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• Entity Framework 4 omits some associations during model generation

  - by kzen

  After creating an EF4 model from a SQL Server database I noticed that all the relationships of my Users table were not imported into the model as associations. All the other relationships were imported fine. My Users table has a PK userId which is a char(7) field and it is integrated into several other tables in the database as an FK but for some reason EF4 does not import these relationships as associations during the model generation process... Does anyone have any ideas why this would be happening?

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• Windows 7 File Associations .mov

  - by Paul Mung

  I created a new windows 7 SP1 base image. Everything is all fine and dandy with that. So i am now installing standard applications I would like Quicktime to manage .mov files. The only problem is WMP (Windows Media Player) won't give up the association to .mov files. It's driving me crazy... i've been reading threads on how to fix file associations. I would like to do it via registry, powershell or cmdline. I cannot use GPO I've tried the following: assoc .mov=QuickTime.mov ftype QuickTime.mov="%ProgramFiles(x86)\QuickTime\QuickTimePlayer.exe" Reg add HKCU\Software\Microsoft\windows\CurrentVersion\Explorere\FileExts\.mov\UserChoice" /v Progid /d QuickTime.mov /f Reg add HKCU\Software\Microsoft\windows\CurrentVersion\Explorere\FileExts\.mov\OpenWithList" /v a /d QuickTimePlayer.exe /f Reg add "HKCU\Software\Microsoft\windows\CurrentVersion\Explorere\FileExts\.mov\OpenWithList" /v b /d wmplayer.exe /f Reg add HKCU\Software\Microsoft\windows\CurrentVersion\Explorere\FileExts\.mov\OpenWithList" /v MRUList /d ab /f Reg add HKCU\Software\Microsoft\windows\CurrentVersion\Explorere\FileExts\.mov\OpenWithProgids" /v Quicktime.mov /t REG_NONE /d 0000 /f Reg add HKCU\Software\Microsoft\windows\CurrentVersion\Explorere\FileExts\.mov\OpenWithProgids" /v WMP11.AssocFile.MOV /t REG_NONE /d 0000 /f

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• Settings what-opens-what once and for all (Backing up File Associations)

  - by ldigas

  Every time I switch machines (as in, get a new one, or reinstall an OS or something like that) my precious file associations get lost. And the next six months pass slowly until I again set them up right. Is there a program that allows me to: Set all the extensions I would like to open with let's say, Vim, without setting each one of them individually. Something of a kind: Vim opens: .... list of extensions ... and/or A program which lets me backup my current settings, and when I copy those to a new machine it lets me just modify the paths where I putted the applications in question, and it does the rest (again, associates that program with all the extensions it opened before).

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• Why it's important to specify the complete class name in your association when using namespaces

  - by Carmine Paolino

  In my Rails application there is a model that has some has_one associations (this is a fabricated example): class Person::Admin < ActiveRecord::Base has_one :person_monthly_revenue has_one :dude_monthly_niceness accepts_nested_attributes_for :person_monthly_revenue, :dude_monthly_niceness end class Person::MonthlyRevenue < ActiveRecord::Base belongs_to :person_admin end class Dude::MonthlyNiceness < ActiveRecord::Base belongs_to :person_admin end The application talks to a backend that computes some data and returns a piece of JSON like this: { "dude_monthly_niceness": { "february": 1.1153232569518972, "october": 1.1250217200558268, "march": 1.3965786869658541, "august": 1.6293418014601631, "september": 1.4062771500697835, "may": 1.7166279693955291, "january": 1.0086401628086725, "june": 1.5711510228365859, "april": 1.5614525597326563, "december": 0.99894169970474289, "july": 1.7263264324994585, "november": 0.95044938418509506 }, "person_monthly_revenue": { "february": 10.585596551505297, "october": 10.574823016656749, "march": 9.9125274764852787, "august": 9.2111604702328922, "september": 9.7905249446675153, "may": 9.1329712474607962, "january": 10.479614016604238, "june": 9.3710235926961936, "april": 9.5897372624830304, "december": 10.052587677671438, "july": 8.9508877843925561, "november": 10.925339756096172 }, } To deserialize it, I use ActiveRecord's from_json, but instead of a Person::Admin object with all the associations in place, I get this error: >> Person::Admin.new.from_json(json) NameError: uninitialized constant Person::Admin::DudeMonthlyNiceness Am I doing something wrong? Is there a better way to deserialize data? (I can modify the backend easily) UPDATE: the original title was "How to deserialize from json to ActiveRecord objects with associations?" but it ended up being my mistake in specifying associations so I changed the title.

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• Rails: associate model with two of its kind

  - by Patrick Oscity

  hi all, im trying to do this: class Event < ActiveRecord::Base belongs_to :previous_event has_one :event, :as => :previous_event, :foreign_key => "previous_event_id" belongs_to :next_event has_one :event, :as => :next_event, :foreign_key => "next_event_id" end because i want to enable the user to repeat events and change multiple oncoming events at the same time. what am i doing wrong, or is there another way of doing this? somehow i need to know about the previous and the next event, don't i? when i'm testing this in the consolewith Event.all[1].previous_event, i get the following error: NameError: uninitialized constant Event::PreviousEvent from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:105:in `const_missing' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2199:in `compute_type' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2195:in `compute_type' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:156:in `send' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:156:in `klass' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations/belongs_to_association.rb:49:in `find_target' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations/association_proxy.rb:239:in `load_target' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations/association_proxy.rb:112:in `reload' from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations.rb:1250:in `previous_event' from (irb):2 what is going wrong here? thanks a ton for your help.

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• Bidirectional one-to-many associations with indexed collections in NHibernate

  - by Jørn Schou-Rode

  Last summer, I asked a question regarding how to add new object to an IList mapped as a one-to-many with NHibernate. One of the answers let me to this paragraph in the documentation: Please note that NHibernate does not support bidirectional one-to-many associations with an indexed collection (list, map or array) as the "many" end, you have to use a set or bag mapping. While I am pretty sure I understand what this paragraph says, I have no idea why or how to work around this limitation. As I am now again working with a model that seems to require a "bidirectional one-to-many association with an index collection", I figured the time was right for follow-up questions: Why does NHibernate have this limitation on associations? It is my impression that the guys behind NHibernate are quite clever, so I assume there is a pretty good reason. What are the common workarounds for this shortcoming? Making the collection a non-indexed bag and adding an explicit Position property to the child class? Any better solutions?

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• Rails can't render polymorphic associations to XML?

  - by ambertch

  When I render XML with an :include clause for a polymorphic association I have, it doesn't work. I end up with the XML returning the object pointers instead of the actual objects, like: <posts> #<Comment:0x102ed1540>#<Comment:0x102ecaa38>#<Comment:0x102ec7fe0>#<Comment:0x102ec3cd8> </posts> Yet as_json works! When I render JSON with :include clause, the associations are rendered correctly and I get something like: posts":[ {"type":"Comment","created_at":"2010-04-20T23:02:30-07:00","id":7,"content":"fourth comment"}, {"type":"Comment","created_at":"2010-04-20T23:02:26-07:00","id":6,"content":"third comment"}] My current workaround is using XML builder, but I'm not too comfortable with that in the long run. Does anyone happen to know about this issue? I'm kind of in a catch-22 because while XML doesn't render the associations, as_json doesn't render in a kosher json format (returns an array rather than a list of hashes as proper json should) and the deserializer I'm using on the client side would require modification to parse the json correctly.

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• Many Associations Leading to Slow Query

  - by Joey Cadle

  I currently have a database that has a lot of many to many associations. I have services which have many variations which have many staff who can perform the variation who then have details on themselves like name, role, etc... At 10 services with 3 variations each and up to 4 out of 20 staff attached to each service even doing something as getting all variations and the staff associated with them takes 4s. Is there a way I can reduce these queries that take a while to process? I've cut down the queries by doing eager loading in my DBM to reduce the problems that arise from 1+N issues, but still 4s is a long query for just a testing stage. Is there a structure out there that would help make such nested many to many associations much quicker to select? Maybe combining everything past the service level into a single table with a 'TYPE' column ?? I'm just not knowledgable enough to know the solution that turns this 4s query into a 300MS query... Any suggestions would be helpful.

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• Rails associations of user/post/comment

  - by garthcn

  Hi, I'm trying to create an app like a blog, with 3 models: user, post and comment. As expected, a comment belongs to both a user and a post. I used the following associations: User.rb has_many :comments has_many :posts Post.rb has_many :comments belongs_to :user Comment.rb belongs_to :user belongs_to :post And I tried to create comments using: @user.comments.create However, this will relate the comment with user, but not with post. I want the comment to be associated wit BOTH user and post. Is there a way to do so? Or did I use the wrong associations? I think it might be a bad practice to set the user_id or post_id by hand, so both ids are not in attr_accessible. I'm not sure if it is correct. Thank you!

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• Rails HABTM Scoping to current subdomain

  - by Rabbott

  I have the following associations: class User < ActiveRecord::Base has_and_belongs_to_many :brands, :join_table => 'brands_users' has_and_belongs_to_many :companies, :join_table => 'companies_users' end class Brand < ActiveRecord::Base belongs_to :company has_and_belongs_to_many :users, :join_table => 'brands_users' end class Company < ActiveRecord::Base has_and_belongs_to_many :users, :join_table => 'companies_users' has_many :brands, :order => :name end While editing a user I am using the checkbox list of brands. So that I can assign users 'access' to brands, the brands that show up are only the brands that belong to the current company (defined by the subdomain [using subdomain_fu]). The problem I am running into is that when using the default HABTM functionality and the checkbox list, upon save, Rails removes ALL user-brand associations, then re-adds just the ones for the form I just submitted.. How do I scope that to only remove associations of brands who belong to the current company, defined in the subdomain?

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• Sync LINQ-to-SQL DBML schema with SQL Server database

  - by Maxim Z.

  After creating a SQL Server 2008 database, I made a Linq-to-SQL schema in Visual Studio. Next, in the .dbml visual editor (in Visual Studio), I added PK-to-FK and PK-to-PK associations to the schema. How do I copy those associations that I created in Visual Studio over to the database? In other words, how do I sync with the DB?

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• RAILS: How to get has_many associations of a model

  - by Pioz

  Hi, how I can get the has_many associations of a model? For example if I have this class: class A < ActiveRecord::Base has_many B has_many C end I would a method like this: A.get_has_many that return [B,C] Is it possible? Thanks!

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• LINQ: Create persistable Associations in Code, Without Foreign Key

  - by Alex

  Hello, I know that I can create LINQ Associations without a Foreign Key. The problem is, I've been doing this by adding the [Association] attribute in the DBML file (same as through the designer), which will get erased again after I refresh my database (and reload the entire table structure). I know that there is the MyData.cs file (as part of the DBML) in which I can place my partial extensions etc. to domain objects (to persist even after I refresh the DBML), but I don't know how to create an association there?

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• Checking ActiveRecord Associations in RSpec.

  - by alokswain

  I am learning how to write test cases using Rspec. I have a simple Post Comments Scaffold where a Post can have many Comments. I am testing this using Rspec. How should i go about checking for Post :has_many :comments. Should I stub Post.comments method and then check this with by returning a mock object of array of comment objects? Is testing for AR associations really required ?

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• RoR - Associations into practise - forms (View)

  - by NicoJuicy

  I'm learning Ruby on Rails. I'm using some associations (has_many :through, ...) But i'm having some problems with it when i'm combining my views. How exactly do i combine these nested forms? Can i do this with partial forms and where do i have to write extra code for this? I have seen examples only use the "view" and others also edit the controller.... An example would be very nice :-)

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• Using Joins vs Entity associations

  - by shivesh

  I am learning Entity framework and linq-to-entities. It's possible to get cross values from multiple tables using JOINS (join keyword) or using the navigation fields ( associations) in which case the framework knows how to reference the cross data. My question is what to use when?

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• Ruby on Rails - Primary and Foreign key

  - by Eef

  Hey, I am creating a site in Ruby on Rails, I have two models a User model and a Transaction model. These models both belong to an account so they both have a field called account_id I am trying to setup a association between them like so: class User < ActiveRecord::Base belongs_to :account has_many :transactions end class Transaction < ActiveRecord::Base belongs_to :account belongs_to :user end I am using these associations like so: user = User.find(1) transactions = user.transactions At the moment the application is trying to find the transactions with the user_id, here is the SQL it generates: Mysql::Error: Unknown column 'transactions.user_id' in 'where clause': SELECT * FROM `transactions` WHERE (`transactions`.user_id = 1) This is incorrect as I would like the find the transactions via the account_id, I have tried setting the associations like so: class User < ActiveRecord::Base belongs_to :account has_many :transactions, :primary_key => :account_id, :class_name => "Transaction" end class Transaction < ActiveRecord::Base belongs_to :account belongs_to :user, :foreign_key => :account_id, :class_name => "User" end This almost achieves what I am looking to do and generates the following SQL: Mysql::Error: Unknown column 'transactions.user_id' in 'where clause': SELECT * FROM `transactions` WHERE (`transactions`.user_id = 104) The number 104 is the correct account_id but it is still trying to query the transaction table for a user_id field. Could someone give me some advice on how I setup the associations to query the transaction table for the account_id instead of the user_id resulting in a SQL query like so: SELECT * FROM `transactions` WHERE (`transactions`.account_id = 104) Cheers Eef

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• extension-base file associations

  - by Maurice Perry

  Hi there, I am using ubuntu 9.10, and I would like to associate thunderbird to all the files with the extension .eml. The problem is that is seems that ubuntu is attributing the mime type text/plain to these files, based on their content, which meens that if I set thunderbird as the default application for .eml files, all the other text files (.txt for instance) will be opened with thunderbird. Is it possible to add a rule to impose a mime type based on the file extension, regardless of its content?

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• Changing file extension associations

  - by ldigas

  What is the easiest way to permanently change association (program which opens etc.) for several file extensions at once? What I mean? Let's say you used TextEditorUncool up until now to open txt, dat, bat and abc files. Now you got TextEditorReallyCool and you wish if there was an application which on the left had a name of the program, and on the right a list of file extensions associated with it (which it, let's say, opens). Is there such a thing? Usually programs change this thing during installation (some even ask before), but in the case of portable programs one usually has to do it by hand, and for editors which open a gazillion of different file extensions, it gets tiresome really fast. All ideas welcomed !

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• File associations in windows 8

  - by soandos

  When I set a program to open a specific file type by default, it works (like Word 2013 for PDFs). However, when I change the default back to reader, I lose Word as an option that I can pick in the open with sub-menu. How can I get it to stick? Update: It seems that there is something special about word. Adding Notepad++ as the default and then changing it back seems to keep notepad++ on the sub-menu. Word version is 2013

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• Why are certain default application associations "locked"?

  - by H.B.

  Edit: As i now have three answers that do not answer the question: This question is not about getting the association to work again. I do not like fighting symptoms, i prefer cures. After associating my MP3 files with MPlayer using the Open with/Choose default program... dialogue i can no longer change that association using said dialogue, the Always use this [...] Checkbox is henceforth always greyed out (Control Panel > Default Programs > Associate a file type or protocol with a program does not let me change it either, it seems to just use the same dialogue anyway). That also happened for MP4s but not for MKVs for example, and if i associate my MP3s with other applications like VLC it does not get blocked. I would really like to know why that is and if i can avoid this beforehand (thankfully i know ways to fix it afterwards already). Edit: Another obervation: The blocking programs (i managed to block it with an association to Visual Studio as well) do not appear in the Recommended Programs of the open-with-dialogue (And the explorer said: "The current program is not recommended, but i won't let you change it, ha!"). Edit: A screenshot as requested: As you can see on the top left (if you know the icon of MPlayer), the file is currently associated with MPlayer. Edit: Ways to fix it (Note: This question is not about fixing it) Using the Default Programs Control Panel > Default Programs > Set Default Programs, select WMP, Choose defaults for this program, check .mp3 This should reassociate the files with WMP and you can create a new association in the explorer. Using the registry (As always, keep your hands off it unless you know what you are doing or if you are fine with accidentally breaking your system) HKEY_CURRENT_USER > Software > Microsoft > Windows > CurrentVersion > Explorer > FileExts > .mp3 Here you could for example clean up the open-with-list, and the current default program seems to be saved here as well in the key UserChoice, there you can change the ProgId string to another application, you can associate it with WMP by entering WMP11.AssocFile.MP3 or just pick another application right away. You may need to mess with permissions on the key though, if you cannot change the ProgId value.

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• File associations not present in Microsoft Office 2010

  - by Babs Carter

  The error when trying to open MS Office is that there is no file association & another error when trying to open individual progs is - side bt side configuration is incorrect. The suite has been working perfectly until last week ( no significant changes to system ) I have tried downloading the VC++ & uninstalled & reinstalled twice, even deleted the registry entry for office 2010 before reinstall but have had no success. Any help would be greatly appreciated!

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• read/write_attribure on associations

  - by artemave

  read/write_attribute is a great way to enhance default accessors generated by ActiveRecord. Like this for example: def price read_attribute(:price) or "This item is priceless and you are by the way #{User.current.login}" end The same however does not seem to be working with associations. Demonstration: class Product < ActiveRecord::Base has_and_belongs_to_many :stores end Then >> a = Product.first => #<Product id: 1, name: "awesome product", created_at: "2010-05-07 12:11:00", updated_at: "2010-05-07 12:11:00"> >> a.stores => [#<Store id: 1, name: "ikea", created_at: "2010-05-07 12:11:28", updated_at: "2010-05-07 12:11:28">] >> a.read_attribute(:stores) => nil >> So, is there some sort of read/write_association? Or, if not, is there a reason not to have one?

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• accessing associations within GORM Events

  - by Don

  Hi, My Grails app has a User class and a Role class. The User class has an authorities property which holds the roles assigned to that user, e.g. class User { static hasMany = [authorities: Role] // This method is called automatically after a user is inserted def afterInsert() { this.authorities.size() } } If I create a user and assign them a role, a NullPointerException is thrown from the GORM event method afterInsert(), because authorities is null. If I comment out afterInsert() the user is saved correctly along with the assigned role. Is there some reason why I can't access associations from GORM event methods. Is is possible that this event is fired after the User row is inserted, but before the row is added to the User-Role join table? Thanks, Don

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• CakePHP Bake association problem

  - by Apu

  I have only two tables in my database with a one-to-many relationship between them (user hasMany messages) and am trying to get basic CRUD functionality going. Bake detects the associations correctly and specifies them correctly inside the model classes, but in controllers and views it looks like Cake doesn't know anything about those associations -- I don't even get a select tag for user_id when I go add a new message. Has anyone come across this problem before? What can I be doing wrong? Table structure appears to be fine: CREATE TABLE users ( id int(11) NOT NULL AUTO_INCREMENT, username varchar(255) NOT NULL, `password` varchar(255) NOT NULL, email varchar(255) NOT NULL, created datetime NOT NULL, modified datetime NOT NULL, PRIMARY KEY (id) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; CREATE TABLE IF NOT EXISTS `messages` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `content` varchar(255) NOT NULL, `created` datetime NOT NULL, `modified` datetime NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

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