通过django admin添加动态字段

Question

我查看了堆栈，但找不到任何答案。 所以我有一个这样的模型：

class DynamicModel(models.Model):
    config = models.JSONField()

    def __str__(self):
        return self.config

我现在想要做的是将 json 字段键值对显示为独立字段，并且还能够以相同的方式编辑它们，就像它们每个都是不同的字段一样。这是我能想到的创造

dynamic fields

的最佳方式。所以如果我有一个像这样的 jsonfield:

{
    "age": 23, 
    "name": "John Doe",
    "gender": "Male"
}
I would have an `Age` field where I can edit the value or even remove the field alotgether. The changes would then reflect to the `JSONField`.

我的做法是这样的：

# forms.py
from django import forms
from .models import DynamicModel

class DynamicModelForm(forms.ModelForm):
    class Meta:
        model = DynamicModel
        fields = '__all__'

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Check if 'config' is in the fields
        if 'config' in self.fields:
            # Extract JSON data from the instance or initialize an empty dictionary
            json_data = self.instance.config if self.instance and 'config' in self.instance else {}

            # Loop through the JSON data and add individual fields
            for key, value in json_data.items():
                # Add a CharField for each key
                self.fields[key] = forms.CharField(initial=value, required=False)
                self.fields[key].label = key
                self.fields[key].widget.attrs.update({'style': 'display:block;'})

            # Remove the original JSON field
            self.fields.pop('config', None)

    def clean(self):
        cleaned_data = super().clean()
        json_data = cleaned_data.get('config', {})
        
        # Loop through the JSON data and add individual fields
        for key, value in json_data.items():
            cleaned_data[key] = value

        return cleaned_data

# admin.py
from django.contrib import admin
from .models import DynamicModel

class DynamicModelAdmin(admin.ModelAdmin):
    form = DynamicModelForm
    list_display = ['config']

admin.site.register(DynamicModel, DynamicModelAdmin)

但这似乎并不能解决问题。任何帮助表示赞赏。

Answer 1

一个想法可能是使用一个空的

ModelForm

，然后动态填充：

class DynamicModelForm(forms.ModelForm):
    class Meta:
        model = DynamicModel
        fields = []

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields.pop('config', None)
        json_data = self.instance.config or {}
        for key, value in json_data.items():
            # Add a CharField for each key
            self.fields[key] = forms.CharField(initial=value, required=False)
            self.fields[key].label = key
            self.fields[key].widget.attrs.update({'style': 'display:block;'})

    def save(self, *args, **kwargs):
        json_data = self.instance.config or {}
        cleaned_data = self.cleaned_data
        data = self.cleaned_data
        for key, value in json_data.items():
            config[key] = cleaned_data.get(key, value)
        self.instance.config = config
        return super().save(*args, **kwargs)

因此，我们添加了字段，或多或少就像您自己定义的那样。当我们想要保存项目时，我们将字段重新分组到字典中，并将其保存到实例中。