On Fri, Apr 17, 2009 at 2:00 AM, Amit Kumar Verma <cdac.a...@gmail.com>wrote:
>
> Hi David,
>
> thanks, this is working fine. Problem is resolved.
>
> But dynamic binding is feature of java then why Scala don't support
> this.
I'm sorry, I don't understand what dynamic binding is. Scala supports
casting just like Java.
>
> This is an important feature.
>
> Thanks again
> Amit Kumar Verma
>
> On Apr 13, 10:10 pm, David Pollak <feeder.of.the.be...@gmail.com>
> wrote:
> > I think it's best to use the built-in JSON creation code and keep the
> code
> > as JsCmd as long as possible.
> >
> > Here's a snippet that will place the JSON for all the Users in the page.
> > I'm including the whole project as well:
> >
> > class HelloWorld {
> > def json: NodeSeq = Script(jsonForAll(User))
> >
> > private def jsonForAll[T <: Mapper[T]](meta: MetaMapper[T]): JsCmd =
> > JsArray(meta.findAll.map(_.asJs) :_*)
> >
> > }
> >
> > If you have further questions, please update the project and mark the
> places
> > in the code where you have a question and we'll work from there.
> >
> > Thanks,
> >
> > David
> >
> > On Mon, Apr 13, 2009 at 2:07 AM, Amit Kumar Verma <cdac.a...@gmail.com
> >wrote:
> >
> >
> >
> >
> >
> > > Hi David,
> >
> > > Thanks for ur replies, I just want to make a generic function which
> > > will take an object of mapper and returns the json string of the same.
> >
> > > I have written only two function
> > > 1. This will be called by ajax call :
> >
> > > def getJSONString(xhtml: Group):NodeSeq = {
> > > getJSONStringGeneric(TestGearLogin) // here 'TestGearLogin' is
> > > a mapper object
> > > }
> >
> > > 2. function to make JSON string i.e
> >
> > > def getJSONStringGeneric(anyObject :Any):NodeSeq = {
> >
> > > var sJSONString = "{\"bindings\": [";
> >
> > > anyObject match {
> > > case mm: MetaMapper[_] => // this line is giving error
> > > mm.findAll.map(userdetails => {
> >
> > > var tempJSON = "";
> >
> > > val ret = new StringBuilder
> >
> > > ret.append("{")
> > > ret.append(userdetails.getSingleton.appendFieldToStrings
> > > (userdetails))
> > > ret.append("}")
> >
> > > tempJSON = ret.toString();
> >
> > > // some manipulation for making correct JSON
> > > tempJSON = tempJSON.replaceAll("\\{","\\{\"");
> > > tempJSON = tempJSON.replaceAll("\\}","\"\\}");
> > > tempJSON = tempJSON.replaceAll("=","\":\"");
> > > tempJSON = tempJSON.replaceAll("," , "\",\"");
> > > tempJSON += ",";
> >
> > > sJSONString +=tempJSON
> > > });
> > > }
> >
> > > sJSONString = sJSONString.substring(0,sJSONString.length-1); //
> > > for slicing the last comma
> > > sJSONString += "]}";
> >
> > > Text(sJSONString);
> > > }
> >
> > > I changed the code as you suggested but getting the error as I posted.
> > > Please advise.
> >
> > > Thanks
> > > Amit Kumar Verma
> >
> > > On Apr 10, 9:46 pm, David Pollak <feeder.of.the.be...@gmail.com>
> > > wrote:
> > > > I think the .asJs method on all Mapper instances should give you the
> > > object
> > > > in JavaScript representation.
> > > > If you can post an entire file, I can work on helping you if the
> above
> > > > doesn't work.
> >
> > > > On Thu, Apr 9, 2009 at 6:53 AM, Amit Kumar Verma <
> cdac.a...@gmail.com
> > > >wrote:
> >
> > > > > copied the the same code but getting this error
> >
> > > > > type arguments [_] do not conform to trait MetaMapper's type
> parameter
> > > > > bounds [A <: net.liftweb.mapper.Mapper[A]]
> > > > > TravelMerchantTest/src/main/
> > > > > scala/com/vtech/travelmerchant/snippet default.scala line 142
> > > > > 1239284830763 85593
> >
> > > > > Actually I am trying to make the JSON object using a mapper object.
