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• Rails 3 Nested Forms with datamapper

  - by jens freudenau

  i have two models: class MeetingPoint include DataMapper::Resource belongs_to :profile property :id, Serial property :lat, String end and class Profile include DataMapper::Resource has n, :meeting_points property :id, Serial property :distance, Text property :created_at, DateTime property :updated_at, DateTime end Now I create a form to edit the profile and the meeting_poing: = form_for @profile do |f| = f.text_field :distance = f.fields_for :meeting_points do |ff| = ff.text_field :lat = f.submit But when I want to save the values I get always the error: "undefined method `readonly?' for ["lat", "14.000"]:Array"

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• How can I list the properties of an object programmatically in VB6?

  - by Gregory Higley

  A friend of mine is working on a legacy VB6 project. I haven't touched that language in ten years, so I'm pretty rusty. Anyway, is there any kind of reflection API for VB6? Specifically, he needs a way to iterate the properties (and types) of a user-created Class. (In other words, not an external COM object, but an internal "Class Module" as it's called.) How can this be done?

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• custom view with layout

  - by user270811

  ok, what i am trying to do is to embed a custom view in the default layout main.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <com.lam.customview.CustomDisplayView android:id="@+id/custom_display_view1" android:layout_width="fill_parent" android:layout_height="fill_parent" /> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:id="@+id/prev" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="50" android:textAppearance="?android:attr/textAppearanceSmall" android:text="@string/prev" /> </LinearLayout> </LinearLayout> as you can see the class is called com.lam.customview.CustomDisplayView, with the id of custom_display_view1. now in the com.lam.customview.CustomDisplayView class, i want to use another layout called custom_display_view.xml because i don't want to programmatically create controls/widgets. custom_display_view.xml is just a button and an image, the content of which i want to change based on certain conditions: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/display_text_view1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <ImageView android:id="@+id/display_image_view1" android:layout_width="wrap_content" android:layout_height="wrap_content"> </ImageView> </LinearLayout> i tried to do: 1) public CustomDisplayView(Context context, AttributeSet attrs) { super(context, attrs); try { // register our interest in hearing about changes to our surface SurfaceHolder holder = getHolder(); holder.addCallback(this); View.inflate(context, R.layout.custom_display_view, null); ... but got this error, "03-08 20:33:15.711: ERROR/onCreate(10879): Binary XML file line #8: Error inflating class java.lang.reflect.Constructor ". 2) public CustomDisplayView(Context context, AttributeSet attrs) { super(context, attrs); try { // register our interest in hearing about changes to our surface SurfaceHolder holder = getHolder(); holder.addCallback(this); View.inflate(context, R.id.custom_display_view1, null); ... but got this error, "03-08 20:28:47.401: ERROR/CustomDisplayView(10806): Resource ID #0x7f050002 type #0x12 is not valid " also, if i do it this way, as someone has suggested, it's not clear to me how the custom_display_view.xml is associated with the custom view class. thanks.

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• How to trigger binding source update from code in WPF?

  - by Benny

  In My ViewModel class I have a property: class ViewModel { public string FileName {get;set;} } and in my View I bind a label's content to ViewModel's FileName. now When I do drag-drop a file to my View, How can I update the label's Content property, so that the ViewMode's FileName also get updated via binding? Directly set the label's Content property won't work, it just simply clear the binding.

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• Custom RIA Authentication

  - by cmaduro

  Following the steps in this post: http://forums.silverlight.net/forums/t/177042.aspx Where/How do I add the [Key] attribute on the Name property of the IAuthentication where User is one of my ADO.Net Entity objects? My options so far seem to be: In the designer codebehind of me ADO.Net Entity Model. Create a partial User class and add it there In the AuthenticationService.metadata.cs partial User class. It just does not seem to work no matter where I place the [Key] attribute.

