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• Rails Updating Nested Model Collection Select

  - by Timothy

  I have a contrived nested Rails form like the following <% form_for @a do |fa| %> <% fa.fields_for :b do |fb| %> <% fb.fields_for :c do |fc| %> <%= fc.label :option_id %> <%= fc.collection_select :option_id, ModelD.all(:select => "id, name"), :id, :name %> <% end %> <% end %> <% end %> and then somewhere else on the same page I have a remote form <% remote_form_for :modeld, ModelD.new, :url => new_modeld_path, :html => {:method => 'post'} do |f| %> <%= f.label :name %> <%= f.textarea :name %> <%= f.submit "Create" %> <% end %> Is there any way I could update all the collection selects in the first form using Ajax when I submit the second form? There are an arbitrary number of collection selects.

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• Version Control software (client server model)

  - by Amira Elsayed

  Hi All, I'm using windows 7 , and all what i want is to install Version Control server on one machine and let other developers to connect to it using the machine IP address and chekout, update and commit files I have tried VisualSVN and it works well for me , I also have tried to install Apache Server and try to configure it to run with subversion but I failed to do so , so if any one can help me I will appreciated Thanks in Advance Edit what I want if any one can suggest an alternative like VisualSVN that let me compare and choose from different options Thanks in Advance

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• accessing Ruby variable(from model or controller) in SASS

  - by corroded

  Is there a way to access ruby variables in sass or do i have to make a custom function for it? What im trying to do is to generate a stylesheet for each user so in the controller, i do something like: def show respond_to do |format| format.css{render :partial => "styles"} end end then in the view name _styles.haml i do this: :sass #header :background url(user.banner.url) is this possible at all?

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• MongoMapper: how do I create a model like this

  - by Vladimir R

  Suppose we have two models, Task and User. So a user can have many tasks and tasks should be able to have many users too. But, a task should also have a unique creator who is also a user. Exemple: A task in this context is like this: Task ID, Task Creator, Users who should do the task User_1 creates a task and he is then the creator. User_1 specifies User_2 and User_3 as users who should do the task. So these two last users are not creators of task. How do I create this models so that if I have a task object, I can find it's creator and users who should complete it. And how do I do, if I have a user, to find all tasks he created and all tasks he should complete. Thank you.

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• Why is Model.scoped generating invalid SQL?

  - by Nicholas H.

  When I run Book.scoped({:conditions => ['books.index LIKE ?','%query%']}) I get: ActiveRecord::StatementInvalid: SQLite3::SQLException: near "index": syntax error: SELECT * FROM "books" WHERE (books.index like '%query%') What am I doing wrong?

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• how to work with datagridview if need show many columns data (approx 1Mio)

  - by ruprog

  is a problem to display data in Datagridview. A large amount of data (stock quotes) data to be displayed from left to right Tell me what to do to display an array of data in datagridviev Public dat As New List(Of act) Public Class act Public time As Date Public price As Integer End Class Sub work() Dim r As New Random For x As Integer = 0 To 1000000 Dim el As New act el.time = Now el.price = r.Next(0, 1000) dat.Add(New act) Next End Sub

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• Circular database relationships. Good, Bad, Exceptions?

