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  • can't save form content to database, help plsss!!

    - by dana
    i'm trying to save 100 caracters form user in a 'microblog' minimal application. my code seems to not have any mystakes, but doesn't work. the mistake is in views.py, i can't save the foreign key to user table models.py looks like this: class NewManager(models.Manager): def create_post(self, post, username): new = self.model(post=post, created_by=username) new.save() return new class New(models.Model): post = models.CharField(max_length=120) date = models.DateTimeField(auto_now_add=True) created_by = models.ForeignKey(User, blank=True) objects = NewManager() class NewForm(ModelForm): class Meta: model = New fields = ['post'] # widgets = {'post': Textarea(attrs={'cols': 80, 'rows': 20}) def save_new(request): if request.method == 'POST': created_by = User.objects.get(created_by = user) date = request.POST.get('date', '') post = request.POST.get('post', '') new_obj = New(post=post, date=date, created_by=created_by) new_obj.save() return HttpResponseRedirect('/') else: form = NewForm() return render_to_response('news/new_form.html', {'form': form},context_instance=RequestContext(request)) i didn't mention imports here - they're done right, anyway. my mistake is in views.py, when i try to save it says: local variable 'created_by' referenced before assignment it i put created_py as a parameter, the save needs more parameters... it is really weird help please!!

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  • Events + Adapter Pattern

    - by Stretto
    I have an adapter pattern on a generic class that essentially adapts between types: class A<T> { event EventHandler e; } class Aadapter<T1, T2> : A<T1> { A<T2> a; Aadapter(A<T2> _a) { a = _a; } } The problem is that A contains an event. I effectively want all event handlers assigned to Adapter to fall through to a. It would be awesome if I could assign the a's event handler to adapter's event handler but this is impossible? The idea here is that A is almost really just A but we need a way to adapt the them. Because of the way event's work I can't how to efficiently do it except manually add two event handlers and when they are called they "relay" the to the other event. This isn't pretty though and it would seem much nicer if I could have something like class A<T> { event EventHandler e; } class Aadapter<T1, T2> : A<T1> { event *e; A<T2> a; Aadapter(A<T2> _a) { a = _a; e = a.e; } } in a sense we have a pointer to the event that we can assign a2's event to. I doubt there is any simple way but maybe someone has some idea to make it work. (BTW, I realize this is possible with virtual events but I'd like to avoid this if at all possible)

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  • Why timed lock doesnt throws a timeout exception in C++0x?

    - by Vicente Botet Escriba
    C++0x allows to lock on a mutex until a given time is reached, and return a boolean stating if the mutex has been locked or not. template <class Clock, class Duration> bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); In some contexts, I consider an exceptional situation that the locking fails because of timeout. In this case an exception should be more appropriated. To make the difference a function lock_until could be used to get a timeout exception when the time is reached before locking. template <class Clock, class Duration> void lock_until(const chrono::time_point<Clock, Duration>& abs_time); Do you think that lock_until should be more adequate in some contexts? if yes, on which ones? If no, why try_lock_until will always be a better choice?

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  • Creating mock Objects in PHP unit

    - by Mike
    Hi, I've searched but can't quite find what I'm looking for and the manual isn't much help in this respect. I'm fairly new to unit testing, so not sure if I'm on the right track at all. Anyway, onto the question. I have a class: <?php class testClass { public function doSomething($array_of_stuff) { return AnotherClass::returnRandomElement($array_of_stuff); } } ?> Now, clearly I want the AnotherClass::returnRandomElement($array_of_stuff); to return the same thing every time. My question is, in my unit test, how do I mockup this object? I've tried adding the AnotherClass to the top of the test file, but when I want to test AnotherClass I get the "Cannot redeclare class" error. I think I understand factory classes, but I'm not sure how I would apply that in this instance. Would I need to write an entirely seperate AnotherClass class which contained test data and then use the Factory class to load that instead of the real AnotherClass? Or is using the Factory pattern just a red herring. I tried this: $RedirectUtils_stub = $this->getMockForAbstractClass('RedirectUtils'); $o1 = new stdClass(); $o1->id = 2; $o1->test_id = 2; $o1->weight = 60; $o1->data = "http://www.google.com/?ffdfd=fdfdfdfd?route=1"; $RedirectUtils_stub->expects($this->any()) ->method('chooseRandomRoot') ->will($this->returnValue($o1)); $RedirectUtils_stub->expects($this->any()) ->method('decodeQueryString') ->will($this->returnValue(array())); in the setUp() function, but these stubs are ignored and I can't work out whether it's something I'm doing wrong, or the way I'm accessing the AnotherClass methods. Help! This is driving me nuts.

