小编Tlo*_*nXP的帖子

我试图只选择一个特定的字段

exports.someValue = function(req, res, next) {
    //query with mongoose
    var query = dbSchemas.SomeValue.find({}).select('name');

    query.exec(function (err, someValue) {
        if (err) return next(err);
        res.send(someValue);
    });
};

但是在我的json响应中我也收到了_id,我的文档架构只有两个fiels,_id和name

[{"_id":70672,"name":"SOME VALUE 1"},{"_id":71327,"name":"SOME VALUE 2"}]

为什么？？？

我正在尝试安装MySQLdb扩展,但我得到这个错误,任何想法可能是什么原因？可能是有权限的东西？我正在使用Mac OX Lion ....

这是错误的一部分.Django安装正常,但我需要安装此扩展.谢谢你的帮助.

ppp-071ca:MySQL-python-1.2.4b4 miguel_e$ sudo python setup.py install
running install
running bdist_egg
running egg_info
writing MySQL_python.egg-info/PKG-INFO
writing top-level names to MySQL_python.egg-info/top_level.txt
writing dependency_links to MySQL_python.egg-info/dependency_links.txt
writing MySQL_python.egg-info/PKG-INFO
writing top-level names to MySQL_python.egg-info/top_level.txt
writing dependency_links to MySQL_python.egg-info/dependency_links.txt
reading manifest file 'MySQL_python.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'MySQL_python.egg-info/SOURCES.txt'
installing library code to build/bdist.macosx-10.7-intel/egg
running install_lib
running build_py
copying MySQLdb/release.py -> build/lib.macosx-10.7-intel-2.7/MySQLdb
running build_ext
building '_mysql' extension
llvm-gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-       
strict-aliasing -fwrapv …

我正在为我的PDF文档使用NReco .PdfGenerator(该组件基于WkHtmlToPdf工具),我的代码允许我创建一个pdf,调用一个带有参数controller,action,model的函数:

public static byte[] GeneratePdfDocument(System.Web.Mvc.Controller controller, string viewName, object model)
{
     string result;
     controller.ViewData.Model = model;
     using (StringWriter sw = new StringWriter())
     {
         ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext, viewName);
         ViewContext viewContext = new ViewContext(controller.ControllerContext, viewResult.View, controller.ViewData, controller.TempData, sw);
         viewResult.View.Render(viewContext, sw);

         result = sw.ToString();
     }

     return (new NReco.PdfGenerator.HtmlToPdfConverter()).GeneratePdf(result);
}

使用此代码,我可以从我的视图中轻松创建PDF,并且它在我的开发环境中运行良好但在服务器上我收到此错误:

The pipe has been ended.

Description: An unhandled exception occurred during the execution of the    current web request. Please review the stack trace for more information about the error and …

我在地图上有一个类库,它继承了两个新类

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Business" namespace="Business.Test">
<class name="BaseExample" table="base_example" abstract="true" discriminator-value="0">
    <id name="Id" column="id" type="Int64" unsaved-value="0">
        <generator class="native"/>
    </id>
    <discriminator column="domain" type="Int16" not-null="true" force="true" />
    ....
    ....
</class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Business"   namespace="Business.Test">

<subclass name="Example1" extends="BaseExample" discriminator-value="1">
....
....
</subclass>
</hibernate-mapping>

一切正常,但如果我要求那个领域,例如:

var Clients = ClientFactory.GetAll().Where(c => c.UserData.BaseExample.Domain == 1);

抛出此异常:异常消息:无法解析属性:域:Business.Entities.BaseExample

怎么知道它是一类还是另一类？

我使用Bootstrap插件awesome-bootstrap-ckeckbox,我也在使用ASP.NET MVC,然后我的所有复选框都呈现两个输入,一个作为复选框输入,另一个作为隐藏输入,因为我修改了CSS选择器,例:

HTML代码

<div class="checkbox">
   <input id="checkbox1" type="checkbox">
   <input type="hidden" />
   <label for="checkbox1">
      Default
   </label>
</div>
<div class="checkbox checkbox-primary">
   <input id="checkbox2" type="checkbox" checked>
   <input type="hidden" />
   <label for="checkbox2">
       Primary
    </label>
 </div>

CSS代码

/* awesome-bootstrap-checkbox */
.checkbox input[type="checkbox"]:checked + label::after {
  font-family: 'FontAwesome';
  content: "\f00c"; 
}
.checkbox input[type="checkbox"]:disabled + label::before {
    background-color: #eeeeee;
    cursor: not-allowed; 
}
.checkbox-primary input[type="checkbox"]:checked + label::before {
    background-color: #428bca;
    border-color: #428bca; 
}
.checkbox-primary input[type="checkbox"]:checked + label::after {
    color: #fff; 
}

/* my own version */ …

可以问一下你吗？如何在jQuery的.css（）方法中设置负边距（或其他任何值）？我正在按变量添加尺寸，但是不起作用

var width = $('.gallery div img').outerWidth(true);
$('.gallery').css('margin-left', '- ' + width + 'px');

还是有什么方法可以转换var width为负数？