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• Invoicing vs Quoting

  - by FreshCode

  If invoices can be voided, should they be used as quotations? I have an Invoices tables that is created from inventory associated with a Job. I could have a Quotes table as a halfway-house between inventory and invoices, but it feels like I would have duplicate data structures and logic just to handle an "Is this a quote?" bit. From a business perspective, quotes are different from invoices: a quote is sent prior to an undertaking and an invoice is sent once it is complete and payment is due, but how to represent this in my repository and model. What is an elegant way to store and manage quotes & invoices in a database?

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• Full outer join in django

  - by Ber

  How can I create a query for a full outer join across a M2M relationchip using the django QuerySet API? It that is not supported, some hint about creating my own manager to do this would be welcome. Edited to add: @S.Lott: Thanks for the enlightenment. The need for the OUTER JOIN comes from the application. It has to generate a report showing the data entered, even if it still incomplete. I was not aware of the fact that the result would be a new class/model. Your hints will help me quite a bit.

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• Is using jquery to call a WCF Data Service from the UI violating the MVC pattern.

  - by Lee Dale

  I'm fairly new to ASP.Net MVC 2 and understand the MVC pattern in itself. But my question is what's the best way to populate dropdownlists in the UI sticking to the MVC pattern. Should I be going through the controller? Every article I've seen to do this shows how to do it using javascript and jquery. I have a test application that I'm re-writing in MVC2 I have my dropdowns working with jquery basically calling a WCF Data Service that returns JSON which populates the dropdowns. Seems to me though that this is bypassing the controller and going straight to the model therefore strictly violating the MVC pattern. Or am I missing something obvious here. You thoughts or best practices would be greatly welcome here. Thanks

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• EXTEND_MODEL_CASES SQL 2005 workaround

  - by user282382

  Hi, I have a time series based mining model in SQL 2005 Analysis Serveries. I understand in 2008 you can do what if analysis by using EXTEND_MODEL_CASES with a Natural Prediction Join. I'm looking for a workaround or some method of doing the same thing but with 2005. My time series has 3 inputs, and one predict_only. I'd like to use the prediction function to see what types of prediction it makes for 6-12 time intervals in the future with inputs in a separate table. Is there any way to do this or something similar? Thanks

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• Django equivalent for latest entry for each user

  - by paul-ogrady

  Hi, I'm surprised this question hasn't come up. Couldn't find much on the web. Using Entry.objects.latest('created_at') I can recover the latest entry for all Entry objects, but say if I want the latest entry for each user? This is something similar to an SQL latest record query. But how do I achieve this using the ORM? Here is my approach I'm wondering if it is the most efficient way to do what I want. First I perform a sub query: Objects are grouped by user and the Max (latest) created_by field is returned for each user (created_at__max) I then filter Entry objects based on the results in the subquery and get the required objects. Entry.objects.filter(created_at__in=Entry.objects.values('user').annotate(Max('created_at')).values_list('created_at__max')) or using a manager: class UsersLatest(models.Manager): def get_query_set(self): return Super(UsersLatest,self).get_query_set().filter(created_at__in=self.model.objects.values('user').annotate(Max('created_at')).values_list('created_at__max')) Is there a more efficient way? possibly without sub query? Thanks, Paul

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• ActiveScaffold complains about association

  - by Bilal Aslam

  I'm using ActiveScaffold to create an Admin UI. I have two models: Post and Comments. A Post has-many Comments, and a Comment belongs-to a post. There's a validates_presences_of :text validation the Comment model. The problem is that when I create a new Post from the Admin UI without creating a new Comment in the subform, ActiveScaffold complains about the validation. I can create the Post if I also create a Comment associated with it, which is not what I Want. I can create a new Post manually from script/console. What gives?

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• creating managed objects using code in xcode & core-data

  - by themadpeacock

  New to objective-c xcode and core-data so sorry for the remedial question. I have set up a very simple data model: Entity1 and Entity2, both contain a single attribute (String) and a one-to-many relationship with the other. I want to scan Entity1 and depending on the results of the scan create one or more Entity2 objects that link to Entity1. How can I do this? I don’t understand how I create Entity2 type objects in code and how I would define the relationship to the Entity1 object they are related to. I come from a SQL programming background where inserting elements into the Entity2 table with the ID of the related Entiry1 entry is easy. I can’t get my head around the xcode core-data abstraction and would appreciate any help.