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  • Can this PHP function be improved?

    - by jasondavis
    Below is some code I am working on for a navigation menu, if you are on a certain page, it will add a "current" css class to the proper tab. I am curious if there is a better way to do this in PHP because it really seems like a lot of code to do such a simple task? My pages will also have a jquery library already loaded, would it be better to set the tab with jquery instead of PHP? Any tips appreciated <?PHP active_header('page identifier goes here'); //ie; 'home' or 'users.online' function active_header($page_name) { // arrays for header menu selector $header_home = array('home' => true); $header_users = array( 'users.online' => true, 'users.online.male' => true, 'users.online.female' => true, 'users.online.friends' => true, 'users.location' => true, 'users.featured' => true, 'users.new' => true, 'users.browse' => true, 'users.search' => true, 'users.staff' => true ); $header_forum = array('forum' => true); $header_more = array( 'widgets' => true, 'news' => true, 'promote' => true, 'development' => true, 'bookmarks' => true, 'about' => true ); $header_money = array( 'account.money' => true, 'account.store' => true, 'account.lottery' => true, 'users.top.money' => true ); $header_account = array('account' => true); $header_mail = array( 'mail.inbox' => true, 'mail.sentbox' => true, 'mail.trash' => true, 'bulletins.post' => true, 'bulletins.my' => true, 'bulletins' => true ); // set variables if there array value exist if (isset($header_home[$page_name])){ $current_home = 'current'; }else if (isset($header_users[$page_name])){ $current_users = 'current'; }else if (isset($header_forum[$page_name])){ $current_forum = 'current'; }else if (isset($header_more[$page_name])){ $current_more = 'current'; }else if (isset($header_money[$page_name])){ $current_money = 'current'; }else if (isset($header_account[$page_name])){ $current_account = 'current'; }else if (isset($header_mail[$page_name])){ $current_mail = 'current'; } // show the links echo '<li class="' . (isset($current_home) ? $current_home : '') . '"><a href=""><em>Home</em></a></li>'; echo '<li class="' . (isset($current_users) ? $current_users : '') . '"><a href=""><em>Users</em></a></li>'; echo '<li class="' . (isset($current_forum) ? $current_forum : '') . '"><a href=""><em>Forum</em></a></li>'; echo '<li class="' . (isset($current_more) ? $current_more : '') . '"><a href=""><em>More</em></a></li>'; echo '<li class="' . (isset($current_money) ? $current_money : '') . '"><a href=""><em>Money</em></a></li>'; echo '<li class="' . (isset($current_account) ? $current_account : '') . '"><a href=""><em>Account</em></a></li>'; echo '<li class="' . (isset($current_mail) ? $current_mail : '') . '"><a href=""><em>Mail</em></a></li>'; } ?>

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  • @Resource annotation is null at run-time.

    - by Andrew
    I'm using GlassFish v3. The following field is declared in a class: @Resource private javax.sql.DataSource _data_source; The following is declare in web.xml: <data-source <namejava:app/env/data</name <class-namecom.mysql.jdbc.Driver</class-name <server-namelocalhost</server-name <port-number3306</port-number <usermyUser</user <passwordmyPass</password </data-source At run-time _data_source is empty. What am I doing wrong?

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  • jquery next() outside of div

    - by mike
    Hi, I'm trying to use next() to toggle a div. The problem is that the "trigger" is in a different div than the one I want to toggle. An example that works: $("span.trigger").click(function(){ $(this).next("div.task_description").slideToggle("fast"); }); <span class="trigger">The trigger</span> <div class="task_description "> some content </div> But the way I need the html setup is: <div> <span class="trigger">The trigger</span> </div> <div class="task_description "> some content </div> That doesn't work... any suggestions?

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  • C#: Determine Type for (De-)Serialization

    - by dbemerlin
    Hi, i have a little problem implementing some serialization/deserialization logic. I have several classes that each take a different type of Request object, all implementing a common interface and inheriting from a default implementation: This is how i think it should be: Requests interface IRequest { public String Action {get;set;} } class DefaultRequest : IRequest { public String Action {get;set;} } class LoginRequest : DefaultRequest { public String User {get;set;} public String Pass {get;set;} } Handlers interface IHandler<T> { public Type GetRequestType(); public IResponse HandleRequest(IModel model, T request); } class DefaultHandler<T> : IHandler<T> // Used as fallback if the handler cannot be determined { public Type GetRequestType() { return /* ....... how to get the Type of T? ((new T()).GetType()) ? .......... */ } public IResponse HandleRequest(IModel model, T request) { /* ... */ } } class LoginHandler : DefaultHandler<LoginRequest> { public IResponse HandleRequest(IModel mode, LoginRequest request) { } } Calling class Controller { public ProcessRequest(String action, String serializedRequest) { IHandler handler = GetHandlerForAction(action); IRequest request = serializer.Deserialize<handler.GetRequestType()>(serializedRequest); handler(this.Model, request); } } Is what i think of even possible? My current Solution is that each handler gets the serialized String and is itself responsible for deserialization. This is not a good solution as it contains duplicate code, the beginning of each HandleRequest method looks the same (FooRequest request = Deserialize(serializedRequest); + try/catch and other Error Handling on failed deserialization). Embedding type information into the serialized Data is not possible and not intended. Thanks for any Hints.

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  • Firing PropertyChanged event in a complex, nested type in WPF

    - by John
    Hey I have a question about the PropertyChanged vent firing in WPF whne it is used in a complex type. I have a class called DataStore and a list of Departments (an ObservableCollection), and each department again has a list of Products. Properties in the Product class that are changed also affect properties in the Department and DataStore class. How does each Product notify the Department it belongs to, and the DataStore (which is the mother class of all) that one or more of its properties have changed their values? Example: a product has a property NumberSoldToday and is bound. The Department has a property called TotalNumberOfProductsSold: public int TotalNumberOfProductsSold { get { int result = 0; foreach(Product p in this.products) result += p.NumberSoldToday; return result; } } And the data store has a property TotalProductsSold (for all departments): public int TotalProductsSold { get { int result = 0; foreach(Product p in this.deparments) result += p.TotalNumberOfProductsSold; return result; } } If all these properties are bound, and the innermost property changes, it must somehow notify that the value of the other 2 changed as well. How? The only way I can see this happening is to hook up the PropertyChanged event in each class. Th event must also fire when deleting, adding to the collection of products and deparments, respectively. Is there a better, more clever way to do this?

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  • Polymorphism and c#

    - by saurabh
    Here one more basic question asked in MS interview recently Class A { public virtual void Method1(){} public void Method2() { Method1(); } } class B:A { public override void Method1() { } } Class main { A obk = new B(); obk.Method2(); } now tell me which function gets called ? sorry for the typos.

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  • Java Thread Message Passing

    - by pkulak
    I'm writing an Android app. I have a main method, which creates and runs a new Thread using an anonymous inner Runnable class. The run() method, when it's done, calls a method on it's parent class (in the main thread) that calls notifyDataSetChanged() so that the main thread can redraw the new data. This is causing all kinds of trouble (ViewRoot$CalledFromWrongThreadException). The thing is, this method being called from the worker thread is on the class that's created in the UI thread. Shouldn't that be running on the UI thread? Or am I missing something? Here's some code about what I'm talking about: public class Mealfire extends Activity { @Override public void onCreate(Bundle icicle) { (new Thread() { public void run() { // Do a bunch of slow network stuff. update(); } }).start(); } private void update() { myAdapter.notifyDatasetChanged(); } }

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  • Directly Jump to another C++ function

