如何避免在for-in循环中使用return语句？

问题描述

我下面的观点只是经历一个迭代周期，然后打破循环。我知道这可能是由于以下行中的return语句：return JsonResponse([post.serialize() for post in posts],safe=False)，但我如何避免这种情况？

我尝试将return语句更改为print语句，但是随后出现ValueError： The view network.views.followingPosts didn't return an HttpResponse object. It returned None instead.

就在except语句之前，我尝试在其中继续插入，但这没有效果。

我不太确定如何解决此问题。有什么想法吗？

def followingPosts(request,user_username):
    try:
        user_profile = get_object_or_404(User,username=user_username)
        following_users = user_profile.get_following()
        for person in following_users:
            posts = Post.objects.filter(creator=person)
    except Profile.DoesNotExist:
        return JsonResponse({"error": "No user found."},status=404)

    if request.method == "GET":
        return JsonResponse([post.serialize() for post in posts],safe=False)
    
    else:
        return JsonResponse({
            "error": "GET request required."
        },status=400)

解决方法

作为@quamrana，我认为该循环实施得很好，只是您仅存储上次循环运行的帖子。这是更正：

def followingPosts(request,user_username):
    try:
        user_profile = get_object_or_404(User,username=user_username)
        following_users = user_profile.get_following()
        posts = list()
        for person in following_users:
            posts += Post.objects.filter(creator=person)
    except Profile.DoesNotExist:
        return JsonResponse({"error": "No user found."},status=404)

    if request.method == "GET":
        return JsonResponse([post.serialize() for post in posts],safe=False)
    
    else:
        return JsonResponse({
            "error": "GET request required."
        },status=400)

此外，在尝试子句中保留一行也是一个好习惯。因此，

def followingPosts(request,username=user_username)
    except Profile.DoesNotExist:
        return JsonResponse({"error": "No user found."},status=404)

    if request.method == "GET":
        following_users = user_profile.get_following()
        posts = list()
        for person in following_users:
            posts += Post.objects.filter(creator=person)
        return JsonResponse([post.serialize() for post in posts],status=400)