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  • How do I handle the messages for a simple web-based live chat, on the server side?

    - by Carson Myers
    I'm building a simple live chat into a web application running on Django, but one thing I'm confused about is how I should store the messages between users. The chat will support multiple users, and a chat "session" is composed of users connected to one user that is the "host." The application is a sort of online document collaboration thing, so user X has a document, and users Y and Z would connect to user X to talk about the document, and that would be one chat session. If user Y disconnected for five minutes, and then signed back in and reconnected to user X, he should not get any of the messages shared between users X and Z while he was away. if users X, Y, and Z can have a chat session about user X's document, then users X and Y can connect to a simultaneous, but separate discussion about user Z's document. How should I handle this? Should I keep each message in the database? Each message would have an owner user and a target user (the host), and a separate table would be used to connect users with messages (which messages are visible to what users). Or should I store each session as an HTML file on the server, which messages get appended to? The problem is, I can't just send messages directly between clients. They have to be sent to the server in a POST request, and then each client has to periodically check for the messages in a GET request. Except I can't just have each message cleared after a client fetches it, because there could be multiple clients. How should I set this up? Any suggestions?

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  • Design an Application That Stores and Processes Files

    - by phasetwenty
    I'm tasked with writing an application that acts as a central storage point for files (usually document formats) as provided by other applications. It also needs to take commands like "file 395 needs a copy in X format", at which point some work is offloaded to a 3rd party application. I'm having trouble coming up with a strategy for this. I'd like to keep the design as simple as possible, so I'd like to avoid big extra frameworks or techniques like threads for as long as it makes sense. The clients are expected to be web applications (for example, one is a django application that receives files from our customers; the others are not yet implemented). The platform it will be running on is likely going to be Python on Linux, unless I have a strong argument to use something else. In the beginning I thought I could fit the information I wanted to communicate in the filenames, and let my application parse the filename to figure out what it needed to do, but this is proving too inflexible with the amount of information I'm realizing I need to make available. Another idea is to pair FTP with a database used as a communication medium (client uploads a file and updates the database with a command as a row in a table) but I don't like this idea because adding commands (a known change) looks like it will require adding code as well as changing database schemas. It will also muddy up the interface my clients will have to use. I looked into Pyro to let applications communicate more directly but I don't like the idea of running an extra nameserver for this one purpose. I also don't see a good way to do file transfer within this framework. What I'm looking for is techniques and/or technologies applicable to my problem. At the simplest level, I need the ability to accept files and messages with them.

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  • How can several different datatypes be saved in one table

    - by poseidon
    This is my situation: I am constructing an ad-like application in Django and Mysql. I am using a flexible-ad approach where we have: a table with ad categories (several categories such as home, furniture, cars, etc.) id_category name a table with details for the ad categories (home: area, squared meters. car: seats, color.) id_detail id_category (the categ the detail describes) name type (boolean, char, int, long, etc.) the ad table (i am selling a house. i am selling a car.) id_ad id_category text date a table where i plan to consolidate the details of the ads (home: A-area, 500 sq-meters. car: 5 seats, red.) id_detail_ad id_ad id_detail value Is this possible? Can I have a table of details for all the ads, even if details include numbers, texts, booleans, etc? Or would I have to save them all as text and then interpret them via code accordingly? Please express your opinions. Thank you.

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  • Processing forms that generate many rows in DB

    - by Zack
    I'm wondering what the best approach to take here is. I've got a form that people use to register for a class and a lot of times the manager of a company will register multiple people for the class at the same time. Presently, they'd have to go through the registration process multiple times and resubmit the form once for every person they want to register. What I want to do is give the user a form that has a single <input/> for one person to register with, along with all the other fields they'll need to fill out (Email, phone number, etc); if they want to add more people, they'll be able to press a button and a new <input/> will be generated. This part I know how to do, but I'm including it to best describe what I'm aiming to do. The part I don't know how to approach is processing that data the form submits, I need some way of making a new row in the Registrant table for every <input/> that's added and include the same contact information (phone, email, etc) as the first row with that row. For the record, I'm using the Django framework for my back-end code. What's the best approach here? Should it just POST the form x times for x people, or is there a less "brute force" way of handling this?

