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• Ruby on Rail - Format for fetching and displaying Dymanic drop down

  - by Ruby

  Hi, I have 3 tables : Student , Subject and Score Every student can add 3 Subjects (Physics, Mathematics and Chemistry) marks. The combination of (student_id + subject_id) is added to Score table. i.e., capturing that sudent '1' has added 'Mathematics' marks with the actual score (say 0-100 range) student id : subjectid Score 1 Mathematics 95 The Add page of Score has a "subject" drop down. which is displayed from "subject" table. When the student wants to add the 2nd subject marks, in the add page, he should not be displayed the previoys added subject in the drop down. Can any1 tell me how to do this?

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• Django forms: prepopulate form with request.user and url parameter

  - by Malyo

  I'm building simple Course Management App. I want Users to sign up for Course. Here's sign up model: class CourseMembers(models.Model): student = models.ForeignKey(Student) course = models.ForeignKey(Course) def __unicode__(self): return unicode(self.student) Student model is extended User model - I'd like to fill the form with request.user. In Course model most important is course_id, which i'm passing into view throught URL parameter (for example http://127.0.0.1:8000/courses/course/1/). What i want to achieve, is to generate 'invisible' (so user can't change the inserted data) form with just input, but containing request.user and course_id parameter.

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• Hibernate many-to-many relationship

  - by Capitan

  I have two mapped types, related many-to-many. @Entity @Table(name = "students") public class Student{ ... @ManyToMany(fetch = FetchType.EAGER) @JoinTable( name = "students2courses", joinColumns = { @JoinColumn( name = "student_id", referencedColumnName = "_id") }, inverseJoinColumns = { @JoinColumn( name = "course_id", referencedColumnName = "_id") }) public Set<Course> getCourses() { return courses; } public void setCourses(Set<Course> courses) { this.courses = courses; } ... } __ @Entity @Table(name = "courses") public class Course{ ... @ManyToMany(fetch = FetchType.EAGER, mappedBy = "courses") public Set<Student> getStudents() { return students; } public void setStudents(Set<Student> students) { this.students = students; } ... } But if I update/delete Course entity, records are not created/deleted in table students2courses. (with Student entity updating/deleting goes as expected) I wrote abstract class HibObject public abstract class HibObject { public String getRemoveMTMQuery() { return null; } } which is inherited by Student and Course. In DAO I added this code (for delete() method): String query = obj.getRemoveMTMQuery(); if (query != null) { session.createSQLQuery(query).executeUpdate(); } and I ovrerided method getRemoveMTMQuery() for Course @Override @Transient public String getRemoveMTMQuery() { return "delete from students2courses where course_id = " + id + ";"; } Now it works but I think it's a bad code. Is there a best way to solve this problem?

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• javascript object creating

  - by Md. Shohel Rana

  I have a javascript object like this var student = function () { this.id = 1; this.Name = "Shohel"; this.Roll = "04115407"; this.Session = "03-04"; this.Subject = "CSE"; }; and i have a javascript array list like this var students = []; now i want to push student into students, this is shown below students.push(new student()) //no prolem students.push(new student[id = 3]) //Problem here second line occurs exceptions, how can i push javascript object like as c# add list, which is representing second line? thanks

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• VB.Net: Class Inheritance make one class another

  - by Kevin

  I have an organization that has clients and students, every student begins as a client. If I have a Client class and a student class that inherits from client. How do I make a client a student?

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• Can reducing index length in Javascript associative array save memory

  - by d777

  I am trying to build a large Associative Array in JavaScript (22,000 elements). Do I need to worry about the length of the indices with regards to memory usage? In other words, which of the following options saves memory? or are they the same in memory consumption? Option 1: var student = new Array(); for (i=0; i<22000; i++) student[i] = { "studentName": token[0], "studentMarks": token[1], "studentDOB": token[2] }; Option 2: var student = new Array(); for (i=0; i<22000; i++) student[i] = { "n": token[0], "m": token[1], "d": token[2] }; I tried to test this on Google Chrome DevTools, but the numbers are inconsistent to make a decision. My best guess is that because the Array indices repeat, the browser can optimize memory usage by not repeating them for each student[i], but that is just a guess. Thanks.

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• Deleting the first occurrence of a target in aList [closed]

  - by Bandz Jooz

  /** Replaces each occurrence of oldItem in aList with newItem */ public static void replace(List<Student> aList, Student oldItemStudent newItem) { int index = aList.indexOf(oldItem); while(index != -1){ aList.set(index, newItem); index = aList.indexOf(oldItem); } /** Deletes the first occurrence of target in aList */ public static void delete(List<Student> aList, Student target){ Object o = //stuck here, dont know how to set up boolean stuff } } I figured out how to do the first method by looking up Java documentation, however I can't figure out how to finish my code for the second method even though I looked up the documentation which states: boolean remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.

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• communication network applications in Ubuntu 12.04

  - by soporte.cs

  I have installed edubuntu on 2 computers that are networked. I installed an educational software to keep track of the teams (one student and one teacher) but the teacher software is not any student team, as I have indicated in the product support should be enabled for proper telnet performance but despite being able to telnet between computers not get it to work. I wonder which options should be active in ubuntu for this type of software to operate smoothly. Thank you.

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• Newbie: get access privilege

  - by Mellon

  I am newbie on Linux Ubuntu machine. I logged in to the Ubuntu with username: student. There are some directories only allowed root user to access, for example /var/lib/mysql ,(I know I can use sudo to access but it is not what I want). If I want to get the access privilege on those directories with student account, is it so that I can run the following command : chown student: PATH_TO_ROOT_USER_PRIVILEGED_DIR and after that, I can access that directory by using my own account ? am I right? If I am right, then will root user lose the access privilege because I changed it to student user? If I am wrong, please tell me the right solution. P.S. please don't concern on what I am going to do on /var/lib/mysql directory, that is only my example, as I mentioned above, I mean generally *for those directories which only have root privilege*, can I use chown to change access privilege and will root user then loose the access because of the change made by chown ? I just wanna know the effect of chown.

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• How does the linux update manager work?

  - by Mr.Student

  I want to know how the update manager for linux works. For instance, how does my linux distro check to see if there are any available updates for download and which servers to download these updates? If I am dealing with 3rd party software not apart of the main distro, how do those programs interact with my update manager to notify me that those programs have available updates? Lastly what would be some good literature on the subject?

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• How many simultaneous requests can be handled by a medium class server on the average?

  - by Motivated Student

  I have bought a PRIMERGY TX100 S1 Server with a trial version of Windows Server 2008 R2 Web Edition. My internet connection with a static IP is very very fast (about 50 mega bit per second) for both downloading and uploading. My site serves text based contents only, no streaming. How many simultaneous requests can be handled by a medium class server on the average? Can it handle at least 1000 simultaneous requests?

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• How to setup and manage a shared hosting server on Windows Server 2008 R2 Web Edition?

  - by Motivated Student

  Background I am a newbie in using Windows Server 2008 R2 Web Edition (and other editions as well). I have a static IP, a very fast internet connection, a server (PRIMERGY TX100 S1 Server) and Windows Server 2008 R2 Web Edition (trial version). The objective is to setup the server to be a shared hosting server such that each of my friends has a private account to manage his/her domain. to upload his/her web content to the server using the encrypted ftp. to manage database administration. to manage Certificate. etc Questions Is there a good reference to learn "how to setup and manage a shared hosting server on Windows Server 2008 R2" ? What are the rough steps I have to do to accomplish my objective?

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• How to make other computers connected to my workgroup able to browse my web server via my private local domain www.mydomain.local?

  - by Motivated Student

  Background I have a broadband connection. The fiber optic cable running from outside to my building is connected to a converter unit. The output of the converter is connected to a router. The router also provides 8 LAN ports to which the computers are connected. Shortly speaking, all computers are interconnected in a workgroup as opposed to a domain. My computer hosts an IIS web server using a private or local domain name www.mydomain.local. I has added 127.0.0.1 www.mydomain.local to the hosts file in the server C:\Windows\System32\drivers\etc so I can browse the site from within the server. So far so good. How to make other computers connected to my workgroup able to browse my web server via my private local domain www.mydomain.local? Note: Again, I am a newbie. I have no idea what I should do next.

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• Install Sybase SQL Anywhere 11 as windows service

  - by student

  we are using Sybase SQL Anywhere 11. I am using command line to install/init database, dbinit -dba %username%,%pwd% -p 4k %dbLocation%, and start database server, dbsrv11 %dbLocation%, in a batch file. What I really want is install my database as Windows service and can be start/running automatically when machine get reboot. But I want to keep using batch for easy intall/uninstall/change it. Any Sybase expert here?

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• What is the minimal steps to setup a client-server network using Windows Server 2008 R2 standard?

  - by Motivated Student

  Background I have One computer server with Win Server 2008 R2 standard installed but it has not been configured. This server has 2 LAN adapters. One adapter is connected to ISP and the other one connected to HUB/Switch. Other computers working as clients are connected to the same HUB/Switch to which the server is connected. IP Printers, IP scanners, IP camera are also connected to the same HUB/Switch. Note: I am a newbie. I only know how to plug RJ-45 sockets and assembly computer peripherals. I have no prior experience in Windows Server at all. Please teach me from the newbie's point of view. Objective I want to establish the following: Each client can access the internet, printers, scanners after it has been successfully authenticated by the server. Unauthenticated clients cannot access the internet, printers, etc. The server hosts a local site. Clients can browse internally using a private domain www.company.com. If the same domain name has been used by other on the internet, my private domain must override the public domain.