    - by maligree
    I'm porting a small academic OS from TriCore to ARM Cortex (Thumb-2 instruction set). For the scheduler to work, I sometimes need to JUMP directly to another function without modifying the stack nor the link register. On TriCore (or, rather, on tricore-g++), this wrapper template (for any three-argument-function) works: template< class A1, class A2, class A3 > inline void __attribute__((always_inline)) JUMP3( void (*func)( A1, A2, A3), A1 a1, A2 a2, A3 a3 ) { typedef void (* __attribute__((interrupt_handler)) Jump3)( A1, A2, A3); ( (Jump3)func )( a1, a2, a3 ); } //example for using the template: JUMP3( superDispatch, this, me, next ); This would generate the assembler instruction J (a.k.a. JUMP) instead of CALL, leaving the stack and CSAs unchanged when jumping to the (otherwise normal) C++ function superDispatch(SchedulerImplementation* obj, Task::Id from, Task::Id to). Now I need an equivalent behaviour on ARM Cortex (or, rather, for arm-none-linux-gnueabi-g++), i.e. generate a B (a.k.a. BRANCH) instruction instead of BLX (a.k.a. BRANCH with link and exchange). But there is no interrupt_handler attribute for arm-g++ and I could not find any equivalent attribute. So I tried to resort to asm volatile and writing the asm code directly: template< class A1, class A2, class A3 > inline void __attribute__((always_inline)) JUMP3( void (*func)( A1, A2, A3), A1 a1, A2 a2, A3 a3 ) { asm volatile ( "mov.w r0, %1;" "mov.w r1, %2;" "mov.w r2, %3;" "b %0;" : : "r"(func), "r"(a1), "r"(a2), "r"(a3) : "r0", "r1", "r2" ); } So far, so good, in my theory, at least. Thumb-2 requires function arguments to be passed in the registers, i.e. r0..r2 in this case, so it should work. But then the linker dies with undefined reference to `r6' on the closing bracket of the asm statement ... and I don't know what to make of it. OK, I'm not the expert in C++, and the asm syntax is not very straightforward... so has anybody got a hint for me? A hint to the correct __attribute__ for arm-g++ would be one way, a hint to fix the asm code would be another. Another way maybe would be to tell the compiler that a1..a3 should already be in the registers r0..r2 when the asm statement is entered (I looked into that a bit, but did not find any hint).

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  • Tips on how to refactor this unwieldy upvote/downvote code

