管理后台中添加和修改页面的不同字段

Question

我有一个Django应用，在我的admin.py文件里有这样一个类：

class SoftwareVersionAdmin(ModelAdmin):
    fields = ("product", "version_number", "description",
      "media", "relative_url", "current_version")
    list_display = ["product", "version_number", "size",
      "current_version", "number_of_clients", "percent_of_clients"]
    list_display_links = ("version_number",)
    list_filter = ['product',]

我想在添加页面上显示这些字段，但在修改页面上显示不同的字段。我该怎么做呢？

Answer 1

我在使用上面的方法时，发现它在django 1.6.5中无法正常工作。所以我尝试创建表单，并根据对象是否存在来让get_form提供那些预定义的表单：

models.py:

from django.db import models

class Project(models.Model):
    name = models.CharField('Project Name', max_length=255)
    slug = models.SlugField('Project Slug', max_length=255, unique=True)

forms.py:

从django导入表单

从models导入Project

class ProjectAddForm(forms.ModelForm):

    test = forms.Field()

    class Meta:
        model = Project


class ProjectEditForm(forms.ModelForm):

    class Meta:
        model = Project
        fields = ("name", 'slug')

admin.py:

from django.contrib import admin
from models import Project
from forms import ProjectAddForm, ProjectEditForm


class ProjectAdmin(admin.ModelAdmin):

    def get_form(self, request, obj=None, **kwargs):
        # Proper kwargs are form, fields, exclude, formfield_callback
        if obj:
            self.form = ProjectEditForm
        else:
            self.form = ProjectAddForm
        return super(ProjectAdmin, self).get_form(request, obj, **kwargs)


admin.site.register(Project, ProjectAdmin)

现在我可以在表单的clean方法中拦截那个不持久的测试字段，并根据我的需要进行处理，只需在ProjectAddForm中重写clean方法即可：

def clean(self):
    cleaned_data = super(ProjectAddForm, self).clean()
    test = cleaned_data.get("test")
    # Do logic here
    #raise forms.ValidationError("Passwords don't match.")
    return cleaned_data

Answer 2

这是一个老问题，但我想补充一下，add_view 和 change_view 这两个方法可以进行修改来达到这个目的：

class SoftwareVersionAdmin(ModelAdmin):
     ...
     def add_view(self,request,extra_content=None):
         self.exclude = ('product','version_number',)
         return super(SoftwareVersionAdmin,self).add_view(request)

     def change_view(self,request,object_id,extra_content=None):
         self.exclude = ('product','description',)
         return super(SoftwareVersionAdmin,self).change_view(request,object_id)

Answer 3

首先，看看ModelAdmin类的get_form和get_formsets这两个方法的源代码，它们在django.contrib.admin.options.py这个文件里。你可以重写这两个方法，并使用kwargs来实现你想要的功能。例如：

class SoftwareVersionAdmin(ModelAdmin):
    def get_form(self, request, obj=None, **kwargs):
        # Proper kwargs are form, fields, exclude, formfield_callback
        if obj: # obj is not None, so this is a change page
            kwargs['exclude'] = ['foo', 'bar',]
        else: # obj is None, so this is an add page
            kwargs['fields'] = ['foo',]
        return super(SoftwareVersionAdmin, self).get_form(request, obj, **kwargs)