在Django模板中显示查询集对象
[英]Display query set object in django template
问题描述
I have a model Post that I'm trying to display all the posts onto a template. 
我有一个模型Post ，我试图将所有帖子显示到模板上。 I'm including the post.html onto the home.html.... I found a similar problem to my question but the objects still are not getting displayed link 我将post.html包含到home.html中。...我发现了与我的问题类似的问题，但对象仍未得到显示链接
I firt tried the to use python manage.py shell to create an object. 我尝试使用python manage.py shell创建对象。 So first I did this. 所以首先我做到了。 Post.objects.all() <QuerySet [<Post: test>, <Post: admin>]>
then I tried to create a new posts. 然后我尝试创建一个新帖子。 Post.objects.create(user="test", content="New comment") but got this error: ValueError: Cannot assign "'test'": "Post.user" must be a "User" instance. Post.objects.create(user="test", content="New comment")但收到此错误： ValueError: Cannot assign "'test'": "Post.user" must be a "User" instance.
Tried to troubleshoot and couldn't resolve it. 试图进行故障排除，但无法解决。 So I just decided to write the code in the posts/views.py and it didn't work as well. 因此，我决定将代码编写在posts / views.py中，但效果也不佳。 I figure this is the root of my problem why the objects aren't showing up in the templates. 我认为这是问题的根源，为什么这些对象没有显示在模板中。
This is my posts/posts.views 这是我的posts / posts.views
def posts_list(request):
# if request.user.is_authenticated():
queryset = Post.objects.all()
context = {
"object_list": queryset,
"user": "username"
}
return render(request, "posts.html", context)
This is my templates/post.html 这是我的模板/ post.html
<!DOCTYPE html>
<html lang="en">
<body>
<h1>What's on your mind, {{ user }}</h1>
{ % for obj in object_list %}
{{obj.user}}<br/>
{{obj.content}}<br/>
{{obj.timestamp}}<br/>
{% endfor %}
</body>
</html>
3 个解决方案
解决方案1
0 2019-02-17 17:50:13
Normally in request, django automatically add requested user. 通常，在请求中， django自动添加请求的用户。 If that user has related permission to add new Post then following code should work 如果该用户具有添加新帖子的相关权限，则以下代码应能正常工作
Post.objects.create(user=request.user, content="New comment")
解决方案2
0 已采纳 2019-02-17 17:57:08
You have asked two questions here. 您在这里问了两个问题。 I'll answer both of them below: 我将在下面回答两个问题：
Displaying your posts 显示你的帖子
First, you need to make sure that you are passing a user object to your template. 首先，您需要确保将用户对象传递给模板。 Assuming that user info is stored in request.user, you can do so as follows: 假设用户信息存储在request.user中，则可以执行以下操作：
views.py: views.py：
def posts_list(request):
if request.user.is_authenticated:
user = request.user
queryset = Post.objects.all()
context = {
"object_list": queryset,
"user": user
}
return render(request, "home.html", context)
home.html: home.html的：
<html>
<h1>Homepage</h1>
{% if user.is_authenticated %}
<h1>What's on your mind, {{ user }}</h1>
{ % for obj in object_list %}
{{obj.user}}<br/>
{{obj.content}}<br/>
{{obj.timestamp}}<br/>
{% endfor %}
<a href="{% url 'logout' %}">Logout</a>
{% endif %}
</html>
Adding a post for a user 为用户添加帖子
You need to get a user object to pass to your creation method, rather than using the string "test". 您需要获取一个用户对象以传递给您的创建方法，而不是使用字符串“ test”。 The reason your attempt is failing is because you are passing the function a string ("test") where it is expecting a user object. 尝试失败的原因是因为您正在向函数传递期望用户对象的字符串（“ test”）。
This line gets a user (arbitrarily grabs the first one in your list): 该行吸引用户（任意获取列表中的第一个用户）：
u = User.objects.all()[0]
This line imports the datetime module, which you'll need to generate date and datetime objects for your create method: 此行导入datetime模块，您需要使用该模块为create方法生成date和datetime对象：
import datetime
And this line creates a post for that user: 此行为该用户创建了一个帖子：
Post.objects.create(user=u, content="New comment", publish=datetime.date.today(), updated=datetime.datetime.now(), timestamp=datetime.datetime.now())
解决方案3
0 2019-02-17 19:03:21
When you are creating a foreign key, you are referring a model. 在创建外键时，是在引用模型。 suppose there are two models A and B. B has following fields - x, y, z. 假设有两个模型A和B。B具有以下字段-x，y，z。 Now, x field is a foreign key, which is referring model A. 现在，x字段是一个外键，它引用模型A。
Now whenever you want to create an object of B, then the value of x field should be an object of A. Little bit like this - 现在，无论何时要创建B的对象，x字段的值都应该是A的对象。
post1 = Post(user = an object of User Model, content = "your value") post1 =发布（用户=用户模型的对象，内容=“您的值”）
so create an object of User first. 因此，首先创建一个User对象。 Then write it there. 然后在那写。 otherwise it will give error. 否则会报错。
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