在ForeignKey（非self.request.user）的CreateView中设置初始值 [英] set initial value in CreateView from ForeignKey (non-self.request.user)

问题描述

我正在尝试在基于类的视图CreateView中访问ForeignKey。我想要能够从ForeignKeys动态设置CBV的初始值，并且还可以从ForeignKeys动态设置模板链接。

这两个问题（1.初始值，2。模板链接）可能会以类似的方法解决，或者可能通过不同的方法来解决...我还在学习。也许第一个问题可以在 views.py 中解决，第二个问题可以通过 ingredients_form.html ？

我已经看到有关SO设置初始值的问题（ self.request.user ），但不是仅仅是 models.py 中的普通外键。

我正在经历 django-by-errors ，并尝试添加额外的功能来扩展我的django知识。 p>

我的问题专门针对 views.py：IngredientAddView（CreateView），
ingredients_form.html ，并在 urls.py:'recipe-detail'& '成分添加'。

当我查看'recipe-detail' / code>，我可以点击链接到'ingredients-add'。我想要成分添加来知道哪个食谱点击了它，并且可以将此食谱设置为初始值（我尝试在 views.py：IngredientAddView:get_initials（self）不起作用），还可以链接回此配方（我尝试在 ingredients_form.html：{％

感谢任何帮助。

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食谱（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 __ lf）：
 return self.title 
 
 def get_absolute_url（self）：
 return reverse（'recipe-detail'，kwargs = {'slug'：self.slug}） 
 
 class成分（models.Model）：
食谱= models.ForeignKey（食谱）
 food = models.ForeignKey（食物）
 
 def __str__ （自）：
返回'％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 = Ing 
 
＃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 '食谱'）
} 
  

urls.py

  from .views import FoodListView，FoodDetailView，FoodCreateView，RecipeListView，RecipeDetailView，RecipeCreateView，RecipeUpdateView，IngredientAddView 
 
 urlpatterns = pattern（''，
 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  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 /create/$',FoodCreateView.as_view(),name='food-create'），
）
  

recipe_detail.html

  {％extendsbase_food.html％} 
 
 {％block title％} {{recipe}} {％endblock％} 
 
 {％block content％} 
< h1> {{recipe}} < / H1> 
< p> {{recipe.id}}< / p> 
< p> {{recipe.title}}< / p> 
 
< br> 
< h2>说明< / h2> 
< p> {{recipe.description | default：'No description'}}< / p> 
 
< h2>成分< / h2> 
< ul> 
 {％for recipesingredient_set.all％} 
< li> {{ingredients}}< / li> 
 {％endfor％} 
< / ul> 
< p>< a href ={％url'ingredients-add'recipe.slug％}>添加成分< / a>< / p> 
< p>< a href ={％url'recipe-edit'recipe.slug％}>编辑配方< / a>< / p> 
< p>< a href ={％url'recipe-list'％}>返回配方列表< / a>< / p> 
 {％endblock％} 
  

ingredients_form.html

  {％extendsbase_food.html％} 
 
 {％block title％}添加成分{％ endblock％} 
 
 {％block content％} 
< h1>添加成分< / h1> 
< form method =POST> {％csrf_token％} 
 {{form}} 
< button type =submitclass =btn btn-primary>保存和LT; /按钮> 
< / form> 
 
 {％comment％}< p>< a href ={％url'recipe-detail'recipe.slug％}>返回到详细信息< / a>< / p> ; {％endcomment％} 
< p>< a href ={％url'recipe-list'％}>返回配方列表< / a>< / p> 
 {％endblock％} 
  

解决方案

要实例化你的食谱：

  class IngredientAddView（CreateView）：
 model = Ingredient 
 
 def get_initial（self）：
 recipe = get_object_or_404（Recipe，slug = self.kwargs.get（'slug'））
 return {
'recipe'：recipe，
} 
  

I am attempting to access ForeignKeys in Class Based Views CreateView. I would like to be able to dynamically set initial values in CBV from ForeignKeys and also dynamically set template links from ForeignKeys.

These two questions (1. initial values, 2. template links) may be solved in similar methods, or perhaps by different methods... I'm still learning. Perhaps the first question can be solved within views.py and the second question can be solved with template syntax in ingredient_form.html?

I've seen questions on SO setting initial values from users (self.request.user), but not from just a normal foreign key in models.py.

I'm going through django-by-errors, and attempting to add extra features to expand my django knowledge.

My question specifically centers on views.py:IngredientAddView(CreateView), on ingredient_form.html, and on urls.py:'recipe-detail' & 'ingredient-add'.

When I view a 'recipe-detail', I can click a link to 'ingredient-add'. I would like 'ingredient-add' to "know" which recipe clicked to it, and be able to set this recipe as the initial value (my attempt within views.py:IngredientAddView:get_initials(self) does not work), and also be able to link back to this recipe (my attempt within ingredient_form.html:{% comment %} does not work).

Would appreciate any assistance.

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 %}

解决方案

You need to instantiate your recipe:

class IngredientAddView(CreateView):
    model=Ingredient

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

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