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  • Business Logic Layer Pattern on Rails? MVCL

    - by Fabiano PS
    That is a broad question, and I appreciate no short/dumb asnwers like: "Oh that is the model job, this quest is retarded (period)" PROBLEM Where I work at people created a system over 2 years for managing the manufacture process over demand in the most simplified still broad as possible, involving selling, buying, assemble, The system is coded over Ruby On Rails. The app has been changed lots of times and the result is a mess on callbacks (some are called several times), 200+ models, and fat controllers: Total bad. The QUESTION is, if there is a gem, or pattern designed to handle Rails large app logic? The logic whould be able to fully talk to models (whose only concern would be data format handling and validation) What I EXPECT is to reduce complexity from various controllers, and hard to track callbacks into files with the responsibility to handle a business operation logic. In some cases there is the need to wait for a response, in others, only validation of the input is enough and a bg process would take place. ie: -- Sell some products (need to wait the operation to finish) 1. Set a View able to get the products input 2. Controller gets the product list inputed by employee and call the logic Logic::ExecuteWithResponse('sell', 'products', :prods => @product_list_with_qtt, :when => @date, :employee => current_user() ) This Logic would handle buying order, assemble order, machine schedule, warehouse reservation, and others. Have in mind that a callback on SalesOrder is not enough, since it depends on where it is called (no field for that), depends on the class of the user, among other stuff not visible for the model, or in some cases it would take long for the model to process.

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  • How to improve problem solving skills/programming skills

    - by kaibuki
    Hi All, I am new to programming, and have been given many interviews for jobs, but what I lag is the concepts and skills of general problem solving not respect to any particular programming language. are there any books or material available which can help me upgrade my programming skills. looking forward for you guys to share your views. Thanks a millions.. Kai

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  • Object.Watch with disabled attribute

    - by Benjamin Fleming
    <html> <head> <script type="text/javascript"> window.onload = function() { var btn = document.getElementById("button"); var tog = document.getElementById("toggle"); tog.onclick = function() { if(btn.disabled) { btn.disabled = false; } else { btn.disabled = true; } }; //btn.watch("disabled", function(prop, val, newval) { }); }; </script> </head> <body> <input type="button" value="Button" id="button" /> <input type="button" value="Toggle" id="toggle" /> </body> </html> If you test this code, the Toggle button will successfully enable and disable the other button. However, un-commenting the btn.watch() line will somehow always set the disabled tag to true. Any ideas?

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  • MonoTouch & C# VS Objective C for iphone app

    - by Eyla
    Greeting, I'm a C# programmer guy. I'm planning to start developing app for iphone but I'm not sure if I should use C# under MonoTouch or just use the native language for iphone OS Objective C. Is there a different to program for iphone app using C# or Objective C? Is there limitation using C# to program app for iphone or it can do as much as Objective C can do to develop iphone app?

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  • What's the meaning of “Monty Python’s Flying Circus” phrase on Python?

    - by Zignd
    I just started studying Python using the Python 3.2 Tutorial and on the introduction is written: By the way, the language is named after the BBC show “Monty Python’s Flying Circus” and has nothing to do with reptiles. Making references to Monty Python skits in documentation is not only allowed, it is encouraged! But I have to say that I did not understood this part: “Monty Python’s Flying Circus”, I'm Brazilian and even Google Translator don't know how to answer it. Can someone explain me this phrase?

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  • Sequence reduction in R

    - by drknexus
    Assume you have a vector like so: v <- c(1,1,1,2,2,2,2,1,1,3,3,3,3) How can it be best reduced to a data.frame like this? v.df <- data.frame(value=c(1,2,1,3),repetitions=c(3,4,2,4)) In a procedural language I might just iterate through a loop and build the data.frame as I go, but with a large dataset in R such an approach is inefficient. Any advice?

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  • How to cancel binding ObjectDataSource ?

