I want to delete all the files it created and roll back any changes made, but not necessarily to the database, but more to the config files. I’d like to automatically delete all the resource mappings for the model/controller deleted in the routes.rb file and everywhere else that changes might have been made? 17 s … Read more
I added a table that I thought I was going to need, but now no longer plan on using it. How should I remove that table? I’ve already run migrations, so the table is in my database. I figure rails generate migration should be able to handle this, but I haven’t figured out how yet. … Read more
I have a dev Ruby on Rails database full of data. I want to delete everything and rebuild the database. I’m thinking of using something like: rake db:recreate Is this possible? 2Best Answer 21 I know two ways to do this: This will reset your database and reload your current schema with all: rake db:reset … Read more
To add a new pair to Hash I do: {:a => 1, :b => 2}.merge!({:c => 3}) #=> {:a => 1, :b => 2, :c => 3} Is there a similar way to delete a key from Hash ? This works: {:a => 1, :b => 2}.reject! { |k| k == :a } #=> {:b … Read more
How do I generate a random number between 0 and n? 17 s 17 Use rand(range) From Ruby Random Numbers: If you needed a random integer to simulate a roll of a six-sided die, you’d use: 1 + rand(6). A roll in craps could be simulated with 2 + rand(6) + rand(6). Finally, if you … Read more
I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error: $ gem install pg Building native extensions. This could take a while… ERROR: Error installing pg: ERROR: Failed to build gem native extension. /home/u/.rvm/rubies/ruby-1.9.2-p0/bin/ruby extconf.rb checking … Read more
I wrongly named a column hased_password instead of hashed_password. How do I update the database schema, using migration to rename this column? 3 31
