I am following Michael Hartl's RoR toturial and there are multiple places where he uses IRB, often to add users to the database. When I use rails console to open IRB and then create a User in the database everything works fine, but if I try to do the same thing by running the same line of code from a file like test.rb in the directory of my application it doesn't work b/c it says it can't find the User model. Is there any way I can run these lines of code (i.e. for putting a user into a database) from a .rb file rather than from the IRB?
For a separate script look into rails runner. It loads the Rails backend so you have access to all the models and exists for this purpose.
From the "Ruby on Rails Guides":
runner runs Ruby code in the context of Rails non-interactively. For instance:
$ rails runner "Model.long_running_method"
If you're just using test.rb as a convenience to save and re-run console commands, you could do this:
rails console < test.rb
Or, as a bit of a hack, put this at the top of your test.rb:
require 'config/environment'
And invoke it from the app's root directory like this:
ruby -I . test.rb
Placing a ruby file in the folder of your app doesn't automatically load up your Rails app. You need to explicitly load the config/environment.rb file to load the Rails app.
If your test.rb is in the root of your app, you can do something like
require File.expand_path("../config/environment", __FILE__)
# Access your models here
Related
I'd like to automatically run Dotenv.load('.env.development') whenever I launch up a ruby console, it could either be from bundle console or alternatively irb. I'm using Sinatra, not Rails, and I'm not sure how to run some commands on console start.. I'd prefer to do this without a bash script, instead using the internal capabilities of the tools.. If there's a place to put ruby code on the start of a ruby console that would solve my issue and also allow for future console customization.
You can create a .irbrc file in our project's directory which is loaded automatically when an IRB session is started. And add something like this to that file:
begin
require 'dotenv'
Dotenv.load('.env.development')
rescue => e
puts "loading Dotenv failed. because: #{e.message}"
end
Read more about the .irbrc file in the Ruby-Docs.
You try folliwing the documentation of gem(sorry my ignorance I don't know anything about sinatra)?:
Documentation dotenv
Install the gem:
$ gem install dotenv
By default, load will look for a file called .env in the current working directory. Pass in multiple files and they will be loaded in order. The first value set for a variable will win.
require 'dotenv'
Dotenv.load('file1.env', 'file2.env')
In your case i think should be:
require 'dotenv'
Dotenv.load('.env.development')
In ruby vanilla I dont know if possible, I think yes.
One option is to creating a ./bin/console script ala Bundler's gem.
I created this bin/console file as a temporary solution, but I'm curious whether I can get #spickermann's answer (which I incorporated here) with irbrc to work with a same-directory .irbrc
#!/usr/bin/env ruby
begin
require 'dotenv'
Dotenv.load('.env.development')
rescue => e
puts "loading Dotenv failed. because: #{e.message}"
end
require "irb"
IRB.start(__FILE__)
According to output from "rails" command, there is "rails application" command. When I use it I see the output from "rails new" command.
...
Description:
The 'rails new' command creates a new Rails application with a default
directory structure and configuration at the path you specify.
You can specify extra command-line arguments to be used every time
'rails new' runs in the .railsrc configuration file in your home directory.
Note that the arguments specified in the .railsrc file don't affect the
defaults values shown above in this help message.
Example:
rails new ~/Code/Ruby/weblog
This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
See the README in the newly created application to get going.
Mb I`m doing something wrong? Or these commands do the same?
Sorry for my bad writing.
rails application is not a valid command.
The rails command line tool will print out the man page if an invalid command is given. Most command line tools do the same.
Run rails nonexistent_command and it will print out the man page.
If outside of a rails app, it will print the man page for rails new. If inside a rails app dir, it will print out the other possible commands. e.g rails generate, rails console, etc.
i wanna make a simple ruby App Engine in rails just like heroku, i'm dealing with a problem now.
My idea was:
1.use rails to establish the App Engine, use a class 'App' to handle all apps.
