【Django】Admin内联显示去掉多余行

Django Admin内联显示去掉多余行

• Django Admin可以设置内联显示，让有外键依赖的Model再同一个页面显示。

# admin.py
# Case为Result的外键
# 相同于 一个Case下，有多个Result

class ResultInline(admin.TabularInline):
    model = Result

class CaseAdmin(admin.ModelAdmin):
    inlines = [ResultInline]

admin.site.register(Case, CaseAdmin)

• 上面的代码，可以让Django Admin管理 Case时，可以显示隶属于该Case的Result。
• 实际运行起来时，发现在Case管理页面，显示Result的部分，会多出几个空白行。而且，这几行没法删除，如果点击Save，会把这几个当成Result，保存进去。
• 修改，将extra设置为0即可。

class ResultInline(admin.TabularInline):
    model = Result
    extra = 0   # 将额外的行设置为0，即可

• 关于extra解释如下
• https://docs.djangoproject.com/en/2.1/ref/contrib/admin/#django.contrib.admin.InlineModelAdmin.extra

InlineModelAdmin.extra
This controls the number of extra forms the formset will display in addition to the initial forms. See the formsets documentation for more information.
For users with JavaScript-enabled browsers, an “Add another” link is provided to enable any number of additional inlines to be added in addition to those provided as a result of the extra argument.
The dynamic link will not appear if the number of currently displayed forms exceeds max_num, or if the user does not have JavaScript enabled.