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• Set date format in ruby model (sinatra/datamapper)

  - by Gearóid

  Hi, I have a ruby model that contains a date attribue which I'd like to be able to pass in as a parameter in the format dd/MM/yyyy. However, my sqlite3 db stores the data in yyyy-MM-dd format so when a date like 20/10/2010 gets passed in, it will not be read to the database. I am using the Sinatra framework and using haml for the markup creation. Do I need to write a helper that takes the date string and converts it to the correct format for the db? Or can I set a format type on the models attribute? Thanks.

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• Build custom error messages in model files (example: using the 'pluralize' method)

  - by user502052

  I am using Ruby on Rails 3.0.7 and I would like to use the pluralize method in a my model file in order to properly build custom error messages. For example, I would like to do something like the following: NAME_MIN_LENGHT = 2 # Is 2 but I plan to change that (maybe dynamically... if it is possible) in future development validates :name, :length => { :minimum => NAME_MIN_LENGHT, :too_short => "is too short (minimum is #{pluralize(NAME_MIN_LENGHT, "character")})", }, How can I do that? Is it advisable? Why?

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• Scala model-view-presenter, traits

  - by Ralph

  I am a fan of Martin Fowler's (deprecated) model-view-presenter pattern. I am writing a Scala view class containing several button classes. I would like to include methods to set the action properties of the buttons, to be called by the presenter. A typical code fragment looks like this: private val aButton = new JButton def setAButtonAction(action: Action): Unit = { aButton.setAction(action) } This code is repeated for each button. If Java/Scala had the C preprocessor, I would create a macro to generate this code, given the button name (no lectures on the evils of the C preprocessor, please). This code is obviously very verbose and repetitive. Is there any better way way to do this in Scala, perhaps using traits? Please hold the lectures about scala.swing. I looking for a general pattern here.

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• QuestionOrAnswer model?

  - by Mark

  My site has Listings. Users can ask Questions about listings, and the author of the listing can respond with an Answer. However, the Answer might need clarification, so I've made them recursive (you can "answer" an answer). So how do I set up the database? The way I have it now looks like this (in Django-style models): class QuestionOrAnswer(Model): user = ForeignKey(User, related_name='questions') listing = ForeignKey(Listing, related_name='questions') parent = models.ForeignKey('self', null=True, blank=True, related_name='children') message = TextField() But what bugs me is that listing is now an attribute of the answers as well (it doesn't need to be). What happens if the database gets mangled and an answer belongs to a different listing than its parent question? That just doesn't make any sense. We can separate it with polymorphism: QuestionOrAnswer user message created updated Question(QuestionOrAnswer) shipment Answer(QuestionOrAnswer) parent = ForeignKey(QuestionOrAnswer) And that ought to work, but now ever question and answer is split into 2 tables. Is it worth this overhead for clearly defined models?

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• Saving model object in django throws no error but attribute value doesn't change

  - by Pilgrim

  Hi. I get a model object, change an attribute, save it and it still has the old attribute: >>> g = SiteProfile.objects.get(pk=3) >>> g.renew_date datetime.date(2010, 4, 11) >>> g.renew_date = date.today()+timedelta(days=365) >>> g.renew_date datetime.date(2011, 4, 11) >>> g.save() >>> g.renew_date datetime.datetime(2010, 4, 11, 16, 57, 4, 192684) Anyone know if this is an issue with the database or something else?

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• PHP form post, automatically mapping to an object (model binding)

  - by Pete Nelson

  I do a lot of ASP.NET MVC 2 development, but I'm tackling a small project at work and it needs to be done in PHP. Is there anything built-in to PHP to do model binding, mapping form post fields to a class? Some of my PHP code currently looks like this: class EntryForm { public $FirstName = ""; public $LastName = ""; } $EntryForm = new EntryForm(); if ($_POST && $_POST["Submit"] == "Submit") { $EntryForm->FirstName = trim($_POST["FirstName"]); $EntryForm->LastName = trim($_POST["LastName"]); } Is there anything built-in to a typical PHP install that would do such mapping like you'd find in ASP.NET MVC, or does it require an additional framework?