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  • Declaring models elsewhere than in "models.py" AND dynamically

    - by sebpiq
    Hi ! I have an application that splits models into different files. Actually the folder looks like : >myapp __init__.py models.py >hooks ... ... myapp don't care about what's in the hooks, folder, except that there are models, and that they have to be declared somehow. So, I put this in myapp.__init__.py : from django.conf import settings for hook in settings.HOOKS : try : __import__(hook) except ImportError as e : print "Got import err !", e #where settings.HOOKS = ("myapp.hooks.a_super_hook1", ...) The problem is that it doesn't work when I run syncdb(and throws some strange "Got import err !"... strange considering that it's related to another module of my program that I don't even import anywhere :/ ) ! So I tried successively : 1) for hook in settings.HOOKS : try : exec ("from %s import *" % hook) - doesn't work either : syncdb doesn't install the models in hooks 2) from myapp.hooks.a_super_hook1 import * - This works 3) exec("from myapp.hooks.a_super_hook1 import *") - This works to So I checked that in the test 1), the statement executed is the same than in tests 2) and 3), and it is exactly the same ... Any idea ???

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  • Guidance on E-commerce in a Python Framework

    - by Ant
    I am looking for guidance in making decisions on using Python for E-commerce. My reasoning to use Python in the first place is i do a lot of 3D so it's a real help to use Python for web server side as well as 3D so I do not need to learn a new language. When I say E-commerce i mean the logic behind displaying products and a check out system that is Robust....and yes I really want to build this myself so I can change it. I do not want to use an out the box solution that costs a lot of money every month. I want control of server side, data bases, e-commerce etc. My questions are: What Frameworks are out there? I looked at previous questions on stackoverflow but only found old posts about Sachmo and Get paid. What is the learning path, I do not want to make a mistake that costs six months of studying? Python then Django? How long if I spent 10 hours a day studying this would it take to get up and running? I write javaScript badly, so I am not a complete noob, I understand the basics of programming languages. many thanks in advance

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  • The data reader returned by the store data provider does not have enough columns

    - by molgan
    Hello I get the following error when I try to execute a stored procedure: "The data reader returned by the store data provider does not have enough columns" When I in the sql-manager execute it like this: DECLARE @return_value int, @EndDate datetime EXEC @return_value = [dbo].[GetSomeDate] @SomeID = 91, @EndDate = @EndDate OUTPUT SELECT @EndDate as N'@EndDate' SELECT 'Return Value' = @return_value GO It returns the value properly.... @SomeDate = '2010-03-24 09:00' And in my app I have: if (_entities.Connection.State == System.Data.ConnectionState.Closed) _entities.Connection.Open(); using (EntityCommand c = new EntityCommand("MyAppEntities.GetSomeDate", (EntityConnection)this._entities.Connection)) { c.CommandType = System.Data.CommandType.StoredProcedure; EntityParameter paramSomeID = new EntityParameter("SomeID", System.Data.DbType.Int32); paramSomeID.Direction = System.Data.ParameterDirection.Input; paramSomeID.Value = someID; c.Parameters.Add(paramSomeID); EntityParameter paramSomeDate = new EntityParameter("SomeDate", System.Data.DbType.DateTime); SomeDate.Direction = System.Data.ParameterDirection.Output; c.Parameters.Add(paramSomeDate); int retval = c.ExecuteNonQuery(); return (DateTime?)c.Parameters["SomeDate"].Value; Why does it complain about columns? I googled on error and someone said something about removing RETURN in sp, but I dont have any RETURN there. last like is like SELECT @SomeDate = D.SomeDate FROM .... /M

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  • Custom HTML attributes on SelectListItems in MVC2?

