value,attrs=None,renderer=None):# 自定义渲染方式,支持自由格式输入# 可以使用HTML模板或其他方式来实现自定义渲染returnsuper().render(name,value,attrs,renderer)classMyModelForm(forms.ModelForm):my_foreign_key=forms.ForeignKey(widget=FreeInputWidget)classMeta:model=MyModel...
In regards to displaying a foreign key field in a form you can use theforms.ModelChoiceFieldand pass it a queryset. so, forms.py: classDocumentForm(forms.ModelForm):classMeta: model = Documentdef__init__(self, *args, **kwargs): user = kwargs.pop('user','')super(DocumentForm, sel...
(外键关联的那张表,,dept表的did必须设置为主键,person表的dept_id才可以设置为外键) alter table dept add primary key(did) # dept表的did必须得设为主键,才能为person表的dept_id设为外键 alter table person add constraint fk_did foreign key(dept_id) references dept(did); 1. 2. 一般外键是不可以...
ctime= models.DateTimeField(auto_now_add=True)#只有添加时才会更新时间uptime = models.DateTimeField(auto_now=True)#只要修改就会更新时间ip1= models.IPAddressField()#字符串类型,Django Admin以及ModelForm中提供验证 IPV4 机制ip2 = models.GenericIPAddressField()#字符串类型,Django Admin以及ModelForm中提供...
""" fk = _get_foreign_key(parent_model, model, fk_name=fk_name) # enforce a max_num=1 when the foreign key to the parent model is unique. if fk.unique: max_num = 1 kwargs = { 'form': form, 'formfield_callback': formfield_callback, 'formset': formset, 'extra': extra,...
from django import forms from django.contrib import admin from myapp.models import Person class PersonForm(forms.ModelForm): class Meta: model = Person exclude = ["name"] class PersonAdmin(admin.ModelAdmin): exclude = ["age"] form = PersonForm 在上面的例子中,“年龄” 字段将被排除,但 “...
Django是一个基于Python的开源Web应用框架,它提供了一套完整的工具和功能,用于快速开发高质量的Web应用程序。在Django中,foreign_key是一种关系字段,用于在模型之间建立关联关系。 在模板上访问通过foreign_key建立的关联数据时,可以通过以下步骤进行操作: 确保在模型中正确地定义了foreign_key字段。例如,如果一个...
Django的Form类:这个类集合了各种数据校验等功能。 9. 手动操作数据库时的常见报错 有时候,为了方便,直接对数据库中的数据做删除操作,这时候会报错: a foreign key constraint fails 这是因为多对多的数据表之间的关系。这时候要先删除中间表里的相关数据,再删父和子表的数据。
(max_length=255) def __str__(self): return self.username forms.py from .models import User from django.forms import ModelForm, TextInput, PasswordInput, EmailInput class UserForm(ModelForm): class Meta: model = User fields = ['username', 'password', 'firstName', 'lastName', 'email...
django.db.utils.IntegrityError: FOREIGN KEY constraint failed STATUS MODEL EDDIT Maybe problem is here. The problem is appeared after i added some code which you can see in comments. "This last error suggests that the Status with pk=1 already exists, but your previous error suggests the contr...