    - by bob_cobb
    Basically this code is for an upvote/downvote system and I'm basically Incrementing the count by 1 when voting up Decrementing the count by 1 when voting down If the number of downvotes upvotes, we'll assume it's a negative score, so the count stays 0 Reverting the count back to what it originally was when clicking upvote twice or downvote twice Never go below 0 (by showing negative numbers); Basically it's the same scoring scheme reddit uses, and I tried to get some ideas from the source which was minified and kind of hard to grok: a.fn.vote = function(b, c, e, j) { if (reddit.logged && a(this).hasClass("arrow")) { var k = a(this).hasClass("up") ? 1 : a(this).hasClass("down") ? -1 : 0, v = a(this).all_things_by_id(), p = v.children().not(".child").find(".arrow"), q = k == 1 ? "up" : "upmod"; p.filter("." + q).removeClass(q).addClass(k == 1 ? "upmod" : "up"); q = k == -1 ? "down" : "downmod"; p.filter("." + q).removeClass(q).addClass(k == -1 ? "downmod" : "down"); reddit.logged && (v.each(function() { var b = a(this).find(".entry:first, .midcol:first"); k > 0 ? b.addClass("likes").removeClass("dislikes unvoted") : k < 0 ? b.addClass("dislikes").removeClass("likes unvoted") : b.addClass("unvoted").removeClass("likes dislikes") }), a.defined(j) || (j = v.filter(":first").thing_id(), b += e ? "" : "-" + j, a.request("vote", {id: j,dir: k,vh: b}))); c && c(v, k) } }; I'm trying to look for a pattern, but there are a bunch of edge cases that I've been adding in, and it's still a little off. My code (and fiddle): $(function() { var down = $('.vote-down'); var up = $('.vote-up'); var direction = up.add(down); var largeCount = $('#js-large-count'); var totalUp = $('#js-total-up'); var totalDown = $('#js-total-down'); var totalUpCount = parseInt(totalUp.text(), 10); var totalDownCount = parseInt(totalDown.text(), 10); var castVote = function(submissionId, voteType) { /* var postURL = '/vote'; $.post(postURL, { submissionId : submissionId, voteType : voteType } , function (data){ if (data.response === 'success') { totalDown.text(data.downvotes); totalUp.text(data.upvotes); } }, 'json'); */ alert('voted!'); }; $(direction).on('click', direction, function () { // The submission ID var $that = $(this), submissionId = $that.attr('id'), voteType = $that.attr('dir'), // what direction was voted? [up or down] isDown = $that.hasClass('down'), isUp = $that.hasClass('up'), curVotes = parseInt($that.parent().find('div.count').text(), 10); // current vote castVote(submissionId, voteType); // Voted up on submission if (voteType === 'up') { var alreadyVotedUp = $that.hasClass('likes'), upCount = $that.next('div.count'), dislikes = $that.nextAll('a').first(); // next anchor attr if (alreadyVotedUp) { // Clicked the up arrow and previously voted up $that.toggleClass('likes up'); if (totalUpCount > totalDownCount) { upCount.text(curVotes - 1); largeCount.text(curVotes - 1); } else { upCount.text(0); largeCount.text(0); } upCount.css('color', '#555').hide().fadeIn(); largeCount.hide().fadeIn(); } else if (dislikes.hasClass('dislikes')) { // Voted down now are voting up if (totalDownCount > totalUpCount) { upCount.text(0); largeCount.text(0); } else if (totalUpCount > totalDownCount) { console.log(totalDownCount); console.log(totalUpCount); if (totalDownCount === 0) { upCount.text(curVotes + 1); largeCount.text(curVotes + 1); } else { upCount.text(curVotes + 2); largeCount.text(curVotes + 2); } } else { upCount.text(curVotes + 1); largeCount.text(curVotes + 1); } dislikes.toggleClass('down dislikes'); upCount.css('color', '#296394').hide().fadeIn(200); largeCount.hide().fadeIn(); } else { if (totalDownCount > totalUpCount) { upCount.text(0); largeCount.text(0); } else { // They clicked the up arrow and haven't voted up yet upCount.text(curVotes + 1); largeCount.text(curVotes + 1).hide().fadeIn(200); upCount.css('color', '#296394').hide().fadeIn(200); } } // Change arrow to dark blue if (isUp) { $that.toggleClass('up likes'); } } // Voted down on submission if (voteType === 'down') { var alreadyVotedDown = $that.hasClass('dislikes'), downCount = $that.prev('div.count'); // Get previous anchor attribute var likes = $that.prevAll('a').first(); if (alreadyVotedDown) { if (curVotes === 0) { if (totalDownCount > totalUp) { downCount.text(curVotes); largeCount.text(curVotes); } else { if (totalUpCount < totalDownCount || totalUpCount == totalDownCount) { downCount.text(0); largeCount.text(0); } else { downCount.text((totalUpCount - totalUpCount) + 1); largeCount.text((totalUpCount - totalUpCount) + 1); } } } else { downCount.text(curVotes + 1); largeCount.text(curVotes + 1); } $that.toggleClass('down dislikes'); downCount.css('color', '#555').hide().fadeIn(200); largeCount.hide().fadeIn(); } else if (likes.hasClass('likes')) { // They voted up from 0, and now are voting down if (curVotes <= 1) { downCount.text(0); largeCount.text(0); } else { // They voted up, now they are voting down (from a number > 0) downCount.text(curVotes - 2); largeCount.text(curVotes - 2); } likes.toggleClass('up likes'); downCount.css('color', '#ba2a2a').hide().fadeIn(200); largeCount.hide().fadeIn(200); } else { if (curVotes > 0) { downCount.text(curVotes - 1); largeCount.text(curVotes - 1); } else { downCount.text(curVotes); largeCount.text(curVotes); } downCount.css('color', '#ba2a2a').hide().fadeIn(200); largeCount.hide().fadeIn(200); } // Change the arrow to red if (isDown) { $that.toggleClass('down dislikes'); } } return false; }); });? Pretty convoluted, right? Is there a way to do something similar but in about 1/3 of the code I've written? After attempting to re-write it, I find myself doing the same thing so I just gave up halfway through and decided to ask for some help (fiddle of most recent).

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  • "error: Expected a type, got 'classname'" in C++

    - by Bay
    Using the following code: template <typename T> class node { [. . .] }; class b_graph { friend istream& operator>> (istream& in, b_graph& ingraph); friend ostream& operator<< (ostream& out, b_graph& outgraph); public: [...] private: vector<node> vertices; //This line I'm getting: error: type/value mismatch at argument 1 in template parameter list for ‘template<class _Tp, class _Alloc> class std::vector’ error: expected a type, got 'node' error: template argument 2 is invalid On the indicated line. Node is clearly defined before b_graph which uses it - what have I done here?

