Django只读字段只有在更改时，而不是创建时 [英] Django readonly field only on change, but not when creating

问题描述

我有一个团队 model whit 玩家 ManyToManyField，我想要添加 Player s创建时，新的团队，但创建后无法修改。

I have a Team model whit players ManyToManyField, and I want to be able to add Players to a new team when created, but not able to modify it after created.

如果我使 players field readonly like this：

If I make the players field readonly like this:

# admin.py
class TeamAdmin(admin.ModelAdmin)
    readonly_fields = ['players']

admin.site.register(Team, TeamAdmin)

我将无法将玩家添加到新的团队中。
如何使玩家字段创建后只读或类似的东西？

I will not be able to add players to a new Team. How can I make the players field "readonly after created" or something like that?

推荐答案

您需要覆盖 get_readonly_fields（） 您的管理员类的方法。

You need to override get_readonly_fields() method of your admin class.

# admin.py
class TeamAdmin(admin.ModelAdmin)
    ...

    def get_readonly_fields(self, request, obj=None):
        if obj: #This is the case when obj is already created i.e. it's an edit
            return ['players']
        else:
            return []

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