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• cakePHP - ACL tutorial & SQL Error: 1104

  - by vector

  Greetings! I run into a problem/bug in production environment with SQL Error: 1104 when deploying a project secured with the ACL tutorial. The full error: SQL Error: 1104: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay [CORE/cake/libs/model/datasources/dbo_source.php, line 666] I've build a small site, worked through the ACL tutorial from the official cake book and locally everything is spiffy. dev. setup consists of: XAMPP: myslq 5.1.33, php 5.3 cakePHP 1.2.7 prod. setup: mysql 5.0.33 php 5.2.2 One of the differences I noticed with mysql setup between local and production servers, is that SQL_BIG_SELECTS is disabled on the production server ( and I don't have privileges to change that, posted a support ticked, didn't hear anything yet) Is there anything I can do about this from my end? Thanks in advance.

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• UITableView's cellForRowAtIndexPath is not getting called after low memory warning

  - by Jinesh

  I am new to COCOA and Objective C. I am working on an application which have two controllers with one table view in each, clicking an item form this table will lead to another controller to be pushed to the stack. All was working fine till i started handling low memory warning in app delegate. What i am doing in app delegate's applicationDidReceiveMemoryWarning is, deleting all of my model and popping out all controllers to its root view using popToRootViewControllerAnimated. Now my problem starts, once low mem warning is received table's cellForRowAtIndexPath is not getting called. All other methods of UITableViewDataSource is properly called. What i get on screen is a blank white screen. I am testing my app in iPhone OS 3.0 and development is done in Xcode V 3.1.3. Hope you guys can help me to nail this. Thanks in advance, Jinesh.

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• Polymorphic association in reverse

  - by Erik

  Let's say that I have two models - one called Post and one other called Video. I then have a third model - Comment - that is polymorphically associated to to each of these models. I can then easily do post.comments and video.comments to find comments assosciated to records of these models. All easy so far. But what if I want to go the other way and I want to find ALL posts and videos that have been commented on and display these in a list sorted on the date that the comment was made? Is this possible? If it helps I'm working on Rails 3 beta.

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• What is the purpose of Managers / Transactions?

  - by maxdj

  I'm building a spring application for the first time. I'm running into lots of problems with concurrency, and I suspect that there is something wrong with the way I'm managing the backend. The only difference I can see between my backend code and examples I've seen are manager classes. In my code, I have my model (managed by hibernate) and my DAOs on top of that to do CRUD/searching/etc on the models. In example code I have looked at, they never use the DAO directly. Instead, they use manager classes that call the DAOs indirectly. To me, this just seems like pointless code duplication. What are these manager classes for? I've read that they wrap my code in "transactions," but why would I want that?

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• Hibernate: can I override an identifier generator using XML with a custom generator?

  - by Ken Liu

  I want to use a custom sequence generator in my application, but the entity is located in a domain model jar that is shared with other applications. Apparently entity annotations can be overridden in orm.xml but I can't figure out the proper XML incantation to get this to work. I can modify the annotation in the entity like this this: @GenericGenerator(name = "MYGEN", strategy = "MyCustomGenerator") @GeneratedValue(generator = "MYGEN") But I need to somehow map this to orm.xml in order to override the original annotation. Looking at the orm.xml schema here it appears that I can't even specify a generation type besides "sequence" and "table".

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• Authlogic Multiple Password Validation

  - by Hock

  Hello, I'm using Authlogic to manage my user sessions. I'm using the LDAP add-on, so I have the following in my users model acts_as_authentic do |c| c.validate_password_field = false end The problem is that recently I found out that there will be some users inside the application that won't be part of the LDAP (and can't be added!). So I would need to validate SOME passwords against the database and the others against the LDAP. The users whose password will be validated against the database will have an specific attribute that will tell me that that password will be validated in my database. How can I manage that? Is it possible that the validate_password_field receives a "variable"? That way I could create some method that will return true/false depending on where the password validation will be done? Thanks! Nicolás Hock Isaza

