So today I've been working with RoR for the first time using the book 'Rails for PHP developers'. I'm following the tutorial in there.
I created a project, with a model Subscriber and a controller Subscribers, which has a method create. Then I ran ruby script/server to launch Mongrel.
Now, the book says that if I go to http://localhost:3000/subscribers/create I should get an error because there's no template associated (yet) for this action. The book shows this error message:
Template missing
Missing template subscribers/create.html.erb in view path /Users/derek/work/newsletter/app/views
A nice descriptive error message, really helpful. But the error I get is:
We're sorry, but something went wrong.
We've been notified about this issue and we'll take a look at it shortly.
That error is not helpful at all. I suspect it has to do with the fact that the book uses WEBrick, and I use Mongrel. But I assume it should be possible to get more descriptive errors, right? It seems quite painful to develop with errors like this.
It looks like some of your Rails install is semi borked. You might be missing the mysql gem or might not have the mysql ActiveRecord adaptor configured correctly.
Use gem list to see the gems you have installed
$ sudo gem list
you can use the gem install command to install or update gems
$ sudo gem install rails mysql
You usually want to install gems with sudo (as root) so all users can use them ( like apache or www-data)
Im sorry your first try at Rails hasn't gone smoothly, trust me it is an extremely powerful framework. Strick with it!
You probably forgot to setup the database. You can check log/development.log for further details.
you only get the first message if you are running in development mode.
Related
I've been following Mike Hartl's excellent Ruby on Rails Tutorial`.
I had to make some decisions earlier about versions for gem files and ruby. I decided (after some problems getting Heroku to work that I'd directly mimic the tutorial and versions of ruby described - leading me to go with rvm use 2.0.0 to set my version of ruby.
All was great on chapter one but now I'm getting an error message when i try to create a new rails project:
$ rails new demo_app
/home/huw/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- rails/cli (LoadError)
from /home/huw/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /usr/bin/rails:9:in `'
I have no idea what that means... but as its referencing my ruby version I'm guessing that my rails and ruby versions are out of sync...
Could someone advise on possible courses of action?
I imagine possible options would be:
Reset my ruby version to the latest (but I don't know what clashes
that would create with gems!)
Downgrade from rails 4.1 to rails 4 (I believe that's Mike Hardl's version)
Force things through somehow
I'm a complete rails Noob however, and have no idea where to begin on any of those options - or if that error code even backs up my assumptions!
Forgive the "answer" but I don't have the rep to post a mere comment :-(
Have you tried looking at the RVM site? It has a troubleshooting page that may help you.
If not, have you tried get rvm stable and then typing in the rails new app_name command?
Other useful RVM commands are rvm list rubies and rvm gemset list. It may be the case that the ruby version you're using doesn't have rails for some reason.
As per zwippie's answer in the comment section, the solution was achieved as follows.
rails -v produced a very similar looking output to the error message above.
gem install rails after hanging for a second installed rails successfully. I am now able to add a new project.
I'm unsure why this has happened as I've been successfully making new rails projects both on this laptop and in this directory for the last two weeks, even up until this morning. However as zwippie notes perhaps this is an RVM setup issue. I'll go away and read up but if anyone had any additional pointers from documentation that might shed light on the issue I'm appreciate any links in the comment.
Many thanks all.
check for the rails is installed on your machine by the command bundle show rails.
If you get the version of rails and are still getting the above error, to resolve it you may have to use the command bundle exec before every rails command as in bundle exec rails s.
This is a follow up to an earlier quesiton. I just installed Ruby on Rails using the rails installer (www.railsinstaller.org) but when I try to run any commants be it gem -v or rails new sample I get an error message saying:
Failed to load C:/Users/Zack/.gemrc due to permissions problem.
ANY ideas what to do would be very much appreciated. (Note that this is all being run on windows 7).
Was this just the only error you received in the console? Also have you checked if this file exists in the directory it is pointing to. if so what is in it. If you happen something like the following in the .gemrc you should have something like the following:
"gem": "--no-ri --no-rdoc"
This should work, providing this file exists. This can be caused when you installed Ruby using admin and then the file is created. For supported information check the following SO question this may also support you Ruby gem listed, but wont load
Probably there are two files .gemrc like in C:/Users/Zack/.gemrc and C:/ProgramData/gemrc/.gemrc. Verify and delete this last.
I'm learning rails with "agile web development with rails (3rd edition)" and I've gotten to the point where I'm supposed to make the depot app.
