ruby-on-rails-3

问题 I'm trying to translate an app into Japanese and everything was going smoothly until I put it into production. As cache_classes is now true any translation within a model reverts to the default locale. I know I'm probably supposed to target the translations directly in the yml file but I'm not sure how I would do that for the following simplified code: class TimeseriesForecast < ActiveRecord::Base @@field_names = { :location_name => I18n.t('forecast_timeseries.location_name'), :local_date

问题 Following Hartl's RailTutorial for Rails(3.2). I keep getting this error message or oddly a "The connection was reset" message: ActiveRecord::RecordNotFound in UsersController#show Couldn't find User without an ID I'm trying to log in and after successfully logging in, I want the application to redirect the user to user/show.html.erb. I believe that I'm passing the :id parameter in the show method in the users controller. Any tip/help would be appreciated! I've pasted some relevant files

问题 How is the best way to load Category model, for ProductController in new, edit update and create actions Product has categories collection class Product < ActiveRecord::Base has_many :categories end Always for new, edit, create and update actions, I need to load the categories collection to populate a check_box_tag list The "baby steps" for this situation is: class Admin::ProductsController < Admin::AdminApplicationController def new @product = Product.new @categories = Category.all end def

问题 I m using Rails 3.2.1 . how to use link_to with remote=>true My Method in Controller def clickme @clk = "you click me" respond_to do |format| format.js { render :layout=>false } end end My View In my new.html.erb file <%= link_to "click here", {:action=>"clickme"}, {:remote => true, :id=>"clk"} %> <div id="allclick"> <%= render :partial => 'goclick' %> </div> _goclick.html.erb <%= @clk %> clickme.js.erb $("allclick").update("<%= escape_javascript(render(:partial => "goclick")) %>"); On my web

问题 Here is the parent question: save string to file I want to pass the parameter which will be saved in file(.csv) after clicking button. @bigtable is a table with strings in each row. Here is the code in my show.html.erb: ...some code here... <%= form_tag do %> <% text_field_tag, id = "bigtable", value = @bigtable.to_s %> <%= submit_tag 'Zapisz' %> <% end %> and my controller method: def savefile @bigtable = param[:bigtable] @bigtable.join("\n") File.open("path/to/file", "w") { |file| file

问题 I have a table with several hundred records, each one containing a datetime column. What is the most efficient way to find the distinct years from that datetime field? 回答1: Using Ruby (this would require loading all the records, though): Model.select("my_datetime").map{ |item| item.my_datetime.year }.uniq Using SQL (this example is for PostgreSQL, I can update it with your specific database): # PostgreSQL Model.select("distinct(extract(year from my_datetime))") # MySQL Model.select("distinct

问题 I need to create an admin role using devise for my app. I've created basic authentication using devise . I have a devise user model in my app but now i need an admin who can show edit and destroy all the users. I tried following the tutorials but none of them helped. I am using rails 3.0.10 and ruby 1.9.2-p290. 回答1: You just define role.rb first by creating migratioin rails g model role name:string then in role.rb class Role has_one:user end And in user model class user belongs_to :role end

问题 On Rails 3, I'm trying to redirect from a URL without a trailing slash to the canonical URL that has a slash. match "/test", :to => redirect("/test/") However, the route above matches both /test and /test/ causing a redirect loop. How do I make it match only the version without the slash? 回答1: You can force the redirect at the controller level. # File: app/controllers/application_controller.rb class ApplicationController < ActionController::Base protected def force_trailing_slash redirect_to

问题 The sql statement is like this: select posts.id, posts.title from posts inner join (select distinct post_id,created_at from comments order by created_at DESC limit 5 ) as foo on posts.id=foo.post_id order by foo.created_at DESC; I want to get a rails 3 sql statement equivalent to the above one. What i tried is given below: The following sql query gives similar result. select distinct post_id, created_at from comments order by created_at DESC limit 5 @temp = Comment.select('distinct(comments

问题 So I have a module "MiddleMan" I am able to call it just fine in the rails console but in the controller I am getting a NoMethodError In the controller I have: class SignUpController < ApplicationController include MiddleMan def page_one @package = MiddleMan::read_catalog("a", "b", "c") end end And in the middleman.rb module I have: module MiddleMan def read_catalog(package, payment, coupon) Package.new(:price => "4.99") end end Any thoughts? 回答1: Since you included the module the instance