    - by blesh
    I have a need to add custom HTML attributes, specifically classes or styles to option tags in the selects generated by Html.DropDownFor(). I've been playing with it, and for the life of me I can't figure out what I need to do to get what I need working. Assuming I have a list of colors that I'm generating the dropdown for, where the option value is the color's identifier, and the text is the name... here's what I'd like to be able to see as output: <select name="Color"> <option value="1" style="background:#ff0000">Red</option> <option value="2" style="background:#00ff00">Green</option> <option value="3" style="background:#0000ff">Blue</option> <!-- more here --> <option value="25" style="background:#f00f00">Foo Foo</option> </select

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  • ASP.NET MVC 2 loading partial view using jQuery - no client side validation

    - by brainnovative
    I am using jQuery.load() to render a partial view. This part looks like this: $('#sizeAddHolder').load( '/MyController/MyAction', function () { ... }); The code for actions in my controller is the following: public ActionResult MyAction(byte id) { var model = new MyModel { ObjectProp1 = "Some text" }; return View(model); } [HttpPost] public ActionResult MyAction(byte id, FormCollection form) { // TODO: DB insert logic goes here var result = ...; return Json(result); } I am returning a partial view that looks something like this: <% using (Html.BeginForm("MyAction", "MyController")) {%> <%= Html.ValidationSummary(true) %> <h3>Create my object</h3> <fieldset> <legend>Fields</legend> <div class="editor-label"> <%= Html.LabelFor(model => model.ObjectProp1) %> </div> <div class="editor-field"> <%= Html.TextBoxFor(model => model.Size.ObjectProp1) %> <%= Html.ValidationMessageFor(model => model.ObjectProp1) %> </div> div class="editor-label"> <%= Html.LabelFor(model => model.ObjectProp2) %> </div> <div class="editor-field"> <%= Html.TextBoxFor(model => model.ObjectProp2) %> <%= Html.ValidationMessageFor(model => model.ObjectProp2) %> </div> <p> <input type="submit" value="Create" /> </p> </fieldset> <% } %> Client side validation does not work in this case. What is more the script that contains validation messages also isn't included in the view that's returned. Both properties in my model class have Required and StringLength attributes. Is there any way to trigger client side validation in a view which has been loaded like this?

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  • Three.js Collada import animation not working

    - by Peter Vasilev
    I've been trying to export a Collada animated model to three js. Here is the model: http://bayesianconspiracy.com/files/model.dae It is imported properly(I can see the model) but I can't get it to animate. I've been using the two Collada examples that come with Three js. I've tried just replacing the path with the path to my model but it doesn't work. I've also tried tweaking some stuff but to no avail. When the model is loaded I've checked the 'object.animations' object which seems to be loaded fine(can't tell for sure but there is lots of stuff in it). I've also tried the Three.js editor: http://threejs.org/editor/ which loads the model properly again but I can't play the animation : ( I am using Three JS r62 and Blender 2.68. Any help appreciated!!

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  • Need Sharepoint like modal pop-up window

    - by Srikanth
    I need to show Sharepoint 2010 like pop-up window when clicked on a link in grid view. Once the modal pop-up displayed and user selected the Save button data base should be updated with given values in pop-up. How can I get this. Any Idea. As of now I am using below code to get it but no idea how to pass the values to Database once clicked on the button in pop-up Note: As of now I am not adding the gridview code here as I wanted to achieve it first with sample html then wanted to do with grid view. Java Script function openDialog() { var options = { html: divModalDialogContent, // ID of the HTML tag // or HTML content to be displayed in modal dialog width: 600, height: 300, title: "My First Modal Dialog", dialogReturnValueCallback: dialogCallbackMethod, // custom callback function allowMaximize: true, showClose: true }; SP.UI.ModalDialog.showModalDialog(options); } //Results displayed if 'OK' or 'Cancel' button is clicked if the html content has 'OK' and 'Cancel' buttons function onDialogClose(dialogResult, returnValue) { if (dialogResult == SP.UI.DialogResult.OK) { alert('Ok!'); } if (dialogResult == SP.UI.DialogResult.cancel) { alert('Cancel'); } } // Custom callback function after the dialog is closed function dialogCallbackMethod() { alert('Callback method of modal dialog!'); } HTML <div id="divModalDialogContent"> Hello World! <input type="button" value="OK"onclick="SP.UI.ModalDialog.commonModalDialogClose(SP.UI.DialogResult.OK, 'Ok clicked'); return false;" class="ms-ButtonHeightWidth" /> <input type="button" value="Cancel"onclick="SP.UI.ModalDialog.commonModalDialogClose(SP.UI.DialogResult.cancel, 'Cancel clicked'); return false;" class="ms-ButtonHeightWidth" /> <asp:Button runat="server" ID="btnClicked" Text="Clicked" onclick="btnClicked_Click" /> <input type="button" value="Open" onclick="openDialog()" /> How can I call db upon clicking 'clicked' button in pop-up. Also I need to send parameters to pop-up Thanks in advance

