django: how does manytomanyfield with through appear in admin?

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You should use InlineModelAdmin. Docs.

class TeachSubjectInline(admin.TabularInline):
    model = TeachSubject
    extra = 2 # how many rows to show

class SchoolClassAdmin(admin.ModelAdmin):
    inlines = (TeachSubjectInline,)

admin.site.register(SchoolClass, SchoolClassAdmin)

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