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• Rails ActiveRecord- has_many through and belongs_to a related model

  - by Nick

  I have 3 models sites, user_favorites and users. Relevant relationships: class Site < ActiveRecord::Base has_many :users, :through => :user_favorites class UserFavorite < ActiveRecord::Base belongs_to :user, :counter_cache => true belongs_to :site end class User < ActiveRecord:Base has_many :user_favorites has_many :sites, :through => :user_favorites All of that works just fine. I'd like to add a new attribute to the Site model to indicate which user created it. I don't believe this constitutes a has_and_belongs_to_many scenario. A site has many users through user_favorites but I want it to belong to a single user reflecting the owner/creator. I'm wondering what the ORM best practice is for this. SQL wise I'd just use different joins depending on what I was trying to query with a created_by FK in Site. Sorry if I'm missing something basic here. Thanks

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• Unit Testing Model Classes that inherits from NSManagedObject

  - by Matt Baker

  So...I'm trying to get unit tests set up in my iPhone App but I'm having some issues. I'm trying to test my model classes but they inherit directly from NSManagedObject. I'm sure this is a problem but I don't know how to get around it. Everything is building and running as expected but I get this error when calling any method on the class I'm testing: Unknown.m:0:0 unrecognized selector sent to instance 0xc2b120 If I follow this structure (http://chanson.livejournal.com/115621.html) to create my object in my tests I end up with another error entirely but it still doesn't help me. Basically my question is this: how can I test a class that inherits from NSManagedObject?

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• How to get attribute of a model saved in instance variable

  - by Nazar

  I am writing a plugin, in which i define a new relation dynamically with in plugin. Sample code is given below module AttachDocumentsAs @as = nil def attach_documents_as(*attachment_as) attachment_as = attachment_as.to_a.flatten.compact.map(&:to_sym) @as = attachment_as.first class_inheritable_reader(@as) class_eval do has_many @as, :as => :attachable, :class_name=>"AttachDocuments::Models::AttachedDocument" accepts_nested_attributes_for @as end end end now in any model i used it as class Person < AtiveRecord::Base attach_documents_as :financial_documents end Now want to access want to access this attribute of the class in overloaded initialize method like this def initialize(*args) super(*args) "#{@as}".build end But it is not getting required attribute, can any one help me in it. I want to build this relation and set some initial values. Waiting for guidelines from all you guys.

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• Saving related model objects

  - by iHeartDucks

  I have two related models (one to many) in my django app and When I do something like this ObjBlog = Blog() objBlog.name = 'test blog' objEntry1 = Entry() objEntry1.title = 'Entry one' objEntry2 = Entry() objEntry2.title = 'Entry Two' objBlog.entry_set.add(objEntry1) objBlog.entry_set.add(objEntry2) I get an error which says "null value in column and it violates the foreign key not null constraint". None of my model objects have been saved. Do I have to save the "objBlog" before I could set the entries? I was hoping I could call the save method on objBlog to save it all. NOTE: I am not creating a blog engine and this is just an example.

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• How to change Zend_Db_Table name within a Model to insert in multiple tables

  - by jwhat

  Using Zend Framework, I've created a Model to insert a record into a database. My question is, after $this->insert($data) how can I switch the active table so that I can insert a record into another table? Here's my code so far: class Model_DbTable_Foo extends Zend_Db_Table_Abstract { protected $_name = 'foo'; public function addFoo($params) { $data = array( 'foo' => $params['foo'], ); $this->insert($data); $foo_id = $this->getAdapter()->lastInsertId(); $data2 = array( 'bar' => $params['bar'] ); // I need to change the Db Table name here. $this->insert($data2); $bar_id = $this->getAdapter()->lastInsertId(); } }

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• print hierarchy data(adjacency list model) in a list(ul/ol/li)

  - by adi

  I have adjacency list model like on the page http://dev.mysql.com/tech-resources/articles/hierarchical-data.html i have make a full table containing all data ordered by level using this SELECT t1.name AS lev1, t2.name as lev2, t3.name as lev3, t4.name as lev4 FROM category AS t1 LEFT JOIN category AS t2 ON t2.parent = t1.category_id LEFT JOIN category AS t3 ON t3.parent = t2.category_id LEFT JOIN category AS t4 ON t4.parent = t3.category_id WHERE t1.name = 'ELECTRONICS'; ORDER by ..... I want to make an unordered list using php from the table Anyone can help me...