  - by jim

  I have been putting off developing this part of my app for sometime purely because I want to do this in a circular way but get the feeling its a bad idea from what I remember my lecturers telling me back in school. I have a design for an order system, ignoring the everything that doesn't pertain to this example I'm left with: CreditCard Customer Order I want it so that, Customers can have credit cards (0-n) Customers have orders (1-n) Orders have one customer(1-1) Orders have one credit card(1-1) Credit cards can have one customer(1-1) (unique ids so we can ignore uniqueness of cc number, husband/wife may share cc instances ect) Basically the last part is where the issue shows up, sometimes credit cards are declined and they wish to use a different one, this needs to update which their 'current' card is but this can only change the current card used for that order, not the other orders the customer may have on disk. Effectively this creates a circular design between the three tables. Possible solutions: Either Create the circular design, give references: cc ref to order, customer ref to cc customer ref to order or customer ref to cc customer ref to order create new table that references all three table ids and put unique on the order so that only one cc may be current to that order at any time Essentially both model the same design but translate differently, I am liking the latter option best at this point in time because it seems less circular and more central. (If that even makes sense) My questions are, What if any are the pros and cons of each? What is the pitfalls of circular relationships/dependancies? Is this a valid exception to the rule? Is there any reason I should pick the former over the latter? Thanks and let me know if there is anything you need clarified/explained. --Update/Edit-- I have noticed an error in the requirements I stated. Basically dropped the ball when trying to simplify things for SO. There is another table there for Payments which adds another layer. The catch, Orders can have multiple payments, with the possibility of using different credit cards. (if you really want to know even other forms of payment). Stating this here because I think the underlying issue is still the same and this only really adds another layer of complexity.

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• Hyper-V Ubuntu Networking Problems Copying Large Amounts of Data

  - by Anonymous

  I am trying to copy a large amount (about 50 GB) of data over my network from a Hyper-V-hosted virtual machine running Ubuntu 11.04 (Natty Narwhal) to another (non-virtual) Ubuntu host that I plan to use for testing upgrades to one of our web applications. The problem I am having is with the virtual machine, which I shall refer to in what follows as "source.host". This machine is running 64-bit Ubuntu Server with the 2.6.38-8-server kernel and the Microsoft Linux Integration Components for Hyper-V kernel modules (hv_utils, hv_timesource, hv_netvsc, hv_blkvsc, hv_storvsc, and hv_vmbus) loaded. It uses a Hyper-V "synthetic network adapter" for its networking interface. To do the copy, I log on to the machine with the data and run the following commands (Call the remote machine "destination.host".): $ cd /path/to/data $ tar -cvf - datafolder/ | ssh [email protected] "cat > ~/data.tar" This runs for a while and then suddenly stops after transferring somewhere from 2-6 GB. The terminal on the source.host machine displays a Write failed: broken pipe error. The odd part is this: after this occurs, the "source.host" machine is no longer able to talk to the rest of the network. I cannot ping any other hosts on the network from the "source.host" machine, and I cannot ping the "source.host" machine from any other host on the network. I am equally unable to access the any of the web services hosted on "source.host". Running ifconfig on "source.host" shows the network adapter to be up and running as usual with the correct IP address and everything. I tried restarting the networking service with $ /etc/init.d/networking restart but the problem does not go away. Restarting the machine makes it capable of talking to the network again -- it can ping and be pinged by other hosts, and the web services are also accessible and usable as normal -- but attempting the copy operation again results in the same failure, requiring another restart. As an experiment, I tried replacing the tar -- ssh pipeline above with a straight scp: $ scp -r datafolder/ [email protected]:~ but to no avail Thinking that the issue might have to do with the kernel packet-send buffers filling up, I tried increasing the buffer size to 12 MB (up from the 128 KB default) with # echo 12582911 > /proc/sys/net/core/wmem_max but this also had no effect. I'm guessing at this point that it might be a problem with the Microsoft synthetic network driver, but I don't really know. Does anyone have any suggestions? Thank you very much in advance!

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• how to model a many to many relationship

  - by Maulin

  Here is the scenario, Articles have many Comments Users can write many Comments for many Articles The comments table contains both user_id article_id as foreign keys My models are set up like so class User < ActiveRecord::Base has_many :comments has_many :articles, :through => :comments class Article < ActiveRecord::Base has_many :comments has_many :users, :through => :comments class Comment < ActiveRecord::Base belongs_to :users belongs_to :articles My routes.rb has the following code map.resources :articles, :has_many => :comments map.resources :users, :has_many => :comments which produces the following routes new_article_comment edit_article_comment new_user_comment edit_user_comment etc... This is not what I want (atleast not what I think I want), since comments must always be related to users and article, how can I get a route like so new_user_article_comment edit_user_article_comment Then I could just do new_user_article_comment_path([@user, @article]) to create a new comment

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• cURL Upload file AND send POST data

  - by kisplit

  Hello, I have a web server running some PHP that checks for an image (curl -F 'imageName=@myimage') and it also checks the POST data for username=&password=. When the PHP checks _REQUEST I can just do: curl -F 'imageName=@myimage' 'http://www.example.com/?upload=1&username=test&password=test' I need to instead check _POST for username and password due to specs. How can I upload the image and have the username=&password= post data? Any help appreciated!

