ruby-on-rails-3.1

问题 How can I specify after which field I want to add a new column? (I don't want the field added in at the bottom after the timestamps) add_column :users, :is_active, :boolean 回答1: Here is how: add_column :users, :is_active, :boolean, :after => :some_column where :some_column is the name of the column you want to add :is_active after. 回答2: In general, you can't and you shouldn't care. Tables in relational databases don't really have any particular order; that's why you should always specify the

问题 I am using Ruby 1.8.7 with Rails 3.1. My application worked fine in Rails 3.0 but when I bumped it up to Rails 3.1.4, all my url helpers broke! After Googling like a mad man the past 2 days, I have given up and the time has come to seek help. I don't believe the problem is with my routes.rb file but something more on the view/helper side. I have the following in my routes.rb: resources :sessions In my homepage view I have the following link_to, which errors out: <%= link_to "Login", new

问题 Since upgrading to Rails 3.1, I've been having a problem with my site's routing. Previously, with Rails 3.0, I was able to do this in my router config: resources :quotes, :path => "" root :to => "quotes#index" That would give me routes like GET /(.:format) and such, which is what I want since the index action of my QuotesController can also return data in JSON, XML and ATOM. Now, since upgrading to Rails 3.1, the routes have been showing up like this: GET / . The (.:format) is gone, and

问题 From the Github page it would seem that one can use the Sass helpers ( asset_path , asset_url , image_path etc.) in Ruby but I can't figure out how. I need to set the default_url for a Paperclip attachment and want to use one of my assets from the asset pipeline for that. 回答1: You can use the sass helpers in SCSS files, but you cannot use them elsewhere. In those cases you need to use the regular asset_path and image_tag helpers. 来源： https://stackoverflow.com/questions/7636204/how-to-use-sass

问题 This is my route: scope ":username" do resources :feedbacks end When I do rake routes , I get this: feedbacks GET /:username/feedbacks(.:format) {:action=>"index", :controller=>"feedbacks"} POST /:username/feedbacks(.:format) {:action=>"create", :controller=>"feedbacks"} new_feedback GET /:username/feedbacks/new(.:format) {:action=>"new", :controller=>"feedbacks"} edit_feedback GET /:username/feedbacks/:id/edit(.:format) {:action=>"edit", :controller=>"feedbacks"} feedback GET /:username

问题 I have a Meal model that has_many :foods, :through => :servings . Meal also: accepts_nested_attributes_for :servings, :allow_destroy => true validates_associated :servings The Serving model has a field called serving_amount and a field called amount_recorded . In the Serving model, I currently use this validation: validates :serving_size, :numericality => {:greater_than => 0}, :if => :amount_recorded? The message returned if the validation fails is terrible. This is compounded by the fact

问题 When I use autocompleted search form in some pages it is working but for when I click the "Home", "Help" or "Users" links on navbar, I can only use search form without autocompleted feature. layouts/header.html.erb <% if logged_in? %> <%= form_tag users_path, class: "navbar-form navbar-left", method: :get do %> <% if params[:query].present? %> <%= link_to "clear", users_path%> <%end%> <div class="input-group input-group-md"> <%= text_field_tag :query, params[:query], class: "form-control",id:

问题 I have put fancybox (jquery plugin ) inside the assets/javascripts/includes/jquery.fancybox-1.3.4 Before this location i also tried to put it under /vendor/assets/stylesheets/jquery directory. I am getting this weird error & why isn't rails able to get the particular file when its right there. ------------- Development Log ---------------- Started GET "/vendor/assets/stylesheets/jquery.fancybox-1.3.4/fancybox/jquery.fancybox-1.3.4.pack.js" for 127.0.0.1 at 2011-11-25 13:30:42 -0800

问题 The rails 3.2 app needs RMagick gem. From the support ticket, they say its in private PaaS. But what for apps hosted on cloudfoundry.com itself, not in private PaaS? 回答1: CloudFoundry.com recently added the ImageMagick binaries, which are necessary for libraries such as RMagick to work. The path is /var/vcap/packages/imagemagick/bin/ . For example, to configure the paperclip gem add the following to config/environments/production.rb : Paperclip.options[:command_path] = "/var/vcap/packages

问题 I have an existing mysql database set up, and would like to set up a new rails up simply so my client can view and edit the records in the db. How can I set up a scaffold linked to my existing db. The db name is "Products" and has just one table called "pins". Pins tables: +----------------+---------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+---------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI