ruby-on-rails-3.1

问题 I'm trying to use the mysql2 gem with rails 3.1.0.rc6, but I'm having some problem with my mysql client. I'm getting this message when trying to start my server. Incorrect MySQL client library version! This gem was compiled for 5.1.53 but the client library is 5.5.14. (RuntimeError) How do I compile/install mysql2 so that is can use mysql 5.5.14? I've tried using gem pristine mysql2 without success. 回答1: The problem here was that the MySQL2 gem was compiled for the MySQL version installed by

问题 I recently updated my Rails to 3.1. Here's a part where I added: <%= asset_path('logo_symbol.png') %> This renders /assets/logo_symbol.png which works perfectly fine in development environment. However, when i push the code to production on heroku, it shows a broken image, with the url: assets/logo_symbol-135ddc8db2c9b59f032bed7db520137a.png . I am guessing the new name is for the reason of some optimization. It is however interesting to note that when I go to the assets/logo_symbol

问题 Just started to adapted to rails 3.1, I started to write coffeescript and sass and everything works fine in development. When I run the server in production, I only get: <link href="/stylesheets/application.css" media="screen" rel="stylesheet" type="text/css" /> <script src="/javascripts/application.js" type="text/javascript"></script> in the source code of the page, there's no hashcode generated and both assets has routing errors: Routing Error No route matches [GET] "/stylesheets

问题 I have VirtualBox with Ubuntu 11.10 on Windows7. I run Rails 3.1 on webrick (rails s) and go to VirtualBox's IP adress (192.168.2.xxx:3000) from browser on Windows. At this moment I face troubles - page loads very very slowly, on Rails console i see how slowly it responses files (css, js, images): up to 5 seconds for each! But: if I go 0.0.0.0:3000 inside Ubuntu - it works perfect. Where is the problem? Where to look for a solution? 回答1: As mentioned above, it appears this is a duplicate of

问题 I am getting the following error frequently in my application. If I restart my rails application this error will not appear for some time. Rails - 3.1.3 Ruby - 1.9.3 ActiveRecord::StatementInvalid: PG::Error: ERROR: null value in column "id" violates not-null constraint Directory.create(:name=>"name",:alias_name=>"name",:site_id=>2,:type=>"Directory") (0.3ms) BEGIN SQL (0.8ms) INSERT INTO "databases" ("alias_name", "created_at", "created_by", "id", "name", "site_id", "type", "updated_at",

问题 If I don't handle view correctly, Production environment show 500. <%= image_tag post.user.image_url %> This could be <%= image_tag post.user.image_url if post.user && post.user.image_url %> but I am little careless and forgot this issue several times. How can I prevent this? How can I use <%= image_tag nil %> in production environment without raising 500? 回答1: image_tag must have a source, Rails can do nothing with it, but raise an exception. You can write a helper like this: module

问题 If I don't handle view correctly, Production environment show 500. <%= image_tag post.user.image_url %> This could be <%= image_tag post.user.image_url if post.user && post.user.image_url %> but I am little careless and forgot this issue several times. How can I prevent this? How can I use <%= image_tag nil %> in production environment without raising 500? 回答1: image_tag must have a source, Rails can do nothing with it, but raise an exception. You can write a helper like this: module

问题 After reading about attr_accessible in the Rails 3.1 API, I see that there is an as :admin option in there. I would like to know two things. If the user has an admin flag, how do does my controller tell my model that the user is an admin. If the user is an owner, can i specify :as => owner in my model, and once again how does my controller inform my model they are the owner of an item. 回答1: There is no built-in integration with models; you pass in the role in the assign_attributes call:

问题 Active Admin is a gem used for having an admin dashboard in your application. It uses Devise for logging in users and creates a separate admin_user model for the admins. My application already uses devise and has its users as the user model. Ever since I started using the active admin gem, in my routes file the following line keeps resolving to home#index and not users#dashboard even when my user is logged in. This used to work fine earlier where logged in users were taken to users#dashboard

问题 I am working on a rails app. Installed Postgresql using postgresql-9.1.2-1-osx.dmg Installed pg gem. Then when I executed rake db:create getting the following error - dlopen(/Users/sathishvc/.rvm/gems/ruby-1.9.3-head@knome-vivacious/gems/pg-0.12.2/lib/pg_ext.bundle, 9): Library not loaded: /usr/local/lib/libpq.5.4.dylib Checked if /usr/local/lib/libpq.5.4.dylib exists or not. It does not. So, it should be existing somewhere else in the system or I do not know, if I need to install any other