> My
> > > > > function is this :
> >
> > > > > def getJSONStringGeneric(anyObject :Any):NodeSeq = {
> >
> > > > > //Console.println("anyObject.getClass ::::::::
> > > > > "+anyObject.getClass);
> >
> > > > > //Console.println("anyObject.getClass.getName ::::::::
> > > > > "+anyObject.getClass.getName);
> >
> > > > > //var objTemp = anyObject.asInstanceOf[MetaMapper
> > > > > [TestGearLogin]];
> >
> > > > > var sJSONString = "{\"bindings\": [";
> >
> > > > > anyObject match {
> > > > > case mm: MetaMapper[_] =>
> > > > > mm.findAll.map(
> > > > > (userdetails: Mapper[_]) =>{
> >
> > > > > var tempJSON = "";
> >
> > > > > val ret = new StringBuilder
> >
> > > > > ret.append("{")
> >
> > > > >
> ret.append(userdetails.getSingleton.appendFieldToStrings
> > > > > (userdetails))
> >
> > > > > ret.append("}")
> >
> > > > > // ret will be like
> > > > > {username=222,password=222,audit_dt=2009-04-06
> > > > > 00:00:00.0,login_pid=26}
> >
> > > > > tempJSON = ret.toString();
> >
> > > > > tempJSON = tempJSON.replaceAll("\\{","\\{\"");
> > > > > tempJSON = tempJSON.replaceAll("\\}","\"\\}");
> > > > > tempJSON = tempJSON.replaceAll("=","\":\"");
> > > > > tempJSON = tempJSON.replaceAll("," , "\",\"");
> > > > > tempJSON += ",";
> >
> > > > > sJSONString +=tempJSON
> > > > > }
> > > > > )
> > > > > }
> >
> > > > > sJSONString = sJSONString.substring(0,sJSONString.length-1);
> //
> > > > > for slicing the last comma
> > > > > sJSONString += "]}";
> >
> > > > > Text(sJSONString);
> > > > > }
> >
> > > > > but not getting a way of doing this. Please advise.
> >
> > > > > Thanks
> > > > > Amit Kumar Verma
> >
> > > > > On Apr 9, 6:14 pm, David Pollak <feeder.of.the.be...@gmail.com>
> wrote:
> > > > > > Howdy,
> > > > > > Scala is a static language, so the class for casting must be
> known at
> > > > > > compile time. It's not possible to construct a String at runtime
> and
> > > > > cast
> > > > > > an object into a class represented by that String.
> >
> > > > > > However, casting to a known class is easy in Scala... and it's
> done
> > > > > > primarily using pattern matching. The following code:
> >
> > > > > > def foo(in: Any) = in match {
> > > > > > case mm: MetaMapper[_] =>
> > > > > > mm.findAll.map(
> > > > > > (m: Mapper[_]) =>
> > > > > > m.asJs
> > > > > > )
> > > > > > case _ =>
> > > > > > }
> >
> > > > > > Does what I think you want. It takes an incoming instance, in
> and
> > > > > matches
> > > > > > it against being an instance of MetaMapper[_]. This means its
> some
> > > type
> > > > > of
> > > > > > MetaMapper (we don't know or care what the type parameter is).
> If it
> > > is
> > > > > a
> > > > > > MetaMapper, it's assigned to the mm variable. We can then call
> > > findAll
> > > > > on
> > > > > > that variable and we have a bunch of Mapper[_] instances. Note
> that
> > > I
> > > > > > explicitly called out the type of m in the function, but that
> line
> > > could
> > > > > be
> > > > > > re-written mm.findAll.map(m => m.asJs) because the compiler
> infers
> > > the
> > > > > type
> > > > > > of m.
> >
> > > > > > Does this help?
> >
> > > > > > Thanks,
> >
> > > > > > David
> >
> > > > > > On Thu, Apr 9, 2009 at 3:55 AM, Amit Kumar Verma <
> > > cdac.a...@gmail.com
> > > > > >wrote:
> >
> > > > > > > Hi All,
> >
> > > > > > > I am trying to type cast an scala object to its mapper object
> >
> > > > > > > 1 def getJSONString(anyObject :Object):NodeSeq = {
> >
> > > > > > > 2 var obj =
> anyObject.asInstanceOf[anyObject.getClass
> > > > > > > ().getName()];
> >
> > > > > > > 3 obj.findAll.map(userdetails => {
> > > > > > > // some code will go here
> > > > > > > }
> > > > > > > Text("any string")
> > > > > > > }
> >
> > > > > > > but i am getting erroe as "expected [ but found (" on line 2.
> >
> > > > > > > please help me to typecast the object to its mapper object.
> >
> > > > > > > Thanks
> > > > > > > Amit Kumar Verma
> >
> > > > > > --
> > > > > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > > > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > > > > Follow me:http://twitter.com/dpp
> > > > > > Git some:http://github.com/dpp
> >
> > > > --
> > > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > > Follow me:http://twitter.com/dpp
> > > > Git some:http://github.com/dpp
> >
> > --
> > Lift, the simply functional web frameworkhttp://liftweb.net
> > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > Follow me:http://twitter.com/dpp
> > Git some:http://github.com/dpp
> >
> > json.tgz
> > 7KViewDownload
>
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp
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