内联模型形式发出post_save信号？ （django的） [英] Do inline model forms emmit post_save signals? (django)

问题描述

所以我有一个ForeignKey相关的两个模型（表）。在管理员中，编辑页面显示第一个模型（也就是说ModelOne）以及第二个模型ModelTwo（TabularInline）的相关实例。

我想要的是在更改第二个模型时执行一些其他操作。我可以用ModelTwo上的post_save信号来做到这一点。但是，当我将模型从自己的编辑页面（即不在ModelOne的内联中）保存下来时，只会调用post_save信号。

有没有办法附加poststave信号在ModelTwo的内联格式？

...作为一种解决方法，我向ModelTwo添加了一些自定义验证，无论内联是否被调用，都被调用），调用我想要的方法然而，由此设置引起的问题是，如果正在创建一个ModelOne的新实例，并且同时创建了ModelTwo的实例，则无法访问关联两个表的新实例的主键（外键）（因为它还没有保存）。而且主键是我需要的东西。

我还尝试直接向ModelOne添加一个post_save信号（以便我可以获得新的实例的PK），但是似乎post_save信号没有通过ModelTwo的数据（为什么还要呢？）

那么这个解决方案是什么？内联模型是否发射信号？在存储新实例之前有没有办法访问新实例的PK？

解决方案

模型是模型。模型在管理界面中作为内联使用的事实不会以任何方式从其中消失。除非您重写其功能，否则所有型号均会发出后保存信号。

以下是保存任何模型时会发生的情况。

So I have two models (Tables) related by a ForeignKey. In the admin, the edit page displays the first model (let's say ModelOne) along with the related instances of the second model, ModelTwo (TabularInline).

What I want is perform some additional actions when the second model is being changed. I can do this with a post_save signal on ModelTwo. However, the post_save signal is only called when I save the model from within its own edit page (ie. not within ModelOne's inlines).

Is there a way to attach a post_save signal on ModelTwo's inline form?

...As a workaround I added some custom validation to ModelTwo, which is being called regardless if it's inline or not), to call the method I want. However, the problem that arises from this setting is that if am creating a new instance of ModelOne and also create instances of ModelTwo at the same time I cannot access the primary key (foreign key) of the new instance that relates the two tables (since it has not been saved yet). And the primary key is something I need.

I also tried adding a post_save signal to ModelOne directly (so that I can get the new instance's PK) but it seems that the post_save signal does not pass ModelTwo's data (and why should it, anyway?)

So what's the solution to this? Do inline models emit signals? Is there a way to access the PK of the new instance before saving it?

解决方案

Models are Models. The fact that a Model is used in the admin interface as inline doesn't take away from it in any way. All models emit a post save signal unless you override its functionality.

Here is what happens when you save any model.

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