Django:仅更新 UpdateView 中已更改的字段 [英] Django: Only update fields that have been changed in UpdateView

问题描述

我正在使用 UpdateView 来更新一系列字段.但是，我只希望将已修改的字段保存到数据库中.如果在更新过程中未为字段提供值，我希望使用先前的值作为默认值.如果为字段提供了新值，则只应更新该字段.我该如何完成这项工作?

#views.py类帐户更新(更新视图):"""更新帐户；未更改的字段将不会更新."""context_object_name = '帐户'form_class = UpdateForm模板名称 = '账户/update_account.html'success_url = '/accounts/home'def get_object(self, queryset=None):返回 self.request.userdef form_valid(self, form):清洁 = form.cleaned_data#encrypt 普通密码form.instance.password = hash_password(clean['password'])上下文 = {}self.object = context.update(clean, force_update=False)return super(AccountUpdate, self).form_valid(form)#模板{% 扩展 'base.html' %}<title>{% 区块标题 %}更新账户{% endblock %}{% 块内容 %}{{ account.non_field_errors }}<div class="errors" style="list-style-type: none;">{% if account.first_name.errors %}{{ account.first_name.errors }}{% endif %}{% if account.last_name.errors %}{{ account.last_name.errors }}{% endif %}{% if account.email.errors %}{{ account.email.errors }}{% endif %}{% if account.password.errors %}{{ account.password.errors }}{% endif %}{% if account.username.errors %}{{ account.username.errors }}{% endif %}

<form action="" name="edit" method="post">{% csrf_token %}<ul><li>全名</li><li>{{ form.first_name }}{{ form.last_name }}<li>电子邮件</li>

{{ form.email }}

<li>密码</li><li>{{ form.password }}</li><li>用户名</li><li>{{ form.username }}</li><ul><li><input type="submit" value="update account"></li></表单><ul><li class="nav"><a href="/accounts/">取消更改</a></li>{% 结束块 %}

所有字段也在models.py 中声明为必需.目前，表单仅在我为每个字段提供值时才有效.

解决方案

我在更新过程中使用自定义哈希来加密密码.当我访问编辑页面并点击更新按钮时，当前加密形式的旧密码会被重新加密，从而丢失旧密码

我会通过不在表单中包含 password 本身来处理这个问题.相反，我会添加一个新字段(类似于 new_password)以允许输入新密码.然后，在您的 is_valid 方法中，将密码设置为该字段的散列值(如果有内容).

您还应该使用敏感值过滤工具防止用户密码出现在电子邮件错误报告中.

class UpdateForm(forms.ModelForm):元类:模型 = 用户字段 = ('first_name', 'last_name', 'email', 'username')new_password = forms.CharField(required=False, widget=forms.widgets.PasswordInput)

然后在您看来:

@sensitive_variables('new_password')@sensitive_post_parameters('new_password')def form_valid(self, form):清洁 = form.cleaned_datanew_password = clean.get('new_password')如果新密码:#encrypt 普通密码form.instance.password = hash_password(new_password)return super(AccountUpdate, self).form_valid(form)

I'm using an UpdateView to update a series of fields. However, I only want fields that have been modified to be saved to the database. If a value was not provided for a field during update process, I want the previous value to be used as the default. If a new value was provided for a field then only that field should be updated. How do I go about accomplishing this?

#views.py
class AccountUpdate(UpdateView):
""" Updates an account; unchanged fields will not be updated."""
context_object_name = 'account'
form_class = UpdateForm
template_name = 'accounts/update_account.html'
success_url = '/accounts/home'

def get_object(self, queryset=None):
    return self.request.user

def form_valid(self, form):
    clean = form.cleaned_data
    #encrypt plain password
    form.instance.password = hash_password(clean['password'])
    context = {}
    self.object = context.update(clean, force_update=False)
    return super(AccountUpdate, self).form_valid(form)

#templates
{% extends 'base.html' %}
<title>{% block title %}Update Account{% endblock %}</title>
{% block content %}
{{ account.non_field_errors }}
<div class="errors" style="list-style-type: none;">
    {% if account.first_name.errors %}{{ account.first_name.errors }}{% endif %}
    {% if account.last_name.errors %}{{ account.last_name.errors }}{% endif %}
    {% if account.email.errors %}{{ account.email.errors }}{% endif %}
    {% if account.password.errors %}{{ account.password.errors }}{% endif %}
    {% if account.username.errors %}{{ account.username.errors }}{% endif %}
</div>
<form action="" name="edit" method="post">
    {% csrf_token %}
    <ul>
        <li>Fullname</li>
       <li> {{ form.first_name }}{{ form.last_name }}</li>
        <li>Email</li>
        <li>{{ form.email }}</li>
        <li>Password</li>
        <li>{{ form.password }}</li>
        <li>Username</li>
        <li>{{ form.username }}</li>
    </ul>
    <ul>
        <li><input type="submit" value="update account"></li>
    </ul>
</form>
<ul>
    <li class="nav"><a href="/accounts/">cancel changes</a></li>
</ul>
{% endblock %}

All the fields are also declared as required in models.py. Currently the form only works if i provide a value for each field.

解决方案

i'm using a custom hash during update process to encrypt passwords. When i visit the edit page and hit update button, the old password in its current encrypted form gets re-encrypted hence losing the old password

I would handle that by not including password itself in the form. Instead, I would add a new field (something like new_password) to allow entering a new password. Then, in your is_valid method, set the password to the hashed value of that field if there's content.

You should also use the sensitive value filtering tools to prevent user passwords from showing up in emailed error reports.

class UpdateForm(forms.ModelForm):
    class Meta:
        model = user
        fields = ('first_name', 'last_name', 'email', 'username')
    new_password = forms.CharField(required=False, widget=forms.widgets.PasswordInput)

And then in your view:

@sensitive_variables('new_password')
@sensitive_post_parameters('new_password')
def form_valid(self, form):
    clean = form.cleaned_data
    new_password = clean.get('new_password')
    if new_password:
        #encrypt plain password
        form.instance.password = hash_password(new_password)
    return super(AccountUpdate, self).form_valid(form)

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