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.
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 …我有一个数据库
id | parentid | name
1 | 0 | CatOne
2 | 0 | CatTwo
3 | 0 | CatThree
4 | 1 | SubCatOne
5 | 1 | SubCatOne2
6 | 3 | SubCatThree
我怎样才能选择该猫排序id,parentid？那是
CatOne 1
--SubCatOne 4
--SubCatOne2 5
CatTwo 2
CatThree 3
--SubCatThree 6
如何将我的Procfile中的ember-cli生成的应用程序部署到Heroku？
=== web (1X): `ember server`
web.1: crashed 2014/04/10 13:19:57 (~ 48s ago)
=== web (1X): `npm start`
web.1: crashed 2014/04/10 13:22:11 (~ 2m ago)
1.8.3我在安装gem的版本时遇到错误json：
dyld: lazy symbol binding failed: Symbol not found: _rb_str_new_static
Referenced from: /Users/gnerkus/.rvm/gems/ruby-2.2.3/gems/json- 1.8.3/lib/json/ext/parser.bundle
Expected in: flat namespace
建议在安装的json 问题线程中使用libgmp3-dev。
有在 Linux 上安装它的说明，但我找不到在 OSX 上安装它的任何说明。
我正在使用Active Model Serializers v0.10.0.rc4
我想产生看起来像这样的json：
{
"posts": [
{ "post": {"id": 2, "name": "foo"} },
{ "post": {"id": 3, "name": "bar"} }
],
"next_page": 3
}
我知道基本的：
render json: posts, each_serializer: PostSerializer
将产生这样的json：
[
{"id": 2, "name": "foo"}
{"id": 3, "name": "bar"}
]
我尝试了以下操作：
控制器：
render json: posts, serializer: PostsSerializer
posts_serializer：
class PostsSerializer < ActiveModel::Serializer
attributes :posts, :next_page
def posts
ActiveModel::Serializer::CollectionSerializer.new(object,
each_serializer: PostSerializer,
root: "post"
)
end
def next_page
3
end
end
但这会产生如下的json：
{
"posts": [
{
"object": {"id": 2, …这是我正在测试的代码
eventsApp.factory('userData', ['userResource', function(userResource){
return{
getUser: function(userName, callback){
return userResource.get({userName:userName}, function(user){
if(callback)
callback(user);
});
};
}]);
这是茉莉花的测试
describe('userData', function(){
var mockUserResource;
beforeEach(module('eventsApp'));
beforeEach(function(){
mockUserResource = {get: function(){} };
module(function($provide){
$provide.value('userResource', mockUserResource);
});
});
it('should make a call to userResource.get with provided userName', inject(function(userData){
userData.getUser('Bob');
spyOn(mockUserResource, 'get');
expect(mockUserResource.get).toHaveBeenCalledWith({userName:'Bob'});
}));
});
为什么这会失败？它说
"预期的间谍得到了[{userName:'Bob'}的调用,但从未被称为".
.toHaveBeenCalled() 也失败了.
我不喜欢, ,这里:
let colors = [ "red", "green", "blue" ];
let [ , , thirdColor] = colors;
我可以使用一些占位符字符吗？我宁愿不介绍未使用的变量,我只想让代码看起来更清晰.现在我唯一可以考虑的是评论:
let [/*first*/, /*second*/, thirdColor] = colors;
有更好的想法吗？
我有这个猫鼬的模式：
var UserSchema = new Schema({
"name":String,
"gender":String,
});
我想添加另一个名为image的字段。如果性别为male，则此图像将具有默认值，如果性别为，则它将具有另一个默认值female。我发现可以使用以下方式设置默认值：
image: { type: ObjectId, default: "" }
但是我找不到如何设置条件的方法。
有没有人为开罗图书馆提供C#包装？我需要它用于在我的程序上呈现PDF文件预览(在Mono中的Windows和Mac中)？