我正在构建一个非常基本的应用程序(我的第一个Django应用程序) . 我希望用户在数据库中添加一本书 . 所以,我有一个模型,它添加了一本书,以及它的名称和图像(书籍封面) .
这工作得很好 . 现在,我想上传本书的章节,一章将有多个页面,因此有多个文件(比如.pdf文件) . 我为章节创建了另一个类,并通过ForeginKey链接了这个类 .
我在SO,reddit和一些随机博客上查看了一些答案,所有这些似乎都已过时,无论是旧的还是不起作用 .
我正在使用我们在Django中获得的默认管理视图添加所有这些信息 . 我现在不确定如何解决这个问题 . 我不想要多个FileField,因为章节中的页面数是未知的 . 任何提示?
我的models.py是这样的:
from django.db import models
from django import forms
def book_upload_location(instance, filename):
return '{}/{}'.format(instance.book_name, filename)
def book_chapter_upload_location(instance, filename):
# /media/book_Name/Chapter_Number/
return '{}/{}/{}'.format(instance.book.book_name, instance.chapter_number, filename)
class book(models.Model):
book_name = models.CharField(max_length=500)
book_description = models.TextField(max_length=4000)
book_author = models.CharField(max_length=250)
book_genre = models.CharField(max_length=100)
book_image = models.FileField(upload_to=book_upload_location)
def __str__(self):
return str(self.book_name) + " ( " + str(self.pk) + ")"
class bookChapter(models.Model):
book = models.ForeignKey(book, on_delete=models.CASCADE) # Let's delete all the chapters related to a particular book, if book is deleted.
chapter_title = models.CharField(max_length=1000)
chapter_number = models.CharField(max_length=1000)
create_time = models.DateTimeField(auto_now_add=True)
chapter_images = models.FileField(upload_to=book_chapter_upload_location, widget=forms.ClearableFileInput(attrs={'multiple': True}))
def __str__(self):
return str(self.book.book_name) + " - " + " C" + str(self.chapter_number)
编辑:所以,正如@neverwalkaloner建议的那样,我改变了我的代码来做“解决方法”,我收到了新的错误 .
AttributeError: 'bookChapterFiles' object has no attribute 'book'
我的Models.py
来自django.db从django导入表单导入模型
def book_upload_location(instance, filename):
return '{}/{}'.format(instance.book_name, filename)
def book_chapter_upload_location(instance, filename):
return '{}/{}/{}'.format(instance.book.book_name, instance.chapter.chapter_number, filename)
class book(models.Model):
book_name = models.CharField(max_length=500)
book_description = models.TextField(max_length=4000)
book_author = models.CharField(max_length=250)
book_genre = models.CharField(max_length=100)
book_image = models.FileField(upload_to=book_upload_location)
def __str__(self):
return str(self.book_name) + " ( " + str(self.pk) + ")"
class bookChapter(models.Model):
book = models.ForeignKey(book,
on_delete=models.CASCADE) # Let's delete all the chapters related to a particular book, if book is deleted.
print("My book : %s" % book)
chapter_title = models.CharField(max_length=1000)
chapter_number = models.CharField(max_length=1000)
chapter_volume = models.CharField(max_length=1000, default=0)
create_time = models.DateTimeField(auto_now_add=True)
# chapter_images = models.FileField(upload_to=book_chapter_upload_location)
def __str__(self):
return str(self.book.book_name) + " - " + "V" + str(self.chapter_volume) + " C" + str(self.chapter_number)
class bookChapterFiles(models.Model):
chapter = models.ForeignKey(bookChapter, on_delete=models.CASCADE)
chapter_images = models.FileField(upload_to=book_chapter_upload_location)
我的Admin.py:
来自django.contrib导入管理员来自books.models导入书籍,bookChapter,bookChapterFiles
# class PageFileInline(admin.TabularInline):
# model = bookChapter
#
#
# class PageAdmin(admin.ModelAdmin):
# inlines = [PageFileInline, ]
class ChapterInline(admin.TabularInline):
model = bookChapterFiles
class bookAdmin(admin.ModelAdmin):
inlines = [
ChapterInline,
]
admin.site.register(bookChapter, bookAdmin)
admin.site.register(book)
2 回答
您的属性错误似乎来自您对类和属性的命名 . 特别是你的模型书内部章节:
将图书模型的名称更改为“预订”而不是“预订” .
我不确定django将如何处理您的命名约定 . 对我来说,这似乎是问题所在 . 您使用小写字母为“model”和bookChapter的属性“book”建模,并在类中引用它们 . 即使它正在工作,也会令人困惑!
改变这个:
对此:
您应该考虑使用大写字母作为您的 class 名称 . 你打电话给你的书模型“书”,但因为它是一个类,你应该称之为“书” . 书籍模型的属性名称也是多余的 . 将“book_”添加到书籍类的名称,描述和作者字段之前只需要输入“book”两次 . 例如:
它应该是:
尝试使用AdminInline . 你的admin.py应该是这样的:
UPDATE
我认为新错误在
book_chapter_upload_location
函数中 . 你在那里打电话给instance.book
:但bookChapterFiles没有
book
属性 . 尝试改变它: