lift

问题 I start reading Lift framework source code, I find that there're so many methods are defined using a name like methodName_? , is there a convention that _? has some special meaning? def empty_? : Boolean = {} 回答1: The ? denotes that this is a predicate, a function returning Boolean . This convention goes back to Lisp, where ? (Scheme), p or -p (other Lisps, simulating the question mark with a "similar" letter) also denote predicates. Think of it as asking a question, "is the object empty?"

问题 I am developing an ecommerce site in Lift with MongoDB I need to store some data for product prices My question is this: What field type should I use in MongoDB if I want to store data type BigDecimal In mapper is a field of type: MappedDecimal, but in net.liftweb.mongodb.record.field no equivalent How I can to store this information? Thank you all for your attention and help 回答1: As of MongoDB v2.6 there is no fixed-places decimal type. The data has to be saved in a field of a different type

问题 I deployed example.war to Tomcat 6.0.32 (latest at time of writing), and the deployed webapp contains the following: $ find example | egrep -v "WEB-INF/lib|WEB-INF/classes" example example/_items.html example/_share_link.html example/all_items.html example/images example/images/ajax-loader.gif example/index.html example/item example/item/star.html example/item.html example/js example/js/c-jquery-1.4.2.js example/js/c-jquery-ui-1.8.2.js example/js/jquery-1.4.2.js example/js/jquery-1.4.4.min.js

问题 This page: http://www.assembla.com/wiki/show/liftweb/Using_SBT describes how to override the jetty port for lift webapps: override val jettyPort = 8081 but doesn't state the file that this override should be defined in. 回答1: In the project/build/ProjectNameProject.scala file: import sbt._ class ProjectNameProject(info: ProjectInfo) extends DefaultWebProject(info) { // other configuration override val jettyPort = 8081 } The jettyPort is defined in the DefaultProject.scala file of SBT. See here

问题 I'm new to scala. I'm trying to make simple manipulations with json files. I'm stucked with the following task: how can I ellegant remove field with defined name within object with defined name. As an example I'd like to delete dsc1 field from the object name2 { "group": { "name1":{ "dsc":"some dsc", "dsc1":"some dsc", "dsc2":"some dsc" }, "name2":{ "dsc":"some dsc", "dsc1":"some dsc", "dsc2":"some dsc" } } } For parsing I'm using liftweb. I've cteate the following code but it deletes all

问题 I'm new to scala. I'm trying to make simple manipulations with json files. I'm stucked with the following task: how can I ellegant remove field with defined name within object with defined name. As an example I'd like to delete dsc1 field from the object name2 { "group": { "name1":{ "dsc":"some dsc", "dsc1":"some dsc", "dsc2":"some dsc" }, "name2":{ "dsc":"some dsc", "dsc1":"some dsc", "dsc2":"some dsc" } } } For parsing I'm using liftweb. I've cteate the following code but it deletes all

问题 I am currently implementing a graph using d3 and a json object for data. A working example of such a graph can be found here: http://bl.ocks.org/950642. If you know d3 you can certainly directly jump to the My Problem part. Quick overview of code So, basically in my template I have the minimum code necessary: <div id="main" class="lift:surround?with=default;at=content"> <div class="lift:GraphVisual.showGraph"></div> </div> Then in my snippet ( GraphVisual.scala ) I have the following: def

问题 I am working on a Lift project and trying to compile it with scala:cc and the scala compilation server using the jvm args: -Xmx1024m -Xss20m -XX:PermSize=64M -XX:MaxPermSize=512M -XX:+CMSClassUnloadingEnabled -XX:+CMSClassUnloadingEnabled The error also occurs with the jvm args: -Xmx1024m -Xss20m -XX:PermSize=64M -XX:MaxPermSize=512M The result is: [INFO] Compiling 16 source files to /Users/axaluss/IdeaProjects/trunk/Team_Skynet/target/classes at 1299141180948 [ERROR] java.lang

问题 How can I hightlight the parent menu item of the current page? I have a site map as follows: val siteMap = SiteMap( Menu("Home") / "index", Menu("Search") / "search" submenus ( Menu("Search Results") / "search-results") >> Hidden) and I use it as follows: <lift:Menu.builder ul:class="tabs" li_item:class="selected" /> However, when I navigate to the /search-results - the search menu item is no longer selected (i.e. the css class selected is no longer applied to it). Any tips? 回答1: it's quite

问题 I'm new with scala and lift but I already got the pocketchangeapp up and running and playing around with the RestAPI thing in it. Now I created a new project and it worked quite well until last night. I made my latest changes and commited them in svn but hat a problem with my workspace so I deleted my projects and did a checkout of the Project in svn. Since I did that my imports of net.liftweb._ (any classes also if I write the exact class name) only return an error in eclipse: import net