課程表分析

course/models.py

from django.db import models

# Create your models here.
# class Course(models.Model):
#     name = models.CharField(max_length=64)
#     title = models.CharField(max_length=64)
#     level = models.IntegerField(choices=((0, '入門'), (1, '進階')), default=0)
#     detail = models.TextField()  # 可以關聯詳情表
 

#     type = models.IntegerField(choices=((0, 'Python'), (1, 'Linux')), default=0)
#     is_show = models.BooleanField(default=False)
#
#     # 優化欄位
#     # 記錄學習課程的學生人數
#     students = models.IntegerField(default=0)
#     # time課程總學時
#     time = models.IntegerField(default=0)
#
#     class Meta:
#         abstract = True
 

#
#
# # 免費課
# class FreeCourse(Course):
#     image = models.ImageField(upload_to='course/free')
#     attachment = models.FileField(upload_to='attachment')
#
#
# # 實戰課
# class ActualCourse(Course):
#     image = models.ImageField(upload_to='course/actual')
#     price = models.DecimalField(max_digits=7, decimal_places=2)
 

#     # cost = models.DecimalField(max_digits=7, decimal_places=2)
#
#
# # 輕課
# class LightCourse(Course):
#     image = models.ImageField(upload_to='course/light')
#     price = models.DecimalField(max_digits=7, decimal_places=2)
#     # cost = models.DecimalField(max_digits=7, decimal_places=2)
#     period = models.IntegerField(verbose_name='學習建議週期(month)', default=0)

# 評論表：分三個表、(id，ctx，date，user_id，free_course_id, comment_id)
# 老師表：在課程表建立多對一外來鍵
# 章節表：在章節表建立多對一外來鍵關聯課程
# 課時表：在課時表建立多對一外來鍵關聯章節

from luffyapi.utils.models import BaseModel


# 實際luffy中的表，免費課的
class CourseCategory(BaseModel):
    """
    課程分類
    python,linux,go, 網路安全
    跟課程是一對多的關係
    """
    name = models.CharField(max_length=64, unique=True, verbose_name="分類名稱")

    class Meta:
        db_table = "luffy_course_category"
        verbose_name = "分類"
        verbose_name_plural = verbose_name

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


class Course(BaseModel):
    """課程"""
    course_type = (
        (0, '付費'),
        (1, 'VIP專享'),
        (2, '學位課程')
    )
    level_choices = (
        (0, '初級'),
        (1, '中級'),
        (2, '高階'),
    )
    status_choices = (
        (0, '上線'),
        (1, '下線'),
        (2, '預上線'),
    )
    # 原始欄位
    name = models.CharField(max_length=128, verbose_name="課程名稱")
    course_img = models.ImageField(upload_to="courses", max_length=255, verbose_name="封面圖片", blank=True, null=True)
    course_type = models.SmallIntegerField(choices=course_type, default=0, verbose_name="付費型別")
    # 使用這個欄位的原因
    brief = models.TextField(max_length=2048, verbose_name="詳情介紹", null=True, blank=True)
    level = models.SmallIntegerField(choices=level_choices, default=0, verbose_name="難度等級")
    pub_date = models.DateField(verbose_name="釋出日期", auto_now_add=True)
    period = models.IntegerField(verbose_name="建議學習週期(day)", default=7)
    attachment_path = models.FileField(upload_to="attachment", max_length=128, verbose_name="課件路徑", blank=True,
                                       null=True)
    status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="課程狀態")
    price = models.DecimalField(max_digits=6, decimal_places=2, verbose_name="課程原價", default=0)

    # 優化欄位
    students = models.IntegerField(verbose_name="學習人數", default=0)
    sections = models.IntegerField(verbose_name="總課時數量", default=0)
    pub_sections = models.IntegerField(verbose_name="課時更新數量", default=0)

    # 關聯欄位
    teacher = models.ForeignKey("Teacher", on_delete=models.DO_NOTHING, null=True, blank=True, verbose_name="授課老師",
                                db_constraint=False)
    course_category = models.ForeignKey("CourseCategory", on_delete=models.SET_NULL, db_constraint=False, null=True,
                                        blank=True, verbose_name="課程分類")

    class Meta:
        db_table = "luffy_course"
        verbose_name = "課程"
        verbose_name_plural = "課程"

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

    @property
    def course_type_name(self):
        return self.get_course_type_display()

    @property
    def level_name(self):
        return self.get_level_display()

