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  • Model Validation for record creation in rails

    - by Elliot
    Hey Guys, Lets say the model for books is: created_at user_id (int) author_id (int) genre_id (int) pages (int) I want to let people change the "created_at" field upon record creation. I also want to make sure that a record can't have the exact same created_at, user_id, and author_id as any other record (i.e. each needs its own date). Whats the best to perform this type of validation, and how should I go about doing it? Best, Elliot

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  • Model associations

    - by Kalyan M
    I have two models Library and Book. In my Library model, I have an array - book_ids. The primary key of Book model is ID. How do I create a has_many :books relation in my library model? This is a legacy database we are using with rails. Thanks.

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  • Should a Stack have a maximum size?

    - by Sotirios Delimanolis
    I'm practicing my knowledge of ADTs by implementing some data structures, even if most already exist. With Stacks, a lot of books and other documentation I've read talk about the stack throwing an error when you try to add an element but the stack is full. In a java implementation (or any other), should I specifically keep track of a maximum stack size (from constructor), check to see if that size is reached, and throw an overflow exception if it is? Or is not such a big deal?

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  • Style guide for database metadata naming

    - by Nulldevice
    We want to establish some database metadata naming rules in our new project. For example: tables are named as nouns in a plural form (courses, books, lessons) if present, an adjective goes before a noun in a table name and is separated by an underscore (red_books, new_lessons) table index column is always named "id" foreign key names are derived from a table name with suffix _id (book_id, red_book_id) so on Does someone know any guide like this?

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  • Rails - How do I write this string condition as an array condition

    - by adam
    named_scope :correct, :include => :correction, :conditions => "checked_at IS NOT NULL AND corrections.id IS NULL" On a side note I have googled loads and looked through books but i cant seem to find a list of all the various types of conditions you can use and how they differ when implenting them as strings, arrays or hashes. Is there a list of the syntax anywhere?

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  • Is Programming Right for me?

    - by L1th1um
    I'm interested in programming, but it seems to me that I can't get into it. Every time I've tried to learn a language and stuff by looking through tutorials or books I'd never get past the part where I use the syntax to make something. And by interest, I mean that I read stack overflow a lot, coding horror, and stuff but the actual coding part is hard for me to get into. Did anybody start this way? How did you get past this block?

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  • About x86 architecture assembly and others

    - by caramel1991
    I have the wisdom to learn assembly language,so I search through the internet for the information about this language,and came across some page telling that assembly is a low level native language and varied from one to another processor,so I just wonder,I'm currently running an intel based processor,I've no idea whether it is x86 or what,but I just wanna know,Does it possible for me to learn other processor arhchitecture assembly on my pc??Besides,is there any good books that could guide me through learning the intel architecture assembly.

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  • About x86 architecture assembly and others

    - by caramel1991
    I have the wisdom to learn assembly language,so I search through the internet for the information about this language,and came across some page telling that assembly is a low level native language and varied from one to another processor,so I just wonder,I'm currently running an intel based processor,I've no idea whether it is x86 or what,but I just wanna know,Does it possible for me to learn other processor arhchitecture assembly on my pc??Besides,is there any good books that could guide me through learning the intel architecture assembly.

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  • Is it possible to pass the value in php file using Ajax.Request?

    - by user309381
    function reload(form) { var val = $('seltab').getValue(); new Ajax.Request('Website.php?$cat = val', { method:'post', onSuccess: function(transport){ ..... code in php: echo "<select id = seltab onchange='reload(this.form)'>"; $querysel = "SELECT title_id,author FROM authors NATURAL JOIN books"; $result1 = mysql_query($querysel) ; while($rowID = mysql_fetch_assoc($result1)) {

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  • Classic assembly language texts not using x86?

    - by wrp
    I'm looking for texts that give detailed treatment of assembly programming principles and don't use x86 as the target architecture. I haven't found any recent books like that, but I would expect that there were some good ones written in the 1970s and 1980s, when whole applications were still written in assembly. The architecture used should also be one of the cleaner designs, such as the 6502 or VAX.

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  • XSL-FO: is XSL-FO dead technology and only used by niche companies?

    - by MMAmail.com
    I wanted to convert some xml to a magazine like pdf document. A lot like what Latext allows you to do however i was not able to find any new books or online tutorials on the subject. Is it worth investing in using this technology or not? Also, I looked at the Apache XSL-FO project and their last release was in august 2008. p.s. commercial packages are not an option :(

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  • Learning to write a compiler

    - by Anton
    Preferred Languages : C/C++, Java, and Ruby I am looking for some helpful books/tutorials on how to write your own compiler simply for educational purposes. I am most familiar with C/C++, Java, and Ruby so I prefer resources that involve one of those three, but any good resource is acceptable.

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  • OO implementation of RFC 2445

    - by Dave Jarvis
    Question What PHP library would you recommend for attaching meeting notices to email? Preference given to: Swift Mailer integration Simple Object-Oriented library Application Scheduling of appointments for medical clinics. After the user books an appointment, it would be great to send the meeting notice to their email address (upon request, of course). Thank you!

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  • Clientside going serverside with node.js

    - by Sveisvei
    Hello, I`ve been looking for a serverside language for some time, and python got my attention somewhat. But as I already know and love javascript, I now want learn to code on the server with js and node.js. Now, what books and what subjects do I need to learn to understand the serverside world better? (let me know if Im to vague)

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