小编sni*_*tko的帖子

当我在掌握时,我只需要输入'git push'来将提交推送到远程仓库.我希望在我在另一个分支上时可以这样做,而不指定远程名称和分支名称.像那样:

现在: git push origin experimental:origin/experimental

需要: git push

我在命名空间中有一堆控制器Foo.我想before_filter 'require_user'对所有这些应用,但不应用于不属于Foo命名空间的其他控制器.

除了在每个控制器中显式调用before_filter方法之外,还有什么办法可以实现这个目的吗？

每当我定义这样的私有方法时：

class ParentClass {

  sayHi() { _initiateGreeting(); }
  _initiateGreeting() { print("I'm a parent class"); }

}

不可能在子类中重新定义它：

class ChildClass extends ParentClass {
  _initiateGreeting() { print("I'm a child class"); } // redefining the method
}

现在，如果我创建了一个 aChildClass和 callsayHi()方法的实例，那么ParentClass实际调用的是 a 中的私有方法：

var child = new ChildClass();
child.sayHi(); // outputs "I'm a parent class"

但是，如果_initiateGreeting()在任何地方都公开（即剥离了_），则child.sayHi()在输出中调用results I'm a child class。

为什么？如何重新定义私有方法以便在子类中调用它？

据我所知，目前 Dart 没有明确的方法从内存中删除对象，并且不再在任何地方引用的对象会自动删除。

但我一直在进行一些基准测试。这是代码：

import 'dart:html';
import 'dart:async';

var components = [];
var times_to_run = 10;

class MockComponent {

  Element element = new Element.html('<table></table>');

  remove() {
    element.remove();
    element = null;
  }

}

createAndRemoveComponents(t) {

  var n = 50000; // number of objects to create and delete in this run

  print("***Run #${times_to_run}");
  print("creating $n objects...");
  for(var i=0; i < n; i++) {
    components.add(new MockComponent());
  }
  print("...done");


  print("removing $n objects...");
  while(components.length > 0) {
    components.removeAt(0).remove();
  }
  print("...done");

  times_to_run -= 1;

  if(times_to_run <= …

有人可以拆解它并向我解释它是如何工作的吗？这是受保护的电子邮件链接.

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</script>

我正在使用Paperclip,这是我在模型中删除附件的内容:

  def before_save
    self.avatar = nil if @delete_avatar == 1.to_s 
  end

除非@delete_avatar在用户实际上传图像时设置了标志(因此模型同时接收params[:user][:avatar]和params[:user][:delete_avatar].),否则工作正常.这会导致以下错误:

TypeError: can't convert nil into String
    from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:40:in `dirname'
    from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:40:in `flush_writes'
    from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:38:in `each'
    from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:38:in `flush_writes'
    from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/attachment.rb:144:in `save'
    from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/attachment.rb:162:in `destroy'
    from /Work/project/src/app/models/user.rb:72:in `before_save'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:347:in `send'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:347:in `callback'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:249:in `create_or_update'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2538:in `save_without_validation'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/validations.rb:1078:in `save_without_dirty'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/dirty.rb:79:in `save_without_transactions'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:229:in `send'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:229:in `with_transaction_returning_status'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `transaction'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:182:in `transaction'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:228:in `with_transaction_returning_status'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:196:in …

我需要在bash启动后立即运行命令,然后保持在会话中.我期待类似的东西可以工作bash && cd ~/Work,但是,显然,它会在初始会话中运行第二个命令,而不是我正在开始的那个.

我在新shell中发现了这个运行bash命令,并在此命令执行线程后保留在新shell中,但运行bash --rcfile对我不起作用,因为我仍然需要加载rcfile.

我希望能够使用Dart类构造函数执行此类操作:

class Model {

  // ... setting instance variables

  Model(Map fields) {
    fields.forEach((k,v) => this[k] = v);
  }

}

显然,这不起作用,因为this没有[]=方法.

有没有办法让它发挥作用,或者它根本不是做事的"飞镖方式"？如果不是,你能告诉我解决这个问题的正确方法吗？

如何检查对象的类是否包含mixin？例如:

class AClass extends Object with MyMixin {}
class BClass extends Object              {}

classIncludesMixin(new AClass(), 'MyMixin'); // => true
classIncludesMixin(new BClass(), 'MyMixin'); // => false

classIncludesMixin()为了让它起作用,这个方法应该是什么？

我的test_dir中有一堆文件，问题是它们必须单独运行，因为其中一个是测试只能在浏览器中运行的代码，另一个是测试只能在后端运行的代码.

现在，我知道有一个用于指定测试名称的-n参数pub run test，但是如何运行特定文件？从文档中看不是很清楚，我无法成功完成。