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• Using Simple_Html_Dom Find Function PHP

  - by Belgin Fish

  Hi, for a while I've been using the simple_html_dom include, but I have a question. with the find function, i've been using $something-find('table[class="class_name"]', 0); and things like that, but I don't know how to specify two things, like $something-find('table[class="class_name"][bgcolor="#ffffff"]', 0); How would that work? (that example doesn't work)

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• Can Windsor do this?

  - by Marius

  Consider this example: public class Factory { private List<ISubFactory> subFactories; public Factory(List<ISubFactory> subFactories) { this.subFactories = subFactories; } } public interface ISubFactory { } I want Windsor to resolve the Factory class and put all implementers of the ISubFactory interface which are registered in the container (ResolveAll) into the "subFactories" parameter, can Windsor do this?

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• cant access nested ressource 'comments' in rails 3.0.1

  - by DannyRe

  Hey, I hope you can help me. /config/routes.rb resources :deadlines do resources :comments end /model/comment.rb class Comment < ActiveRecord::Base belongs_to :post, :class_name = "Post", :foreign_key = "post_id" end /model/post.rb class Post < ActiveRecord::Base has_many :comments end When I want to visit: http://localhost:3000/posts/1/comments/new it says: undefined method `comments_path' for #<#:0x4887138 in _form.html I use 'formtastic' and the _form.html.erb looks like this: <% semantic_form_for [@comment] do |form| % <% form.inputs do % <%= form.input :content % <% end % <% form.buttons do % <%= form.commit_button % <% end % <% end %

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• How to wrap Java String.format()?

  - by BlinK_

  Hey everyone, I would like to wrap the String.format() method with in my own Logger class. I can't figure a way how to pass arguments from my method to String.format(). public class Logger { public static void format(String format, Object... args) { print(String.format(format, args)); // <-- this gives an error obviously. } public static void print(String s) { System.out.println(s); } }

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• Django - Better evaluation of relationship at the model level

  - by Brant

  Here's a simple relational pair of models. class Shelf(models.Model): name = models.CharField(max_length=100) def has_books(self): if Book.objects.filter(shelf=self): return True else: return False class Book(models.Model): shelf = models.ForeignKey(Shelf) name = models.CharField(max_length=100) Is there a better (or alternative) way to write the "has_book" method? I'm not a fan of the double database hit but I want to do this at the model level.

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• Java declarations (ordering)

  - by incrediman

  In Java, what's generally the most accepted way to organize a class in terms of the order in which declared data members and methods should be listed in the class file, keeping in mind the following and anything else you can think of for each one: its visibility whether it's a constructor, method, or member if it's a method, does it overload, or override other method(s)?

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• How to create aliases in c#

  - by Gaddigesh

  How do i create aliases in c# Take this scenario class CommandMessages { string IDS_SPEC1_COMPONENT1_MODULE1_STRING1; } say i create an object of this class CommandMessages objCommandMessage = new CommandMessages(); To i need to write lengthy string objCommandMessage.IDS_SPEC1_COMPONENT1_MODULE1_STRING1 every time i access the variable, this is a pain as i am using this variable as a key for a dictionary. Dict[objCommandMessage.IDS_SPEC1_COMPONENT1_MODULE1_STRING1] therefore i should be able to do something like this Dict[str1] where str1 is alias for objCommandMessage.IDS_SPEC1_COMPONENT1_MODULE1_STRING1, How do i do it?

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• JSON serialization of Google App Engine models

  - by user111677

  I've been search for quite a while with no success. My project isn't using Django, is there a simple way to serialize App Engine models (google.appengine.ext.db.Model) into JSON or do I need to write my own serializer? My model class is fairly simple. For instance: class Photo(db.Model): filename = db.StringProperty() title = db.StringProperty() description = db.StringProperty(multiline=True) date_taken = db.DateTimeProperty() date_uploaded = db.DateTimeProperty(auto_now_add=True) album = db.ReferenceProperty(Album, collection_name='photo') Thanks in advance.

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• Why does my C++ LinkedList cause a EXC_BAD_ACCESS?