I have created the depot app, and I've added the script/generate files. I've raked the db. For some reason, no tables where created in the migration and upon running this command:
depot> sqlite3 db/development.sqlite3 "select version from schema_migrations"
I get nothing. Then when running localhost in my browser, instead of getting what I'm supposed to, I get the standard welcome to rails page.
Any advice?
Resolved:
It's always the simple things. Had to direct to localhost:3000/products instead of just to localhost:3000 - wasn't aware of this. Thanks!
There is a number of possibilities here, firstly, judging by the fact you can see the standard "Welcome to Rails" page you haven't deleted public/index.html - you should do this so that Rails can route to the root /
Secondly, if your migrations are running correctly you should have a schema.rb file in ./db with the instructions for each table, if not then something is failing there.
I have not read the 'Agile web development with Rails" book but I am assuming it was written before the release of Rails 3, which means your app does not use Bundler for gem dependency management so it might be worth checking that sqlite3 gem is installed. You can check this with gem list sqlite if you don't see something like "sqlite3-ruby (1.3.2)" then you need to install it.
Lastly, check the log files in ./log/
Well I guess you've created multiple migrations by now so try typing rake db:migrate at the command line and let use know what it says?
I am new to Ruby on Rails and am following a tutorial to create a class project.
I can generate a new rails project with
$ rails project
The problem Im having is when I try to start my server, It will generate a project called server:
$ rails server
or
$ rails s
I figured out that I need to install/update rails to 3.0.3 to use this command every time I open terminal. I find myself having to install gems(bundle, etc) every time I need to work on my project.
Is there anyway to save this terminal session or profile for later use?
Is it user error?
Im new to Rails and about the same with terminal.
Any help would be greatly appreciated. I have resorted to leaving my computer and terminal open for about a week...
Welcome on board! - You'll have fun, I found setting up the environment the most difficult thing.
in rails 2 you start the server with ruby script/server.
to upgrade to rails 3 try gem install rails -v=3.0.4
I put the version but it's not a mandatory option.
To uninstall a gem (as rails is) is gem uninstall gemname -v=x.x.x. -
gem list will tell you the version of each gem.
I hope you've got rvm, if not I strongly sugget you to install it, this will allow you not only to use different versions of ruby but also to set different gemsets, therefor one each project, you'll find it useful.
Once in rails 3 you can use bundler, have a look at this episode of railscasts, by the way this is a very good site, but you may know it already.
another edit...
I don't know the behavior you're describing, looks like something is wrong with your environment, but I need to know if you have rvm to solve this, if so try rvm list and rvm gemset, With the first you get the list of installed ruby, you can switch between them with rvm 1.9.2 i.e. and rvm 1.9.2#gemdirname with the gemdir coming from the second list. You should find your configuration in one of those list.
Hi if you are using rails 2.8 or lesser use this to start the server
ruby script/server
rails new project is for new rails project n rails s is for starting server
Having the same problems as this post, except I don't think the solution is the same unfortunately.
I'm getting this error message:
Rails requires RubyGems >= 0.9.4. Please install RubyGems
when I run a script/runner job in Cron, but it works perfectly fine when I run it in a terminal on the same server.
The rails server also runs fine. I only have trouble running script/runner's in cron. It seems to want to have a terminal attached...
Try which ruby and which gem from your cron job and also from the terminal. Are you accessing different binaries? You didn't mention which OS and which shell, but you may have a different $PATH when running headless.
The selected answer is completely correct, but something I'd suggest is to NOT use script/runner. The resources required to load the entire stack of your rails application is pretty intense for something to run regularly.
In my past experience, any cron jobs generally only have to deal with data (as opposed to say, generate static files, etc). In this case, you can very simply just load your models up, and since you've written your models the correct way (fat models), you can easily do your data processing with a few model methods.
Of course, all the above depends completely on your task, so take it with a grain of salt :)
I suppose this was a sort of answer to a problem that may not exist, and wasn't asked here, but just thought I'd throw my two cents in ;)
You wouldn't happen to be working on OSX? You should be installing a newer ruby rails and gems off macports instead. Google for the instructions...
As indicated by earlier posts, your Cron is using a different gem command source — also try which gem and gem -v. You may have a library set in your .bash_profile (or similar shell configuration or perhaps by other means, setting proper Ruby/Rails environment (i.e., Locomotive or other all-in-one environment).
To update your gem setup:
gem update --system
More information here - http://www.rubygems.org/read/book/1