Django(12) - 댓글 작성, 삭제

class Comment(models.Model):
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)
    # integer가 저장되지만 integerField를 안쓰는이유?
    # 참조 대상은(직접 참조) comment.article
    # 역참조는 article.comment_set 하려고
    # A라고 하는 모델에 B모델의 FK를 정의했을때 B모델은 A모델을 어떻게 쓸까? -> b.a_set
    article = models.ForeignKey(Article, on_delete=models.CASCADE)

from django.contrib import admin
from .models import Article, Comment

# Register your models here.
# https://docs.djangoproject.com/en/3.2/intro/tutorial07/
class ArticleAdmin(admin.ModelAdmin):
    list_display  = ('title', 'created_at', 'updated_at')
# Comment 추가
class CommentAdmin(admin.Model):
    list_display = ('content', 'created_at', 'article')

admin.site.register(Article, ArticleAdmin)
admin.site.register(Comment)

def detail(request, pk):
    # 특정 글을 가져온다.
    article = Article.objects.get(pk=pk)
    # template에 객체 전달
    context = {
        'article': article,
        'comment': article.comment_set.all(),
    }
    return render(request, 'articles/detail.html', context)

{% extends 'base.html' %}

{% block body %}
  <h1>{{ article.pk }}번 게시글</h1>
  <p>{{ article.created_at|date:"SHORT_DATETIME_FORMAT" }}
    |
    {{ article.updated_at|date:"y-m-d D" }}</p>
  <p>{{ article.content }}
  </p>
  {% if article.image %}
    <img src="{{ article.image.url }}" alt="{{ article.image }}" width="400" height="300">
  {% endif %}
  {% if article.image_thumbnail %}
    <img src="{{ article.image_thumbnail.url }}" alt="{{ article.image_thumbnail }}" width="400" height="300">

  {% endif %}
  <a href="{% url 'articles:update' article.pk %}">수정하기</a>
  <a href="{% url 'articles:delete' article.pk %}">삭제하기</a>
  # 댓글 출력
  <h4 class="my-3">댓글</h4>
  {% for comment in article.comment_set.all %}
    <p>{{ comment.content }}</p>
    <hr>
  {% endfor %}
{% endblock %}

from django import forms
from .models import Article, Comment

class ArticleForm(forms.ModelForm):

    class Meta:
        model = Article
        fields = ['title', 'content', 'image', 'image_thumbnail']
# commentForm 
class CommentForm(forms.ModelForm):
    class Meta:
        model = Comment
        fields = ['content']

def detail(request, pk):
    # 특정 글을 가져온다.
    article = Article.objects.get(pk=pk)
    comment_form = CommentForm()
    # template에 객체 전달
    context = {
        'article': article,
        'comments': article.comment_set.all(),
      	# comment_form 추가
        'comment_form': comment_form
    }
    return render(request, 'articles/detail.html', context)

from django.urls import path 
from . import views

app_name = 'articles'

urlpatterns = [
  path('', views.index, name='index'),
  path('create/', views.create, name='create'),
  path('<int:pk>/', views.detail, name='detail'),
  path('<int:pk>/update/', views.update, name='update'),
  path('<int:pk>/delete/', views.delete, name='delete'),
  # comment_create 생성
  path('<int:pk>/comments/', views.comment_create, name='comment_create'),
]

def comment_create(request, pk):
    article = Article.objects.get(pk=pk)
    comment_form = CommentForm(request.POST) # CommentForm의 인스턴스(모델폼)
    if comment_form.is_valid(): # comment_form : 어떤 클래스의 인스턴스
      	# 직접 DB에 save하지 않고 객체를 주면 
        # 내가 필요한 값을 직접 넣고 
        # save함
        comment = comment_form.save(commit=False) # comment : 어떤 클래스의 인스턴스
        comment.article = article # 모델폼의 save메서드는 리턴값이 그 모델의 인스턴스
        comment_form.save()
    return redirect('articles:detail', article.pk)

from django.urls import path 
from . import views

app_name = 'articles'

urlpatterns = [
  path('', views.index, name='index'),
  path('create/', views.create, name='create'),
  path('<int:pk>/', views.detail, name='detail'),
  path('<int:pk>/update/', views.update, name='update'),
  path('<int:pk>/delete/', views.delete, name='delete'),
  path('<int:pk>/comments/', views.comment_create, name='comment_create'),
  # 삭제 url 생성
  path('<int:article_pk>/comments/<int:comment_pk>/delete/', views.comment_delete, name='comment_delete'),
]

from .models import Article, Comment

def comment_delete(request, article_pk, comment_pk):
    comment = Comment.objects.get(pk=comment_pk)
    comment.delete()
    return redirect('articles:detail', article_pk)