如您所见，此代码允许用户创建名为Images的模型。问题是，当我想要它们时，实际上没有创建图像。在我多次输入信息后，带有令人讨厌的大写字母（打印图像）的打印测试返回一个空列表。
也许与此问题有关，我根本无法在代码中的任何if / else循环中添加打印测试。它会返回缩进错误，即使我检查了四个空格的所有缩进。
我真的很困惑。我怀疑我误解了控制流程？
from django.shortcuts import render
from images_app.models import Image
def index(request):
images = Image.objects.all()
image_names = [a.name for a in images]
print images ### THIS RETURNS AN EMPTY LIST!!
if request.method == 'POST':
image_string = request.POST.get('get_image')
index = image_string.find('(')
# divide input into parent and child
if index == -1:
parent = image_string
child = None
else:
parent = image_string[0:index]
child = image_string[index+1:len(image_string)-1]
# print "Child is.. ", child.name ### THIS RETURNS AN INDENTATION ERROR
# create models based on input
if parent not in image_names and child not in image_names:
parent_model = Image(name=parent)
child_model = Image(name=child, parent=parent_model)
elif parent in image_names and child not in image_names:
parent_model = images.get(name=parent)
child_model = Image(name=child, parent=parent_model)
elif parent not in image_names and child in image_names:
child_model = images.get(name=child)
parent_model = Image(name=parent)
child_model.parent = parent_model
print "descendants are: ", parent_model.get_descendants()
else:
print "else"
return render(request, 'images_app/index.html', {'images':images})
def get_images(request):
term = request.GET.get('terms') #jquery-ui.autocomplete parameter
images = Image.objects.filter(name__istartswith=terms)
res = []
for i in images:
#make dict with the metadatas that jquery-ui.autocomple needs
dict = {'id':i.id, 'label':i.__unicode__(), 'value':i.__unicode__()}
res.append(dict)
return HttpResponse(simplejson.dumps(res))
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<title> images </title>
<script>
<script type="text/javascript">
$(function() {
$("#terms").autocomplete({
source: "{% url 'images_app:get_images' %}",
minLength: 1,
});
});
</script>
</head>
<nav>
<a href="/associate">associate</a>
</nav>
<body>
{% for images in images %}
{{ image.name }}
{% endfor %}
<section>
<h1>create an image</h1>
<form action="{% url 'images_app:index' %}" method="post">
{% csrf_token %}
<div class="ui-widget">
<label for="get_image">create image: </label>
<input id="get_image" name="get_image">
</div>
<div id="buttons">
<input type="submit" value="create" class="submit" name="create" />
</div>
</form>
</section>
</body>
答案 0 :(得分：4)
您永远不会保存任何图片。
执行Image(blah)只是实例化内存中的对象。您需要在实例上调用.save()，或者Image.objects.create(blah)同时实例化并保存。