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  • iphone Rendering 3-D Object rendering

    - by Yoon Lee
    Hello, I'm a beginner 3-D Quartz thing but knows how to create application. I was looking over sample of GLGravity Source code given by apple today, I was wondering teapot.h file contains all contents of array file such as indices, vertices. Do you guys think this code has been provided by human or, program? if it so, any auto generate program exist written in c based? (cause teapot.h seemed to me obvious native c code) thanks.

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  • ASP.NET MVC 2 validation LINQ to SQL

    - by Chino
    Currently I have a DataModel object which contains my linq to sql classes(a dmbl file). Currently I use a partial class to validate the incoming input. For example public partial class User : IEntity { public NameValueCollection CheckModel() { return GetRuleViolations(); } /// <summary> /// Method validates incoming data, by given rules in the if statement. /// </summary> /// <returns>NameValueCollection</returns> private NameValueCollection GetRuleViolations() { NameValueCollection errors = new NameValueCollection(); if (string.IsNullOrEmpty(Username)) errors.Add("Username", "A username is required"); // and so on return errors; } } Now what I want to try to do is add validation attributes to the fields. For example I want to try to add the required attribute to the field Username instead/in addtion of using the validation I currently have. My question is how can I achieve this because the dmbl file is auto generated. Or maybe it is not possible and should I use a different approach?

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  • Rails ActiveRecord: Select Posts WITHOUT comments

    - by Nathan
    I have a a Comments table and a Posts table, where a Post has many comments and a comment belongs to a post (i.e. it has a post_id in the table). How can I efficiently select the last ten Posts that DO NOT have comments. I can't seem to accomplish this without first selecting all the posts and checking each for a 0 comment count. Thanks in advance for any help. -Nathan

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  • Is MVC a Design Pattern or Architectural pattern

    - by JCasso
    According to Sun and Msdn it is a design pattern. According to Wikipedia it is an architectural pattern In comparison to design patterns, architectural patterns are larger in scale. (Wikipedia - Architectural pattern) Or it is an architectural pattern that also has a design pattern ? Which one is true ?

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  • Parametrized Strategy Pattern

    - by ott
    I have several Java classes which implement the strategy pattern. Each class has variable number parameters of different types: interface Strategy { public data execute(data); } class StrategyA implements Strategy { public data execute(data); } class StrategyB implements Strategy { public StrategyB(int paramA, int paramB); public data execute(data); } class StrategyB implements Strategy { public StrategyB(int paramA, String paramB, double paramC); public data execute(data); } Now I want that the user can enter the parameters in some kind of UI. The UI should be chosen at runtime, i.e. the strategies should be independent of it. The parameter dialog should not be monolithic and there should be the possibility to make it behave and look different for each strategy and UI (e.g. console or Swing). How would you solve this problem?

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  • Map a column to be IDENTITY in db with EF4 Code-Only

    - by Tomas Lycken
    Although I have marked my ID column with .Identity(), the generated database schema doesn't have IDENTITY set to true, which gives me problems when I'm adding records. If I manually edit the database schema (in SQL Management Studio) to have the Id column marked IDENTITY, everything works as I want it - I just can't make EF do that by itself. This is my complete mapping: public class EntryConfiguration : EntityConfiguration<Entry> { public EntryConfiguration() { Property(e => e.Id).IsIdentity(); Property(e => e.Amount); Property(e => e.Description).IsRequired(); Property(e => e.TransactionDate); Relationship(e => (ICollection<Tag>)e.Tags).FromProperty(t => t.Entries); } } As I'm using EF to build and re-build the database for integration testing, I really need this to be done automatically...