  - by Anthony Glyadchenko

  When I call the cmremoveNode method in my LinkedList from outside code, I get an EXC_BAD_ACCESS. /* * LinkedList.h * Lab 6 * * Created by Anthony Glyadchenko on 3/22/10. * Copyright 2010 __MyCompanyName__. All rights reserved. * */ #include <stdio.h> #include <iostream> #include <fstream> #include <iomanip> using namespace std; class ctNode { friend class ctlinkList ; // friend class allowed to access private data private: string sfileWord ; // used to allocate and store input word int iwordCnt ; // number of word occurrances ctNode* ctpnext ; // point of Type Node, points to next link list element }; class ctlinkList { private: ctNode* ctphead ; // initialized by constructor public: ctlinkList () { ctphead = NULL ; } ctNode* gethead () { return ctphead ; } string cminsertNode (string svalue) { ctNode* ctptmpHead = ctphead ; if ( ctphead == NULL ) { // allocate new and set head ctptmpHead = ctphead = new ctNode ; ctphead -> ctpnext = NULL ; ctphead -> sfileWord = svalue ; } else { //find last ctnode do { if ( ctptmpHead -> ctpnext != NULL ) ctptmpHead = ctptmpHead -> ctpnext ; } while ( ctptmpHead -> ctpnext != NULL ) ; // fall thru found last node ctptmpHead -> ctpnext = new ctNode ; ctptmpHead = ctptmpHead -> ctpnext ; ctptmpHead -> ctpnext = NULL ; ctptmpHead -> sfileWord = svalue ; } return ctptmpHead -> sfileWord ; } string cmreturnNode (string svalue) { return NULL; } string cmremoveNode (string svalue) { if (ctphead == NULL) return NULL; ctNode *tmpHead = ctphead; while (tmpHead->sfileWord != svalue || tmpHead->ctpnext != NULL){ tmpHead = tmpHead->ctpnext; } if (tmpHead == NULL){ return NULL; } else { while (tmpHead != NULL){ tmpHead = tmpHead->ctpnext; } } return tmpHead->sfileWord; } string cmlistList () { string tempList; ctNode *tmpHead = ctphead; if (ctphead == NULL){ return NULL; } else{ while (tmpHead != NULL){ cout << tmpHead->sfileWord << " "; tempList += tmpHead->sfileWord; tmpHead = tmpHead -> ctpnext; } } return tempList; } }; Why is this happening?

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• jQuery multiple running totals

  - by Benjamin Randal

  0I am using jQuery to calculate a running total on multiple textboxes. Just found an awesome response on how to get that working a few days ago, but now I am running into another problem. When using one selector, the total for GetTotal is calculated perfectly. However, when I include the second selector, the totals begin to conflict with one another, and no longer calculate properly. I have been searching for a solution to this for some time now, does anyone have any ideas? Here is the selector i am currently using: function GetTotal(txtBox) { var total = 0; $('input:text').each(function(index, value) { total += parseInt($(value).val() || 0); }); $("#chkTotal").html(total); } My view uses these txt boxes <div class="editor-field"> @Html.TextBox("Field1", String.Empty, new {InputType = "text", id = "field1", onchange = "GetTotal(this)" }) </div> <div class="editor-field"> @Html.TextBox("Field2", String.Empty, new {InputType = "text", id = "field2", onchange = "GetTotal(this)" }) </div> <div> <h3>Total Checked</h3> </div> <div id="chkTotal"></div> Now I am trying to implement another selector which will total two additional editor fields... function GetTotal1(txtBox) { var total1 = 0; $('input:text').each(function (index, value) { total1 += parseInt($(value).val() || 0); }); $("#disTotal").html(total1); } View: <div class="editor-field"> @Html.TextBox("Field3", String.Empty, new {InputType = "text", id = "field3", onchange = "GetTotal1(this)" }) </div> <div class="editor-field"> @Html.TextBox("Field4", String.Empty, new {InputType = "text", id = "field4", onchange = "GetTotal1(this)" }) </div> <div> <h3>Total Distributed</h3> </div> <div id="disTotal"></div>

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• Can SerialVersionUid be any number or does it have to be compiler generated?