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• Do you think the AI industry will ever come back?

  - by Isaiah

  I just spent some time reading about the collapse of the AI industry and realized a lot of the reason it failed was because technology was slow to catch up with their theories on when it would be available. I also read that it is believed computers that will be able to emulate human synapses may be made round 2015-2025. It's 2010 now and were getting pretty close to that time frame. I was wondering if anyone thinks that the AI industry will return as the technology lands? And if so, will it change the language market? Could Lisp like languages suddenly experience a burst of growth if it does? Idk I just thought it was interesting thinking about it.

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• Extracting data from Visual FoxPro databases

  - by whitequark

  I just got some 20Gb of data in a Visual FoxPro database with a custom frontend probably written in the same framework, and need to extract that data in any well-known format. I don't know anything about VFP in particular, but as it is SQL, there should be a way of opening an SQL console, or maybe an vfpdump utility. How can I do that? Everything I have now are a bunch of obscure binary files and a frontend executable.

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• data recovery after windows format with ubuntu 10.10

  - by mathew

  Hello, I had a system running Win 7 Home premium and ubuntu 10.04, side by side dual boot.I got an ubuntu 10.10 image disk so I decided to update.But during the installation I think I made a mistake by specifying the whole partition, and after installation of ubuntu 10.10 I saw that my windows and all the other data was gone.there was around 250GB of it.Is there any way I can recover this data??I had a lot of irreplacable photos and collections on the drive.I do have a recovery cd for my windows, but it does not detect any windows os.thanku very much. [email protected]

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• Extending hard disk size after hard drive regrow without losing data

  - by Albert Widjaja

  Hi All, I wonder if this is possible to extend or regrow the Linux hard disk partition from 8 GB to 20 GB without losing the existing data on the partition ? at the moment this Ubuntu Linux is deployed on top of VMware and I've just regrow the hard drive from 8 GB into 20 GB but can't see the effect immediately. can anyone suggest how to do this without losing the data ? and I found some strange error message when i do the fdisk -l ?

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• Change a Munin server and keep the data

  - by Khelben

  We are migrating some servers, and we need tp change our Munin server. Most of the Munin nodes are not changed, and we would want to keep track of the historical data, if possible. I can set up a new Munin server, but I like to know if it's possible to transfer the old data to the new server, and how to do it.

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• Ado.net entity model problem

  - by ognjenb

  public ActionResult Index() { using (testEntities korisnici = new testEntities()) { my_aspnet_users user = new my_aspnet_users(); user = from i in korisnici.my_aspnet_users select i; return View(user); } } Error: Cannot implicitly convert type 'System.Linq.IQueryable' to 'MyApp.Models.my_aspnet_users'. An explicit conversion exists (are you missing a cast?)

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• get and set for class in model - MVC 2 asp.net

  - by bergin

  Hi there, I want to improve the program so it has a proper constructor but also works with the models environment of MVC. I currently have: public void recordDocument(int order_id, string filename, string physical_path, string slug, int bytes) { ArchiveDocument doc = new ArchiveDocument(); doc.order_id = order_id; doc.filename = filename; doc.physical_path = physical_path; doc.slug = slug; doc.bytes = bytes; db.ArchiveDocuments.InsertOnSubmit(doc); } This obviously should be a constructor and should change to the leaner: public void recordDocument(ArchiveDocument doc) { db.ArchiveDocuments.InsertOnSubmit(doc); } with a get & set somewhere else - not sure of the syntax - do I create a partial class? so: creating in the somewhere repository - ArchiveDocument doc = new ArchiveDocument(order_id, idTaggedFilename, physical_path, slug, bytes); and then: namespace ordering.Models { public partial class ArchiveDocument { int order_id, string filename, string physical_path, string slug, int bytes; public archiveDocument(int order_id, string filename, string physical_path, string slug, int bytes){ this.order_id = order_id; etc } } How should I alter the code?

