Python 从Django中的数据库中删除元素_Python_Django_Django 2.0

Python 从Django中的数据库中删除元素

python django

Python 从Django中的数据库中删除元素,python,django,django-2.0,Python,Django,Django 2.0,我正在尝试开发一个Django应用程序，能够对文件进行CRUD。目前，我已经开发了上传下载功能，但当我想删除项目时，事情变得非常困难 *Views.py* def list(request): # Handle file upload if request.method == 'POST': form = DocumentForm(request.POST, request.FILES) all_docs = Document.objects.all() repeate

我正在尝试开发一个Django应用程序，能够对文件进行CRUD。目前，我已经开发了上传下载功能，但当我想删除项目时，事情变得非常困难

*Views.py*

def list(request):
# Handle file upload
if request.method == 'POST':
    form = DocumentForm(request.POST, request.FILES)
    all_docs = Document.objects.all()
    repeated = False
    if form.is_valid():
        for doc in all_docs:
            if Document(docfile=request.FILES['docfile']).docfile == doc.docfile:
                repeated = True
        if not repeated:
            newdoc = Document(docfile=request.FILES['docfile'])
            newdoc.save()

            # Redirect to the document list after POST
            return HttpResponseRedirect(reverse('list'))
else:
    form = DocumentForm()  # A empty, unbound form

# Load documents for the list page
documents = Document.objects.all()

# Render list page with the documents and the form
return render(
    request,
    'list.html',
    {'documents': documents, 'form': form}
)

class DocumentForm(forms.Form):
docfile = forms.FileField(
    label='Select a file'
)

<body>
    <!-- List of uploaded documents -->
    {% if documents %}
        <ul>
            {% for document in documents %}
                <li><a href="{{ document.docfile.url }}">{{ document.docfile.name }}</a></li>
            {% endfor %}
        </ul>
    {% else %}
        <p>No documents.</p>
    {% endif %}

    <!-- Upload form. Note enctype attribute! -->
    <form action="{% url "list" %}" method="post" enctype="multipart/form-data">
        {% csrf_token %}
        <p>{{ form.non_field_errors }}</p>

        <p>{{ form.docfile.label_tag }} {{ form.docfile.help_text }}</p>

        <p>
            {{ form.docfile.errors }}
            {{ form.docfile }}
        </p>

        <p><input type="submit" value="Upload"/></p>
    </form>
</body>

def remove_document(request):

if request.method == 'POST':
    form = DocumentForm()
    # Dont know how to reference the item I want to delete
    document = request.POST.objects.get(docfile = ?????)

    db_documents = Document.objects.all()

    for db_doc in db_documents:
        if db_doc = document:
            document.delete()

return render(
        request,
        'list.html',
        {'documents': documents, 'form': form}
    )

*Forms.py*

def list(request):
# Handle file upload
if request.method == 'POST':
    form = DocumentForm(request.POST, request.FILES)
    all_docs = Document.objects.all()
    repeated = False
    if form.is_valid():
        for doc in all_docs:
            if Document(docfile=request.FILES['docfile']).docfile == doc.docfile:
                repeated = True
        if not repeated:
            newdoc = Document(docfile=request.FILES['docfile'])
            newdoc.save()

            # Redirect to the document list after POST
            return HttpResponseRedirect(reverse('list'))
else:
    form = DocumentForm()  # A empty, unbound form

# Load documents for the list page
documents = Document.objects.all()

# Render list page with the documents and the form
return render(
    request,
    'list.html',
    {'documents': documents, 'form': form}
)

class DocumentForm(forms.Form):
docfile = forms.FileField(
    label='Select a file'
)

<body>
    <!-- List of uploaded documents -->
    {% if documents %}
        <ul>
            {% for document in documents %}
                <li><a href="{{ document.docfile.url }}">{{ document.docfile.name }}</a></li>
            {% endfor %}
        </ul>
    {% else %}
        <p>No documents.</p>
    {% endif %}

    <!-- Upload form. Note enctype attribute! -->
    <form action="{% url "list" %}" method="post" enctype="multipart/form-data">
        {% csrf_token %}
        <p>{{ form.non_field_errors }}</p>

        <p>{{ form.docfile.label_tag }} {{ form.docfile.help_text }}</p>

        <p>
            {{ form.docfile.errors }}
            {{ form.docfile }}
        </p>

        <p><input type="submit" value="Upload"/></p>
    </form>
</body>

def remove_document(request):

if request.method == 'POST':
    form = DocumentForm()
    # Dont know how to reference the item I want to delete
    document = request.POST.objects.get(docfile = ?????)

    db_documents = Document.objects.all()

    for db_doc in db_documents:
        if db_doc = document:
            document.delete()

return render(
        request,
        'list.html',
        {'documents': documents, 'form': form}
    )

*List.html*

def list(request):
# Handle file upload
if request.method == 'POST':
    form = DocumentForm(request.POST, request.FILES)
    all_docs = Document.objects.all()
    repeated = False
    if form.is_valid():
        for doc in all_docs:
            if Document(docfile=request.FILES['docfile']).docfile == doc.docfile:
                repeated = True
        if not repeated:
            newdoc = Document(docfile=request.FILES['docfile'])
            newdoc.save()

            # Redirect to the document list after POST
            return HttpResponseRedirect(reverse('list'))
else:
    form = DocumentForm()  # A empty, unbound form

# Load documents for the list page
documents = Document.objects.all()

# Render list page with the documents and the form
return render(
    request,
    'list.html',
    {'documents': documents, 'form': form}
)

class DocumentForm(forms.Form):
docfile = forms.FileField(
    label='Select a file'
)

<body>
    <!-- List of uploaded documents -->
    {% if documents %}
        <ul>
            {% for document in documents %}
                <li><a href="{{ document.docfile.url }}">{{ document.docfile.name }}</a></li>
            {% endfor %}
        </ul>
    {% else %}
        <p>No documents.</p>
    {% endif %}

    <!-- Upload form. Note enctype attribute! -->
    <form action="{% url "list" %}" method="post" enctype="multipart/form-data">
        {% csrf_token %}
        <p>{{ form.non_field_errors }}</p>

        <p>{{ form.docfile.label_tag }} {{ form.docfile.help_text }}</p>

        <p>
            {{ form.docfile.errors }}
            {{ form.docfile }}
        </p>

        <p><input type="submit" value="Upload"/></p>
    </form>
</body>

def remove_document(request):

if request.method == 'POST':
    form = DocumentForm()
    # Dont know how to reference the item I want to delete
    document = request.POST.objects.get(docfile = ?????)

    db_documents = Document.objects.all()

    for db_doc in db_documents:
        if db_doc = document:
            document.delete()

return render(
        request,
        'list.html',
        {'documents': documents, 'form': form}
    )

我是Django的新手，它的架构模型对我来说太棘手了

谢谢

不幸的是，这对于一个正确的答案来说实在太宽泛了。您的更新代码非常混乱，这导致您在编写删除代码时误入歧途。作为提示，您不应该尝试使用这两种方法中的任何一种迭代所有文档；您应该通过

.objects.get（）

直接获取与接收到的ID相对应的实例，然后更新或删除它。我想我会用另一种方式，一种更“常见”的方式。谢谢你的回答！