    - by nCdy
    CheckPara is my OnDataBinding procedure SqlDataSource1 is ObjectDataSource (it's only confusing name) Language is Nemerle, but if you know C# you can read it easy protected virtual CheckPara(_ : object, _ : System.EventArgs) : void { foreach(x is Parameter in SqlDataSource1.SelectParameters) when(x.DefaultValue=="") //Cancel binding } so how can I cancel binding when there is not fully configurated ObjectDataSource ? Or... how can I run binding only when I done with all parameters ?

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  • Form repeats values

    - by Tunji Gbadamosi
    I have a dynamically generated form to accept guest details and store the results into the a session array. However, when I retrieve the details, I keep finding that the last two guest details are always the same even though different inputs were given. Here's my form for getting the values (guests.php): <?php session_start(); require_once 'FormDB.php'; include 'connect.php'; include 'guests_.php'; ?> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Enter guest details</title> <script language="JavaScript" type="text/javascript" src="validation_functions.js"></script> </head> <body> <?php if($_SESSION['logged_in']){ //print '<script type="text/javascript">'; //print 'alert("You have successfully logged in '. $_SESSION['volunteer']['first_name'].'")'; //print '</script>'; $first_name="first_name"; $surname="surname"; $sex="sex"; $age = "age"; echo $error; //echo '<form name="choose" action="tables.php" method="post" onsubmit="return validate_guests(this);">'; echo '<form name="choose" action="guests.php" method="post" onsubmit="return validate_guests(this);">'; echo '<input type="hidden" name="hidden_value" value="'.$_SESSION['no_guests'].'" />'; if($_SESSION['no_guests'] >= 1){ echo '<table border="1">'; echo '<th>First Name</th>'; echo '<th>Surname</th>'; echo '<th>Day of Birth</th>'; echo '<th>Month of Birth</th>'; echo '<th>Year of Birth</th>'; echo '<th>Sex</th>'; //echo '<div id="volunteer">'; echo '<tr>'; echo '<td>'; echo $_SESSION['volunteer']['first_name']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['surname']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_day']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_month']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_year']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['sex']; echo '</td>'; echo '</tr>'; //echo '</div>'; for($i=0;$i<$_SESSION['no_guests'];$i++){ //$guest = "guest_".$i; //echo '<div class="'.$guest.'">'; echo '<tr>'; echo '<td>'; echo '<input type="text" name="guest['.$i.']['.$first_name.']" id="fn'.$i.'">'; echo '</td>'; echo '<td>'; echo '<input type="text" name="guest['.$i.']['.$surname.']" id="surname'.$i.'">'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_day]" id="dob_day'.$i.'">'; for($j=1;$j<32;$j++){ echo"<option value='$j'>$j</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_month] id="dob_month'.$i.'">'; for($j=0;$j<sizeof($month);$j++){ $value = ($j + 1); echo"<option value='$value'>$month[$j]</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_year] id="dob_year'.$i.'">'; for($j=1900;$j<$year_limit;$j++){ echo"<option value='$j'>$j</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.']['.$sex.']" id="sex'.$i.'">'; echo '<option>Female</option>'; echo '<option>Male</option>'; echo '</select>'; echo '</td>'; echo '</tr>'; //echo '</div>'; } echo '</table>'; } else{ echo '<table border="1">'; echo '<th>First Name</th>'; echo '<th>Surname</th>'; echo '<th>Day of Birth</th>'; echo '<th>Month of Birth</th>'; echo '<th>Year of Birth</th>'; echo '<th>Sex</th>'; echo '<th>Table</th>'; echo '<th>Seat</th>'; echo '<th>Menu</th>'; //echo '<div id="volunteer">'; echo '<tr>'; echo '<td>'; echo $_SESSION['volunteer']['first_name']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['surname']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_day']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_month']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_year']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['sex']; echo '</td>'; echo '</tr>'; //echo '</div>'; } echo '</table>'; echo '<input type="submit" value="Submit">'; echo '</form>'; } else{ print '<script type="text/javascript">'; print 'alert("You have not successfully logged in '. $_SESSION['volunteer']['first_name'].'")'; print '</script>'; } ?> </body> Here's my code for processing the details (guests_.php): <?php $error = ""; if($_POST){ //$guests = array(); $guests = isset($_POST['guest']) ? $_POST['guest'] : null; if($guests){ foreach($guests as &$guest){ $guest['first_name'] = ucwords(strip_tags($guest['first_name'])); $guest['surname'] = ucwords(strip_tags($guest['surname'])); $guest['dob_day'] = ucwords(strip_tags($guest['dob_day'])); $guest['dob_month'] = ucwords(strip_tags($guest['dob_month'])); $guest['dob_year'] = ucwords(strip_tags($guest['dob_year'])); $guest['sex'] = ucwords(strip_tags($guest['sex'])); } } foreach($guests as $guest){ $date = $form->create_date($guest['dob_day'], $guest['dob_month'], $guest['dob_year']); $exist = $form->user_exists($guest['first_name'], $guest['surname'], $date, $guest['sex']); if($exist != ""){ $error .= $exist; } } if($error == ""){ //$_SESSION['existent_guests'] = FALSE; $_SESSION['guests'] = $guests; $form->set_guests($_SESSION['guests']); //$form->set_volunteer($_SESSION['volunteer']); header("location: tables.php"); exit(); } } ?>

