我收到了这条警告信息:
npm WARN安装无法安装可选依赖项:不支持
当我运行命令时:
$ npm i adaro --save
这个警告意味着什么？什么是可选的依赖？这是认真的吗？我该如何摆脱这种警告？
是否可以为npm我正在处理的不同项目安装多个版本,或者npm安装是否始终是全局的？(Windows 10)
还尝试使用https://github.com/marcelklehr/nodist安装不同的版本,但它似乎只影响节点版本,而不是npm版本.
或者npm版本真的重要吗？我是否可以使用最新的npm版本,即使项目说要求是某个npm版本？
我有一个控制器从中获取值$scope并将其发送到不同的状态:
controllers.controller('SearchController', ['$scope', '$state', '$stateParams',
function($scope, $state, $stateParams) {
$scope.search = function() {
$stateParams.query = $scope.keyword;
$state.go('search', $stateParams);
};
}]);
我不确定如何对这种搜索方法进行单元测试.我怎样才能验证是否已调用go方法或when($state.go('search', $stateParams)).then(called = true);使用Karma/AngularJS进行某种操作？
我正在尝试通过邻接列表构建图形,这意味着我需要所有节点的列表,并且在每个节点类中,我还需要一个数据结构来保存所有相邻节点.只是想知道最好的结构是什么(快速搜索目标节点类).数组是否有效？
&.Ruby 2.3 的安全操作符和try!ActiveSupport 的方法是否可以互换？如果不是,它们之间有什么区别？
使用聚合管道，我试图将嵌入式文档投影到根级别，而不必单独投影每个字段。
例如，我要name从此集合投影到根级别：
[
{
_id: "1",
name: {
firstName: "John",
lastname: "Peters"
}
},
{
_id: "2",
name: {
firstName: "Mary",
lastname: "Jones"
}
}
]
这是我在寻找的东西：
[
{
firstName: "John",
lastname: "Peters"
},
{
firstName: "Mary",
lastname: "Jones"
}
]
有没有一种方法可以不单独投影每个字段？我不想这样做：
db.collection.aggregate(
[
{
$project : {
"_id" : 0,
"firstName" : "$name.firstName",
"lastName" : "$name.lastName"
}
}
]
整个Mozilla开发者网站的大小是多少？api.jquery.com通过下载时大约是40MB wget.
当我更新记录时,它会删除现有字段并添加新字段.
这是更新前的记录:
{ "_id" : ObjectId("56a356863aa433ae37dc2cee"), "browser" : "Chrome", "version" : 47}
这是我执行的命令:
db.collection('profiles')
.update({
'_id' : obj("56a356863aa433ae37dc2cee") },
{"first_name" : first_name, "last_name" : last_name, "email" : email},
function (err, result) {
console.log(result);
});
这是我执行update命令后的记录:
{ "_id" : ObjectId("56a356c9a08487ed3719e40a"), "first_name" : "kaushik", "last_name" : "makwana", "email" : "kdmakwana" }
任何rails console在我的Rails应用程序的根目录中运行的尝试都会产生以下错误:
nil的未定义方法`each':NilClass(NoMethodError)
完整堆栈跟踪:
/Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/railtie.rb:245:in `each_registered_block': undefined method `each' for nil:NilClass (NoMethodError)
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/railtie.rb:224:in `run_console_blocks'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/application.rb:461:in `block in run_console_blocks'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/engine/railties.rb:13:in `each'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/engine/railties.rb:13:in `each'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/application.rb:461:in `run_console_blocks'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/engine.rb:442:in `load_console'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/commands/console.rb:34:in `initialize'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/commands/console_helper.rb:9:in `new'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/commands/console_helper.rb:9:in `start'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/commands/commands_tasks.rb:78:in `console'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/command.rb:20:in `run'
from /Users/gnerkus/.rvm/gems/ruby-2.2.3@rails-experiments/gems/railties-5.0.0.beta1.1/lib/rails/commands.rb:19:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
我已经railtie.rb在Rails lib 中的文件中跟踪了这个块的错误:
def each_registered_block(type, &block)
klass = self.class
while klass.respond_to?(type)
# The ':console' type doesn't …我将一个来自get查询的id数组传递给knex whereIn函数但它们将丢失.
if(query.cols){
var cols = query.cols.map(Number);
console.log(cols)
search.whereIn('collection_id', cols)
}
我将它们映射到整数以进行查询.控制台日志是......
[ 77, 66 ]
但调试显示查询为...
...and "collection_id" in (?, ?)
我错过了什么？