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• habtm multiple times with the same model

  - by Ermin

  I am trying to model a publications. A publication can have multiple authors and editors. Since it is possible that one person is an author of one publication and an editor of another, no separate models for Authors and Editors: class Publication < ActiveRecord::Base has_and_belongs_to_many :authors, :class_name=>'Person' has_and_belongs_to_many :editors, :class_name=>'Person' end The above code doesn't work, because it uses the same join table. Now I now that I can specify the name of the join table, but there is a warning in the API documentation is a warning about that which I don't understand: :join_table: Specify the name of the join table if the default based on lexical order isn’t what you want. WARNING: If you’re overwriting the table name of either class, the table_name method MUST be declared underneath any has_and_belongs_to_many declaration in order to work.

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• What comes first in Ruby's object model?

  - by Timothy

  I've been reading Metaprogramming Ruby and the object model like the chicken or egg dilemma. In Ruby 1.8, the Object class is an instance of Class. Module's superclass is Object and is an instance of Class. Class' superclass is Module, and it is an instance of Class (self-referential). Say class SomeClass; end is defined somewhere; SomeClass is an instance of Class, however its superclass is Object. Why does an instance of Class have Object as the superclass instead of nil? Also, if Object is to exist, then Class has to exist, but then Module has to exist, but for Module to exist Object has to exist. How are these classes created?

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• Using :limit and :order in the associated model

  - by r2b2

  Hello, Is there any way i can limit the results of an associated model? This what i was trying to do : <ul> <% account.logins.slice(0,5).sort_by(&:login_date).reverse.each do |login| -%> <li><%=h login.login_date.strftime("%d.%m.%Y")%></li> <% end -%> </ul> I'm trying to get the last five logins of the account. I cant seem to do it with account.logins(:limit=5) Thanks !

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• Ruby - model.rb:20: syntax error, unexpected keyword_end, expecting $end

  - by Yasir Adnan

  I don't understand what's wrong with my code. model.rb require 'Gemfile' DataMapper.setup(:default, 'mysql://root:password@localhost/rengine') Class User include DataMapper::Resource property :id, Serial # An auto-increment integer key property :email, String, format: :email_address property :username, String, required: true property :password, String , length: 10..255, required: true property :created_at, DateTime property :updated_at, DateTime #User can have mutiple posts has n, :posts end Class Post include DataMapper::Resource property :id, Serial # An auto-increment integer key property :title, String, required: true property :body, Text, required: true property :created_at, DateTime property :updated_at, DateTime #Posts belongs to a USer belongs_to :user end DataMapper.auto_upgrade! I didn't able to figure out. What's problem is here??

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• JSF - Updating Model Values in Controller Bean

  - by Sean

  I have a Controller bean (SearchController) that has two managed bean as managed properties (SearchCriteria, SearchResults; both of which are session scoped). When the user hits the find button, the action method that is executed is in SearchController. The SearchCreteria managed bean has a method called search(). This method returns a new SearchResults object. In the controller bean, I am setting the searchResults managed property to be this new SearchResults object. The searchResults object contains what I expect during that request, but the object does not persist in the managed bean. I understand that I am changing what object that searchResults is referencing, but what I don't understand is why JSF isn't updating the model to use the new object. Any ideas what I'm missing or don't understand? I am using JSF 1.1 on WebSphere 6.1. If I put the search method in the SearchResults managed bean, it works.

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• .net remoting, how to detect disconnected/crashed clients from the server?

  - by tadmarsky

  how to detect disconnected/crashed clients from the server?

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• Include a Class in another model / class / lib

  - by jaycode

  I need to use function "image_path" in my lib class. I tried this (and couple of other variations): class CustomHelpers::Base include ActionView::Helpers::AssetTagHelper def self.image_url(source) abs_path = image_path(source) unless abs_path =~ /^http/ abs_path = "#{request.protocol}#{request.host_with_port}#{abs_path}" end abs_path end end But it didn't work. Am I doing it right? Another question is, how do I find the right class to include? For example if I look at this module: http://api.rubyonrails.org/classes/ActionView/Helpers/AssetTagHelper.html is there a rule of thumb how to include that module in a model / library / class / anything else ?

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• Animate 3D model programmatically-where to start?

  - by amile

  I am having a task to create a 3D model face that can talk like humans.without having any knowledge about 3D modeling. I have no clue where to start.I have searched a lot and find some of these things.OpenGL,WebGL,XNA and other similar tool can be helpful. please guide me where to start a step by step approach and which platform is better as i have programming background in JAVA. here is an idea what I need to do https://docs.google.com/viewer?a=v&pid=gmail&attid=0.2&thid=13f65486a46a1f67&mt=application/pdf&url=https://mail.google.com/mail/?ui%3D2%26ik%3D49f1f393c6%26view%3Datt%26th%3D13f65486a46a1f67%26attid%3D0.2%26disp%3Dsafe%26realattid%3Df_hi6ylzbv2%26zw&sig=AHIEtbQc8KQNHdprmEnL4UXyD3ox8vlKKQ

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• In Grails, How can I create a domain model to link two of another model?

  - by gerges

  Hey all, I'm currently trying to create a Friendship domain object to link two User objects (with a bit of additional data: createDate, confirmedStatus). My domain model looks as follows class Friendship { User userOne User userTwo Boolean confirmed Date createDate Date lastModifiedDate static belongsTo = [userOne:User , userTwo:User] static constraints = { userOne() userTwo() confirmed() createDate() lastModifiedDate() } } I've also added the following entries to the user class static hasMany = [ friendships:Friendship ] static mappedBy = [ friendships:'userOne' , friendships:'userTwo' ] When I do this, the result is a new friendship created (and viewable through the controller) with both users listed in their respective places. When I view the details of userOne, I see the friedship listed. When I view the details of userTwo, no friendship is listed. This is not the behavior I expected. What am I doing incorrectly? Why can't I see the friendship listed under both users?

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• Best way to model Customer <--> Address

  - by Jen

  Every Customer has a physical address and an optional mailing address. What is your preferred way to model this? Option 1. Customer has foreign key to Address Customer (id, phys_address_id, mail_address_id) Address (id, street, city, etc.) Option 2. Customer has one-to-many relationship to Address, which contains a field to describe the address type Customer (id) Address (id, customer_id, address_type, street, city, etc.) Option 3. Address information is de-normalized and stored in Customer Customer (id, phys_street, phys_city, etc. mail_street, mail_city, etc.) One of my overriding goals is to simplify the object-relational mappings, so I'm leaning towards the first approach. What are your thoughts?

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• EntityDataSource Unable to configure to Entity Model

  - by photo_tom

  I'm doing my first test asp.net3.5 app using EntityDataSource. I've got the basic project built and the Entity model created and compiled. Database is a local sqlexpress one in app_data directory. When I put the <asp:EntityDataSource /> control on the page and try to configure it, I'm getting the message "The list of named connections could not be loaded because the configuration could not be opened". At this point, everything in the project is "auto-created" by Visual Studio 2008sp1. I confused as I cannot find any information on how to correct from this message.

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• in .net, what programming model would be good for prototyping, but then reusable for production (for

  - by Greg

  Hi, In .NET land what would be a good approach for quick prototyping of a concept (i.e. development just on my PC) that could then be extended out to product (users across LAN/WAN), BUT in a fashion that the model/business logic code and data access layer code can be used as is? One thought for example I had as to do: (a) WinForms with business logic and Entity Framework layer to SQL Server Express on my PC, then (b) Go then to ASP.net (using the business logic / data library) with SQL Server/IIS Any comments? Other suggestions?

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• Entity Framework 4.1 auto generate with DbContext when creating ADO.NET Entity Data Model

  - by smudgedlens

  I would like to work with DbContext instead of ObjectContext. I updated EF so now I have the DbContext, but I want to generate my strongly-typed context based on the DbContext and not the ObjectContext. When I add new ADO.NET Entity Data Model, it is still based on the ObjectContext. Is it not possible to have it base off of DbContext in Visual Studio 2010 with EF 4.1? UPDATE: Okay, I followed the directions in this link and was able to generate the DbContext template objects. However, now it is saying there is ambiguity between the template entities and the entities in my .edmx file. How do I resovle this? Do I blow away the ones in the .edmx file?

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