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• Rails application and multilingual content, Model dilemma

  - by dakull

  I'm writing in Rails a website that will be multilingual, for the application translation part i will use the simple I18n gem, for messages and everything related. Yet, all the content must be translated, and we're talking about lots of pages, that will be stored into the database ( like articles, news, etc. ) For now, I'm thinking of two approaches: Lets say i have a Pages table, the content in diff. languages, i will be storing it in a different table called PagesContent that will belong_to Pages and also to a Languages table. The problem here, is that I'll essentially duplicate the no. of tables needed. Pros: flexibility, in the box validation To skip that duplication i can serialize a hash into the content column of Pages, containing the translation. The problem here, is validation, arguably more code to write, and less flexibility when adding a new language. Pros: Less tables. Any other idea ?

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• Load balancers, multiple data centers and url based routing

  - by kunkunur

  There is one data center - dc1. There is a business need to setup another data center - dc2 in another geography and there might be more in the future say dc3. Within the data center dc1: There are two web servers say WS1 and WS2. These two webservers do not share anything currently. There isnt any necessity foreseen to have more webservers within each dc. dc1 also has a local load balancer which has been setup with session stickiness. So if a user say u1 lands on dc1 and if the load balancer decides to route his first request to WS1 then from there on all u1's requests will get routed to WS1. Local load balancer and webservers are invisible to the user. Local load balancer listens to the traffic on a virtual ip which is assigned to the virtual cluster of webservers ws1 and ws2. Virtual ip is the ip to which the host name is resolved to in the DNS. There are no client specific subdomains as of now instead there is a client specific url(context). ex: www.example.com/client1 and www.example.com/client2. Given above when dc2 is onboarded I want to route the traffic between dc1 and dc2 based on the client. The options that I have found so far are. Have client specific subdomains e.g. client1.example.com and client2.example.com and assign each of them with the virtual ip of the data center to which I want to route them. or Assign www.example.com and www1.example.com to first dc i.e. dc1 and assign www2.example.com to dc2. All requests will first get routed to dc1 where WS1 and WS2 will redirect the user to www1.example.com or www2.example.com based on whether the url ends with /client1 or /client2. I need help in the following If I setup a global load balancer between dc1 and dc2 do I have any alternative solutions. That is, can a global load balancer route the traffic based on the url ? Are there drawbacks to subdomain based solutions compared to www1 solution? With www1 solution I am worried that it creates a dependency on dc1 atleast for the first request and the user will see that he is getting redirected to a different url.

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• Linux data storage and partitioning

  - by Rajeev

  In the following output of df -h you can see that i have added a new hard drive(/dev/hdd1) and have mounted as /hdd1. My question is if I start dumping data to /opt will that data be mounted in /hdd1 or / My goal is to utilise the new hdd1 instead of old disk(/dev/sda3). How can this be done? Filesystem Size Used Avail Use% Mounted on /dev/sda3 442G 312G 12G 86% / tmpfs 1.9G 0 1.9G 0% /dev/shm /dev/sda1 194M 57M 128M 31% /boot /dev/sdb1 1.7T 201M 2.6T 1% /hdd1

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• Howto: Access a second related model in a nested attribute builder block

