Django:在成功保存表单后自定义消息 [英] Django: customizing the message after a successful form save

问题描述

每当我在管理界面中保存模型时，它都会显示通常的成功保存消息".但是，我想知道是否可以自定义此消息，因为我想警告用户他刚刚保存的内容以及这些操作的影响.

whenever I save a model in my Admin interface, it displays the usual "successfully saved message." However, I want to know if it's possible to customize this message because I have a situation where I want to warn the user about what he just saved and the implications of these actions.

class PlanInlineFormset(forms.models.BaseInlineFormset):
    def clean(self):
        ### How can I detect the changes?  
        ### (self.changed_data doesn't work because it's an inline)
        ### and display what he/she just changed at the top AFTER the successful save?

class PlanInline(admin.TabularInline):
    model = Plan
    formset = PlanInlineFormset

推荐答案

Django(> 1.2 版)使用消息框架来处理管理消息.您可以使用该界面添加其他消息.举个例子:

Django (> version 1.2) uses the messages framework for admin messages. You can add additional messages using that interface. Here's an example:

from django.contrib import messages

class SomeModelAdmin(admin.ModelAdmin):
    # your normal ModelAdmin stuff goes here

    def save_model(self, request, obj, form, change):
        # add an additional message
        messages.info(request, "Extra message here.")
        super(SomeModelAdmin, self).save_model(request, obj, form, change)

要检测正在保存的对象的更改，您应该覆盖 save_model 方法 ModelAdmin，并将该方法传递的对象与数据库中当前的版本进行比较.要在内联的情况下执行此操作，您可以覆盖 save_formset 方法.一种可能的方法可能看起来像(未经测试的代码):

To detect changes to the object being saved, you should be to override the save_model method of ModelAdmin, and compare the object the method is passed to the version currently in the database. To do this in the case of inlines, you can override the save_formset method. A possible approach might look like (untested code):

class SomeModelAdmin(admin.ModelAdmin):
    # your normal ModelAdmin stuff goes here

    def save_formset(self, request, form, formset, change):
        if not change:
            formset.save()
        else:
            instances = formset.save(commit=False)

            for instance in instances:
                try:
                    # if you've got multiple types of inlines
                    # make sure your fetching from the 
                    # appropriate model type here
                    old_object = SomeOtherModel.get(id=instance.id)
                except SomeOtherModel.DoesNotExist:
                    continue

                if instance.field_x != old_object.field_x:
                    messages.info(request, "Something Changed")

            instance.save()

        formset.save_m2m()

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