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Django Database Design: ManyToManyField when using Inlines
class Author(models.Model):
    name = models.CharField(max_length=30)
    email = models.EmailField()

class Book(models.Model):
    author = models.ForeignKey(Author)
    title = models.CharField(max_length=50)

class Page(models.Model):
    book = models.ForeignKey(Book)
    contents = models.TextField(max_length=15999)

class Picture(models.Model):
    page = models.ForeignKey(Page) # ideally, this should be many-to-many
    picture_uuid = models.CharField(max_length=36)

class PictureAdmin(admin.ModelAdmin):
    list_display = ('id', 'picture_uuid')

class PictureInline(admin.TabularInline):
    model = Picture

class PageAdmin(admin.ModelAdmin):
    list_display = ('id', 'page_uuid')

    inlines = [
        PictureInline,
        ]

class PageInline(admin.TabularInline):
    model = Page

class BookAdmin(admin.ModelAdmin):
    list_display = ('id', 'title')

    inlines = [
        PageInline,
        ]

class BookInline(admin.TabularInline):
    model = Book

class AuthorAdmin(admin.ModelAdmin):
    list_display = ('id', 'name', 'email')

    inlines = [
        BookInline,
        ]

class PictureInline(admin.TabularInline):
    model = Page.pictures.through

class Page(models.Model):
    ...
    pictures = models.ManyToManyField(Picture)