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  • Ruby on Rails: create records for multiple models with one form and one submit

    - by notblakeshelton
    I have a 3 models: quote, customer, and item. Each quote has one customer and one item. I would like to create a new quote, a new customer, and a new item in their respective tables when I press the submit button. I have looked at other questions and railscasts and either they don't work for my situation or I don't know how to implement them. I also want my index page to be the page where I can create everything. quote.rb class Quote < ActiveRecord::Base attr_accessible :quote_number has_one :customer has_one :item end customer.rb class Customer < ActiveRecord::Base #unsure of what to put here #a customer can have multiple quotes, so would i use: has_many :quotes #<----? end item.rb class Item < ActiveRecord::Base #also unsure about this #each item can also be in multiple quotes quotes_controller.rb class QuotesController < ApplicationController def index @quote = Quote.new @customer = Customer.new @item = item.new end def create @quote = Quote.new(params[:quote]) @quote.save @customer = Customer.new(params[:customer]) @customer.save @item = Item.new(params[:item]) @item.save end end items_controller.rb class ItemsController < ApplicationController def index end def new @item = Item.new end def create @item = Item.new(params[:item]) @item.save end end customers_controller.rb class CustomersController < ApplicationController def index end def new @customer = Customer.new end def create @customer = Customer.new(params[:customer]) @customer.save end end quotes/index.html.erb <%= form_for @quote do |f| %> <%= f.fields_for @customer do |builder| %> <%= label_tag :firstname %> <%= builder.text_field :firstname %> <%= label_tag :lastname %> <%= builder.text_field :lastname %> <% end %> <%= f.fields_for @item do |builder| %> <%= label_tag :name %> <%= builder.text_field :name %> <%= label_tag :description %> <%= builder.text_field :description %> <% end %> <%= label_tag :quote_number %> <%= f.text_field :quote_number %> <%= f.submit %> <% end %> When I try submitting that I get an error: Can't mass-assign protected attributes: item, customer So to try and fix it I updated the attr_accessible in quote.rb to include :item, :customer but then I get this error: Item(#) expected, got ActiveSupport::HashWithIndifferentAccess(#) Any help would be greatly appreciated.

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  • Creating a library of classes in php - how to handle the library root location?

    - by jax
    I am about to create a collection of classes in php which are interrelated. Now I would like to include files using their absolute path, ie If I were in '/com/mysite/licences/Generator.class.php' I would like to include files like this: include '/com/mysite/lib/Utils.class.php' I don't want to include like this, I think it is confusing and ugly include '../licenses/Utils.class.php' This works ok, unless 'com' is not in the root of public_html. I assume I will need some sort of prefix to append to each file LIBRARY_ROOT that hold the location of 'com' in the current filesystem. So it might look like this include LIBRARY_ROOT.'com/mysite/lib/Utils.class.php' What is the best way to do this?

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  • Why don't web browsers have built in validators?

    - by August Karlstrom
    As far as I know there is no web browser with built in validators for HTML, CSS and JavaScript. Developing web pages without validation is like using a compiler that doesn't do syntax analysis. Even Firefox with its excellent plugins aimed at developers like Firebug lacks plugins for CSS and JavaScript validation. Wouldn't it be useful to have these plugins? Am I missing something?

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  • Scala : reference is ambiguous (imported twice)

    - by tk
    I want to use a method as a parameter of another method of the same class. I have a class and objects which are companions: class mM(var elem:Matrix){ //apply a function on a dimension rows (1) or cols (2) def app(func:Iterable[Double]=>Double)(dim : Int) : Matrix = { ... } //utility function def logsumexp(): Double = {...} } object mM{ def apply(elem:Matrix):mM={new mM(elem)} def logsumexp(elem:Iterable[Double]): Double ={ this.apply(elem.asInstanceOf[Matrix]).logsumexp() } } Normally I use logsumexp like this mM(matrix).logsumexp but if want to apply it to the rows I can't use mM(matrix).app(mM.logsumexp)(1), I get the error: error: reference to mM is ambiguous; it is imported twice in the same scope by import mM and import mM What is the most elegant solution ? Should I change logsumexp() to another class ? Thanks,=)

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  • calling a function from a set of overloads depending on the dynamic type of an object

    - by Jasper
    I feel like the answer to this question is really simple, but I really am having trouble finding it. So here goes: Suppose you have the following classes: class Base; class Child : public Base; class Displayer { public: Displayer(Base* element); Displayer(Child* element); } Additionally, I have a Base* object which might point to either an instance of the class Base or an instance of the class Child. Now I want to create a Displayer based on the element pointed to by object, however, I want to pick the right version of the constructor. As I currently have it, this would accomplish just that (I am being a bit fuzzy with my C++ here, but I think this the clearest way) object->createDisplayer(); virtual void Base::createDisplayer() { new Displayer(this); } virtual void Child::createDisplayer() { new Displayer(this); } This works, however, there is a problem with this: Base and Child are part of the application system, while Displayer is part of the GUI system. I want to build the GUI system independently of the Application system, so that it is easy to replace the GUI. This means that Base and Child should not know about Displayer. However, I do not know how I can achieve this without letting the Application classes know about the GUI. Am I missing something very obvious or am I trying something that is not possible?