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  • How to handle One View with multiple ViewModel and fire different Commands

    - by Naresh
    Hi All, I have senario in which one view and view has binding with multiple ViewModel. Eg. One View displaying Phone Detail and ViewModel as per bellow: Phone basic features- PhoneViewModel, Phone Price Detail- PhoneSubscriptionViewModel, Phone Accessories- PhoneAccessoryViewModel For general properties- PhoneDetailViewModel I have placed View's general properties to PhoneViewModel.Now senario is like this: By default View displays Phone Basic feaures which is bind with ObservationCollection of PhoneViewModel. My view have button - 'View Accessories', onclick of this button one popup screen- in my design I have display/hide Grid and bind it with ObservationCollection of PhoneAccessoryViewModel. Now problem begins- Accessory List also have button 'View Detail' onclick I have to open one popup screen, here also I had placed one Grid and Visible/Hide it. I have bind 'ViewAccessoryDetailCommand' command to 'View Detail' button. And on command execution one function fires and set property which Visible the Popup screen. Using such programming command fires, function calls but the property change not raises and so my view does not display popup. Summary: One View-- ViewModel1--Grid Bind view ViewModel2 --Grid Have Button and Onclick display new Grid which binded with ViewModel3-this Command fires but property not raises. I think there is some problem in my methodology, Please, give your suggetions.

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  • Java LockSupport Memory Consistency

    - by Lachlan
    Java 6 API question. Does calling LockSupport.unpark(thread) have a happens-before relationship to the return from LockSupport.park in the just-unparked thread? I strongly suspect the answer is yes, but the Javadoc doesn't seem to mention it explicitly.

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  • Outlook 2003 Addons

    - by Mohit Nanda
    I want to create a custom Addon/plugin for Outlook 2003, to support integrated functionality with a task management system. I am unable to find many good development resources for the same. Can someone please explain Outlook 2003 architecure and development of a plugin. Good links/resources are also welcome.

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  • CakePHP counterCache

    - by Daniel
    I'm using counterCache to track the number of chapters that have been posted to their related stories. This all works fine, apart from the fact that when the chapter_count field in the database gets updated, the modified field for that record does not. Is there any way that I can set Cake to automatically update the modified field when the counterCache functionality runs? Thank you.

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  • ASP.NET MVC 2 actionlink breaking after migration from MVC version 1

    - by thermal7
    Hi, I am migrating my application from asp.net mvc to mvc version 2 and am having the following issue. I have paging links << < that I include in each page. Like so: <% Html.RenderPartial("PagingControl", Model); %> They exist in an ascx file as follows. <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<BankingDB.Controllers.Utility.IPagedSortedObject>" %> <div class="paging"> <div class="previous-paging"> <!- error!! -><%= Model.HasPreviousPage ? Html.ActionLink("<<", "Index", Model.buildParams(1)) : "<<"%> <%= Model.HasPreviousPage ? Html.ActionLink("<", "Index", Model.buildParams(Model.PreviousPageIndex)) : "<"%> </div> <div class="paging-details"> Showing records <%= Model.BaseRecordIndex %> to <%= Model.MaxRecordIndex %> of <%= Model.TotalRecordCount %> </div> <div class="next-paging"> <%= Model.HasNextPage ? Html.ActionLink(">", "Index", Model.buildParams(Model.NextPageIndex)) : ">"%> <%= Model.HasNextPage ? Html.ActionLink(">>", "Index", Model.buildParams(Model.PageCount)) : ">>"%> </div> </div> When I try to access the page I get the error: CS0173: Type of conditional expression cannot be determined because there is no implicit conversion between 'System.Web.Mvc.MvcHtmlString' and 'string' The error is marked above and appears to be with the action link. Including the controller name doesn't help. Any ideas?

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