    @property
    def status_name(self):
        return self.get_status_display()

    @property
    def section_list(self):
        ll = []
        # 根據課程取出所有章節（正向查詢，欄位名.all()）
        course_chapter_list = self.coursechapters.all()
        for course_chapter in course_chapter_list:
            # 通過章節物件，取到章節下所有的課時（反向查詢）
            # course_chapter.表名小寫_set.all() 現在變成了course_chapter.coursesections.all()
            course_sections_list = course_chapter.coursesections.all()
            for course_section in course_sections_list:
                ll.append({
                    'name': course_section.name,
                    'section_link': course_section.section_link,
                    'duration': course_section.duration,
                    'free_trail': course_section.free_trail,
                })
                if len(ll) >= 4:
                    return ll

        return ll


class Teacher(BaseModel):
    """
    導師
    跟課程一對多，關聯欄位寫在課程表中
    """
    role_choices = (
        (0, '講師'),
        (1, '導師'),
        (2, '班主任'),
    )
    name = models.CharField(max_length=32, verbose_name="導師名")
    role = models.SmallIntegerField(choices=role_choices, default=0, verbose_name="導師身份")
    title = models.CharField(max_length=64, verbose_name="職位、職稱")
    signature = models.CharField(max_length=255, verbose_name="導師簽名", help_text="導師簽名", blank=True, null=True)
    image = models.ImageField(upload_to="teacher", null=True, verbose_name="導師封面")
    brief = models.TextField(max_length=1024, verbose_name="導師描述")

    class Meta:
        db_table = "luffy_teacher"
        verbose_name = "導師"
        verbose_name_plural = verbose_name

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

    def role_name(self):
        # 返回角色的中文
        return self.get_role_display()


class CourseChapter(BaseModel):
    """
    章節
    章節跟課程是一（課程）對多（章節多）
    """
    course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE, verbose_name="課程名稱",
                               db_constraint=False)
    chapter = models.SmallIntegerField(verbose_name="第幾章", default=1)
    name = models.CharField(max_length=128, verbose_name="章節標題")
    summary = models.TextField(verbose_name="章節介紹", blank=True, null=True)
    pub_date = models.DateField(verbose_name="釋出日期", auto_now_add=True)

    class Meta:
        db_table = "luffy_course_chapter"
        verbose_name = "章節"
        verbose_name_plural = verbose_name

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


class CourseSection(BaseModel):
    """
    課時
        章節和課時是一對多的關係，關聯欄位寫在多的一方，課時
    """
    section_type_choices = (
        (0, '文件'),
        (1, '練習'),
        (2, '視訊')
    )
    chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE,
                                verbose_name="課程章節", db_constraint=False)
    name = models.CharField(max_length=128, verbose_name="課時標題")
    orders = models.PositiveSmallIntegerField(verbose_name="課時排序")
    section_type = models.SmallIntegerField(default=2, choices=section_type_choices, verbose_name="課時種類")
    section_link = models.CharField(max_length=255, blank=True, null=True, verbose_name="課時連結",
                                    help_text="若是video，填vid,若是文件，填link")
    duration = models.CharField(verbose_name="視訊時長", blank=True, null=True, max_length=32)  # 僅在前端展示使用
    pub_date = models.DateTimeField(verbose_name="釋出時間", auto_now_add=True)
    free_trail = models.BooleanField(verbose_name="是否可試看", default=False)

    class Meta:
        db_table = "luffy_course_Section"
        verbose_name = "課時"
        verbose_name_plural = verbose_name

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

基表utils/models.py

from django.db import models


# 後期課程表，輪播圖表，都會用到這些欄位

class BaseModel(models.Model):
    is_delete = models.BooleanField(default=False, verbose_name='是否刪除')
    is_show = models.BooleanField(default=True, verbose_name='是否展示')
    created_time = models.DateTimeField(auto_now_add=True, verbose_name='建立時間')
    updated_time = models.DateTimeField(auto_now=True, verbose_name='最後更新時間')
    orders = models.IntegerField()

    class Meta:
        abstract = True  # 一定不要忘了

資料遷移

# python manage.py makemigrations
# python manage.py migrate

註冊models：course/adminx.py

import xadmin
from . import models

xadmin.site.register(models.CourseCategory)
xadmin.site.register(models.Course)
xadmin.site.register(models.Teacher)
xadmin.site.register(models.CourseChapter)
xadmin.site.register(models.CourseSection)