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[英]Calling properties using "Self" keyword and One-To-Many Relationships in Django
[英]How to access properties of one-to-Many relationships in Django templates?
我是 Python 和 Django 的新手。我正在構建一個個人日記,其中包含非常簡單的屬性,例如月份和條目。
class Month(models.Model):
id = models.AutoField(primary_key=True)
month_name = models.CharField(verbose_name="Month", max_length=20, unique=True)
year_number = models.IntegerField(verbose_name="Year")
featured_img = models.ImageField(verbose_name="Featured", upload_to='diary/featured_img', default=False)
class Meta:
verbose_name = "Month"
ordering = ['-year_number', 'month_name']
def __str__(self):
return '%s, %s' % (self.month_name, self.year_number)
class Entry(models.Model):
id = models.AutoField(primary_key=True)
title = models.CharField(max_length=200)
content = models.TextField()
month = models.ForeignKey('Month', on_delete=models.RESTRICT, null=True)
img = models.ImageField(verbose_name="Image", upload_to='diary/entry_img', default=False)
date_created = models.DateTimeField(verbose_name="Date", default=timezone.now)
def __str__(self):
return self.title
class Meta:
verbose_name_plural = "Entries"
ordering = ['-date_created']
我正在嘗試構建一個簡單的網頁,以列表形式顯示月份,當我單擊月份時,我會在詳細視圖中看到條目。 我完成了第一步,但我無法弄清楚如何在 Django 模板中訪問 Month 和 Entry model 之間的一對多關系。 我想要做的是顯示包含所有月份 model 對象的頁面,當用戶單擊特定月份時說“十二月”,Django 返回所有將月份 object 定義為十二月的條目。
這在我插入 TabularInLine 方法的管理站點中運行良好,我可以看到特定月份的所有條目,但我不知道如何在模板和視圖中執行此操作。
class EntryInLine(admin.TabularInline):
model = Entry
class MonthAdmin(admin.ModelAdmin):
inlines = [EntryInLine]
admin.site.register(Month, MonthAdmin)
class MonthListView(generic.ListView):
model = Month
context_object_name = 'month_list'
template_name = 'diary/month.html'
class MonthDetailView(generic.DetailView):
model = Entry
context_object_name = 'entries_list'
template_name = 'diary/entries.html'
def index(request):
month = Month.objects.all()
entry = Entry.objects.all()
context = {
'month': month,
'entry': entry,
}
return render(request, 'index.html', context=context)
urlpatterns = [
path('', views.index, name='index'),
path('month/', views.MonthListView.as_view(), name='month'),
path('month/<int:pk>', views.MonthDetailView.as_view(), name='entries'),
]
{% extends "base.html" %}
{% block title %}<title>Months</title>{% endblock %}
{% block content %}
<h1>Month</h1>
{% if month_list %}
<ul>
{% for month in month_list %}
<li>
<a href="month.get_absolute_url()">{{ month.month_name }}</a>
</li>
{% endfor %}
</ul>
{% else %}
<p>There are no months to display</p>
{% endif %}
{% endblock %}
{% extends "base.html" %}
{% block title %}<title>Entries</title>{% endblock %}
{% block content %}
{% if entries_list %}
{% for entry in entries_list %}
<h3>{{ entry.title }}</h3>
<p>{{ entry.date_created }}</p>
<p>{{ entry.content }}</p>
{% endfor %}
{% else %}
<p>There are no entries in this month.</p>
{% endif %}
{% endblock %}
我知道問題可能在於在 DetailView 和 url 映射中添加條目 model,但我無法在網上找到好的資源來解釋到底出了什么問題。
class MonthDetailView(generic.DetailView):
model = Entry
context_object_name = 'entries_list'
template_name = 'diary/entries.html'
def get_context_data(self, **kwargs):
pk = kwargs.get('pk') # this is the primary key from your URL
context = super(MonthDetailView, self).get_context_data(**kwargs)
context['entries_list'] = Entry.objects.filter(month=pk)
return context
我認為這可能會有所幫助。
我知道了! 在 MonthDetailView 中添加了一個 get_context_data function,現在可以使用了!
class MonthDetailView(generic.DetailView):
model = Entry
context_object_name = 'entries_list'
template_name = 'diary/entries.html'
def get_context_data(self, **kwargs):
context = super(MonthDetailView, self).get_context_data(**kwargs)
context['entries_list'] = Entry.objects.filter(month=self.kwargs['pk'])
return context
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