  - by Joe Cairns

  I have a basic has_many through relationship: class Foo < ActiveRecord::Base has_many :bars, :dependent => :destroy has_many :wtfs :through => :bars accepts_nested_attributes_for :bars, :wtfs end On my crud forms I have a builder block for the wtf, but I need the label to come from the bar (an attribute called label for instance). What's the proper method to do this? Here's the most simple scaffold: <h1>New foo</h1> <% form_for(@foo) do |f| %> <%= f.error_messages %> <p> <%= f.label :name %><br /> <%= f.text_field :name %> </p> <h2>Bars</h2> <% f.fields_for :wtfs do |builder| %> <%= builder.hidden_field :bar_id %> <p> <%= builder.text_field :wtf_data_i_need_to_set %> </p> <% end %> <p> <%= f.submit 'Create' %> </p> <% end %> <%= link_to 'Back', foos_path %>

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• Encrypt Data Prior to Upload

  - by TheW

  I'm looking to store some data online but I want to encrypt the files first. Since I understand that sFTP will only encrypt the transmission of the data, I'm wondering what program others use to encrypt their files prior to sFTPing them to a backup server. Thanks.

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• How would you structure your entity model for storing arbitrary key/value data with different data t

  - by Nathan Ridley

  I keep coming across scenarios where it will be useful to store a set of arbitrary data in a table using a per-row key/value model, rather than a rigid column/field model. The problem is, I want to store the values with their correct data type rather than converting everything to a string. This means I have to choose either a single table with multiple nullable columns, one for each data type, or a set of value tables, one for each data type. I'm also unsure as to whether I should use full third normal form and separate the keys into a separate table, referencing them via a foreign key from the value table(s), or if it would be better to keep things simple and store the string keys in the value table(s) and accept the duplication of strings. Old/bad: This solution makes adding additional values a pain in a fluid environment because the table needs to be modified regularly. MyTable ============================ ID Key1 Key2 Key3 int int string date ---------------------------- 1 Value1 Value2 Value3 2 Value4 Value5 Value6 Single Table Solution This solution allows simplicity via a single table. The querying code still needs to check for nulls to determine which data type the field is storing. A check constraint is probably also required to ensure only one of the value fields contains non-nulll data. DataValues ============================================================= ID RecordID Key IntValue StringValue DateValue int int string int string date ------------------------------------------------------------- 1 1 Key1 Value1 NULL NULL 2 1 Key2 NULL Value2 NULL 3 1 Key3 NULL NULL Value3 4 2 Key1 Value4 NULL NULL 5 2 Key2 NULL Value5 NULL 6 2 Key3 NULL NULL Value6 Multiple-Table Solution This solution allows for more concise purposing of each table, though the code needs to know the data type in advance as it needs to query a different table for each data type. Indexing is probably simpler and more efficient because there are less columns that need indexing. IntegerValues =============================== ID RecordID Key Value int int string int ------------------------------- 1 1 Key1 Value1 2 2 Key1 Value4 StringValues =============================== ID RecordID Key Value int int string string ------------------------------- 1 1 Key2 Value2 2 2 Key2 Value5 DateValues =============================== ID RecordID Key Value int int string date ------------------------------- 1 1 Key3 Value3 2 2 Key3 Value6 How do you approach this problem? Which solution is better? Also, should the key column be separated into a separate table and referenced via a foreign key or be should it be kept in the value table and bulk updated if for some reason the key name changes?

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• Expose JSON as queryable for jQuery

  - by Ted

  I am trying to expose some data, user names, as json format on my server. I want to use jQuery.getJSOn() method to query data. I can get my data converted to json with newtonsoft.dll on server and save it in a file. But as far as I know it is not queryable. I want something like http://search.twitter.com/search.json?callback=?&q=abc Can anyone help me out to expose my data ion the above format.

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• CakePHP model useTable with SQL Views

  - by Chris

  I'm in the process converting our CakePHP-built website from Pervasive to SQL Server 2005. After a lot of hassle the setup I've gotten to work is using the ADODB driver with 'connect' as odbc_mssql. This connects to our database and builds the SQL queries just fine. However, here's the rub: one of our Models was associated with an SQL view in Pervasive. I ported over the view, but it appears using the set up that I have that CakePHP can't find the View in SQL Server. Couldn't find much after some Google searches - has anyone else run into a problem like this? Is there a solution/workaround, or is there some redesign in my future?

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