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  • How to override [Authorize] attribute in the MVC Web API?

    - by NullReference
    I have a MVC Web Api Controller that uses the [Authorize] attribute at the class level. This makes all of the api methods require authorization but I'd like to create an attribute called [ApiPublic] that overrides the [Authorize] attribute. There is a similar technique described here for normal MVC controllers. I tried creating an AuthorizeAttribute based of the System.Web.Http.AuthorizeAttribute but none of the overridden events are called if I put it on a api method that has the [Authorize] at the class level. Anyone have an idea how to override the authorize for the web api? [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)] public class ApiPublicAttribute : AuthorizeAttribute { protected override void HandleUnauthorizedRequest(System.Web.Http.Controllers.HttpActionContext actionContext) { base.HandleUnauthorizedRequest(actionContext); } public override void OnAuthorization(System.Web.Http.Controllers.HttpActionContext actionContext) { base.OnAuthorization(actionContext); } protected override bool IsAuthorized(System.Web.Http.Controllers.HttpActionContext actionContext) { return true; } }

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  • Vector of objects

    - by Paul
    I've got a abstract class class A { public: virtual void somefunction() = ; }; and some different classes that inherit this class: class Ab { public: void somefunction(); }; etc. I want to make a vector containing some objects of these classes (how many depends on input parameters) so I can access these easily later. However I'm a bit lost on how to do this. My best idea is vector<A> *objectsVector; Ab AbObject; objectsVector.push_back(AbObject); However this gives me a huge amout of errors from various .h files in /usr/include/c++ How should i solve this?

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  • STI and accepts_nested_attributes_for in rails

    - by ryanshackintosh
    I have models as follows: class Entity < ActiveRecord::Base has_many :addresses accepts_nested_attributes_for :addresses, :reject_if => lambda { |a| a[:label].blank?} , :allow_destroy => true end class Client < Entity before_save :set_type private def set_type self.type = "Client" end end class Address < ActiveRecord::Base belongs_to :entity end I have recently implemented accepts_nested_attributes_for on the /clients/new form, as follows: <% form_for(@client, :html => {:class => 'form'}) do |f| -%> <%= f.label :name %> <%= f.text_field :name -%> <%= f.label :phone %> <%= f.text_field :phone %> <% f.fields_for :addresses do |a| %> <%= a.label :street %> <%= a.text_field :street%> <%= a.label :city %> <%= a.text_field :city %> <% end %> <% end %> And my controller as follows: class ClientsController < ApplicationController before_filter :load_client , :except => [:index, :new, :create, :render_clients] def new @client = Client.new @client.addresses.build end def create @client = Client.new(params[:client]) if @client.save flash[:notice] = 'Client has been successfully added' redirect_to @client else render :action => 'new' end end The issue is that when the record is saved it gives an error stating: "Entity can't be blank" I assume it is something to do with the fact that a 'Client' and not an 'Entity' is being added. Can anyone point me in the right direction?

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  • Debug.writeline locks

    - by Carra
    My program frequently stops with a deadlock. When I do a break-all and look at the threads I see that three threads are stuck in our logging function: public class Logging { public static void WriteClientLog(LogLevel logLevel, string message) { #if DEBUG System.Diagnostics.Debug.WriteLine(String.Format("{0} {1}", DateTime.Now.ToString("HH:mm:ss"), message)); //LOCK #endif //...Log4net logging } } If I let the program continue the threads are still stuck on that line. I can't see where this can lock. The debug class, string class & datetime class seem to be thread safe. The error goes away when I remove the "#if DEBUG System... #endif" code but I'm curious why this behavior happens. Thread one: public void CleanCache() { Logging.WriteClientLog(LogLevel.Debug, "Start clean cache.");//Stuck } Thread two: private void AliveThread() { Logging.WriteClientLog(LogLevel.Debug, "Check connection");//Stuck }

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