ruby-on-rails-3

问题 I'm trying to create a multi-page form that uses multiple models. I have an applicant and this applicant has more than one address (one to many relationship). I would like the first page to contain information about the applicant, and then the page after that to have the form for the address(es) This is what I have at the moment: applicant.rb has_many :addresses, :dependent => :destroy accepts_nested_attributes_for :addresses address.rb belongs_to :applicant applicants_controller.rb: def new

问题 Ok so i have this data structure class User < ActiveRecord::Base has_many :companies, :through => :positions has_many :positions class Company < ActiveRecord::Base has_many :positions has_many :users, :through => :positions class Position < ActiveRecord::Base belongs_to :company belongs_to :user attr_accessible :company_id, :user_id, :regular_user end And my database structure create_table "positions", :force => true do |t| t.integer "company_id" t.integer "user_id" t.datetime "created_at",

问题 When I try to seed my application I get the error: No connection could be made because the - target machine actively refused it. - connect(2) I believe the reason why is because I was having issues with mysql2 so I uninstalled it along with the MySQL 5.5 Servers and then switched to sqlite3. I think the server for mysql2 is running in the background so this could be the issue. How would I fix this? How would I turn off the Mysql2 local host server or whichever server it is that's causing this

问题 how do I use facebox in a Rails app knowing that I already have the jquery-rails gem installed? Need sample code that goes into the view as well. Thanks. 回答1: Include facebox library in your application.html.erb file. Add this code in a javascript file. jQuery(document).ready(function($) { $('a[rel*=facebox]').facebox() }) View <a href="images/stairs.jpg" rel="facebox">text</a> There are a few simple examples and some documentation on their site https://github.com/defunkt/facebox#usage. 来源：

问题 I have setup my versioned API like this with only a small tweak for backwards compatibility. In my routes I have: scope '(api(/:version))', :module => :api, :version => /v\d+?/ do … scope '(categories/:category_id)', :category_id => /\d+/ do … resources :sounds … end end with the successful goal already reached of having the following URL's reach the same place /api/v1/categories/1/sounds/2 /api/categories/1/sounds/2 /categories/1/sounds/2 /sounds/2 My directory structure is like this: The

问题 I have a form for import data like this: <%= form_tag({ controller: 'courses', action: :import }, multipart: true) do %> <%= label_tag 'file', 'Import data' %> <%= file_field_tag 'file' %> <%= submit_tag "Import", name: nil, class: 'btn' %> <% end %> This is my import action: def import require 'csv' csv_text = File.read(params[:file].tempfile.to_path.to_s) csv = CSV.parse(csv_text, headers: true ) csv.each do |row| row = row.to_hash.with_indifferent_access Course.create(row.to_hash.symbolize

问题 I'm using ActiveAdmin. I have a list of Shipments with status (as a string) of Open and Closed. When the user clicks on the Shipments tab, I want to display only the Open shipments. How can I do that? Of course, the user could later choose to see the Closed shipments by using the filter. But I want the default to initially only show the Open shipments. 回答1: Probably best way will be to create scopes in model. AA automatically gets your scopes and creates tabs above table in index view.

问题 In Rails 3 how do I sort an array of strings with special characters. I have: [Água, Electricidade, Telefone, Internet, Televisão, Gás, Renda] However when i invoke sort over the array Água gets sent to the end of the array. 回答1: The approach I used when I ran into the same issue (depends on iconv gem): require 'iconv' def sort_alphabetical(words) # caching and api-wrapper transliterations = {} transliterate = lambda do |w| transliterations[w] ||= Iconv.iconv('ascii//ignore//translit', 'utf-8

问题 I have 2 models Category - id - name and Transaction - id - category_id - amount I want to find the sum of all transactions for each category. I know I can get a list of caterogies and then get the sum for all the transactions with the category_id but it will do 20+ queries. Is there a way to do it all in one query? Edit: I want to end up with a list of [[category1, sum], [category2, sum]]. 回答1: Transaction.group(:category_id).sum(:amount) This will return a hash similar to this: {CATEGORY_ID

问题 I've got the following code in my controller: @items = Item.where(:user_id => 1).order("updated_at DESC").limit(2) @oldest_item = @items.last For some reason, and I'm guessing this has to do with my recent upgrade to Rails 3, @oldest_item is not being set to the last item in @items, but is instead being set to the last item that matches Item.where(:user_id => 1).order("updated_at DESC") . So imagine there are 3 items that match, A, B, and C. @items is being set to [A, B], and then @oldest