键属性默认拿的是id值
        fields = ["id","name","course_img","students","lessons","pub_lessons","price","teacher","get_lessons"]  #teacher外键属性默认拿的是id值

如何通过课程找到课时

models.py

class Course(BaseModel):
    
    ......
    class Meta:
        db_table = "ly_course"
        verbose_name = "专题课程"
        verbose_name_plural = "专题课程"

    def __str__(self):
        return "%s" % self.name

    def lesson_list(self):
        """获取当前课程的前8个课时展示到列表中"""

        # 获取所有章节
        chapters_list = self.coursechapters.filter(is_delete=False,is_show=True)
        lesson_list = [] # 课时列表
        if chapters_list: 
            for chapter in chapters_list:
                lessons = chapter.coursesections.filter(is_delete=False,is_show=True)[:4]
                if lessons:
                    for lesson in lessons:
                        lesson_list.append({
                            "id":lesson.id,
                            "name":lesson.name,
                            "free_trail":lesson.free_trail
                        })

        return lesson_list[:4]

序列化器字段增加自定义的模型字段

class CourseModelSerializer(serializers.ModelSerializer):

    # 默认情况,序列化器转换模型数据时,默认会把外键直接转成主键ID值
    # 所以我们需要重新设置在序列化器中针对外键的序列化
    # 这种操作就是一个序列器里面调用另一个序列化器了.叫"序列化器嵌套"


    teacher = TeacherModelSerializer()
    # coursechapters = CourseChapterModelSerializer(many=True)
    class Meta:
        model = Course
        fields = ("id","name","course_img","students","lessons","pub_lessons","price","teacher","lesson_list")

6.前端显示列表课程信息

<!-- html -->  
<div class="course-list">
        <div class="course-item" v-for="(course, courseindex) in course_list">
          <div class="course-image">

            <img :src="course.course_img" alt="">

          </div>
          <div class="course-info">
            <h3><router-link to="">{{course.name}}</router-link> <span><img src="/static/img/avatar1.svg" alt="">{{course.students}}人已加入学习</span></h3>
            <p class="teather-info">{{course.teacher.name}} {{course.teacher.signature}} {{course.teacher.title}} <span>共{{course.lessons}}
              课时/{{course.lessons===course.pub_lessons? '更新完成':`已更新${course.pub_lessons}课时`}}</span></p>
            <ul class="lesson-list">
              <li v-for="(lesson, lessonindex) in course.get_lessons" :key="lessonindex"><span class="lesson-title">0{{lessonindex+1}} | 第{{lesson.lesson}}节：{{lesson.name}}</span><span v-show="lesson.free_trail" class="free">免费</span></li>

            </ul>
            <div class="pay-box">
              <span class="discount-type">限时免费</span>
              <span class="discount-price">￥0.00元</span>
              <span class="original-price">原价：{{course.price}}元</span>
              <span class="buy-now">立即购买</span>
            </div>
          </div>
        </div>

// js
<script>
  export default {
      name: "Course",
      data(){
        return{
          course_list:[],
        }
      },
      created() {
        this.get_course();
      },
      methods:{
          
        // 获取课程列表数据
        get_course(){
          this.$axios.get(`${this.$settings.Host}/course/courses/`,{
            params:this.fitlers,
          })
          .then((res)=>{
            this.total = res.data.count
            this.course_list = res.data.results;
          })
        }
      }

  }
</script>

7.按照指定分类显示课程信息

1.安装字段过滤排序

pip install django-filter

2.在settings/dev.py配置文件中增加过滤后端的设置

INSTALLED_APPS = [
    ...
    'django_filters',  # 需要注册应用，
]

