ruby-on-rails-3

问题 I have article model and i want to show a notification such as a flash message on the home page to the users when they log in or who is logged in already when a new article is posted using private_pub gem articles_controller.rb class ArticlesController < ApplicationController def index @articles = Article.all @articles_grid = initialize_grid(Article, :include => [:user]) end def show @article = Article.find(params[:id]) @comment = Comment.new end def new @article = Article.new end def create

问题 I have a model Grade and a model User. Between grades and user is a many-to-many association through collaborations. in user.rb has_many :grades, through: :collaborations, source: :user works, but i need to get only grades with attribute "archived" = false i tryied has_many :grades, through: :collaborations, source: :user, conditions: [' archived = ? ', false] but it takes all the grades, in other words, the condition is ignored. I can put in my collaborations this condition, but

问题 I'm just starting out with rails and I'm practicing the basic ruby commands, one of which is the rails new myproject command. My projects are under the Aptana workspace directory where I've used the command line and Aptana both to create projects there. After a few creations and rails s commands and deletions, I've started getting this error message when I try to generate a new rails project: "Can't initialize a new Rails application within the directory of another, please Type 'rails' for

问题 I am using the Ancestry Gem and I am getting an undefined method "arrange" for #<Array:0x007f8d58e58700> error with the following code: <%= @shipmgr_carriers.arrange(:order => :name) %> However, When I just output @shipmgr_carriers I get an array with ancestry: [#<Shipmgr::Carrier id: 9, name: "testing", status: nil, created_at: "2012-01-16 22:44:28", updated_at: "2012-01-16 22:44:28", ancestry: nil>, #<Shipmgr::Carrier id: 10, name: "test", status: nil, created_at: "2012-01-16 22:44:28",

问题 I am using the Ancestry Gem and I am getting an undefined method "arrange" for #<Array:0x007f8d58e58700> error with the following code: <%= @shipmgr_carriers.arrange(:order => :name) %> However, When I just output @shipmgr_carriers I get an array with ancestry: [#<Shipmgr::Carrier id: 9, name: "testing", status: nil, created_at: "2012-01-16 22:44:28", updated_at: "2012-01-16 22:44:28", ancestry: nil>, #<Shipmgr::Carrier id: 10, name: "test", status: nil, created_at: "2012-01-16 22:44:28",

问题 I have a rails app with a Location model, which has a rating , and a rating_count field. Now, I need to reset every Location 's rating and rating_count attributes to 0 at a specific time everyday, lets say 12:00:00 UTC. How would I accomplish this? I'm using the default sqlite3 databases. 回答1: The best option is to use cron. You can find tons of documentation out there!Although if you are running a Rails app you should check out whenever a pretty neat gem for managing cron jobs for your app!

问题 I want to concatenate a few links with a pipe. But all links are surrounded by an if-statement. Example: - if condition1 = link_to link1 - if condition2 = link_to link2 - if condition3 = link_to link3 If condition 1 and 2 are true, the result should be link1 | link2 Any hints how to do this? 回答1: I would use smth like that for that purpose: = [[l1, c1], [l2, c2], [l3, c3]].map{ |l, c| link_to(l) if c }.compact.join('|') or = [(link_to(l1) if c1),(link_to(l2) if c2),(link_to(l3) if c3)]

问题 To perform a range query we follow something akin to the syntax below -: oms[:order_items].where(:internal_sla => 3..5) results in this query => #<Sequel::Mysql2::Dataset: "SELECT * FROM `order_items` WHERE ((`internal_sla` >= 3) AND (`internal_sla` <= 5))"> But how can I change the active record query to give me something like this => select internal_sla from order_items where (internal_sla<=3 and internal_sla>=0) OR (internal_sla<=15 and internal_sla>=10) 回答1: .where("(internal_sla >= ? AND

问题 The following code used to function without attempting to render a new template with jQuery verion 1.6. I installed jQuery 1.6.1 and now a radio button click results in an attempt to render a new page. FYI, the form was submitted on each click because quite a few clients would complete part of the questions, close the browser and expect their work to be there when they came back to finish. If there is a better way, I'd love to know it. in the application.js on development machine: $('

问题 ok so I am trying to display a users microposts in two different places based on a hidden_tag_field that is a column in the database called kind. This kind is either "purchase" or "micropost". The app/views/users/show.html.erb (where I want both lists to be displayed) <section> <div id= "purchases"> <%= render 'shared/micropost_form_purchase' %> <div class="row"> <div class="span8"> <% if @user.microposts.any? %> <ol class="microposts"> <%= render @purchases %> </ol> <% end %> </div> </div> <