  - by pdeva

  If I write a serialversionUid for my class as say 1234, and I know that no other class in my program uses that, is that fine or do i always have to use a uid generated by the compiler?

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• Django: How do I prepend

  - by voidnothings

  Hello, I'm exploring Django and got this particular problem. How do I prepend <span class="label">Note:</span> inside {{article.content_html|safe}}? The content of {{article.content_html|safe}} are paragraph blocks, and I just wanna add <span class="label">Note:</span> in the very first paragraph. Thanks!

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• wrong operator() overload called

  - by user313202

  okay, I am writing a matrix class and have overloaded the function call operator twice. The core of the matrix is a 2D double array. I am using the MinGW GCC compiler called from a windows console. the first overload is meant to return a double from the array (for viewing an element). the second overload is meant to return a reference to a location in the array (for changing the data in that location. double operator()(int row, int col) const ; //allows view of element double &operator()(int row, int col); //allows assignment of element I am writing a testing routine and have discovered that the "viewing" overload never gets called. for some reason the compiler "defaults" to calling the overload that returns a reference when the following printf() statement is used. fprintf(outp, "%6.2f\t", testMatD(i,j)); I understand that I'm insulting the gods by writing my own matrix class without using vectors and testing with C I/O functions. I will be punished thoroughly in the afterlife, no need to do it here. Ultimately I'd like to know what is going on here and how to fix it. I'd prefer to use the cleaner looking operator overloads rather than member functions. Any ideas? -Cal the matrix class: irrelevant code omitted class Matrix { public: double getElement(int row, int col)const; //returns the element at row,col //operator overloads double operator()(int row, int col) const ; //allows view of element double &operator()(int row, int col); //allows assignment of element private: //data members double **array; //pointer to data array }; double Matrix::getElement(int row, int col)const{ //transform indices into true coordinates (from sorted coordinates //only row needs to be transformed (user can only sort by row) row = sortedArray[row]; result = array[usrZeroRow+row][usrZeroCol+col]; return result; } //operator overloads double Matrix::operator()(int row, int col) const { //this overload is used when viewing an element return getElement(row,col); } double &Matrix::operator()(int row, int col){ //this overload is used when placing an element return array[row+usrZeroRow][col+usrZeroCol]; } The testing program: irrelevant code omitted int main(void){ FILE *outp; outp = fopen("test_output.txt", "w+"); Matrix testMatD(5,7); //construct 5x7 matrix //some initializations omitted fprintf(outp, "%6.2f\t", testMatD(i,j)); //calls the wrong overload }

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• invoking proc with instance_eval with arguments

  - by dorelal

  I know this works proc = Proc.new do puts self.hi + ' world' end class Usa def hi "Hello!" end end Usa.new.instance_eval &proc However I want to pass arguments to proc. So I tried this which does not work. Can anyone help me make following work. proc = Proc.new do |greeting| puts self.hi + gretting end class Usa def hi "Hello!" end end Usa.new.instance_eval &proc, 'world' # does not work Usa.new.instance_eval &proc('world') # does not work

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• How to map Duration type with JPA

  - by HDave

  I have a property field in a class that is of type javax.xml.datatype.Duration. It basically represents a time span (e.g. 4 hours and 34 minutes). JPA is telling me it is an invalid type, which doesn't shock me. Whats a good solution this? I could implement my own Duration class, but I don't know how to get JPA to "accept" it as a datatype.

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• How can I solve out of memory exception in generic list generic ?