3.在视图中设置允许过滤的字段名和引入过滤字段核心类

from .serializers import CourseModelSerializer
from django_filters.rest_framework import DjangoFilterBackend
class CourseAPIView(ListAPIView):
    queryset = Course.objects.filter(is_delete=False, is_show=True).order_by("orders")
    serializer_class = CourseModelSerializer
    filter_backends = [DjangoFilterBackend, ]
    filter_fields = ('course_category',)

drf测试接口:course/courses/?course_category=1

可以看到分类为1的所有课程信息

4.前端显示

<script>
  import Vheader from "./common/Vheader"
  import Footer from "./common/Footer"
  export default {
      name: "Course",
      data(){
        return{
          category:0,  //默认分类值为0 全部
          category_list:[],
          course_list:[],
          fitlers:{},
          total:0
        }
      },
      components:{
        Vheader,
        Footer,
      },

      created() {
        this.get_categorys();
        this.get_course();

      },
      watch:{

        category(){
          if (this.category>0){
            this.fitlers['course_category'] = this.category;
          }else {
            this.fitlers={}
          }

          //console.log('>>>>>',this.fitlers)
          this.get_course(); // 当分类数据发生变化时，触发获取数据的动作
        }
      },
        // 获取所有分类数据
        get_categorys(){
          this.$axios.get(`${this.$settings.Host}/course/categorys/`)
        .then((res)=>{
          //console.log(res.data);
          this.category_list = res.data;
        })
        },

        // 获取课程列表数据
        get_course(){
          this.$axios.get(`${this.$settings.Host}/course/courses/`,{
            params:this.fitlers,
          })
          .then((res)=>{
            //console.log(res.data);
            this.total = res.data.count
            this.course_list = res.data.results;
          })
        }
      }


  }
</script>

8.分页显示课程信息

1.前端

<template>
     .....
      <!-- 分页效果展示 -->
      <el-pagination
        background
        :page-size="2"
        layout="prev, pager, next, sizes,jumper"
        :page-sizes="[2, 5,  10, 15, 20]"
        @current-change="handleCurrentChange"
        @size-change="handleSizeChange"
        :total="total">
      </el-pagination>

    </div>
    <Footer></Footer>
  </div>
</template>

<script>
  import Vheader from "./common/Vheader"
  import Footer from "./common/Footer"
  export default {
      name: "Course",
      data(){
       
        }
      },
      components:{
       
      },

      created() {
     
      },
          
      },
      methods:{
        handleSizeChange(val){
          this.fitlers['size'] = val
          // console.log(val);
          this.get_course();
        },
        handleCurrentChange(val){
          this.fitlers['page'] = val
          // console.log(val);
          this.get_course();
        },

        // 获取所有分类数据
        get_categorys(){
        
        })
        },

        // 获取课程列表数据
        get_course(){
            
          })
        }
      }


  }
</script>

2.后端

pagenation.py

from rest_framework.pagination import PageNumberPagination
class StandardPageNumberPagination(PageNumberPagination):
    # 默认每一页显示的数据量
    page_size = 2
    # 允许客户端通过get参数来控制每一页的数据量
    page_size_query_param = "size"
    max_page_size = 10  #客户端通过size指定获取数据的条数时,最大不能超过多少

views.py

from django.shortcuts import render


from .pagenations import StandardPageNumberPagination

# 加过滤
class CourseView(ListAPIView):
    ......
    pagination_class = StandardPageNumberPagination

drf接口调试

course/courses/?page=1

course/courses/?page=1&size=5

查看全文

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原文地址：https://www.cnblogs.com/libolun/p/13922948.html

day81:luffy:课程分类页面&课程信息页面&指定分类显示课程信息&分页显示课程信息

目录

1.构建课程前端初始页面

2.course后端的准备工作

3.后端实现课程分类列表接口

4.前端发送请求-获取课程分类信息

5.后端实现课程列表信息的接口

如何通过课程找到课时

序列化器字段增加自定义的模型字段

6.前端显示列表课程信息

7.按照指定分类显示课程信息

1.安装字段过滤排序

2.在settings/dev.py配置文件中增加过滤后端的设置

3.在视图中设置允许过滤的字段名和引入过滤字段核心类

4.前端显示

8.分页显示课程信息

1.前端

2.后端