2.when a user create an ruby app he should offer it's git path
3.when the user deploys it, my app engine will do these things:
clone the git to a path in my server (done
use RVM to designatine the ruby version witch user wanted and make a gemdir for the project (some problems here
create a nginx conf for the project, then include it and reload nginx (i can do it
Problems in the second step:
codes here:
def start_thin
Dir.chdir(proj_path) do
system('rvm use ruby-1.8.7-p352#testname --create')
system('gem env gemdir')
success = system ('thin start -s3 --socket ' + self.proj_sock)
if success
return true
end
end
return false
end
when the code runs here, the log told me "RVM is not a function...blahblah", i know something about the login-shell and non-login-shell, then i try to fix it via editing .bashrc but same problem occurred.
And if i ignore it, the app can't be deployed, because of a Load Error :
myapp.rb:2:in `require': cannot load such file -- sinatra (LoadError)
if i open a terminal in that app directory, i can use thin to start it.
i wanna know how to run cmd just like in a terminal, without all these odd problem?
or how to edit my method to fix it?
Thanks!
Thanks Casper and GhostRider.
The user and rvm settings are correct.
After lots of googles and tests i found it's impossible...
Finally I fixed it by using RVM's ruby api instead of running system command.
Such as :
require 'rvm'
env = RVM.current
env.gemset.create('app1')
I have a script called query.rb in my lib directory. I want to require it so I can run it from the Rails console. I wonder if this is possible. The script work fine from within the application, so I know it's well formed and functional.
For Rails 3+, use load "#{Rails.root}/lib/your_lib_file.rb"
load works like require, but allows you to re-load files as you edit them (unlike require, which you cant run again). See https://stackoverflow.com/a/6361502/513739
require "#{RAILS_ROOT}/lib/query"
For Rails 4+:
require "#{Rails.root}/lib/query"
>> $:.unshift 'lib'
>> require 'query'
say I've got my rails app on github and am deploying the github repo on heroku.
I've got a situation where I have a simple text file with bunch of words (it is in my github repo). I want to insert these words (using a simple ruby program) into a database. Instead of using the tap command, is it possible in heroku to just run my simple ruby program and insert the words into the database...or maybe just show them on the terminal?
maybe confusing but basically I want to know how to run simple ruby script from heroku command line?
With cedar, you can run bash:
heroku run bash
Put your ruby script in a bin directory and git push it to Heroku. Now you can execute a shell command in the heroku console.
For example, if your Ruby script is bin/foo.rb, you can run the following command in the Heroku console:
`ruby bin/foo.rb`
Note the use of backticks.
Since you're talking about a Rails app on Heroku, how about using rails runner:
heroku run bundle exec rails runner ./path/to/script.rb -a <your-app>
Have a look at the RailsGuides for rails runner for more details.
Alternatively, turn that script into a rake task if runner is not your cup of tea (eg, for recurring tasks).
cd /path/to/my/local/repository
heroku console
require 'my_word_importing_script'
Failing that, try a simple Sinatra application as importer.rb?
require 'sinatra'
require 'sequel'
configure do
// connect to the database with sequel
end
get '/import/a-long-unguessable-url-fdsjklgfuiwfnjfkdsklfds' do
words = YAML.load(File.join(File.dirname(__FILE__), "my_list_of_words.yaml"))
words.each do |word|
// Your logic for inserting into the database with sequel
end
end
Hitting http://example.com/import/a-long-unguessable-url-fdsjklgfuiwfnjfkdsklfds in your browser would kick off the import. Handy for an external cron task.
You would also need a config.ru file in the repo:
require 'importer'
run Sinatra::Application
If you want to run arbitrary local Ruby files on Heroku, check out the blog post at
http://www.22ideastreet.com/debug/run-local-scripts-on-heroku
There are some things to watch out for (long run times, etc.) but it might be useful if you have a file that you haven't checked in that you want to test or run on a Heroku instance.