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• Image selector/picker

  - by MrThomas

  Using Ruby on Rails what steps can I take to create a image picker. This is a image object which I can use all over my app: Using paperclip and a polymathic association making images available to all other models. I wish to list the images in each model and chose which of them is associated to a individual new or old record. for example: I could use the image as a sidebar image or a banner or advert image etc. I would be great full for any help. Thanks Dan

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• asp.net MVC Partial Views how to initialise javascript

  - by Simon G

  Hi, I have an edit form that uses an ajax form to submit to the controller. Depending on the data submitted I redirect the user to one of two pages (by returning a partial view). Both pages rely on javascript/jquery and neither use anything common between the pages. What is the best way to initialise these javascripts on each page? I know there is the AjaxOption OnComplete but both pages are quite dynamic depending on the Model passed and I would rather keep the javascript for both pages seperate rather than having a common method. Thanks

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• Two fields with the same name

  - by H. Abraham Chavez

  I have a ViewModel class to encapsulate "Personal" and "Business" models. My problem is that both models have a property called "Email" and the model binding is not able to make a distinction between the too. I read that [Bind(Prefix = ... is used to resolved this issue, but I have not been able to see a concise example on how to achieve this. SO community please help. public class BusinessFormViewModel { public Business Business { get; set; } public ContactPerson ContactPerson { get; set; } public BusinessFromView(Business business, ContactPerson contactPerson) { Business = business; ContactPerson = contactPerson; } }

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• Print the jena result set in html(servlet/jsp).

  - by Udayanga

  hi, I'm using servlet for manipulating ontology.I got the result of my SPARQL query and I want to display(print) that result in JSP(Servlet). Following code segment can be used to print the result in console. . . . com.hp.hpl.jena.query.Query query = QueryFactory.create(queryStr); QueryExecution qe = QueryExecutionFactory.create(query,model); com.hp.hpl.jena.query.ResultSet rs = qe.execSelect(); ResultSetFormatter.out(System.out, rs); any idea..? Thank in advance!

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• Rails uniqueness constraint and matching db unique index for null column

  - by Dave

  I have the following in my migration file def self.up create_table :payment_agreements do |t| t.boolean :automatic, :default => true, :null => false t.string :payment_trigger_on_order t.references :supplier t.references :seller t.references :product t.timestamps end end I want to ensure that if a product_id is specified it is unique but I also want to allow null so I have the following in my model: validates :product_id, :uniqueness => true, :allow_nil => true Works great but I should then add an index to the migration file add_index :payment_agreements, :product_id, :unique => true Obviously this will throw an exception when two null values are inserted for product_id. I could just simply omit the index in the migration but then there's the chance that I'll get two PaymentAgreements with the same product_id as shown here: Concurrency and integrity My question is what is the best/most common way to deal with this problem

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• iPhone: Core Data: Updating a pre-filled database in future app versions.

  - by Cuzog

  I am creating an app with a database of information that needs to be pre-filled. This data will change in future versions. In the same database, I also need to store user editable information since that user edited data directly relates to the pre-filled data. My question is, if I'm pre-filling the database by creating a duplicate data model in a second app and copying over the core data file before release, how would I handle updates to that data in future versions of the app without destroying the user's existing data? Do the core data migration methods handle this, or must I write custom methods to programatically handle the merge at first app launch?

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• How to create an EFI System Partition?