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  • many1 no longer works with Parsec 3.x

    - by Zak
    After updating to Parsec 3.1 from 2.x, code using many1, such as word = many1 letter fails with No instance for (Stream s m Char) arising from a use of `letter' I found a mailing list post claiming that adding {-#LANGUAGE NoMonomorphismRestriction #-} to the top of the source file would solve the problem, but it did not.

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  • Breaking a concave polygon into convex ones.

    - by Bart van Heukelom
    I'm using a game physics library (Box2D) which only supports convex polygon shapes. However, I'd like the level builder to be able to just specify concave polygons without having to worry about that. So, how can I automatically break apart a concave polygon into convex ones (or even all triangles). Speed would be cool, but ease of implementation is more important. The breaking apart will only be done on game initialization. (My language is Flash/ActionScript 3, but that shouldn't matter)

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  • indentation preference and personality

    - by dreftymac
    This question is similar in spirit to : http://stackoverflow.com/questions/492178/links-between-personality-types-and-language-technology-preferences But it is based specifically on indentation (spaces vs tabs and the number of spaces). The reason I am asking here instead of searching is because I remember seeing a specific document writing about this. If I remember correctly, it also talked about why Linus prefers eight spaces.

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  • What's the Easiest Way to Learn Programming?

    - by Chris
    If a friend of yours wanted to get into development and didn't have any experience, what would you suggest? What language/resources would you suggest to break into programming? With all of the technologies out right now and buzz words where should one even start explaining this stuff to people?

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  • Why did Dylan loose to Objective-C

    - by Adam Gent
    I have played/worked with many different programming languages and Dylan is still one of my favorites. My question is why did Dylan fail when Objective-C, Ruby and even Scheme have had more success? Was Dylans performance that much worse than Objective-C that Apple went with it or was purely for social/political reasons. Hopefully someone from apple will see this question :) BTW if you have no idea what Dylan is please google Dylan Progrmaming Language.

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  • Migrating from VBA Excel 2003

    - by Diego Castro
    I have a series of big excel files that work like a program, but I hate beeing tied up (stuck in VBA for excel 2003), so... Whats the best way to implement a gui over a excel vba program (office 2003)? (are there any tools for that... I want to move away from the office suite, but still have it in the background) Or what's the easiest alternative for migrating this code to a more open language. Any ideias?

