I know two ways to do this: This will reset your database and reload your current schema with all: This will destroy your db and then create it and then migrate your current schema: All data will be lost in both scenarios.
NOTE: For a concise and efficient solution, please see Marc-André Lafortune’s answer below. This answer was originally offered as an alternative to approaches using flatten, which were the most highly upvoted at the time of writing. I should have clarified that I didn’t intend to present this example as a best practice or an efficient … Read more
This is because you haven’t set your secret key correctly. Double check your config/secrets.yml file: It should be something like this: production: secret_key_base: <%= ENV[“SECRET_KEY_BASE”] %> Then in your droplet, you can run bundle exec rake secret to get your secret key. There are options like dotenv which is a useful gem that loads the … Read more
There’s no difference, in fact map is implemented in C as rb_ary_collect and enum_collect (eg. there is a difference between map on an array and on any other enum, but no difference between map and collect). Why do both map and collect exist in Ruby? The map function has many naming conventions in different languages. Wikipedia provides an overview: The map function originated in functional programming languages but is today supported (or may be … Read more
to_sym converts a string to a symbol. For example, “a”.to_sym becomes :a. It’s not specific to Rails; vanilla Ruby has it as well. It looks like in some versions of Ruby, a symbol could be converted to and from a Fixnum as well. But irb from Ruby 1.9.2-p0, from ruby-lang.org, doesn’t allow that unless you add your own to_sym method to Fixnum. I’m … Read more
Yes, it’s called next. This outputs the following:
In order: pid: The is the process ID (PID) of the process you call the Process.pid method in. ppid: The PID of the parent process (the process that spawned the current one). For example, if you run ruby test.rb in a bash shell, PPID in that process would be the PID of Bash. uid: The UNIX ID of the … Read more
This will iterate through all the elements: Prints: This will iterate through all the elements giving you the value and the index: Prints: I’m not quite sure from your question which one you are looking for.
It’s easy; just do the following: or And don’t forget to remove the script calls in the following files: ~/.bashrc ~/.bash_profile ~/.profile And maybe others depending on whatever shell you’re using.