具有中间页面的Django管理员操作：未获取信息 [英] Django admin action with intermediate page: not getting info back

问题描述

我正在尝试创建一个管理员操作，以将自定义时间增量添加到某个日期。时间增量将从中间页面的输入中读取。确认之后，我会将那个增量应用于先前选择的每个实例。使用此代码（我对此问题进行了简化），我无法获得输入时间增量的值。我无法判断用户是否按下了应用按钮。

I'm trying to create an admin action that adds a custom time delta to some date. The time delta will be read from a input in the intermediate page. After confirming it, I will apply that delta to every instance selected previously. Using this code (I simplified for this question) I can't get the value of the entered time delta. I can't tell whether the user pressed the "Apply" button.

models.py

models.py

class Match(models.Model):
    date_of_match=models.DateTimeField()

admin.py

class MatchAdmin(admin.ModelAdmin):
    actions=('move_date',)
def move_date(self,request,queryset):
    if 'apply' in request.POST:
        #to do, add timedelta to date_of_match
        print("I'M IN!")
    return render(request.'admin/move_date.html',{'matches':queryset})
move_date.short_description="Move date"

move_date.html

move_date.html

{% extends "admin/base_site.html" %}
{% block content %}
<form action="" method="post">{% csrf_token %}
    <p>How much delta?<p>
    <input type="number" step="1" value="days"/>
    <input type="hidden" name="action" value="move_date" />
    <input type="submit" name="apply" value="Apply"/>
</form>
{% endblock %}

推荐答案

可能也是来帮助OP的时间很晚，但是当遇到相同的问题时，我遇到了这个问题，并且在其他地方看不到发生了什么。

Probably too late to help OP, but I came across this question when having the same issue and it was not immediately obvious looking elsewhere what was going on.

当 changelist_view 已处理（我们正在 POST 进入的视图），它出现在 request.POST 作为特定键： _selected_action 在 django.contrib.admin.helpers 中定义为 ACTION_CHECKBOX_NAME 。我使用了内置于admin中的delete动作作为参考，它在模板中以这种方式使用它：

When the changelist_view is processed (the view we are POSTing to) it looks in request.POST for a specific key: _selected_action which is defined in django.contrib.admin.helpers as ACTION_CHECKBOX_NAME. I used the delete action that is built into the admin for reference, and it uses it this way in the template:

{% for obj in queryset %}
  <input type="hidden" name="{{ action_checkbox_name }}" value="{{ obj.pk|unlocalize }}">
{% endfor %}

然后在您的上下文中，您只需要：

then in your context you just need to:

context = {
    'queryset': queryset,  # method param
    'action_checkbox_name': helpers.ACTION_CHECKBOX_NAME,
}

现在，当您 POST 您的表单，您可以在此处尝试检测/处理 POST 。 （您想从处理您的 POST 数据的块中返回 None ，以便视图知道返回到列表视图。）

Now your method gets called again when you POST your form, and you can detect/handle the POST as you're trying to do here. (You want to return None from the block that handles your POST data so the view knows to go back to the list view.)

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