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  • Laravel - public layout not needed in every function

    - by fischer
    I have just recently started working with Laravel. Great framework so far! However I have a question. I am using a layout template like this: public $layout = 'layouts.private'; This is set in my Base_Controller: public function __construct(){ //Styles Asset::add('reset', 'css/reset.css'); Asset::add('main', 'css/main.css'); //Scripts Asset::add('jQuery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js'); //Switch layout template according to the users auth credentials. if (Auth::check()) { $this -> layout = 'layouts.private'; } else { $this -> layout = 'layouts.public'; } parent::__construct(); } However I get an error exception now when I try to access functions in my diffrent controllers, which should not call any view, i.e. when a user is going to login: class Login_Controller extends Base_Controller { public $restful = true; public function post_index() { $user = new User(); $credentials = array('username' => Input::get('email'), 'password' => Input::get('password')); if (Auth::attempt($credentials)) { } else { } } } The error I get, is that I do not set the content of the different variables in my public $layout. But since no view is needed in this function, how do I tell Laravel not to include the layout in this function? The best solution that I my self have come a cross (don't know if this is a bad way?) is to unset($this -> layout); from function post_index()... To sum up my question: how do I tell Laravel not to include public $layout in certain functions, where a view is not needed? Thanks in advance, fischer

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  • Custom Keyboard (iPhone), UIKeyboardDidShowNotification and UITableViewController

    - by Pascal
    On an iPhone App, I've got a custom keyboard which works like the standard keyboard; it appears if a custom textfield becomes first responder and hides if the field resigns first responder. I'm also posting the Generic UIKeyboardWillShowNotification, UIKeyboardDidShowNotification and their hiding counterparts, like follows: NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithCapacity:5]; [userInfo setObject:[NSValue valueWithCGPoint:self.center] forKey:UIKeyboardCenterBeginUserInfoKey]; [userInfo setObject:[NSValue valueWithCGPoint:shownCenter] forKey:UIKeyboardCenterEndUserInfoKey]; [userInfo setObject:[NSValue valueWithCGRect:self.bounds] forKey:UIKeyboardBoundsUserInfoKey]; [userInfo setObject:[NSNumber numberWithInt:UIViewAnimationCurveEaseOut] forKey:UIKeyboardAnimationCurveUserInfoKey]; [userInfo setObject:[NSNumber numberWithDouble:thisAnimDuration] forKey:UIKeyboardAnimationDurationUserInfoKey]; [[NSNotificationCenter defaultCenter] postNotificationName:UIKeyboardWillShowNotification object:nil userInfo:userInfo]; This code is working and I use it in UIViewController subclasses. Now since iPhone OS 3.0, UITableViewController automatically resizes its tableView when the system keyboards show and hide. I'm only now compiling against 3.0 and I thought that the controller should also resize the table if my custom keyboard appears, since I'm posting the same notification. However it doesn't. The table view controller is set as the delegate of the input fields. Does anyone have an idea why this might be the case? Has anyone implemented something similar successfully? I have standard input fields along the custom ones, so if the user changes the fields the standard keyboard hides and the custom one shows. It would be beneficial if the tableView didn't resize to full height and I didn't have to resize it back with a custom method.

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  • Fastest way to calculate a 128-bit integer modulo a 64-bit integer

    - by Paul Baker
    I have a 128-bit unsigned integer A and a 64-bit unsigned integer B. What's the fastest way to calculate A % B - that is the (64-bit) remainder from dividing A by B? I'm looking to do this in either C or assembly language, but I need to target the 32-bit x86 platform. This unfortunately means that I cannot take advantage of compiler support for 128-bit integers, nor of the x64 architecture's ability to perform the required operation in a single instruction.

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  • Looking for a good book on microprocessor internals

    - by David Holm
    I'm looking for a good book on how modern microprocessors are designed and work as I would like to increase my understanding of what makes them tick. Something that covers pipelines, superscalar architectures, caches etc. A book that is suitable for a programmer with several years of experience and has done and understands assembly programming and machine language, so basically not "CPUs for Dummies" or anything such. What books do people who design today's processors read for instance?

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