Question

我试图在基于类的视图CreateView中访问ForeignKeys。我希望能够从ForeignKeys动态设置CBV中的初始值，并动态设置来自ForeignKeys的模板链接。

这两个问题（1.初始值，2。模板链接）可以用类似的方法解决，也可以用不同的方法解决......我还在学习。也许第一个问题可以在views.py内解决，第二个问题可以通过ingredient_form.html中的模板语法解决吗？

我看到有关SO设置用户初始值（self.request.user）的问题，但不是models.py中的普通外键。

我正在浏览django-by-errors，并试图添加额外的功能来扩展我的django知识。

我的问题特别集中在views.py:IngredientAddView(CreateView)上 ingredient_form.html和urls.py:'recipe-detail'＆amp; 'ingredient-add”。

当我查看'recipe-detail'时，我可以点击指向'ingredient-add'的链接。我希望'ingredient-add'“知道”哪个食谱点击它，并且能够将此食谱设置为初始值（我在views.py:IngredientAddView:get_initials(self)内的尝试不起作用），并且还能够链接回来这个食谱（我在ingredient_form.html:{% comment %}内的尝试不起作用。）

非常感谢任何协助。

models.py

class Food(models.Model):
    name=models.CharField(max_length=20,unique=True)

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('food-detail',kwargs={'pk':self.pk})

class Recipe(models.Model):
    title=models.CharField(max_length=80,unique=True)
    slug=models.SlugField(max_length=80,unique=True)
    description=models.TextField(blank=True)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('recipe-detail',kwargs={'slug':self.slug})

class Ingredient(models.Model):
    recipe=models.ForeignKey(Recipe)
    food=models.ForeignKey(Food)

    def __str__(self):
        return '%s (%s)' % (self.food, self.recipe)

views.py

class FoodListView(ListView):
    model=Food

class FoodDetailView(DetailView):
    model=Food

class FoodCreateView(CreateView):
    model=Food

class RecipeListView(ListView):
    model=Recipe

class RecipeDetailView(DetailView):
    model=Recipe

class RecipeCreateView(CreateView):
    model=Recipe

class RecipeUpdateView(UpdateView):
    model=Recipe

class IngredientAddView(CreateView):
    model=Ingredient

#    def get_context_data(self,**kwargs):
#        context=super(IngredientAddView,self).get_context_data(**kwargs)
#        context['foreign']=self.request.session.get('slug')

    def get_initials(self):
        return {
            'recipe':self.request.session.get('recipe')
        }

urls.py

from .views import FoodListView, FoodDetailView, FoodCreateView, RecipeListView, RecipeDetailView, RecipeCreateView, RecipeUpdateView, IngredientAddView

urlpatterns=patterns('',
                     url(r'^$',RecipeListView.as_view(),name='recipe-list'),
                     url(r'^(?P<slug>[-\w]+)$',RecipeDetailView.as_view(),name='recipe-detail'),
                     url(r'^(?P<slug>[-\w]+)/edit$',RecipeUpdateView.as_view(),name='recipe-edit'),
                     url(r'^(?P<slug>[-\w]+)/add_ingredient/$',IngredientAddView.as_view(),name='ingredient-add'),
                     url(r'^new/$',RecipeCreateView.as_view(),name='recipe-create'),
                     url(r'^food/$',FoodListView.as_view(),name='food-list'),
                     url(r'^food/(?P<pk>[\d]+)$',FoodDetailView.as_view(),name='food-detail'),
                     url(r'^food/create/$',FoodCreateView.as_view(),name='food-create'),
                 )

recipe_detail.html

{% extends "base_food.html" %}

{% block title %}{{ recipe }} {% endblock %}

{% block content %}
  <h1>{{ recipe }}</h1>
  <p>{{ recipe.id }}</p>
  <p>{{ recipe.title }}</p>

  <br>
    <h2>Description</h2>
  <p>{{ recipe.description|default:'No description' }}</p>

  <h2>Ingredients</h2>
  <ul>
    {% for ingredient in recipe.ingredient_set.all %}
      <li>{{ ingredient }}</li>
  {% endfor %}
  </ul>
  <p><a href="{% url 'ingredient-add' recipe.slug %}">Add ingredient</a></p>
  <p><a href="{% url 'recipe-edit' recipe.slug %}">Edit recipe</a></p>
  <p><a href="{% url 'recipe-list' %}">Back to recipe list</a></p>
{% endblock %}

ingredient_form.html

{% extends "base_food.html" %}

{% block title %}Add Ingredient{% endblock %}

{% block content %}
  <h1>Add Ingredient</h1>
  <form method="POST">{% csrf_token %}
    {{ form }}
    <button type="submit" class="btn btn-primary">Save</button>
  </form>

{%comment%}  <p><a href="{% url 'recipe-detail' recipe.slug %}">Back to detail</a></p> {%endcomment%}
  <p><a href="{% url 'recipe-list' %}">Back to recipe list</a></p>
{% endblock %}

Answer 1

您需要实例化您的食谱：

class IngredientAddView(CreateView):
    model=Ingredient

    def get_initial(self):
        recipe = get_object_or_404(Recipe, slug=self.kwargs.get('slug'))
        return {
            'recipe':recipe,
        }

在ForeignKey中设置CreateView的初始值（非self.request.user）

1 个答案: