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  • Modeling a cellphone bill: should I use single-table inheritance or polymorphic associations?

    - by Horace Loeb
    In my domain: Users have many Bills Bills have many BillItems (and therefore Users have many BillItems through Bills) Every BillItem is one of: Call SMS (text message) MMS (multimedia message) Data Here are the properties of each individual BillItem (some are common): My question is whether I should model this arrangement with single-table inheritance (i.e., one "bill_items" table with a "type" column) or polymorphism (separate tables for each BillItem type), and why.

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  • converting Date object to TimeWithZone

    - by avaynshtok
    I need to convert a Date object into a TimeWithZone object representing the beginning of that day in a given time zone. The following approach works, but seems too convoluted as it requires me to convert the date to a string: ?> date = Date.parse("2010-02-17") => Wed, 17 Feb 2010 >> ActiveSupport::TimeZone['Eastern Time (US & Canada)'].parse(date.to_s) => Wed, 17 Feb 2010 00:00:00 EST -05:00 >> ActiveSupport::TimeZone['UTC'].parse(date.to_s) => Wed, 17 Feb 2010 00:00:00 UTC 00:00 Is there a better way I'm missing?

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  • How can I make named_scope in Rails return one value instead of an array?

    - by sameera207
    I want to write a [named scope] to get a record from its id. For example, I have a model called Event, and I want to simulate Event.find(id) with use of named_scope for future flexibility. I used this code in my model: named_scope :from_id, lambda { |id| {:conditions => ['id= ?', id] } } and I call it from my controller like Event.from_id(id). But my problem is that it returns an array of Event objects instead of just one object. Thus if I want to get event name, I have to write event = Event.from_id(id) event[0].name while what I want is event = Event.from_id(id) event.name Am I doing something wrong here?

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  • mysql query query

    - by nightcoder1
    basically i need to write a query for mysql, but i have no experience in this and i cant find good tutorials on the old tinternet. i have a table called rels with columns "hosd_id" "linkedhost_id" "text link" and a table called hostlist with columns "id" "hostname" all i am trying to achieve is a query which outputs the "hostname" and "linked_id" when "host_id" is equal to "id" any help or pointers on syntax or code would be helpfull, or even a good mysql query guide

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  • Nested resources in namespace form_for

    - by Nelson LaQuet
    Problem The form_for helper incorrectly determines the path to my nested resource inside of a namespace. The models in question are: Forum::Thread and Forum::Reply respectively, located in a subfolder called "forum" under my models directory. This is in Rails 3 BETA 3. routes.rb namespace :forum do root :to => 'threads#index' resources :threads do resources :replies end end app/views/forum/replies/_form.html.haml ... - form_for [@thread, @reply] do |f| ... app/controllers/forum/replies_controller.rb ... def new @reply = Forum::Reply.new end ... Error undefined method `forum_thread_forum_replies_path' In reference to the line outlined above in _form.html.haml

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  • Migrate existing ROR app to GAE

    - by zengr
    I have managed to run a basic rails app1 on App Engine using: http://gist.github.com/268192 So, on my basic app2, I install CE, which works fine on local machine. (communityengine.org) But, when I follow the same steps on my actual app2, where community_engine plugin is installed and all the gems are frozen, the app engine installer script asks for to over write various files like boot.rb, routes.rb, which I don't allow. So, as expected, when I publish the rails + ce app to GAE, it's not published and it also screws the local installation of CE on app2. So, the problem is obvious, CE uses ActiveRecord, and GAE uses DataMapper. So, my question can also be rephrased as: Can we migrate an existing ROR App using Active Record to GAE which uses DataMapper? PS: This is my first project on ROR and GAE.

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  • Books for experienced .NET developer learning PHP/MySQL

    - by webworm
    Hi All, I am an experienced .NET developer (C#/ASP.NET) looking to broaden my skills to the PHP/MySQL arena. I would like get recommendations on books for learning PHP/MySQL that are geared towards someone who is already familiar with object oriented programming and web development. I do realize that there are lots of online material out there but I am looking for an actual print book I can read. Thanks a bunch.

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  • [Rails] Calling a method from a view using link_to_function

    - by Jeff
    Hello! I'm trying to have an image that when clicked associates the selected guideline to a project. I'm using link_to_function which somewhat behaves but I can not get the method I am calling in the link_to_function to redirect to another page. Is there a better way to do this? Below is a bit of my code. I can paste in additional parts if necessary: <% @guidelines.each do |guideline| %> <tr> <td align='center'><%= link_to_function image_tag("../../../images/icons/action_add.png"), add_guideline(guideline) %></td> <td><%=h guideline.title %></td> My GuidelinesController.helper method looks like this: def add_guideline(guideline) @project = Project.find(params[:project_id]) @project.guidelines << guideline @project.save redirect_to dashboard_path #doesn't work :( end

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  • How can I serialize and communicate ActiveRecord instances across identical Rails apps?

    - by Blaine LaFreniere
    The main idea is that I have several worker instances of a Rails app, and then a main aggregate I want to do something like this with the following pseudo pseudo-code posts = Post.all.to_json( :include => { :comments => { :include => :blah } }) # send data to another, identical, exactly the same Rails app # ... # Fast forward to the separate but identical Rails app: # ... # remote_posts is the posts results from the first Rails app posts = JSON.parse(remote_posts) posts.each do |post| p = Post.new p = post p.save end I'm shying away from Active Resource because I have thousands of records to create, which would mean thousands of requests for each record. Unless there is a way to do it all in one request with Active Resource that is simple, I'd like to avoid it. Format doesn't matter. Whatever makes it convenient. The IDs don't need to be sent, because the other app will just be creating records and assigning new IDs in the "aggregate" system. The hierarchy would need to be preserved (E.g. "Hey other Rails app, I have genres, and each genre has an artist, and each artist has an album, and each album has songs" etc.)

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  • Passing two variables to separate table...associations problem

    - by bgadoci
    I have developed an application and I seem to be having some problems with my associations. I have the following: class User < ActiveRecord::Base acts_as_authentic has_many :questions, :dependent => :destroy has_many :sites , :dependent => :destroy end Questions class Question < ActiveRecord::Base has_many :sites, :dependent => :destroy has_many :notes, :through => :sites belongs_to :user end Sites (think of this as answers to questions) class Site < ActiveRecord::Base acts_as_voteable :vote_counter => true belongs_to :question belongs_to :user has_many :notes, :dependent => :destroy has_many :likes, :dependent => :destroy has_attached_file :photo, :styles => { :small => "250x250>" } validates_presence_of :name, :description end When a Site (answer) is created I am successfully passing the question_id to the Sites table but I can't figure out how to also pass the user_id. Here is my SitesController#create def create @question = Question.find(params[:question_id]) @site = @question.sites.create!(params[:site]) respond_to do |format| format.html { redirect_to(@question) } format.js end end

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  • newbie question: how to show a drop down menu with this function

    - by Mellon
    My model object (e.g. MyObject) has one property (e.g. color), the "color" property holds a string value which comes from a list of string (e.g. colors=['red','yellow', 'black']). now, I have one instance of myObject get from database and show on the view page in a row, I need to show the 'color' property of myObject in a drop down menu with the current value as the default selected. How to implement this in Rails 3 in my view page. (Later, when user select from the dropdown menu, the object will be updated in DB based on user's selection) Please explain with instance "myObject" and list "colors=[...]"

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  • Typo blogging platform with Heroku hosting: theming

    - by Jack
    Does anyone know how to workarounds Heroku's limitations on writing to the theme files for the Typo blogging platform? I'd like to take advantage of the theming capabilities right from the browser. If any theme's stylesheet is changed I get the error message "Unable to write file" in addition to the fact that any theme being changed to one that is not the default causes the page to lose all styling and is displayed in plain text. I followed this (awesome) blog entry to get it up and working.

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  • Using a helper method in a mailer that is defined in a controller

    - by Horace Loeb
    The helper method current_user is defined and made available as a helper in ApplicationController like this: class ApplicationController < ActionController::Base helper_method :current_user def current_user return @current_user if defined?(@current_user) @current_user = current_user_session && current_user_session.record end end My question is how I can use the current_user helper method in a mailer template (obviously it will always return nil, but I'm trying to render a partial that depends on it). Normally when I want to use helpers in a mailer, I do something like add_template_helper(SongsHelper), but since the helper is defined in a class instead of a module I'm not sure what to do

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  • MYSQL - datetime to seconds

    - by Mike
    Hello, I wasn't able to find out (googling, reading mysql reference manual) how to get value of DATETIME in seconds in MySQL. I dont mean to extract seconds from datetime, but to convert it into seconds. Thanx

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  • question regarding rails framework code

    - by Joseph Misiti
    I noticed that the code in the rails framework is using the following convention all over the place: class SomeClass class << self def some function end end end rather than class SomeClass end def SomeClass.function end and class SomeClass def self.somefunction end end What is the reason for this design choice? They all seem to accomplish them same thing

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  • Advanced Rails Routing of short URL's and usernames off of root url

    - by Michael Waxman
    I want to have username URL's and Base 58 short URL's to resources both off of the root url like this: http://mydomain.com/username #=> goes to given user http://mydomain.com/a3x9 #=> goes to given story I am aware of the possibilities of a user names conflicting with short urls, and I have a workaround, but what I can't figure out is the best way to set this up in rails. Can I do it in rails routes? Should I do something with a piece of Rack middleware? Should I set up a routing controller? Please let me know the best way to do this. Thanks so much!

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  • resource_controller get rid of setting flash notice?

    - by goodwill
    I am talking about rails resource_controller gem plugin here: Basically when I am doing json format, I would like to completely suppress the flash notice if possible, trying to call flash "" will fail, while calling flash[:notice]="" doesn't look really nice either. Is there some better approach?

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  • Error when running bundler install

    - by lmumar
    Hi all, I tried running bundle install in our production server, but I encounter this problem: Updating git://github.com/collectiveidea/delayed_job.git fatal: Refusing to fetch into current branch refs/heads/master of non-bare repository An error has occurred in git. Cannot complete bundling. I have bundler version 0.9.25 installed. Thanks

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  • MySQL InnoDB insertion is very slow

    - by dharmapurikar
    We use MySQL server 5.1.43 64-bit edition. InnoDB is used as engine. We have a sql script which we execute every time we build the application. On ubuntu machine with MySQL server and InnoDB engine it takes about 55 seconds to complete the execution. If I run the same script on OSX, it takes close to 3 minutes! Any ideas why OSX is so slow while executing this script?

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  • HTTP Push on Heroku

    - by huntaub
    What would be the best approach to creating an application on Heroku that has the capability to push data to the client? I have looked at Juggernaut; however, it requires Flash and I am not sure about it actually running on Heroku. Any help would be appreciated.

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  • Log MySQL Query In Kohana 3

    - by Asif
    Hi All, I am using Kohana 3. I want to log the MySQL queries being executed by an application. The reason to determine the query of type INSERT,UPDATE and DELETE which are being executed in a process and store them in another MySQL table with date-time for further reference. Can anybody tell how can I achieve this?

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