Django:无法包含ManyToManyField字段，因为手动指定了“通过"模型 [英] Django: can't include the ManyToManyField field because manually specifies a 'through' model

问题描述

我搜索了很多遍，仅找到一种解决方案，以通过第3个模型为具有关系的两个模型添加自定义中间模型.而且我按照建议的方式照常申请，但仍然遇到此问题:

I googled many times and found only one solution to add custom intermediate model for two model having relation through 3rd model. And I applied as usual as suggested but still getting this issue:

不能包含ManyToManyField字段"terms"，因为"terms"手动指定了"through"模型

models.py

class Term(models.Model):
    class Meta:
        db_table = "tbl_term"

    name = models.CharField(max_length=32)

class Post(models.Model):
    class Meta:
        db_table = "tbl_post"

    title = models.CharField(max_length=96)
    content = models.TextField()

    terms = models.ManyToManyField("Term", through="TermRelation")

class TermRelation(models.Model):
    class Meta:
        db_table = "tbl_term_relation"

    term = models.ForeignKey("Term", db_column="id_term")
    post = models.ForeignKey("Post", db_column="id_post")

admin.py

@admin.register(Term)
class AdminTerm(admin.ModelAdmin):
    fieldsets = [
        (None, {'fields': ['name']})
    ]

@admin.register(Post)
class AdminPost(admin.ModelAdmin):
    fieldsets = [
        (None, {'fields':['title', 'content', 'terms']})
    ]

推荐答案

您必须更改管理员以包括

You have to change the admin to include InlineModelAdmin objects

所以，改变

class AdminPost(admin.ModelAdmin):
    fieldsets = [
        (None, {'fields':['title', 'content', 'terms']})
    ]

到

class TermInlineAdmin(admin.TabularInline):
    model = Post.terms.through


class AdminPost(admin.ModelAdmin):
    fieldsets = [
        (None, {'fields':['title', 'content']})
    ]

    inlines = (TermInlineAdmin,)

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