在 CreateView from ForeignKey (non-self.request.user) 中设置初始值

Question

我正在尝试访问基于类的视图CreateView中的外键。我希望能够从外键动态设置CBV中的初始值，并从外键动态设置模板链接。

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，第二个问题可以用ingredient_form.html中的模板语法解决？

我见过用户(self.request.user(关于SO设置初始值的问题，但不仅仅是来自models.py中的普通外键。

我正在逐个错误地经历django，并尝试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) ， ingredient_form.html，并在urls.py:'recipe-detail'和'ingredient-add'。

当我查看'recipe-detail'时，我可以单击指向'ingredient-add'的链接。我希望'ingredient-add'"知道"哪个食谱点击了它，并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(，并且还能够链接回此食谱(我在ingredient_form.html:{% comment %}内的尝试不起作用(。

将不胜感激任何帮助。

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,
        }