I was trying to install rails on Ubuntu Natty Narwhal 11.04, using ruby1.9.1. I installed ruby using apt-get install ruby1.9.1-full which contains the dev package. I googled the error and all have suggested I install the 1.9.1-dev which I already have. Building native extensions. This could take a while… ERROR: Error installing rails: ERROR: Failed … Read more
After I did brew update and brew upgrade, my postgres got some problem. I tried to uninstall postgres and install it again, but it didn’t work as well. This is the error message. (I also got this error message when I try to do rake db:migrate) $ psql psql: could not connect to server: No … Read more
As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for … Read more
I’ve recently started programming in Ruby, and I am looking at exception handling. I was wondering if ensure was the Ruby equivalent of finally in C#? Should I have: file = File.open(“myFile.txt”, “w”) begin file << “#{content} \n” rescue #handle the error here ensure file.close unless file.nil? end or should I do this? #store the … 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
The default Rails 4 project generator now creates the directory “concerns” under controllers and models. I have found some explanations about how to use routing concerns, but nothing about controllers or models. I am pretty sure it has to do with the current “DCI trend” in the community and would like to give it a … Read more
The difference between rake db:migrate and rake db:reset is pretty clear to me. The thing which I don’t understand is how rake db:schema:load is different from the former two. Just to be sure that I am on the same page: rake db:migrate – Runs the migrations which haven’t been run yet. rake db:reset – Clears … Read more
What’s the syntax for dropping a database table column through a Rails migration? 23 s 23 remove_column :table_name, :column_name For instance: remove_column :users, :hobby would remove the hobby Column from the users table.
I would like my JSON output in Ruby on Rails to be “pretty” or nicely formatted. Right now, I call to_json and my JSON is all on one line. At times this can be difficult to see if there is a problem in the JSON output stream. Is there way to configure to make my … Read more