  - by Phsika

  How can i solve out of memory exception in list generic if adding new value foreach(DataColumn dc in dTable.Columns) foreach (DataRow dr in dTable.Rows) myScriptCellsCount.MyCellsCharactersCount.Add(dr[dc].ToString().Length); MyBase Class: public class MyExcelSheetsCells { public List<int> MyCellsCharactersCount { get; set; } public MyExcelSheetsCells() { MyCellsCharactersCount = new List<int>(); } }

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• what happens if "== operator is not defined"?

  - by Behrooz

  class a { int variable = 0; } class b { void proc() { a ref1 = new a(); a ref2 = new a(); bool cmp1 = ref1 == ref2;//? bool cmp2 = ref1 == ref1;//? } } does it differ when working with structs? how about marshaled(System.Runtime.Remoting.*) objects(singletons)?

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• What's the best way to reference a .DLL - as a normal reference or as a web service?

  - by dotnetdev

  Hi, What is the best way to reference an existing .NET dll (Class library)? Is there any benefit to expose web services from the class library and reference these as opposed to referencing the actual .dll (Although one benefit of the web service approach is the granularity and thus surface area exposed is up to you at coding time)? I am thinking with loose coupling in mind, as a criteria. Thanks

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• pop a frame

  - by somya agrawal

  I am working on a project (Java, Swing) in which i have to pop a frame on clicking a hyperlink. but the coding for the frame and all its components is done in a different class and that hyperlink exists in a different class. what shall i do to pop that frame on clicking of the hyperlink please tell. thanks.

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• NullPointerException using datanucleus-json with S3

  - by Matt

  I'm using datanucleus 3.2.7 from Maven, trying to use the Amazon S3 JPA provider. I can successfully write data into S3, but querying either by using "SELECT u FROM User u" or "SELECT u FROM User u WHERE id = :id" causes a NullPointerException to be thrown. Using the RDBMS provider, everything works perfectly. Is there something I'm doing wrong? Main.java EntityManagerFactory factory = Persistence.createEntityManagerFactory("MyUnit"); EntityManager entityManager = factory.createEntityManager(); Query query = entityManager.createQuery("SELECT u FROM User u", User.class); List<User> users = query.getResultList(); // Null pointer exception here for(User u:users) System.out.println(u); User.java package test; import javax.persistence.*; @Entity @Table(name = "User") public class User { @Id public String id; public String name; public User(String id, String name) { this.id = id; this.name = name; } public String toString() { return id+" : "+name; } } persistence.xml <?xml version="1.0" encoding="UTF-8" ?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="MyUnit"> <class>test.User</class> <exclude-unlisted-classes /> <properties> <properties> <property name="datanucleus.ConnectionURL" value="amazons3:http://s3.amazonaws.com/" /> <property name="datanucleus.ConnectionUserName" value="xxxxx" /> <property name="datanucleus.ConnectionPassword" value="xxxxx" /> <property name="datanucleus.cloud.storage.bucket" value="my-bucket" /> </properties> <property name="datanucleus.autoCreateSchema" value="true" /> </properties> </persistence-unit> </persistence> Exception java.lang.NullPointerException at org.datanucleus.NucleusContext.isClassWithIdentityCacheable(NucleusContext.java:1840) at org.datanucleus.ExecutionContextImpl.getObjectFromLevel2Cache(ExecutionContextImpl.java:5287) at org.datanucleus.ExecutionContextImpl.getObjectFromCache(ExecutionContextImpl.java:5191) at org.datanucleus.ExecutionContextImpl.findObject(ExecutionContextImpl.java:3137) at org.datanucleus.store.json.CloudStoragePersistenceHandler.getObjectsOfCandidateType(CloudStoragePersistenceHandler.java:367) at org.datanucleus.store.json.query.JPQLQuery.performExecute(JPQLQuery.java:94) at org.datanucleus.store.query.Query.executeQuery(Query.java:1786) at org.datanucleus.store.query.Query.executeWithMap(Query.java:1690) at org.datanucleus.api.jpa.JPAQuery.getResultList(JPAQuery.java:194) at test.Main.main(Main.java:16)

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