Rails select helper – Default selected value, how?
This should do it: <%= f.select :project_id, @project_select, :selected => params[:pid] %>
ruby-on-rails
Converting string from snake_case to CamelCase in Ruby
If you’re using Rails, String#camelize is what you’re looking for. “active_record”.camelize # => “ActiveRecord” “active_record”.camelize(:lower) # => “activeRecord” If you want to get an actual class, you should use String#constantize on top of that. “app_user”.camelize.constantize
Change a Rails application to production
This would now be rails server -e production Or, more compact rails s -e production It works for rails 3+ projects.
Error installing libv8: ERROR: Failed to build gem native extension
try this one: gem install libv8 -v ‘3.16.14.3’ — –with-system-v8 Note : Because libv8 is the interface for the V8 engine used by therubyracer, you may need to use libv8, even if you have V8 installed already. If you wish to use your own V8 installation, rather than have it built for you, use the … Read more
execJs: ‘Could not find a JavaScript runtime’ but execjs AND therubyracer are in Gemfile
Ubuntu Users: I had the same problem and I fixed it by installing nodejson my system independent of the gem. on ubuntu its: sudo apt-get install nodejs I’m using 64bit ubuntu 11.10 update: From @Galina ‘s answer below I’m guessing that the latest version of nodejs is required, so @steve98177 your best option on a … Read more
Ruby on Rails Callback, what is difference between :before_save and :before_create?
In a create operation under Rails, there are six callbacks before the database operation, and two after. In order, these are: before_validation before_validation_on_create after_validation after_validation_on_create before_save before_create DATABASE INSERT after_create after_save Update operations have exactly the same set, except read update instead of create everywhere (and UPDATE instead of INSERT). From this, you can see … Read more
How to redirect to previous page in Ruby On Rails?
In your edit action, store the requesting url in the session hash, which is available across multiple requests: session[:return_to] ||= request.referer Then redirect to it in your update action, after a successful save: redirect_to session.delete(:return_to)
Combine two ActiveRecord::Relation objects
If you want to combine using AND (intersection), use merge: first_name_relation.merge(last_name_relation) If you want to combine using OR (union), use or†: first_name_relation.or(last_name_relation) † Only in ActiveRecord 5+; for 4.2 install the where-or backport.
What is the right way to override a setter method in Ruby on Rails?
=========================================================================== Update: July 19, 2017 Now the Rails documentation is also suggesting to use super like this: class Model < ActiveRecord::Base def attribute_name=(value) # custom actions ### super(value) end end =========================================================================== Original Answer If you want to override the setter methods for columns of a table while accessing through models, this is the way to … Read more
Rails: Installing PG gem on OS X – failure to build native extension
Same error for me and I didn’t experience it until I downloaded OS X 10.9 (Mavericks). Sigh, another OS upgrade headache. Here’s how I fixed it (with homebrew): Install another build of Xcode Tools (typing brew update in the terminal will prompt you to update the Xcode build tools) brew update brew install postgresql After … Read more