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• Driver issue for 7850 HD Diamond Windows 7

  - by Mr.Student

  I have an issue with windows 7 implementing the drivers ati provides for my 7850 HD Diamond video card. The video card is plugged in correctly to the PCIE 2.0 slots of my motherboard (p6t asus) with more then enough power. Fortunately the card works as I have my monitor plugged into the card itself and I can see just fine. However windows 7 does not replace the standard vga default microsoft driver with catalyst drivers that I've tried installing from online as well as the CD. Every time I install the drivers using Catalyst Install manager it always finishes with "Install complete(Warnings occured)". I then see the warnings it has which it instead reports that it successfully installed the SDK, Catalyst Install Manager, and HDMI/AUDIO packages. When I check my device manager after that, the display adapter still shows as standard vga and that its still using microsoft default display adapter. Now this current card is replacing an old card of mine which is the ATI 4890 HD which works beautifully. In fact for the old card to work, all I need to do is go to device manager and right click on standard vga - click update driver and windows 7 magically finds the correct driver to install and everything is good. Not so with the new card. I've even went into my regedits and uninstalled every bit of ati driver software before reinstalling my new card. Nothing's worked thus far. I've already exchanged my card out once and talked to customer support from my motherboard, microsoft, and ati all blaming the other. Please help me out!!

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• choosing the right RAID level

  - by student

  Recently, we bought a "HP-DL380 G6 Server" with 6 146GB (SCSI)HDD for our colleague course management application and website with 10000 daily visitors. we want to choose the best RAID level. how can we choose the right RAID level ? what is the best RAID level for our application ?

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• choosing the right RAID level

  - by student

  Recently, we bought a "HP-DL380 G6 Server" with 6 146GB (SCSI)HDD for our colleague course management application and website with 10000 daily visitors. we want to choose the best RAID level. how can we choose the right RAID level ? what is the best RAID level for our application ?

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• How to shrink the Remote Desktop Connection Bar in Windows?

  - by Some Noob Student

  Ever since FireFox 4, page tabs have been moved to the top of the window. This gets pretty irritating when surfing the net through a remote desktop session. Often when I want to switch tabs, if I accidentally move my mouse a little to much to the top, I get the remote desktop connection bar blocking the tabs instead, then I'd have to wait a few frustrating seconds before it disappears again. So, are there any methods to shrink or shorten the remote desktop connection bar or delay the appearance of it?

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• saving and searching encrypted mail

  - by student

  I often send and receive gpg-encrypted mail. At the moment I use thunderbird + enigmail (in linux) to do that. As far as I know there is no way in thunderbird to find all encrypted messages which bodies contain particular keywords. There also seems to be no option to save encrypted mails decrypted (so they would be searchable). However for me it is important to be able to search old encrypted mails. So my question is: Is there a way in linux to save incoming mails automatically decrypted in my inbox and save outgoing encrypted mail decrypted in the send folder? Both times adding a line to the body which remarks that the mail was encrypted. It could be another email client for linux that could to that or perhaps a solution using procmail or maildrop. For a procmail solution I guess there could be some problems with encoding (perhaps one have to use emil?) the solution should work well with german special characters in subject and body. Note that the solution should work for multipart encrypted messages (including encrypted attachments) too i.e. with everything which could thunderbird + enigmail generate. Further note that I don't want a discussion about security holes. For me it's ok if messages are stored decrypted on my harddrive (which is encrypted as a whole anyway). In doubt for a first solution it would be ok to store my private key passphrase in cleartext on my harddrive, too. The point is that the mails are encrypted on the mailserver or more generally on their "way through the net".

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• What is an edge server / router / device?

  - by Some Student

  What is an edge server? We see some references to them, but we never see a definition.

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• Connect a ssd externally such that hdparm is fully supported

  - by student

  I am just trying some hdparm magic with my new ssd (samsung 840 pro). However I don't want to change my drive over and over so it would be great if I could connect it externally to my laptop. I have a cheap sata-usb Adapter, but I feel it doesn't support the ATA commands send by hdparm. So what's the best way to do this? Are there sata-usb Adapters which fully support the hdparm things? Would it be a good idea to buy a sata-esata adapter to get full control over the drive?

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• Why does my Mac address reset after reconnecting?

  - by Mr.Student

  I have ubuntu 12. I'm changing my mac address with ifconfig wlan0 hw ether xx:xx:xx:xx:xx:xx which works. However when I restart my connection my computer resets my mac to my original mac address. I'm guessing that this happens because something calls... ifconfig wlan0 down ... do something before connecting ifconfig wlan0 up ... connect to designated access point I want my mac address to however be the same no matter how many times I disconnect and reconnect, whether to another network or the same one. Also it would be nice to turn off the auto-connect feature for my network-manager with out having to edit each individual connection. Lastly I would like to know how to connect to a wifi network through the terminal and not via gui network manager ubuntu provides.

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• What does "Don't use the index when searching in file folders for system files" do?

  - by A Student at a University

  I've checked "Don't use the index when searching in file folders for system files", but I don't see a way to tell Windows 7 that I'm looking for a system file. What does this option actually do, and how do I use it to search every file name on the drive for a specified character string? I intend to search file names in an indexed folder that contains non-indexed subfolders and "system" file types, and this option seems to have no effect on the skipping of those subfolders and file types.

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• linux vs windows and web server question

  - by student

  What are the differences from security point of view running a web server on linux and running a web server on windows. I heard that almost nobody going to attack linux machine. Is that true? or Linux is hard to attack and nobody want to waste his time?

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