  - by Alex Popov

  TL; DR How do I create an EFI system partition from scratch? How do I put the EFI firmware on it onces it is created? Long version I hava Toshiba T430 laptop. I received it with Windows 7 installed (but I think originally it has shipped with Windows 8). I installed Ubuntu on it, but deleted some partitions on the disk so that I ended up wiping out the Windows and only having Ubuntu. Among the deleted partitions was the EFI System partition. I discovered that Ubuntu now boots in Legacy mode (and not UEFI). I am trying to follow this guide on converting my Ubuntu installation from Legacy to UEFI. The problem - since there is no EFI partition whenever I choose from BIOS to boot using UEFI I cannot boot. That counts not only for the harddrive, but usb and DVD as well. I think this is logical - it expects an EFI partition and since it can't find it, it cannot continue booting futher, be it from HDD or DVD. So how do I recreate the EFI partition? The guide above says: Creating an EFI partition If you are manually partitioning your disk in the Ubuntu installer, you need to make sure you have an EFI partition set up. If your disk already contains an EFI partition (eg if your computer had Windows8 preinstalled), it can be used for Ubuntu too. Do not format it. It is strongly recommended to have only 1 EFI partition per disk. An EFI partition can be created via a recent version of GParted (the Gparted version included in the 12.04 disk is OK), and must have the following attributes: Mount point: /boot/efi (remark: no need to set this mount point when using the manual partitioning, the Ubuntu installer will detect it automatically) Size: minimum 100Mib. 200MiB recommended. Type: FAT32 Other: needs a "boot" flag. I had some trouble creating this partition: I boot from a live Ubuntu DVD, open GParted, create a 200MB partition and format it to FAT32. In GParted I cannot set the mount point and thus cannot set the bootflag. I didn't set the mount point in /etc/fstab since it's a live CD and fstab looked quite differently from what I expected compared to a normal boot. Anyway, I just didn't know what values to set. I booted again via the live DVD and then chose to install Ubuntu. I then created a partition with the mentioned criteria - mount point, 200MB, FAT32, boot flag. However, I continue to have this problem and I suppose it's because on that partition there is no EFI firmware, it's just an empty partition, which is suitable to have EFI firmware. So again, how do I create an EFI partition, which has the EFI software, so that the laptop can once again boot in UEFI mode?

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• Reading option values in select

  - by user281180

  I have select values as follows: <select id="SelectBox" multiple="multiple"> <% foreach (var item in Model.Name) { %> <option value="<%= item.Value %>"><%=item.Text%></option> <% } %> </select> I have a function in jquery that will have to read both the text and value. I need to have the values in array so that I can display them in a table with a column Id and another column text. My problem is that Im not able to retrieve each and every value separately. Im having the text in one line, test1test2test3. function read() { $("#SelectBox").each(function() { var value = $(this).val(); var text = $(this).text(); alert(value);alert(text); }); }

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• Free for personal use license?

  - by Lance May

  I'm trying desperately to find a software licensing model that would allow me to make my product completely open to the public domain for personal use/modification, but would be able to be sold commercially. I know such a beast exists, and I'm sure in many flavors. I just can't find it. ;( What I'm hoping for is a way to allow people the opportunity to benefit from the product in an "open source" fashion, while still allowing me to have a revenue on it to be able to continue development full time. Thanks much in advance.

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• Branch by abstraction: Are there "examples" of how it can be done?

  - by Philipp Keller

  Having read Martin Fowlers "Feature Branch" and Flickrs "Flipping Out" (http://www.liip.to/flippingout) I guess there are a few guys out there who do: all (or most) development on Trunk release Trunk regularly (assuming updating your web site) not-yet-approved or not-yet-finished features should not be visible/have no impact on the regular user I've got 2 questions: granted - Flickr's article seems to work for "frontend code". But how is it cleaned up? Don't the ifs pile up? how does this work for the more "backend part"? Thinking of database changes, or model refactoring. Working with ifs doesn't seem to work - and copy-pasting classes for small adaptions also seems awkward. Are there any articles out there answering these 2 questions?

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• Comparing ASP.Net Framework to Cakephp, Zend , Ruby on Rails

  - by numerical25

  I am a PHP developer migrating to C# ASP.Net Framework. As of right now, I am experienced in using Php for developing sites and I use CakePhp and Zend framework as my RAD tools to help me produce better applications. As I move over to ASP.NET, I have this view that C# ASP.Net framework itself is already a RAD tool and is equivalent to using Cakephp, Zend, or even Ruby on Rails. So I really shouldn't have no concerns trying to find a separate library for ASP.NET that will help me produce better applications. To me, in a sense the ASP.NET is already like a MVC cause it seperates the model from the view and the methods are almost like controllers. So as far as having the best tools are concerned, should I be satisfied with just using ASP.NET as my RAD tool.

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• How to organize a ASP.NET MVC solution (DDD)

  - by vandalo

  Hello everyone. I am trying to start a new project (asp.net MVC) and I would like to apply some DDD rules I've learned in these last few months. I don't know how to organize my solution though. I would like to use Nhibernate but I don't want to use Fluent Nhibernate cause it must be something like an experiment. I've seen some examples where people keep everything in the same project. Some others tend to create a different project for everything. Do you think I should differentiate the model and the repository or put it in the same project? If someone has some links to articles etc it would be appreciated. thanks Alberto

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