Question

我正在创建一个搜索栏，该栏需要一个用户名并在数据库中找到该Player。我创建一个接受请求的PlayerStatsForm（），使用请求中的用户名在数据库中搜索玩家，然后返回该玩家的统计信息。我知道用户名通过html表单正确传递给了我的python代码，并且表单对PlayerStatsForm.is_valid（）传递了true，但是当我尝试调用playerstatsform.username时，它说未找到该属性。如果我添加model = Player并在PlayerStatsForm中将form.Form更改为ModelForm，它将尝试将没有用户名或ID的玩家插入数据库，并说user_id列不能为空

<tr><th><label for="id_username">Username:</label></th><td><input type="text" name="username" value="testuser" required id="id_username"></td></tr>
Internal Server Error: /elousers/elosearch/

这是来自终端的错误，是id = id_username而不是name = id_username的问题吗？

playerstatsform：


class PlayerStatsForm(forms.Form):
    username = forms.CharField()

    class Meta:
        fields = (
            'username',
        )

views.py：

def elosearch(request):
    if request.method == 'POST':
        print("Post was found")
        if 'get_player' in request.POST:
            playerstatsform = PlayerStatsForm(request.POST)
            print("post found")
            if playerstatsform.is_valid():
                player = Player.objects.get(name=playerstatsform.cleaned_data['username'])
                print("player found successfully")
                player_elo = player.elo
                player_name = player.name
                print(player_elo)
                context1 = {'playername': player_name, 'playerelo': player_elo}
                return render('elousers/elosearch.html', context1)
            else:
                invalid_player_entry = "Username not added. Please register below."
                context1 = {'invalid_player': invalid_player_entry}
                return render(request, 'elousers/elosearch.html', context1)
        elif 'addgame' in request.POST:
            gameform = GameForm(data=request.POST)
            if gameform.is_valid():
                gameform.save()
                game_success = "Game Successfully Added!"
                context2 = {'game_display': game_success}
                return render(request, 'elousers/elosearch.html', context2)
            else:
                game_invalid = "Invalid entry. Please try again."
                context2 = {'game_display': game_invalid}
                return render(request, 'elousers/elosearch.html', context2)
        else:
            return render(request, 'elousers/elosearch.html')
    elif request.method == 'GET':
        print("get was called")
        return render(request, 'elousers/elosearch.html')

期待数据库使用表单提供的用户名进行查询，但是我得到的“ PlayerStatsForm”对象没有属性“ username”

Answer 1

您可以从playerstatsform到.cleaned_data attribute [Django-doc]（是字典）中获取值。通过使用playerstatsform.username，您可以访问form字段，但是如果通过str传递该字段，则将呈现该字段的HTML表示形式。

def elosearch(request):
    if request.method == 'POST':
        print("Post was found")
        if 'get_player' in request.POST:
            playerstatsform = PlayerStatsForm(request.POST)
            if playerstatsform.is_valid():
                player = Player.objects.get(name=playerstatsform.cleaned_data['username'])
                player_elo = player.elo
                player_name = player.name
                context1 = {'playername': player_name, 'playerelo': player_elo}
                return render(request, 'elousers/elosearch.html', context1)

请注意，给定的Player可能没有name对象，或者，如果该字段不是unique=True，则多个Player可以拥有名称，因此您可能应该至少try-catch这些情况，并进行相应处理。

因此，您可能需要执行以下操作：

def elosearch(request):
    if request.method == 'POST':
        print("Post was found")
        if 'get_player' in request.POST:
            playerstatsform = PlayerStatsForm(request.POST)
            if playerstatsform.is_valid():
                try:
                    player = Player.objects.get(
                        name=playerstatsform.cleaned_data['username']
                    )
                except (Player.DoesNotExist, Player.MultipleObjectsReturned):
                    player = None
                    player_elo = None
                    player_name = None
                else:
                    player_elo = player.elo
                    player_name = player.name
                context1 = {'playername': player_name, 'playerelo': player_elo}
                return render(request, 'elousers/elosearch.html', context1)

'PlayerStatsForm'对象没有属性'username'

1 个答案: