Question

我试图在码头工人中创建一个容器;它通常工作得很好，但我突然遇到一个问题，我知道如何解决。

class MyModelAdmin(admin.ModelAdmin):
    list_display = ['name',
                    'foo',
                    'active',
                    'created',
                    'started',
                    'ended']

    list_editable = ['name',
                     'active',
                     'ended']

    def formfield_for_dbfield(self, db_field, *args, **kwargs):
        if db_field.name.lower() == 'foo':

            choices = sorted(some_dynamic_list)

            db_field.choices = choices

        return super().formfield_for_dbfield(db_field, *args, **kwargs)

    def get_changelist_form(self, request, *args, **kwargs):
        parent_form = super().get_changelist_form(request, *args, **kwargs)
        return self.get_childform(parent_form)

    def get_form(self, request, obj=None, *args, **kwargs):
        parent_form = super().get_form(request, obj, *args, **kwargs)
        return self.get_childform(parent_form, obj)

    def get_childform(self, parent_form, obj=None):
        class ChildForm(parent_form):

            def clean(self, *args, **kwargs):
                instance_dict = {}
                for instance in MyModel.objects.filter(active=True):
                    foo = instance.config_type.lower()
                    if foo in instance_dict:
                        instance_dict[foo].append(instance)
                    else:
                        instance_dict[foo] = [instance, ]
                if not obj:
                    for foo, instances in instance_dict.items():
                        for list_index, instance in enumerate(instances):
                            for other_instance in instances[list_index + 1:]:
                                if self.instances_conflict(instance, other_instance):
                                    raise forms.ValidationError("Instances of the same type must not overlap!")
                else:
                    for instance in instance_dict[obj.foo]:
                        if instance is not obj:
                            if self.instances_conflict(obj, instance):
                                raise forms.ValidationError("Instances of the same type must not overlap!")

                return super().clean(*args, **kwargs)

            def instances_conflict(self, instance_1, instance_2):
                if instance_1.ended is None and instance_2.started > instance_1.started:
                    return True

                if instance_2.ended is None and instance_1.started > instance_2.started:
                    return True

                if instance_1.started > instance_2.started and instance_1.started < instance_2.ended:
                    return True

                if instance_2.started > instance_1.started and instance_2.started < instance_1.ended:
                    return True

                return False
        return ChildForm

当它进入apt-get update时会抛出以下错误：

E：无法找到包apt-get
E：无法找到软件包安装

如果图像基于标准的ubuntu 14.04，这怎么可能？

Answer 1

您没有使用&&结束apt-get upgrade命令，因此它尝试在以下行安装“packages”。我喜欢将&&放在每行的开头，因为我更容易看到发生这种情况（并使复制/粘贴更容易）：

FROM ubuntu:14.04

RUN apt-get update \
 && apt-get upgrade -y \
 && apt-get install -y \
      openssh-server \
 && mkdir /var/run/sshd

RUN echo root:root | chpasswd
EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]

Answer 2

这很有效。

public static void main(String[] args) {
    JFrame fram = new JFrame();
    yesnoPanel question = new yesnoPanel("are you ok");
    JPanel q = question.getQuestion();
    JPanel a = question.getAnsw();
    JPanel all = new JPanel();
    all.add(q);
    all.add(a);
    yesnoPanel question2 = new yesnoPanel("sure ?");
    JPanel q2 = question2.getQuestion();
    q2.setSize(200,500);
    JPanel a2 = question2.getAnsw();
    JPanel all2 = new JPanel();
    all2.add(q2,BorderLayout.WEST);
    all2.add(a2);

    JScrollPane scroll = new JScrollPane();
    scroll.setPreferredSize(new Dimension(100,100));
    scroll.setViewportView(all);
    scroll.setVisible(true);
}

无法在docker容器中找到apt-get软件包

2 个答案: