如何从Django中的链接设置预定义的表单值？ [英] How to set a predefined form value from a link in Django?

问题描述

我的项目排列如下：

1. page
   has many: categories

2. category
   belongs to: page
   has many: items

3. item
   belongs to: category

当我输入我想修改的页面（添加新类别或这些类别的新项目），到目前为止，我只能得到一个点，我可以通过一个主链接添加一个新的类别或一个项目，让我到一个表格，我必须选择该项目必须属于哪个类别。我想做的是在类别标题旁边添加一个链接添加新项目，当我点击它时，项目表单默认设置为该类别。我怎样才能做到这一点？我现在的形式看起来很原始，如下所示：

when I enter a page I'd like to modify (add new categories or new items to those categories), so far I've only gotten to the point where I can add a new category or an item through a main link that gets me to a form where I have to chose which category the item must belong to. What I'd like to do is have a link "Add new item" next to categories title and when I click on it, the item form sets to that category by default. How can I do that? My current form looks very primitive, like so:

{% extends "base.html" %}
{% block content %}

{% if page.id %}
<h1>Edit Category</h1>
{% else %}
<h1>Add Category</h1>
{% endif %}

<form action="{{ action }}" method="POST">
    {% csrf_token %}
    <ul>
        {{ form.as_ul }}
    </ul>
    <input type="submit" id="save_page" value="Save" class="success button" /> <a href="javascript:window.history.back();">Cancel</a>
</form>

{% endblock %}

推荐答案

p>所以，这样做的方法是将其从表单中完全排除，并将其设置在保存视图中。

So, the way to do this is to exclude it from the form completely and set it in the view on save.

class ItemForm(forms.ModelForm):
    class Meta:
        model = Item
        exclude = ('category',)

和视图：

def create_item(request, category_id):
    if request.method == 'POST':
        form = ItemForm(request.POST)
        if form.is_valid():
            item = form.save(commit=False)
            item.category_id = category_id
            item.save()
            return redirect(...)
    ...etc...

通过网址提供：

url(r'^create_item/(?P<category_id>\d+)/$, 'create_item', name='create_item'),

你可以在哪里重新链接到您的类别列表：

and which you can therefore link to from your categories list:

{% for category in categories %}
    <li>{{ category.name }} - <a href="{% url 'create_item' category.id }">Create item</a></li>
{% endfor %}

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